Shenzhen Canrill Technologies Co., Ltd

How to Choose the Right Industrial Cameras Lens(2024年04月16日)

canrilloptics — 2024-04-16T12:01:31+0900

https://www.canrilloptics.com/what-should-i-pay-attention-to-when-choosing-an-industrial-camera-lens.html

As a critical component of the machine vision system, the industrial camera is usually installed on the machine assembly line to replace human eyes to do measurement and judgment. Thus, choosing the right camera lens is also an essential part of machine vision system design. How should we choose the right industrial camera lens? What problems should be paid attention to when choosing an industrial camera lens? Let's learn about it.

Basic Consideration Regarding Choosing Industrial Cameras Lens

Choosing CCD or CMOS camera according to different applications

The CCD industrial cameras lens is mainly used in the image extraction of moving objects. Of course, with CMOS technology development, the CMOS industrial camera is also applied for many chip mounters. The CCD industrial camera is widely used in vision automatic inspection. CMOS industrial cameras are widely used because of their low cost and low power consumption.

Resolution of industrial cameras lens

Firstly, by considering the object's accuracy to be observed or measured to select the resolution accordingly. If camera pixel accuracy = single direction field of view size/camera single direction resolution, then the camera's resolution in one direction = the size of the field of view in one direction / the theoretical accuracy.

If the single field of view is 5mm and the theoretical accuracy is 0.02mm, the single direction resolution is 5 / 0.02 = 250. However, to increase the stability of the system, not only one-pixel unit is used to correspond to one measurement/observation accuracy value. Generally, multiple four or higher can be selected. In this way, the camera needs a single direction resolution of 1000 and 1.3 million pixels.

Secondly, considering an industrial camera's output, high resolution is helpful for posture observation or machine software analysis and recognition. If it is the VGA or USB output, It should be observed on display; thus, it also depends on the resolution of the display. No matter how high the resolution of an industrial camera lens with industrial vision technology is, it isn't very meaningful if the resolution of the display is not enough. If you use the memory card or the photo-taking function, the high resolution of an industrial camera also helps.

Camera frame number of industrial cameras lens

When the measured object is moving, the industrial camera lens selection with high frame number should be selected. But generally speaking, the higher the resolution, the lower the number of frames.

The match of the industrial lens

The size of the sensor chip should be less than or equal to the lens size, and the C or CS-mount should also match.

Additional Considerations over Choosing the Right Camera Lens

C interface or CS interface. The interface distance of the C interface is 17.5mm, while that of the CS interface is 12.5mm. Only the right interface could lead to focus.

Choosing a camera lens should also consider the size of the photosensitive device. For a 2/3-inch photosensitive chip, the industrial cameras lens corresponding to the imaging coil should be selected. If 1/3"or 1/2" is selected, there will be a large dark angle.

Select the focal length; that is, select the industrial lens whose field of view is slightly larger than the observation range.

Depth of field and light environment should match. For areas with enough light or light source illumination, a small aperture can be chosen to increase the depth of field, thereby improving the shooting clarity. Where there is not enough light, a slightly larger aperture or a sensitive chip with high sensitivity would be selected.

Current Trends over Industrial Cameras Lens Choices
For choosing the right camera lens, here are several popular trends nowadays.

Firstly, image sensors have made great strides in recent years. The trend is to have more and more pixels for better resolution of industrial cameras lens, as well as a greater sensitivity (backlight image sensor).

What's more, the CCD technology becomes more efficient and now shares more and more features with CMOS technology sensors.

In terms of communication interfaces, they transmit data faster and faster. The trend over the next few years will be to transmit data wirelessly, namely using Wifi.

As a lens manufacturer, we can provide kinds of object space telecentric lens for sale, if you want to buy anything, please contact us.

What is an Industrial Inspection Lens?(2024年04月16日)

canrilloptics — 2024-04-16T12:00:35+0900

https://www.canrilloptics.com/what-is-a-telecentric-lens.html

Industrial lenses are very important imaging components in machine vision systems. For the system to fully perform its functions, industrial lenses must meet the requirements. At the beginning of the 21st century, with the widespread application of machine vision systems in the field of precision inspection, it is difficult for ordinary industrial lenses to meet the inspection requirements. To make up for the shortcomings of ordinary lens applications and meet the needs of precision inspection, telecentric lenses came into being.

Telecentric lens design is based on its unique optical characteristics: high resolution, ultra-wide depth of field, ultra-low distortion, and unique parallel light design, which brings a qualitative leap in precise machine vision inspection.

Ⅰ. Industrial Telecentric Lens Definition

Telecentric lens is mainly designed to correct the parallax of the traditional industry lens. It can be within a certain object distance range so that the image magnification will not change, which is suitable for the situation where the measured object is not on the same object surface. It is a very important application. Telecentric lenses have always been favored by machine vision applications that require high lens distortion due to their unique parallel optical path design.

Ⅱ. Types of Industry Inspection Lens

Generally, the industry lens with industrial vision technology consists of FA lens, Zoom lens and telecentric lens. When the inspected object has serval surfaces or has angles with lens, or the object is moved up and down, or requires high precision and low distortion, the machine vision telecentric lens will be required.

Ⅲ. Application Advantages Of Industrial Inspection Lens

The telecentric industry lens of the telecentric optical system is mainly used for precision measurement. In the precision optical measurement system, due to the ordinary optical lens, there will be certain constraints, such as image distortion, errors caused by the choice of viewing angle, and boundary uncertainty caused by improper light source interference, which will affect the accuracy of measurement. The industrial inspection telecentric lens can effectively reduce or even eliminate the above-mentioned problems. Therefore, the industrial inspection lens has become a decisive component of a precision optical measurement system, and its application fields are becoming more and more extensive.
Related Machine Vision Telecentric Lens Articles

Industrial Camera Lenses: Enhancing Vision in Manufacturing
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Visionary Agriculture: Enhancing Crop Inspection With Machine Vision Illuminators
Line Scan Lenses and Machine Vision: Revolutionizing Industries

If you are looking for a reliable optical lens manufacturer, please choose us, and we will be your best partner.

What Are the Specifications for the Light Source Part of Machine Vision?(2024年04月16日)

canrilloptics — 2024-04-16T12:00:01+0900

https://www.canrilloptics.com/what-are-the-specifications-for-the-light-source-part-of-machine-vision.html

1. Ring light source for machine vision

The ring light source provides different illumination viewpoints and different color combinations, which can better highlight the three-dimensional information of the object. It has the advantages of a high-density LED array, and high brightness. Various compact designs can save installation space and they can handle the problem of illuminating shadows diagonally. Diffusing plate for the light guide is optional, and the light is evenly dispersed.

2. Strip light source for machine vision

The strip light source is the preferred light source for the large measured object with a square structure, and the colors can be adjusted and combined freely according to the needs. The illumination viewpoint and the device can be adjusted at will.

3. Coaxial light source for machine vision

The CO coaxial light source can eliminate the shadow caused by the uneven surface of the object, thereby reducing the interference. Some use spectroscope design to reduce light loss, improve imaging clarity, and evenly illuminate the surface of objects.

4. Point light source for machine vision

It has the advantages of high-power LED, small size, and high luminous intensity. It is an alternative to fiber-optic halogen lamps, especially suitable as a coaxial light source for lenses, etc. It is an efficient heat dissipation device, which can greatly improve the service life of the light source.

5. Linear light source for machine vision

It has ultra-high brightness, which uses a cylindrical lens to condense light, and is suitable for various continuous detection occasions in assembly lines.

6. Four-sided adjustable light source for machine vision

The four-sided adjustable light source consists of four independently controllable lighting units, each of which is freely adjustable from 0 to 90 degrees, and the brightness can be controlled independently.

7. Surface light source for machine vision

Surface light source: LEDs are evenly distributed at the bottom of the light source after optical optimization planning, and a uniform illuminating light is formed on the surface via special dispersion materials.

8. Plane shadowless light source for machine vision

By using a common light guide method and optical dispersion design, soft, uniform and diffuse lighting can be performed on glossy objects.

9. Dome light source/sphere integral light led illumination for machine vision

High-brightness LEDs and a common illumination structure are selected, and the light emitted by the LEDs forms bright and uniform scattered light through the special diffuse reflection material in the spherical surface. The hemispherical inner wall with integral effect uniformly reflects the light emitted from the bottom 360 degrees, so that the illumination of the whole image is very uniform.

Founded in 2009, Shenzhen Canrill Technologies Co., Ltd is the first company in China to focus on the design, manufacture, and marketing of telecentric lenses. It is also the only company in China that has its own machinery factory and optical factory to build a complete supply chain for the entire industry of lenses. Over the years, Shenzhen Canrill Technologies Co., Ltd has upgraded its lenses for four generations with advanced technology and performance, won the trust of global customers, and successfully cooperated with world-renowned brands such as Samsung, Apple, LG, Huawei, Han's Laser, and TSMC. If you have any needs, please feel free to consult us.
Related Machine Vision Telecentric Lens Articles

Beyond Clear Sight: Optical Lens Manufacturers and Cutting-Edge Technology
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As a custom lens manufacturer, we will do our best to meet all the needs of customers.

