Low-cost ultra-large-aperture object space telecentric optical system

Abstract

The invention discloses a low-cost ultra-large-aperture object space telecentric optical system. The system comprises an object plane, a Fresnel lens, an aperture diaphragm, a non-telecentric finite distance imaging system and an image plane which are arranged on the same ray, the object plane is used for receiving incident light, the incident light received by the object plane sequentially passesthe Fresnel lens, the aperture diaphragm and the non-telecentric finite distance imaging system to be imaged on the image plane, and the non-telecentric finite distance imaging system includes a CCTVlens, an FA lens or a camera lens. When the aperture of the lens is larger than 300, the Fresnel lens can be used for replacing a lens with the ultra-large aperture, and in the production and manufacturing process, the Fresnel lens with the ultra-large aperture is easier to produce than the a common lens, and time is much shorter; in the aspect of weight, the Fresnel lens is relatively light; inthe aspect of precision, the precision is slightly lower than common precision. Generally speaking, in the large-aperture telecentric system, the Fresnel lens is used, so that the cost of the large-caliber telecentric system can be reduced.

Description

technical field [0001] The invention relates to a low-cost super-large-diameter object-space telecentric optical system, which belongs to the technical field of optical systems. Background technique [0002] So far, with the wide application of machine vision systems in the field of precision inspection, ordinary industrial lenses are difficult to meet the inspection requirements. In order to make up for the shortcomings of ordinary lenses and meet the needs of precision inspection, telecentric lenses have emerged as the times require. Due to its unique parallel optical path design, telecentric lenses have always been favored by machine vision applications that require high lens distortion. [0003] The object-space telecentric system can keep the magnification of the obtained image unchanged within a certain range of object distance, which is a very important application when the measured objects are not on the same object plane. [0004] At the same time, limited by the p...

AI Technical Summary

Problems solved by technology

But to manufacture a super-large-diameter lens, the manufacturing process is complicated, requires high technology, and takes a lot of time, and the lens itself is heavy. In other words, the cost of manufacturing a super-large-diameter lens is high, the cycle is long, and the weight is heavy

For example, refer to the invention patent with application number 201510443280.8. When the diameter of the first lens is greater than 300, the manufacturing cost of the lens is high, the weight is heavy, and the manufacturing process is complicated.

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