Telecentric lenses play an important role in machine vision systems by providing features such as high precision parallel beams, high imaging quality and stable imaging position. Many requirements need to be considered in the design.
1. The telecentric lens needs to have the performance of correcting aberration. As the telecentric lens uses the imaging principle of a finite far position, it is necessary to correct aberrations, including spherical aberration, coma aberration, dispersion, etc., in order to ensure that the object photographed by the clarity of the picture and colour reproduction. In addition, factors such as lens aberration and distortion also need to be considered to ensure the quality and accuracy of the captured image.
2. The structure of the telecentric lens must be solid, there can be no lens shake phenomenon, and the light must be parallel after the object distance, in order to avoid image distortion due to light refraction and scattering and other reasons. In order to meet this requirement, telecentric lenses are usually designed with a fixed focal length, and the aperture of the lens should be large enough to provide sufficient depth of field and sharpness.
3. Telecentric lenses require the use of high transmittance lenses to ensure the clarity and brightness of the shooting picture. Usually low dispersion, low absorption, high transmission ratio of glass materials to manufacture lenses to improve the brightness and clarity of the picture.
4. Telecentric lenses need to have a wide field of view to meet the needs of a wide range of shooting. In order to achieve this requirement, telecentric lenses are usually designed with multiple lenses to increase the field of view. In addition, you also need to consider the lens depth of field range and shooting distance and other factors to determine the size of the field of view.
5. Telecentric lenses need to have high resolution and colour reproduction to capture high quality images. In order to achieve high resolution and colour reproduction requirements, telecentric lenses usually use high-quality glass materials to manufacture lenses, and coating technology to reduce reflections and flare and other factors affecting image quality.
6. Telecentric lenses need to be stable and reliable to ensure long-term use and high-precision measurement. Telecentric lenses usually use high-quality materials and strict manufacturing process to ensure its stability and reliability. In addition, rigorous inspection and testing is required to ensure that the precision and quality of the lens meets the requirements.
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