What Are the Accessories of the Machine Vision System?(2024年04月16日)

canrilloptics — 2024-04-16T11:59:09+0900

https://www.canrilloptics.com/what-are-the-accessories-of-the-machine-vision-system.html

1. Image processing system of machine vision accessories
Optical text, recognition system, automation/robot technology, infrared image system.

2. Machine vision integration
Character processing and recognition system, automation/robot technology, infrared imaging system, tobacco, banknote printing, electronic assembly, quality inspection, automatic recognition (OCR/OCV), measurement, intelligent vision, surface inspection, printing, packaging, complex industrial object vision online, automobile manufacturing, license plate, biometric identification, medical testing, optical inspection and other systems.

3. Machine vision technology
Machine vision technology is a high-tech system that integrates modern computer, optics, and electronic technologies. Machine vision technology uses a computer to process the images taken by the system, analyze the information in it, and make corresponding judgments, and then issue control instructions to the device.

4. The specific application process of the machine vision system:
(1) Image acquisition uses a light source to illuminate the object or environment to be observed, acquires images through an optical imaging system, and converts optical images into digital images through cameras and image acquisition cards. This is the front end and information source of the machine vision system.

(2) Image processing and analysis. The computer processes the image through image processing software and analyzes and obtains useful information. For example, whether there is a circuit break in the image of the PCB board, whether there is a defect in the image of the textile, and what text is in the image of the document, etc. This is the core of the entire machine vision system.

(3) The machine vision program judges and controls the information obtained by image processing, and then uses it to judge the object (measured object, environment), and forms the corresponding control command, which is sent to the corresponding organization. For example, in the captured part image, calculate whether the size of the part is consistent with the standard, and if the part is inconsistent, an alarm will be issued, marking or rejection will be made.

In the whole process, the information of the measured object is reflected as image information, and then after analysis, the characteristic description information is obtained from it, and then judgments and actions are made according to the obtained characteristics.

A typical telecentric lens machine vision system generally includes: a light source, an optical imaging system, a camera, an image capture card, an image processing hardware platform, an image and visual information processing software, and a communication module.

In general, a successful machine vision solution needs to focus on the key technologies of image acquisition (including light source, optical imaging, digital image acquisition and transmission), image processing and analysis.

The machine vision optics system is a highly integrated system of opto-electromechanical computers, and its performance is not only determined by a certain link. Every link is perfect, and it does not necessarily mean that the final performance is satisfactory. System analysis and design is the difficulty and foundation of machine vision system development, and it is also something that many developers are not good at, and urgently need to be strengthened.
Related Machine Vision Telecentric Lens Articles

Through the Lens: Long Working Distance Applications in Archaeological Studies
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As a china lens manufacturer, we will do our best to meet all the needs of customers.

The Role of Light Sources in Machine Vision(2024年04月16日)

canrilloptics — 2024-04-16T11:58:17+0900

https://www.canrilloptics.com/the-role-of-light-sources-in-machine-vision.html

A complete machine vision inspection system includes an image collection part and an image analysis part, and the image collection part is mainly undertaken by industrial cameras, industrial lenses and machine vision light sources.

Ⅰ. What is the role of light sources in machine vision?

Illuminate the object, increase the height, form an imaging effect that is beneficial to image processing, reduce the complexity of the system and the requirements for image processing algorithms, defeat ambient light interference, ensure image stability, and improve system accuracy and power.

Through proper light source lighting planning, the information in the image and the scene information can be optimally separated, which not only greatly reduces the algorithm difficulty of image processing, but also improves the accuracy and reliability of the system.

But it's so small that there isn't a universal machine vision system lighting right now. Different inspection requirements can be handled, so for each specific case, it is necessary to plan adapted lighting equipment to achieve the best effect. Improper lighting can cause many problems. Machine vision light sources are so important, they are often overlooked by many people.

Ⅱ. The light source of machine vision chooses LED

Now the light source of machine vision system mainly uses LED (light emitting diode), which is widely used in the industry due to its high degree of freedom of shape, long service life, fast response speed, good monochromaticity, various colors, and high cost performance.

1. Shape freedom. An LED light source is composed of many individual LEDs. Therefore, compared with other light sources, it can be made into more shapes, and it is easier to plan the shape and size of the light source according to the user's condition.

2. Long service life. In order for the image processing unit to obtain accurate and reproducible measurement results, the lighting machine vision system must ensure that a stable image input can be provided for a reasonably long period of time. The brightness of the LED light source decreases after 10.0 to 30,000 hours of continuous operation, but it is far better than other types of light sources. In addition, the continuous operation of the control system can suppress the heating of the luminous tube, and the service life will be doubled.

3. Fast response. The response time of the LED light-emitting tube is very short. The real meaning of the response time is to ensure the operation switching between multiple light sources or between different areas of a light source. When a dedicated controller is used to supply power to the LED light source, the time to reach the maximum illumination is less than 10s.

4.Various colors. Except for the shape of the light source. Another aspect of getting a stable image input is choosing the color of the light source. Even light sources of the same shape can produce very different images due to differences in color. In fact, how to use the technical characteristics of the color of the light source to obtain the image with the best contrast has always been the main direction of the development of the light source.

As a lens company china, we can provide kinds of bi telecentric lens for sale, if you are interested, please leave us a message.

Merits and Limitations of Industrial Machine Vision Technology in Manufacturing(2024年04月16日)

canrilloptics — 2024-04-16T11:57:41+0900

https://www.canrilloptics.com/the-limitations-of-machine-vision-technology-in-industrial-manufacturing.html

Industrial machine vision is the most effective way to realize smart and automated manufacturing. It has been regarded as the Machine Eyes of modern industry. It can realize non-contact measurement, defect what's human eyes can not see, and work 7*24 hours even in a bad working environment.

However, Machine vision whole systems require investment in equipment and engineers, while most medium-size companies are with a small profit. So it is hard to apply widely. In addition, machine systems are not so flexible as humans. They can only defect as the system's command while missing very obvious defects.

Ⅰ. Industrial Vision Technology

Machine vision is a technique and method for providing an image-based automatic detection and analysis, which is generally used in industrial application scenarios such as automatic detection, process control, and robot guidance.

Industrial vision technology systems require greater robustness, reliability, and stability than other visual systems, and often cost lower than those for government / military applications. Thus, industrial machine vision means cost-efficient, acceptable accuracy, high robustness, high reliability, high mechanical and temperature stability.

Ⅱ. Components Of Machine Vision System

The main components of a telecentric lens machine vision system include lighting, lenses, image sensors, visual processing, and communications. The partial inspection by the lighting’s illumination allows its features to be highlighted, so they can see the camera's lens clearly. It captures the image and presents it to the sensor in the form of light. The sensor converts light into digital images in a machine vision camera and then sends it to the processor for analysis.

Ⅲ. Advantages of Indsutrial Machine Vision Application In Manufacturing

The computer vision system has the ability to watch and explain, and it can automatically complete multiple tasks without manual intervention. Therefore, business users can enjoy the following benefits:

1. A faster and simpler process

The machine vision system can perform monotonous and repetitive tasks at a faster speed, making the whole process simpler.

2. Accurate results

The machine never makes mistakes. Similarly, unlike humans, machine vision systems with image processing capabilities can't make mistakes. Ultimately, the products or services provided are not only fast, but also of high quality.

3. Cost reduction

As the machine assumes the responsibility of performing tedious tasks, errors will be minimized, leaving no room for defective products or services. Therefore, the company can save a lot of money, otherwise, the money will be spent on repairing defective processes and products.

No technology is perfect. The same principle applies to industrial machine vision technology. Despite the current limitations of computer vision systems, it can provide companies with huge opportunities to increase revenue sources, achieve productivity goals, and simplify work processes.

Ⅳ. Limitations of Industrial Machine Vision Application In Manufacturing

1. Constrained by the ambient light source

Different light sources will cause different imaging quality and effects, directly interfere with the detection of the detection algorithm, and may cause misjudgment of the product; a single visual guidance technology cannot guarantee the accuracy of obstacle detection in the path, and the decision-making control layer often needs to integrate multiple sensors Information collected.

2. Restricted by the performance of hardware equipment

The camera's lens distortion correction, calibration differences, and limited viewing angle range; installation conditions and site restrictions, and requirements for sensor fusion schemes; the dark current of each pixel is different, and the response to photons is inconsistent, which will cause spatial and pattern noise in the camera; the limitation of parameter setting of CCD line scan camera lens.

3. Restricted by computing resources on the end

The large-scale and complex model architecture of industrial products needs to rely on powerful computing capabilities. When the memory on the device terminal is difficult to meet, it needs to use the model cloud offline training and then deploy to the device terminal; image data transmission still needs to adjust and optimize the model parameters for specific task targets, which will generate additional engineering overhead, and the real-time performance is poor.

4. Restricted by the diversity of detection objects

There are many kinds of defects on the surface of the object, the mechanism of defect generation is unknown, and the description of the defect is insufficient; it is difficult for the machine vision system to extract features from the data.

5. Restricted by cost and benefit economy

The development of the core components of machine vision system such as vision sensors and the underlying vision software requires a large investment cost.

Related Machine Vision Telecentric Lens Articles

Beyond Clarity: Telecentric Lens Images and Their Impact on Precision
Seeing the Unseen: Applications of Machine Vision Systems in Automation
Telecentricity Unleashed: Applications in Semiconductor Inspection
Performance of Telecentric Illumination in Different Applications

If you want to know more about how does machine vision work, please visit our website.

