What is a coaxial light telecentric lens?

Coaxial light lens is a lens with coaxial falling light illumination technology. The coaxial light source provides more uniform illumination than the traditional light source, which can detect the defects of the object more clearly, with a clearer image and a more uniform picture, and improve the accuracy of the machine vision system.

Coaxial light telecentric lens advantage:

1. High image quality: characterized by high depth of field, high resolution and low distortion, it can make the obtained image magnification not change within a certain object distance, which is conducive to the clear imaging of different positions and heights of the workpiece, and can reduce the focusing error and the influence of stray light, which is very important for the situation that the object to be measured is not on the same object surface.

2. Can highlight the characteristics of the object: its special optical design can screen the light coaxial with the camera, through the contrast between light and dark, highlight the characteristics of the object under test, help the vision system to capture the product defects, so that the machine vision inspection is more convenient and efficient. For example, it can clearly show the small defects on the glass, with high detection efficiency; shoot barcode characters clearly, with high contrast and invisible change; in the PCB guide positioning system, it can make the product image clearly observed within a certain height, to ensure the stability and reliability of the system.

3. Uniform illumination: With coaxial falling light structure, the illumination is uniform, which makes the concave and convex effect more obvious. For example, Kohler lighting telecentric lens after special optical design, eliminating the stray light generated inside the lens, so that the illumination light is parallel out, the illumination spot is more uniform than the ordinary coaxial telecentric lens, not only saves the space occupied by the external coaxial light source, while at the same time can achieve the same uniformity of the effect.

4. High light collimation: especially suitable for high-precision direct light measurement and detection of fine scratches and dirt on the surface of highly reflective objects.

5. No stray light interference: the use of special optical design and internal structure can minimize the internal light reflection problems of ordinary internal coaxial illumination lenses and improve the imaging quality.

6. Wide range of applications: widely used in industrial visual inspection, automation, semiconductor, electronics industry, geological analysis, educational experiments and other fields, such as smooth object scratch detection, wafer surface detection, character recognition, ITO film detection, PCB board detection, etc..