Transmitted Lighting: The "Secret Weapon" of Visual Inspection

In the field of visual inspection, lighting methods are a profound subject.This time, let's take an in - depth look at transmitted lighting and discover its magical features.

Transmitted lighting, simply put, means placing the light source below the product.

When the light is emitted, it refracts through the object. Then, the outgoing light rays can pass through transparent or semi - transparent objects and accurately illuminate the target. Common items such as glass products and color filters are suitable for this lighting method.

In practical visual inspection scenarios, transmitted lighting is widely used, especially in surface finish inspection and transparent object inspection, where it is truly a "miracle tool". The principle behind it is quite interesting. When the incident light encounters a flat surface area, the outgoing light rays do not enter the lens. As a result, this part appears relatively dark in the image. However, when the light hits an uneven surface area, the outgoing light rays are reflected into the lens, creating a brighter area in the image. In this way, the defects on the product surface are clearly revealed, making them hard to miss.

Take the scratch inspection of mobile phone camera lenses as an example. Mobile phone camera lenses are made of transparent glass sheets, and their surfaces are convex in the middle and concave at the edges, with an irregular shape.

If ordinary lighting methods are used, scratches on the lens may be difficult to detect and are easily interfered by other factors. But with the help of transmitted lighting, all problems are solved. It can clearly highlight the scratches on the lens surface. The entire inspection process is free from unnecessary interference, allowing inspectors to easily spot even the slightest defects, greatly improving the accuracy and efficiency of inspection.

In visual projects, the choice of lighting method is of great significance. Different lighting methods are suitable for different inspection requirements, and transmitted lighting is just one of them. If you can master various lighting techniques proficiently and apply them flexibly according to the actual situation, you are already halfway to success in visual projects. I hope everyone can attach importance to the lighting link, continuously explore the mysteries of different lighting methods, and make visual inspection work more efficient and accurate.

Okay, that's all for today's sharing about transmitted lighting! I believe you all have a new understanding of this magical "tool" for visual inspection. But don't go away just yet, there are more surprises waiting for us in the world of lighting in visual inspection. In the next issue, we will focus on the practical topic of "front - side reflection", revealing how to skillfully use light reflection to make product details fully visible. Friends who are interested, remember to lock in for the update. See you then!

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