As a camera lens manufacturer, we will do our best to meet all the needs of customers.

The Influence of Industry Lens Resolution on High-definition Industrial Camera Imaging(2024年04月16日)

canrilloptics — 2024-04-16T11:56:48+0900

https://www.canrilloptics.com/the-influence-of-industry-lens-resolution-on-highdefinition-industrial-camera-imaging.html

Usually, to perfectly achieve desired high-definition image acquisition, only using high-definition industrial cameras is not enough. The high-definition industry lens is also indispensable for the whole system.

We often hear some manufacturers advertise that their products have reached 5 million, 8 million,14 million or even 29 million pixels in the security industry. This is a great leap compared to the 2 million and 3 million pixels commonly used for monitoring. Whether these pixels can be really reached or just achieved through interpolation, we can first check if the effect of the product is so significant.

High Resolution Lens:

When considering how many pixels are in the industry lens, we should also pay attention to one element - the size of the sensor (or pixel size). For the sensor with the same pixel, the size of the sensor determines the size of its single-pixel and determines the image sharpness.

For example, most of the 5-million-pixel industrial cameras with industrial vision technology commonly seen in the market correspond to 2/3"(1") sensors. The corresponding imaging specification of the 2/3" sensor is 8.8mm × 6.6mm. It can be roughly estimated that the size of single-pixel points is about 3.4μm × 3.4μm, while that of the common 3-million-pixel products are mostly only 1/3" (1/2"). And, as the corresponding imaging specification of 1/3" sensors is 4.8mm × 3.6mm, the size of the single-pixel point can be calculated as 2.4 μm × 2.4 μm.

Compared with the 5-million-pixel sensor, the total pixel of the 3-million-pixel sensor is near twice as short. However, the sensor area of 3-million-sensor is twice smaller, and its single pixel is 1 μm smaller, which are also important factors affecting the whole image's sharpness.

As one of camera lens makers, we will do our best to meet all the needs of customers.

The Difference Between a Telecentric Lens and a Normal Lens(2024年02月07日)

canrilloptics — 2024-01-30T10:33:01+0900

https://www.canrilloptics.com/the-difference-between-a-telecentric-lens-and-a-normal-lens.html

What Is A Telecentric Lens?
The telecentric industrial lens is a lens specially designed to correct the parallax of the traditional industrial lens. In optics, telecentric meaning is a certain multi-element lens designs in which the chief rays are collimated and parallel to the optical axis in image and object space. telecentric lenses machine vision can be within a certain range of object distance so that the image magnification will not change with the change of object distance, which is a very important application when the measured object is not on the same surface.

The closer the target object of an ordinary telecentric lens vs normal lens is to the lens (the shorter the working distance), the larger the image formed. When using an ordinary non telecentric lens for size measurement, there will be the following problems:

(1) Because the measured object is not in the same measuring plane, the magnification is different;

(2) Large lens distortion;

(3) Parallax means that when the object distance increases, the magnification of the object also changes;

4) The resolution of the lens is not high;

5) The uncertainty of the position of the edge of the image due to the geometric characteristics of the visual light source.

The machine vision telecentric lens can effectively solve the above-mentioned problems of ordinary lenses, and there is no judgment error of this nature, so it can be used in high-precision measurement, metrology, etc. The telecentric lens machine vision is a high-end industrial lens, usually with superior image quality, especially suitable for size measurement applications.

The Advantages And Disadvantages of Telecentric Lense
No matter where, at the certain telecentric lens working distance, the same magnification will be obtained after refocusing, because the maximum field of view of the telecentric lens is directly related to the proximity of the lens diaphragm. The larger the lens size, the bigger the required scene. The telecentric measuring lens can provide superior image quality with less distortion than traditional fixed focus lenses. This telecentric lens design makes the image surface more symmetrical and can be used with software for precise measurement.

The Advantages of Prdinary Lenses:

low cost, practical, and versatile.

Disadvantages of ordinary lenses:

the magnification will change and there will be parallax.

Ordinary lens application: imaging of large objects.

The advantages of a telecentric lens machine vision:

the magnification is constant, does not change with the depth of field, and there is no parallax.

Disadvantages of telecentric imaging lens:

high cost, large size, and heavy weight.

Application of telecentric lens: metrology, measurement based on CCD, microcrystals.

The focal length of the lens is divided into the focal length of the image side and the focal length of the object side. The image focal length is the distance from the main surface of the image to the focal point of the image. Similarly, the focal length of the object is the distance from the main surface of the object to the focal point of the object.

The image-side focal length is the distance from the intersection of the light rays passing through the lens to the lens when the incident light is parallel; when the point light source is a certain distance from the lens, the refracted light is parallel, and this distance is called the object focal length.

Telecentric Lens Applications
Machine vision is the technology and process that the machine detects and makes analysis the assembly line automatically. Machine vision system can be used in manufacturing and warehousing industry to help quality inspection, production line tracking and trace.

Telecentric Lens in Machine Vision Applications in Industry Include:
Lithium ion battery production

Automotive parts manufacturing

Mobile components manufacturing

Textile production

3C electrionics manufacturing

Semi conductor manufacturing

Printing industry

Solar power industry

Pharmaceutical assembly lines

Medical equipment and devices manufacturing

The machine vision system can inspect packaging and assembly, track, process control, and make robotic guidance for product or component. The key component of a machine vision system is its telecentric lens, which provides the machine with the best possible "vision".

In detail, telecentric lens can be used in machine vision guidance, machine vision inspection, machine vision measurement and machine vision identification.

machine vision guidance: to locate and report the position and orientation of a part in 2D or 3D space to a machine controller.

machine vision inspection: to detect defects, contaminants, functional flaws, and other irregularities in manufactured products.

machine vision measurement: to calculate the distance between two or more points on objects to determine whether it meets the requirement by vision system.

machine vision identification: to identify parts by setting specific requirements.

Canrill manufactures a wide range of telecentric lens in various parameters. We also provide professional telecentric lens customization services. Welcome to inquiry us for details.

There are many top optical lens manufacturers, but we are one of the best choices for you.

The Analysis of Four Parameters of Machine Vision Lens(2024年02月06日)

canrilloptics — 2024-01-30T10:32:19+0900

https://www.canrilloptics.com/the-analysis-of-four-parameters-of-machine-vision-lens.html

If the machine vision system cannot collect clear and accurate images, it cannot guarantee whether the subsequent series of operations are correct or meaningful. Therefore, in the entire machine vision system, image collection is a crucial link.

The machine vision lens is an important component to realize the measurement and judgment of the machine vision system using the machine instead of the human eye. The quality of the lens directly affects whether the entire system can obtain high-quality images and whether it can achieve automation and intelligence.

Next, we will have a certain understanding of the machine vision lens by explaining and analyzing the main parameters of the optical lens.

Ⅰ. The focal length of the machine vision lens selection

The focal length is the distance from the center point of the lens to the focal point where a clear image is displayed. The focal length is an important performance indicator of a machine vision lens, and its length determines the size of the image, the size of the angle of view, and the size of the depth of field. The shorter the focal length, the larger the angle of view, and the larger the range that can be observed; conversely, the longer the focal length, the smaller the angle of view, and the smaller the range that can be observed. In order to better realize the acquisition of images, the lens is divided into two categories: fixed focus and zoom.

Ⅱ. The aperture of the machine vision lens

The aperture is a mechanical device that changes the size of the middle hole in the lens, and its size is determined by the ratio of the focal length to the transmit aperture. The smaller the ratio, the larger the aperture, the greater the amount of light transmitted per unit time; conversely, the larger the ratio, the smaller the aperture, and the smaller the amount of light transmitted.

Ⅲ. The depth of field of the machine vision lens

There is a certain limit to the clear range of the object to be photographed by the machine vision lens, and the depth of field refers to the range that can be clearly displayed within a certain distance in front of and behind the object after the object is clearly focused. Depth of field is closely related to aperture, focal length, and shooting distance:

(1) The larger the aperture, the smaller the depth of field; the smaller the aperture, the larger the depth of field;

(2) The longer the focal length, the smaller the depth of field; the shorter the focal length, the greater the depth of field;

(3) The farther the shooting distance, the greater the depth of field; the closer the distance, the smaller the depth of field.

Ⅳ. The shooting distance of the machine vision lens

As the name suggests, the distance from the working surface of the lens to the object to be measured is the so-called shooting distance.

In addition to the above four main parameters that affect each other, the parameters of the machine vision lens also include the size of the CCD, the interface with the camera, the resolution, the field of view, the optical magnification and so on. It is these parameters that affect whether the machine vision lens can play its role. When selecting a lens, it must be based on the principle of being suitable for detection needs. Therefore, it is essential to understand its parameters.

If you need any kinds of microscopy lens, please contact us, as a professional lens company china, Canrill lens is willing to offer you high quality products.

The Advantages of Machine Vision System(2024年02月05日)

canrilloptics — 2024-01-30T10:31:42+0900

https://www.canrilloptics.com/the-advantages-of-machine-vision-system.html

1. The high social benefits of machine vision system

The main benefits of machine vision to society are: saving time; reducing production costs; improving productivity and product quality; reducing the labor intensity of testing and inspection personnel; reducing the number of unqualified products; improving machine utilization and so on.

