Because optical lens is not very widely used, telecentric lens has always been with mysterious color and is not well known. Here is the design principle of telecentric lens laser lens.
The telecentric lens is specially designed for correcting the parallax of traditional lens. It can make the magnification of the image not change with the change of the object distance within a certain range of object distance, which is very important for the case that the measured object is not on the same surface.
1. The design principle and function of telecentric optical path of object side:
The convergence center of the object's main light parallel to the optical axis's main light is located at the infinite distance of the image square, which is called the object's telecentric light path. Its function is to eliminate the reading error caused by inaccurate focusing.
2. Principle and function of image telecentric optical path design:
The convergence center of the main light of the image square parallel to the main light of the optical axis is located in the infinite distance of the object, which is called the image far center light path. Its function is to eliminate the measurement error caused by the inaccuracy of image focusing.
3. Design principle and function of telecentric optical path on both sides:
It synthesizes the dual functions of object/image telecentricity. It is mainly used in the field of vision measurement and detection.
From the above design principles of various telecentric lenses, it can be seen that telecentric lenses are high-precision lenses designed by taking full advantage of optical imaging characteristics and taking full account of the influence of light in imaging. At present, telecentric lenses have been widely used in the field of machine vision precision measurement and high-precision detection.
Before polishing, it is necessary to determine whether there are scratches or punctures left on the surface of the optical lens after grinding. Whether the size and material of polishing tools are appropriate. Whether the softness, hardness and thickness of asphalt are appropriate. In the polishing process, we must always pay attention to the condition of lens surface and the accuracy inspection. Because the inspection process of lens surface defect is judged by personal vision and method, the inspector should have a deep understanding of scratches and sand hole specifications, and often compare the standard samples of scratches and sand holes to ensure the correctness of inspection.