How to Inspect Auto Parts with Telecentric Lens?

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If you work in the automotive industry, you know how important it is to inspect auto parts for quality and accuracy. You need to make sure that the parts are free from defects, such as crooked pins or holes that are out of shape or size. You also need to measure the dimensions of the parts precisely and consistently.

 

But how can you do that with a regular industrial lens? A normal lens will distort the image of the part, especially at the edges of the field of view. This will affect your measurement accuracy and reliability. You will also have problems with depth of field, which means that some parts of the image will be blurry or out of focus, or can not be that accurate, nor precise.

 

That’s why you need a telecentric lens. A telecentric lens is a special type of lens that eliminates distortion and provides a uniform magnification across the entire field of view. It also has a large depth of field, which means that all parts of the image will be sharp and clear.

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Theory of Telecentric Lens Used for Auto Parts Inspection

A telecentric lens works by having its entrance pupil at infinity. This means that only rays that are parallel to the optical axis can enter the lens. This ensures that all objects in the scene appear at the same size regardless of their distance from the lens.

There are different types of telecentric lenses, but for auto parts inspection, a bi-telecentric lens would be a better choice. A bi-telecentric lens has both its entrance pupil and exit pupil at infinity. This means that it also eliminates perspective errors and magnification changes caused by variations in camera position or sensor size.

A bi-telecentric lens is ideal for high-precision workpiece appearance inspection and size measurement. It has good uniformity in the center and around the field of view and has extremely low distortion imaging.

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Recommended Telecentric Lens Solution in the Auto Parts Industry

One example of a bi-telecentric lens that is suitable for auto parts inspection is DTCM230-190H-AL from Vicoimaging. This lens has a large field of view (145*100mm) and can be paired with a 2/3″ 5MP camera and telecentric illumination for high resolution imaging.

Detection Object

  • Auto Parts Pin Detection

Testing Requirements

  • Alibity to check the pins are missing and crooked
  • Support camera model KEYENCE 2100W
  • High precision is needed

Chanllenges in Detection

  • To check alignment among multiple pins
  • To capture high resolution image under the complex auto-manufacturing environment where there are multiple fast moves in the X and Y axis directions 

Imaging Inspection Solution

COOLENS Bi-Telecentric Lens
DTCM430-80H-AL

Blue Bar Light Source
 
KEYENCE 2100W Camera
 

With this lens, you can inspect auto parts such as pins or holes easily and accurately. You can use a surface light to illuminate the part evenly and capture clear images without shadows or reflections.

MEASURED RENDERINGS

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Final Thoughts

As you can see, using a bi-telecentric lens for auto parts inspection can save you time and money by improving your quality control process. You can avoid errors, rework, waste, and customer complaints by ensuring that your products meet your standards.

If you want to learn more about how to inspect auto parts with telecentric lenses, please visit this article for more information.

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