2. The strong peripheral advantages of machine vision system

The history of the development of automation technology is the history of machines gradually replacing humans. The human brain, limbs, senses, and nerves correspond to CPU, motion control, sensors and networks respectively. However, in many cases, human vision is increasingly unable to meet the requirements. Compared with human vision, machine vision has the advantages of high speed, high precision, supervision, macrospur, objectiveness, no fatigue, and environmental restriction.

3. The wide applications of machine vision system

The advanced machine vision system is often used for measurement, inspection (such as presence detection, defective product detection, digital statistics, defect detection), positioning, identification (such as code reading, color recognition), etc.

Founded in 2009, Shenzhen Canrill Technologies Co., Ltd is the first company in China to focus on the design, manufacturing and marketing of telecentric lenses. It is also the only company that has its own mechanical factory and optical factory in the entire industrial lens industry to build a complete supply chain. If necessary, please consult us.

If you need any kinds of industrial camera lens, please contact us, as a professional lens company china, Canrill lens is willing to offer you high quality products.

Introduction of Machine Vision Inspection Systems(2024年02月04日)

canrilloptics — 2024-01-30T10:31:12+0900

https://www.canrilloptics.com/introduction-of-machine-vision-inspection-systems.html

Introduction of Machine Vision Inspection Systems
1. Machine vision inspection is widely used
With the development of computer technology and Fieldbus technology, machine vision has become an indispensable product in modern processing and manufacturing. Machine vision inspection equipment has been widely used in food and beverage, pharmaceutical and chemical plants, electronics manufacturing and automobiles. In many industries such as production and manufacturing, computer products are used to simulate human visual functionality to capture images quickly and accurately. After that, the images are transferred to the processing unit for digital processing and intelligent identification and finally used for actual inspection, measurement and control, with the characteristics of fast speed, large information capacity, and powerful functions, becoming indispensable products in the modern processing industry.

Based on its working characteristics of continuity and a large number of digital image processing, the machine vision inspection equipment has strict requirements on the durability, stability and image processing capabilities of the computer hardware used in it. It must be equipped with professional and reliable intelligent industrial control hardware equipment.

2. Advantages of machine vision system
The machine vision system effectively integrates the detection technology of computer vision and image processing technology. It uses digital image processing as a detection method, recognizes objects through the machine rather than the human vision system, and then applies image processing methods to obtain effective information, such as surface layer morphology and various parameters.

Machine vision inspection technology can be applied to various industries related to control, measurement, inspection, etc., and can automatically obtain and analyze images of specified things through computers.

Nowadays, with the integrated development of computer technology and electronic circuit design, the reliability of machine vision is getting higher and higher.

The telecentric lens machine vision system adopts advanced hardware equipment and reasonable image processing algorithms, so when inspecting photoelectric elements, it can quickly complete the entire inspection process and obtain inspection conclusions in time.

The traditional vision method is affected by objective factors, and the accuracy of the detected products is not ideal. The processing process of the machine vision system is carried out by a computer, which greatly removes the accidental errors caused by artificial vision detection and ensures the detection accuracy of high-precision parts, as well as improves work efficiency.

The industrial camera, the core component of the machine vision inspection system, converts the detected target into an image data signal and transmits it to a dedicated digital image processing system. According to the pixel distribution area, brightness, color and other information, it is converted into a digital data signal. This signal carries out various operations to extract the characteristics of the purpose, and then outputs the result according to the preset tolerance and other necessary conditions, including size, angle, number, pass/fail and presence/absence, to achieve automatic detection functionality.

If you need any kinds of industrial camera lens, please contact us, as a professional china lens manufacturer, Canrill lens is willing to offer you high quality products.

Five Main Reasons to Use Machine Vision Systems(2024年02月03日)

canrilloptics — 2024-01-30T10:30:34+0900

https://www.canrilloptics.com/five-main-reasons-to-use-machine-vision-systems.html

1. The repeatability of machine vision system
The machine vision system can complete inspection work in the same way again and again without feeling tired. In contrast, every time human eyes inspect a product, there will be a slight difference, even if the products are exactly identical.

2. The accuracy of machine vision system
Due to the physical limitations of human eyes, the machine vision system has obvious advantages in terms of accuracy. Even if human eyes rely on magnifying glass or microscope to inspect the product, the machine will still be more accurate because its accuracy can reach one-thousandth of an inch.

3. The speed of machine vision system
The machine vision system can inspect products faster, especially for high-speed moving objects, for example, on a production line, the machine can improve production efficiency.

4. The objectivity of machine vision system
There is another fatal flaw in human eye testing, which is the subjectivity brought about by emotions. The test results will change with different moods of workers. However, the machine has no emotions and the test results are naturally very objective and reliable.

5. The cost of machine vision system
Since the working speed of machine vision system is faster than that of humans, an automatic inspection machine can take on the tasks of several people. Moreover, the machine does not need to rest, will not get sick, and can work continuously, so it can greatly improve production efficiency.

The characteristic of telecentric lens machine vision system is to improve the flexibility and automation of production. In some dangerous working environments that are not suitable for manual operations or occasions where artificial vision is difficult to meet the requirements, machine vision is often used to replace artificial vision; at the same time, in the mass industrial production process, manual visual inspection of product quality is inefficient and inaccurate while the use of machine vision inspection methods can greatly improve production efficiency and automation.

If you need any kinds of double telecentric lens, please contact us, as a professional lens manufacturer, Canrill lens is willing to offer you high quality products.

Telecentric Lens Design Principle and Technical Advantages(2024年02月02日)

canrilloptics — 2024-01-30T10:30:00+0900

https://www.canrilloptics.com/design-principle-and-technical-advantages-of-telecentric-lens.html

Telecentric Lens is an optical design that the principal ray is in parallel to the optical axis. Because of these characteristics, the main advantages of the telecentric lens is to eliminate distortion when off-focus and provide superior image performance when doing high precision measurement and inspection.

Telecentric Lens Definition
Telecentric lens has three catagories, object space telecentric, image space telecentric and bi telecentric lens. The difference between these three kinds lies in that the chief ray which is parallel to the optical axis is on the object space, or in the image side, or in both the object and image spaces. Object space telecentric lens and bi telecentric lenses are the most popular telecentric lens in applications.

Telecentric Lens Design
The purpose of telecentric lens design is to eliminate the difference in magnification caused by the inconsistency of the distance between the measured object and the lens. And different telecentric lenses will need different telecentric design.

The design principle of the object space telecentric light path
The convergent center of the object space chief ray parallel to the optical axis is located infinitely far away from the image space, which is called the object space telecentric light path. Its function is: it can eliminate the reading error caused by inaccurate focusing of the object.

The convergent center of the chief ray of the image side parallel to the optical axis is located infinitely far away from the object, which is called the image-side telecentric light path. Its function is to eliminate the measurement error caused by the inaccurate focusing on the image side

It integrates the dual functions of object space/image space telecentricity, and is mainly used in the field of vision measurement and detection. Bi-telecentric lens, which is also called a double telecentric lens, adopts this principle.

Technical Advantages of telecentric optical system
High resolution
The image resolution is generally measured by the CTF (contrast transfer function) that quantifies the existing spatial frequency contrast of the image sensor, and the unit is lp/mm. Most machine vision integrators often just gather a large number of cheap low-pixel, low-resolution lenses, and finally can only generate blurred images. With a telecentric imaging system, even with a small pixel image sensor, high-resolution images can be generated.

True telecentric lens design: ultra-wide depth of field and low distortion
There was a view that the telecentric lens photography mainly solves the distortion problem. In fact, the telecentric lens solves not only the distortion problem, but the low distortion is only an additional attribute of the telecentric lens. The unique optical characteristics of the telecentric lens: when the object moves in the field of view, its magnification in different positions will not change, which determines that it cannot be replaced by ordinary industrial lenses in some fields. For example, its larger depth of field can be well adapted to the working environment on site, which is not a problem that can be solved only by algorithms.

Unique parallel light path design
Designing a telecentric industrial lens for parallel-light imaging is not complicated in theory, but it is another matter to achieve a certain resolution and imaging quality. The telecentric lens design and manufacture is indeed more difficult than a lens in the general sense. The reason is that the size of the optical lens of the telecentric lens is relatively large, which makes the correction of various phase differences of the edge light more difficult.

In order to obtain a good image quality of the edge field of view, higher product design and manufacturing accuracy is required, and in many cases it is necessary for the designer to have relatively rich design experience.

Choose the Right Telecentric Lens Design
How to choose the right telecentric lens design? First of all, the lens-compatible CCD size should be equal to or larger than the camera sensor size; Secondly, calculate the mag when the object size and camera sensor size are confirmed, always choose a smaller mag if no existing suitable mag so as to cover all the object area. Finally, check the WD & lens size to make sure it can fit in the whole system's design. Pay attention to other requirements like distortion, or DOF if necessary.

If you are looking for a reliable optical lens manufacturer, don't hesitate to contact us!

Definition and Application of the Machine Vision System(2024年02月01日)

canrilloptics — 2024-01-30T10:29:25+0900

https://www.canrilloptics.com/definition-and-application-of-the-machine-vision-system.html

Application of machine vision system
1. What is a machine vision system?

Simply put, the machine vision system can replace people to make some measurements and judgments. In fact, machine vision belongs to a branch of computer science, and it is a very important branch.

Machine vision system technology integrates optical, mechanical, electronic and computer hardware technologies. It also involves technologies such as computer processing, image analysis, pattern recognition, and has outstanding contributions in artificial intelligence and signal processing!

2. Machine vision application range of the machine vision system:
Generally, machine vision has a wide range of applications. For example, on the production line, if humans are employed to do some tests and judgments, they will get tired after a long time. But we know that the machine will not be tired. As long as there is enough power supply, the machine can keep working for a long time steadily. Now general machine vision systems include lighting systems, industrial camera lenses, industrial cameras, processing technology of professional image. General telecentric lens machine vision systems can be roughly divided into image acquisition, image processing and control parts.

Shenzhen Canrill Technologies Co., Ltd is the first company in China to focus on the design, manufacturing and marketing of telecentric lenses, and the only company that has its own mechanical factory and optical factory and a complete supply chain in the industry of industrial lens. Our goal is to produce top-level lenses and become one of the leaders in telecentric technology. If interested, please consult.

If you need any kinds of double telecentric lens, please contact us, as a professional custom lens manufacturer, Canrill lens is willing to offer you high quality products.

Machine Vision Telecentric Illuminator(2023年04月08日)

canrilloptics — 2023-04-07T12:35:51+0900

https://www.canrilloptics.com/products/telecentric-illuminator/

Telecentric illuminator is of great significance to the image processing system. Providing stable and reproducible illumination conditions, the telecentric illuminator produced by Canrill can help the image processing tools, such as our machine vision telecentric lens, to better capture the visual image of the object.

Better clarity and WBC, higher telecentricity

Especially suitable for round workpiece measurement

Telecentric Illumination
Regarding the telecentric illumination techniques in machine vision, the concept of telecentric light rays collimating and parallel to the optical axis also applies. Canrill telecentric illuminator machine uses optical devices to direct light from fiber-optic guides or LEDs to the object being examined, producing high-contrast silhouettes. TV central luminescence improves edge contrast and measurement accuracy by reducing diffuse reflection from objects. The collimating light leaves the illuminator and remains on the collimating surface as it strikes the object. In contrast, light from a standard backlight expands and interferes with each other, resulting in diffuse reflection.

Machine Vision Telecentric Lens(2023年04月07日)

canrilloptics — 2023-04-07T12:35:00+0900

https://www.canrilloptics.com/products/telecentric-lens/

A Telecentric lens is a kind of lens that the chief rays are parallel to the optical axis. There are three kinds of telecentric lens, that is the object-space telecentric lens, image-space telecentric lens, and the bi-telecentric lens. Telecentric lens is always the core business of Canrill Lens. After continuous research and development for 11 years, Canrill has successfully developed 1700+ kinds of lenses, and the number is still increasing, to meet the diverse and growing applications at the best telecentric lens price.

Difference Between Object Space Telecentric Lens And Bi Telecentric Lens
Telecentric lenses have two types of telecentricity: object space and image space telecentricity (referring to the entrance and exit pupil positions, respectively). Therefore, telecentric lenses are divided into: object space telecentric lens, image space telecentric lens, and bi telecentric lens.

Object Space Telecentric Lens
In general, a machine vision telecentric lens refers to an object space telecentric lens. If the entrance pupil of the lens is located at an infinite position in the image side (all objects behind the objective lens), it can be called an object space telecentric lens. The chief ray originated from optical axis is parallel with optical axis in object side ( or to say have very small angle θ which is called telecentricity in telecentric lens specs), while in image side is not parallel.

In the optical design, object space telecentricity is achieved by placing the system's iris diaphragm at the intersection of the front-end groups. Since the entrance pupil is at infinity, the field of view is constant and has no field angle. Since the chief ray (which defines the system's field of view) passes through the optical axis at the aperture stop, when the pupil is at infinity, the ray is parallel to the optical axis and the field of view is zero. By contrast, any entrance pupil within a finite distance of the lens results in a non-parallel fiber.

An object space telecentric lens in which the chief ray is completely parallel to the optical axis in the object space. Note that the field of view does not change no matter where the object plane is, because the chief ray that defines the field of view is perfectly parallel to the optical axis.

Bi Telecentric Lens
Although object space telecentric lens can provide much higher measurement accuracy than conventional lenses, bi telecentric lenses can also achieve higher accuracy if the lens is object and image space telecentric. The principle of image space and object space telecentricity also applies in bi telecentric lenses. In a bi-telecentric lens, the entrance and exit pupils project to their respective infinity. The chief ray originated from optical axis is parallel with optical axis in both object side and image side ( or to say have very small angle θ which is called telecentricity in telecentric scan lens specs).

Bi-telecentric lenses are the most accurate type of telecentric lenses because their field of view is completely unaffected by changes caused by changes in object position or sensor position, nor does it operate any cos4θ attenuation. The diagram below shows the comparison of three different lenses: fixed focal length lens, object space telecentric lens, and double-telecentric lens. The X-axis represents the change in working distance (mm) from the nominal value, and the Y-axis represents the dimensional error percentage from the actual value.

As you can see, the bi -telecentric lens is the most accurate lens in the group, with a working distance offset of 4mm and an error of less than 0.2% during this period. Bi-telecentric lenses should be used in applications that require the highest accuracy and precision.

Non Telecentric Lens
The chief ray originated from optical axis has a angle θ with optical axis. For objects at different WD from the lens, the lens will have either smaller or larger mag.

Telecentric Lens Design Principle and Technical Advantages(2022年12月12日)

canrilloptics — 2022-12-12T12:54:48+0900

https://www.canrilloptics.com/design-principle-and-technical-advantages-of-telecentric-lens.html

Telecentric Lens Definition
Telecentric imaging lens has three catagories, object space telecentric, image space telecentric and bi telecentric lens. The difference between these three kinds lies in that the chief ray which is parallel to the optical axis is on the object space, or in the image side, or in both the object and image spaces. Object space telecentric lens and bi telecentric lens are the most popular telecentric lens in applications.

Technical Advantages of Telecentric Lens
High resolution
The image resolution is generally measured by the CTF (contrast transfer function) that quantifies the existing spatial frequency contrast of the image sensor, and the unit is lp/mm. Most machine vision integrators often just gather a large number of cheap low-pixel, low-resolution lenses, and finally can only generate blurred images. With a telecentric lens, even with a small pixel image sensor, high-resolution images can be generated.

True telecentric lens design: ultra-wide depth of field and low distortion
There was a view that the telecentric lens mainly solves the distortion problem. In fact, the telecentric lens solves not only the distortion problem, but the low distortion is only an additional attribute of the telecentric lens. The unique optical characteristics of the telecentric lens: when the object moves in the field of view, its magnification in different positions will not change, which determines that it cannot be replaced by ordinary industrial lenses in some fields. For example, its larger depth of field can be well adapted to the working environment on site, which is not a problem that can be solved only by algorithms.

Choose the Right Telecentric Lens Design
How to choose the right telecentric lens design? First of all, the lens compatible CCD size should be equal or larger than the camera sensor size; Secondly, calculate the mag when the object size and camera sensor size are confirmed, always choose a smaller mag if no existing suitable mag so as to cover all the object area. Finally, check the WD & lens size to make sure it can fit in the whole system's design. Pay attention to other requirements like distortion, or DOF if necessary.

As a professional bi telecentric lens factory, we provide telecentric lens system, telecentric optical system, telecentric imaging system, telecentric objective, telecentric system, etc. For more information, please feel free to contact us!

Telecentric Lens Design Principle and Technical Advantages(2022年12月12日)

canrilloptics — 2022-12-12T12:54:21+0900

https://www.canrilloptics.com/design-principle-and-technical-advantages-of-telecentric-lens.html

Telecentric scan lens is an optical design that the principal ray is in parallel to the optical axis. Because of these characteristics, the main advantages of the telecentric lens is to eliminate distortion when off-focus and provide superior image performance when doing high precision measurement and inspection.

Telecentric Lens Definition
Telecentric lense has three catagories, object space telecentric, image space telecentric and bi telecentric lens. The difference between these three kinds lies in that the chief ray which is parallel to the optical axis is on the object space, or in the image side, or in both the object and image spaces. Object space telecentric lens and bi telecentric lens are the most popular telecentric lens in applications.

As a professional bi telecentric lens factory, we provide telecentric lens system, telecentric lenses machine vision, machine vision telecentric lens, telecentric lens photography, telecentric lens machine vision, etc. For more information, please feel free to contact us!

The Difference Between a Telecentric Lens and a Normal Lens(2022年12月12日)

canrilloptics — 2022-12-12T12:53:49+0900

https://www.canrilloptics.com/the-difference-between-a-telecentric-lens-and-a-normal-lens.html

What Is A Telecentric Lens?
The telecentric industrial lens is a lens specially designed to correct the parallax of the traditional industrial lens. In optics, telecentric meaning is a certain multi-element lens designs in which the chief rays are collimated and parallel to the optical axis in image and object space. Telecentric lens machine vision can be within a certain range of object distance so that the image magnification will not change with the change of object distance, which is a very important application when the measured object is not on the same surface.
The closer the target object of an ordinary industrial lens is to the lens (the shorter the working distance), the larger the image formed. When using an ordinary non-telecentric lens for size measurement, there will be the following problems:

(1) Because the measured object is not in the same measuring plane, the magnification is different;

(2) Large lens distortion;

(3) Parallax means that when the object distance increases, the magnification of the object also changes;

4) The resolution of the lens is not high;

5) The uncertainty of the position of the edge of the image due to the geometric characteristics of the visual light source.

The Advantages And Disadvantages of Telecentric Lenses
No matter where, at the certain telecentric lens working distance, the same magnification will be obtained after refocusing, because the maximum field of view of the telecentric lens is directly related to the proximity of the lens diaphragm. The larger the lens size, the bigger the required scene. The telecentric measuring lens can provide superior image quality with less distortion than traditional fixed focus lenses. This telecentric lens design makes the image surface more symmetrical and can be used with software for precise measurement.

The Advantages of Prdinary Lenses:

low cost, practical, and versatile.

Disadvantages of ordinary lenses:

the magnification will change and there will be parallax.

Ordinary lens application: imaging of large objects.

The advantages of a telecentric lens machine vision:

the magnification is constant, does not change with the depth of field, and there is no parallax.

Disadvantages of telecentric lenses:

high cost, large size, and heavy weight.

Applications of machine vision: metrology, measurement based on CCD, microcrystals.

Application of machine vision system
Machine vision is the technology and process that the machine detects and makes analysis the assembly line automatically. Machine vision system can be used in manufacturing and warehousing industry to help quality inspection, production line tracking and trace.

Telecentric Lens in Machine Vision Application Include:
Lithium ion battery production

Automotive parts manufacturing

Mobile components manufacturing

Textile production

3C electrionics manufacturing

Semi conductor manufacturing

Printing industry

Solar power industry

Pharmaceutical assembly lines

Medical equipment and devices manufacturing

The machine vision system for automatic inspection can inspect packaging and assembly, track, process control, and make robotic guidance for product or component. The key component of a machine vision for factory automation system is its telecentric lens, which provides the machine with the best possible "vision".

In detail, telecentric lens can be used in machine vision guidance, machine vision quality inspection, machine vision measurement and machine vision identification.

machine vision guidance: to locate and report the position and orientation of a part in 2D or 3D space to a machine controller.

machine vision inspection: to detect defects, contaminants, functional flaws, and other irregularities in manufactured products.

Machine vision for inspection and measurement: to calculate the distance between two or more points on objects to determine whether it meets the requirement by vision system.

machine vision identification: to identify parts by setting specific requirements.

Canrill manufactures a wide range of telecentric lens in various parameters. We also provide professional telecentric lens customization services. Welcome to inquiry us for details.

Want to know the details of machine vision for manufacturing, please visit our website.

Machine Vision Telecentric Lens(2022年)

canrilloptics — 2022-10-20T12:24:30+0900

https://www.canrilloptics.com/products/telecentric-lens/

Machine Vision Telecentric Lens
A Telecentric lens is a kind of lens that the chief rays are parallel to the optical axis. There are three kinds of telecentric lens, that is the object-space telecentric lens, image-space telecentric lens, and the bi-telecentric lens. Telecentric lens is always the core business of Canrill Lens. After continuous research and development for 11 years, Canrill has successfully developed 1700+ kinds of lenses, and the number is still increasing, to meet the diverse and growing applications at the best telecentric lens price.

Advantages Of Telecentric Imaging Lens System

High telecentricity and little-to-no distortion for accurate measurements.
Good consistency for better telecentric imaging system.
Extensive range of machine vision telecentric lens covering sensor size from 4.8mm to 82mm and supporting object FOV from 0.7mm to 390mm.
Considerable inventory offers the quickest leading time in industry.
Quick customization service, break the customization record by producing a new telecentric lens machine vision within 12 days from design to finished product.
World-famous brands endorsement, like Apple, Samsung, Huawei, Han's Laser, Foxconn, etc.
Telecentric Lens Tutorial

What is a Telecentric Lens?

The machine vision telecentric lens design is mainly to correct traditional industrial lens parallax. Within a certain range, a telecentric lens for machine vision can make the image magnification of the image does not change. Currently, due to its unique parallel optical path design, the telecentric lens has been widely favored by machine vision applications that are highly required for lens distortion.

What's The Difference Between Resolution & Mtf30 For The Telecentric Lens?

Resolution and MTF have a different definition method.

Resolution formula is R=0.61*λ/NA. R is object resolution and λ is wavelength, which is usually 0.55um. NA is the numerical aperture of the object side of the lens.

For example, XF-MT1X65D, the NA is 0.045, thus the resolution is 0.61*0.55/0.045≈7.45um. ( the resolution in our product list and drawings is 7.33um, is because decimal point numbers )

Therefore the corresponding line pairs should be 1000/(7.33*2)=68Lp/mm.

MTF is Contrast of output image/Contrast of input image. Since the input image is always larger than the output image, therefore the MTF value is always from 0-1.

MTF30 means the line pairs when the image MTF value is 0.3.

So to calculate the image side resolution, the formula is 1/MTF30/2.

For example, XF-MT1X65D, the MTF30 is 90lp/mm, then the resolution is 1/90/2=5.56um.

What Is The Resolution Of Telecentric Lens?

Resolution is the ability to resolve details in the object. It describes the thinnest line that the human eye can distinguish. Normally, the resolution for machine vision telecentric lens image is as below:

R=0.6*λ/NA;

λ is the wavelength of the light(normally λ is 550nm);

NA is the numerical aperture of the lens.

How To Improve The Deep Of Field (dof) Of A Telecentric Lens?

The DOF of a telecentric lens can be changed by adjusting its aperature. When the aperature gets bigger, the DOF becomes smaller. When the aperature gets smaller, the DOF will increase.

What's The Advantage Of Telecentric Lens System?

Telecentric Lens can eliminate the parallax error characteristic by having a constant, non-angular field of view. Its magnification and field of view do not change at any distance from the object

Telecentric Lens has a very low level of distortion, which makes the telecentric lens an excellent choice for metrology applications

Telecentric Lens system can have a larger depth of field, which is beneficial in maintaining a very good image contrast even when looking at very thick objects

Telecentric Imaging System Application
Guidance

Inspection

Gauging

Identification

As one of the optical lens companies, we provides non telecentric lens, lithography lens, telecentric imaging lens, object space telecentric lens, telecentric camera and etc. Want to know working distance of lens or more, contact us.

Machine Vision Telecentric Illuminator(2022年)

canrilloptics — 2022-10-20T12:24:05+0900

https://www.canrilloptics.com/products/telecentric-illuminator/

Machine Vision Telecentric Illuminator
Telecentric illuminator is of great significance to the image processing system. Providing stable and reproducible illumination conditions, the telecentric illuminator produced by Canrill can help the image processing tools, such as our machine vision telecentric lens, to better capture the visual image of the object.

Better clarity and WBC, higher telecentricity

Especially suitable for round workpiece measurement

Telecentric Illumination
Regarding the illumination techniques in machine vision, the concept of telecentric light rays collimating and parallel to the optical axis also applies. Canrill telecentric illuminator machine uses optical devices to direct light from fiber-optic guides or LEDs to the object being examined, producing high-contrast silhouettes. TV central luminescence improves edge contrast and measurement accuracy by reducing diffuse reflection from objects. The collimating light leaves the illuminator and remains on the collimating surface as it strikes the object. In contrast, light from a standard backlight expands and interferes with each other, resulting in diffuse reflection.

Over the years, as a optical lens manufacturer, Canrill lens provides industry lens, non telecentric lens, lithography lens, telecentric imaging lens, object space telecentric lens and etc. Want to know more, contact us.

Non-Telecentric Lens(2022年)

canrilloptics — 2022-10-20T12:23:41+0900

https://www.canrilloptics.com/products/non-telecentric-lens/

Non Telecentric Lens
As a professional optical lens manufacturer in China, Canrill also produces high-quality non-telecentric lens with consistently high-quality.

New series

WD range from 49mm to 1405mm, magnification from 0.1X to 1X

Smaller size for installation in small space

Support to 2/3' C mounting industrial lens

Over the years, as a optical lens manufacturer, Canrill lens provides industrial camera lens, non telecentric lens, lithography lens, telecentric imaging lens, object space telecentric lens and etc. Want to know more, contact us.

Microscope Objective Lens(2022年)

canrilloptics — 2022-10-20T12:23:18+0900

https://www.canrilloptics.com/products/microscopy-lens/

Microscope Objective Lens
Suitable for ITO, particle detection, wafer inspection

Infinity optical design for different microscope lenses can match infinity objective lens with a different mag

High-contrast & brightness image solution

Microscope objective design of new modular allows customizing different optical layouts on customers' requests

Microscope Objective Lens Types
In general, when it comes to the microscope objective lens types, we refer to the different magnification and uses of the four most commonly different microscope lenses on composite optical microscopes.

Scan the lens (4x)
The scanning objective is designed for getting bearings right before moving onto the low power lens.

Low-power lens (10 x)
The low-power microscope objective lens usually has 10x or 20x magnification. You can identify it by a yellow stripe around the lens housing. This objective can be very useful for viewing prepared specimens on slides.

High-power lens (40 x)
The high-power microscopy lens is applied for looking at smaller specimens like bacteria and cells that are invisible to the naked eye.

Oil-immersion lens (100 x)
These lenses are called ‘oil immersion lenses’ because you usually need to use them with oil in order to view your specimen.

Microscope Objective Working Distance
In general, the operating microscope objective working distance decreases with magnification and numerical aperture. Nowadays, the popular trend is to produce dry microscope objectives with as long working distances as possible, but this requirement is partly limited by a high numerical aperture that requires high resolution. This usually result in the manufacturers making a compromise between these two parameters.

Over the years, as a optical lens manufacturer, Canrill lens provides industrial inspection lens, non telecentric lens, 1x microscope objective, microscope objective lenses labeled, telecentric imaging lens, bi telecentric lens and etc. Want to microscope lens sizes and microscope lens magnification, contact us.

DMD Lithography Lens(2022年)

canrilloptics — 2022-10-20T12:22:56+0900

https://www.canrilloptics.com/products/dmd-lithography-lens.html

We have been in close cooperation with LDI (Laser Direct Imaging) manufacturers, to research and produce LDI lens.

Our dual-waveband and tri-waveband LDI lens optimize the image quality completely and the transmittance, which is better than 80% during waveband from 360nm to 400nm while ensuring the image quality in the same time.

Over the years, as a optical lens manufacturer, Canrill lens provides industrial lens, non telecentric lens, lithography lens, lithographic lens, lithography lens design, telecentric imaging lens, bi telecentric lens and etc. Want to know more, contact us.

16k Line Scan (82mm) Telecentric Lens(2022年)

canrilloptics — 2022-10-20T12:22:31+0900

https://www.canrilloptics.com/products/16k-line-scan-82mm-telecentric-lens/

16k telecentric scan lens
Specially designed for large image circle up to 82mm in length

Suitable for line scan cameras such as 16K x 5μm,16K x 3.5μm,12K x 5μm, 8K x 7μm, etc, and area scan camera such as 155 mega pixels, 151 mega pixels

The adjustable iris of this machine vision telecentric lens series is adopted to balance the DOF and resolution perfectly

Excellent uniformity and little-to-no distortion

Some models support inner L90 steering, saving installation space

16 standard models available, support object FOV from 45mm to 390mm

Long working distance from 120mm to 700mm

M95 Mount, support customized mount

Over the years, as a optical lens manufacturer, Canrill lens provides line scan lens, non telecentric lens, telecentric imaging lens, machine vision telecentric lens and etc. Want to know more, contact us.

Machine Vision Lens & Illuminator(2022年)

canrilloptics — 2022-10-20T11:56:48+0900

https://www.canrilloptics.com/products/

Since 2009, Canrill has provided more than 1700 kinds of high-performance telecentric lens and illuminators for machine vision systems. With the characteristics of extensive models, immediate delivery, cost-effective solutions and free customization service, Canrill can always be your first choice to select the most suitable machine vision lens and machine vision illuminator.

Types of Optical Lenses & Illuminator

Wide range of high performance telecentric lens supporting sensor size from 4.8mm to 82mm, characterized by high resolution, little-to-no-distortion, and good imaging consistency.

Advantages Of Machine Vision System At Canrill
11 Years' R&D Experience
20+ Senior Researchers
1um Accuracy
1700+ Models
Lifetime Warranty

How Does Machine Vision Work?
Machine vision is the application of a camera or several cameras to check and analyze objects automatically. Machine vision systems mainly depend on the digital sensors in industrial cameras. There are equipped with technical optics to obtain external vision, thus the computer can process, analyze, and measure various features for decision making. Machine vision is preferred to be applied in an industrial environment due to its high efficiency. Lots of manufacturers use automated machine vision instead of human inspectors because it is better suited to repetitive inspection tasks. It is faster, more objective, and works continuously.

Custom Machine Vision Lens & Illuminator From Canrill

Canrill catalog or product list on the website only presents our most common models. Canrill also has an extensive of non-standard models in production. In addition, Canrill Optics offer customized machine vision lens or telecentric illumination device upon detailed request from customers. With rich experience both in optical design and mechanical engineering, and also our own optical factory and mechanical factory, Canrill is able to react fastest from design to prototype to mass production.

Canrill's record is 12 days to produce a completely new lens including design time.

Machine Vision System Applications
Canrill Optics provides the machine vision illuminator and lens products usually used in guidance, inspection, gauging and identification.

Over the years, as a custom lens manufacturer, Canrill lens provides lenses and optics, non telecentric lens, telecentric imaging lens and etc. Want to know working principle of machine vision system or more, contact us.

Selection method of telecentric lens(2021年10月06日)

canrilloptics — 2021-09-18T18:52:17+0900

https://www.canrilloptics.com/selection-method-of-telecentric-lens.html

The industrial lens is an important part of the machine vision acquisition system. As a relatively young member of the lens family, the telecentric lens is becoming more popular with its unique performance.

To know how to make a telecentric lens, you must first understand the telecentric lens's basic knowledge, from its operation principles, applications, to its type selection, and other aspects.

However, since the telecentric lens has not been introduced for a long time, many of its characteristics have not been widely known. This article will comprehensively review the telecentric lens and reveal the mysterious journey of light in the telecentric system.

Part one: Explanation of the working principle of the telecentric lens

First, we would start from several problems about the non-telecentric lens.

The first problem is that in the imaging process when the working distance of the lens changes, the size of the image would change accordingly. As a result, the lens with the same focal length would have different magnification for different working distances. This phenomenon is similar to the visual aberration of the human visual system; if you look at things near you, they are more significant than things far away. This problem can be ignored or even utilized in some applications. However, This problem can also be a significant obstacle when our vision system performs precision measurement.

The second problem is that ordinary lenses usually have a specific range of depth of field. When the measured object is not covered by the depth of the lens's field, the image would become blurred and cannot be focused clearly. Therefore, designers have designed a focusing ring on the ordinary lens. When the working distance changes, the interesting region can be seen clearly by adjusting the focal plane. If the depth of the measured object itself exceeds a specific range, both ends of the objects cannot be seen by the lens simultaneously. Thus, to solve this problem, we have to find other methods.

The third problem is that with the continuous improvement of imaging chips' resolution, users have more stringent requirements on measurement accuracy. As ordinary lenses are subject to the principle of optical imaging, the lens can only achieve the best measurement accuracy of about 10um. In the field of visual inspection, imaging products with higher accuracy are needed.

A double telecentric lens is designed to solve these problems. By placing an aperture in the middle of the optical system, the leading light could pass through the center of the aperture. Then the leading light of the object side and the imaging side could enter the lens parallel to the optical axis. The parallel incident light ensures a large enough range of depth of field. Also, the parallel light from the lens ensures that even if the working distance changes significantly within the range of field depth, the imaging height, i.e., the magnification, would not change.

Part two: Applications of the telecentric lens

When should a machine vision telecentric lens be used? We suggest that the double telecentric lens can be chosen in the following situation.

When the object is too thick, and more than one plane needs to be measured, such as food boxes, beverage bottles, etc.

When the object's defects need to be measured, while they can only be measured under parallel illumination in the same direction.

When necessary to ensure the measurement accuracy; for example, when the allowable error is 1 um.

When the object has an aperture or is three-dimensional.

When the low distortion rate and the brightness of the image effect are required to be almost the same.

When the measured object's position is uncertain but maybe at a certain angle with the lens.

When the object jumps up and down in the measurement process, such as the production line's vibration leading to the change of the working distance.

Part three: Type selection of the telecentric lens

The type selection method of the telecentric lens is similar to that of the ordinary optical system. The following points should be paid attention to:

Compatible CCD target surface size

As the selection of ordinary lens, the CCD target surface compatible with the telecentric lens must be greater than or equal to the matching camera target surface; otherwise, the resolution would be wasted.

Interface type

At present, the interface type of telecentric lens is similar to that of the ordinary lens, including C port and F port, which can be used as long as it is matched with the camera.

Magnification, or imaging range

When the magnification and CCD target surface is determined, the imaging range is determined, and vice versa.

Working distance

Generally, when the above three points are specified, the working distance has also been determined within a specific range, which is determined by the optical imaging path. It should be noted that whether the working distance meets the actual requirements. When using the telecentric optical system for measurement, we suggest that the lens be selected first, and other mechanical structures should be designed according to its working distance.

Canrill Optics is a professional optical lens manufacturer, we provide machine vision measurement, telecentric lens design, canrill lens and etc. Want to know more? Please contact us.

Machine Vision Gauging(2021年10月05日)

canrilloptics — 2021-09-18T18:51:36+0900

https://www.canrilloptics.com/machine-vision-gauging.html

Gauging application is to calculate the distance between two or more points on objects to determine whether it meets the requirement by vision system. If not, the failed objects will be ejected from the production line instructed by the system.

Range of the depth of field

If the conditions above are satisfied, the larger the depth of field, the better the far center system's optical characteristics, which can be used as a reference in the selection of the system.

Canrill Optics is a professional optical lens manufacturer, we provide machine vision measurement, telecentric lens design, machine vision optics and etc. Want to know more? Please contact us.

Introduction to Industry Lens Selection and Classification(2021年10月04日)

canrilloptics — 2021-09-18T18:51:04+0900

https://www.canrilloptics.com/introduction-to-industry-lens-selection-and-classification.html
Introduction to Industry Lens Selection and Classification

According to optical characteristics, industry lens can be divided as: fixed focus lens, zoom lens, microscope zoom lens, and telecentric lens.

Ⅱ. Industry lens technology
1. Optical magnification

Optical magnification describes the degree of convergence or divergence of light rays passing through the lens, and the ratio of the imaging size to the actual size of the object.

Optical magnification = image size / actual object size = CCD size / field of view

E.g:

For the lens used on a 1/2" (6.4mmx4.8mm) camera, the imaging range (lateral) is actually 64mm, so the optical magnification of this lens is 6.4mm/64mm, which is 0.1x.

2. Focal length

The focal length refers to the distance from the optical center of the lens (post-optical main point) to the focal point of the imaging surface. After passing through the lens, the parallel light converges at a point, which is the so-called focal point. It is an important performance indicator of the lens. The length of the focal length determines the working distance, imaging size, field of view and depth of field for shooting. The focal lengths of commonly used lenses are 8mm, 12mm, 16mm, 25mm, 35mm, 50mm (75mm).

3. Working distance

Working distance refers to the distance from the first surface of the lens to the object to be imaged. Generally, the working distance of the lens is within a range.

4. Visual field
The lens projects the measured object and its surrounding environment on the camera's image sensor plane, forming a rectangular imaging surface on the image, and the object plane corresponding to the image in the imaging surface is called the visual field.

5. Depth of field

When the lens is sharply focused on an object, it can form a fairly clear image on the image sensor. A certain range of points in front of and behind the axis of the lens on this plane can also form clearer image points. The distance between the two planes is called the depth of field.

6. Field of view

In the optical system, with the lens as the vertex, the angle formed by the two edges of the maximum imaging range of the measured object passing through the lens is called the field of view. The size of the field of view determines the field of view of the lens. The larger the field of view is, the larger the visual field is and the smaller the optical magnification is.

7. Relative aperture

Aperture is a device inside the lens used to control the amount of light passing through the lens and entering the camera chip. The relative aperture refers to the ratio of the entrance pupil diameter to the focal length of the lens (WD/f), which is usually expressed as 1:1.4, 1:1.8, 1:2.0, etc.

8. Aperture scale

Aperture factor is an important internal parameter of the lens. It is the reciprocal of the relative aperture of the lens (f/WD). The larger the nominal value of the aperture scale is, the smaller the actual aperture will be. Generally, lens manufacturers will use the letter F to represent this parameter, and the size of F is usually set by changing the size of the aperture adjusting ring.

9. Optical size

Generally, it refers to the largest image sensor size (diagonal) that can be adapted during lens design, which is described in terms of sensor size, such as 1", 2/3”, 1/2", 1/3", etc. If the sensor size of the camera is larger than the maximum size of the lens design, dark shadows or black corners will be seen at the four corners of the screen.

10. Optical interface

The connection between the camera and the lens is the optical interface of the lens, and the industry has formed a standard specification for the optical interface. For example, CS interface, C interface and F interface. The CS interface can be converted to C interface, but C interface cannot be converted to CS interface. F is a Nikon buckle. In industrial applications, the C interface and CS interface are generally used on small sensor cameras, and the F interface is used on large sensor cameras. In addition, there are commonly used interfaces like M42, M58, M72 for line cameras... As the names suggest, these are threaded ports of a certain diameter.

11. Distortion

Distortion is actually the general term for the inherent perspective distortion of an optical lens, that is, the distortion caused by perspective. This distortion is very unfavorable to the image quality of the photo. This is the inherent characteristic of the lens, so it cannot be eliminated but can only be improved.

12. Circle of confusion

When light rays with parallel optical axes enter the lens, the ideal lens should be where all the light rays are gathered at one point and then spread out in a cone shape. This point where all the light rays are gathered is called the focal point. In front of and behind the focus, the light begins to gather and diffuse, and the image of the point becomes blurred, forming an enlarged circle. This circle is called the circle of confusion.

13. Resolution ratio/Resolving power

Lens resolution ratio, also known as resolution power and resolving power, refers to the ability of the lens to clearly reproduce the details of the subject. The resolution ratio of the lens refers to the number of pairs of black and white lines that can be distinguished within 1mm on the imaging plane, d is the line width, and its resolution ratio is 1/(2d), the unit is "line pairs/mm", for example, the resolution ratio of a certain lens is 120lp/mm.

14. MTF (Modulation Transfer Function)

Different MTF values at the same frequency bring different images.

Canrill Optics is a professional optical lens manufacturer, we provide telecentric design, telecentric lens design, camera lens selection and etc. Want to know more? Please contact us.

Introduction of Machine Vision Inspection Systems(2021年10月03日)

canrilloptics — 2021-09-18T18:50:32+0900

https://www.canrilloptics.com/introduction-of-machine-vision-inspection-systems.html
Introduction of Machine Vision Inspection Systems

With the development of computer technology and fieldbus technology, machine vision has become an indispensable product in modern processing and manufacturing. Machine vision inspection equipment has been widely used in food and beverage, pharmaceutical and chemical plants, electronics manufacturing and automobiles. In many industries such as production and manufacturing, computer products are used to simulate human visual functionality to capture images quickly and accurately. After that, the images are transferred to the processing unit for digital processing and intelligent identification, and finally used for actual inspection, measurement and control, with the characteristics of fast speed, large information capacity, and powerful functions, becoming indispensable products in the modern processing industry.

Nowadays, with the integrated development of computer technology and electronic circuit design, the reliability of machine vision is getting higher and higher.

The machine vision system adopts advanced hardware equipment and reasonable image processing algorithms, so when inspecting photoelectric elements, it can quickly complete the entire inspection process and obtain inspection conclusions in time.

The industrial camera, the core component of the machine vision inspection system, converts the detected target into an image data signal, and transmits it to a dedicated digital image processing system. According to the pixel distribution area, brightness, color and other information, it is converted into a digital data signal. This signal carries out various operations to extract the characteristics of the purpose, and then outputs the result according to the preset tolerance and other necessary conditions, including size, angle, number, pass/fail and presence/absence, to achieve automatic detection functionality.

Canrill Optics is a professional optical lens manufacturer, we provide telecentric design, telecentric lens design, industry lens and etc. Want to know more? Please contact us.

Design Principle and Technical Advantages of Telecentric Lens(2021年10月02日)

canrilloptics — 2021-09-18T18:49:58+0900

https://www.canrilloptics.com/design-principle-and-technical-advantages-of-telecentric-lens.html

The purpose of telecentric lens design is to eliminate the difference in magnification caused by the inconsistency of the distance between the measured object and the lens. According to the classification and design principles of telecentric lenses:

1. The design principle of the object space telecentric light path

The convergent center of the object space chief ray parallel to the optical axis is located infinitely far away from the image space, which is called the object space telecentric light path. Its function is: it can eliminate the reading error caused by inaccurate focusing of the object.

2. The design principle of the image-side telecentric light path

3. The design principle of the telecentric optical path on both sides

It integrates the dual functions of object space/image space telecentricity, and is mainly used in the field of vision measurement and detection. Bi-telecentric lens adopts this principle.

Ⅱ. Technical advantages of telecentric lens

1. High resolution

The image resolution is generally measured by the CTF (contrast transfer function) that quantifies the existing spatial frequency contrast of the image sensor, and the unit is lp/mm. Most machine vision integrators often just gather a large number of cheap low-pixel, low-resolution lenses, and finally can only generate blurred images. With a telecentric lens, even with a small pixel image sensor, high-resolution images can be generated.

2. True telecentric lens design: ultra-wide depth of field and low distortion

There was a view that the telecentric lens mainly solves the distortion problem. In fact, the telecentric lens solves not only the distortion problem, but the low distortion is only an additional attribute of the telecentric lens. The unique optical characteristics of the telecentric lens: when the object moves in the field of view, its magnification in different positions will not change, which determines that it cannot be replaced by ordinary industrial lenses in some fields. For example, its larger depth of field can be well adapted to the working environment on site, which is not a problem that can be solved only by algorithms.

3. Unique parallel light path design

Designing a telecentric lens for parallel-light imaging is not complicated in theory, but it is another matter to achieve a certain resolution and imaging quality. The design and manufacture of a telecentric lens is indeed more difficult than a lens in the general sense. The reason is that the size of the optical lens of the telecentric lens is relatively large, which makes the correction of various phase differences of the edge light more difficult.

Canrill Optics is a professional optical lens manufacturer, we provide telecentric design, telecentric lens design, industry lens and etc. Want to know more? Please contact us.

CANRILL MACHINE VISION APPLICATIONS(2021年10月01日)

canrilloptics — 2021-09-18T18:49:30+0900

https://www.canrilloptics.com/canrill-machine-vision-applications/
CANRILL MACHINE VISION APPLICATION

Guidance application is to locate or report the position and orientation of a part in 2D or 3D space to a machine controller, or alignment and geometric pattern matching.

Inspection application is to detect defects, contaminants, functional flaws, and other irregularities in manufactured products

Identification application is mainly OCR and OCV systems to read or confirm the presence of codes and characters. It can also identify parts by setting specific requirements.

Canrill Optics is a professional lens manufacturer, we provide application of machine vision system, industry lens and etc. Want to know more? Please contact us.