Turn-back type telecentric lens

Abstract

The invention discloses a turn-back type telecentric lens. The telecentric lens comprises an object space, a first lens group, a semi-transparent and semi-reflective flat mirror, a second lens group,an aperture diaphragm, a third lens group and an image plane sequentially arranged from left to right and in the same ray. The invention has the advantages that 1, the turn-back type telecentric lensis flexible, the number of mechanical parts and optical parts can be effectively reduced, the production cost is effectively reduced, and the imaging performance is higher; 2, the weight of the turn-back type telecentric lens is greatly reduced, the telecentric lens is flexible and convenient when being carried or used for shooting , the image quality is excellent, and spherical aberration and other aberrations are corrected; and 3, the turn-back type telecentric lens comprises three lens groups, so that the assembly accuracy is improved.

Description

technical field [0001] The invention relates to a turn-back telecentric lens, which belongs to the technical field of optical lenses. Background technique [0002] In recent years, telecentric lenses have been used more and more widely. According to their unique optical characteristics: high resolution, ultra-wide depth of field, ultra-low distortion, and unique parallel light design, etc., it brings quality to the precision inspection of machine vision. Leap, so very popular. The telecentric lens is mainly designed to correct the parallax of traditional industrial lenses. It can be within a certain range of object distance, so that the magnification of the obtained image will not change. This is very important when the measured object is not on the same object surface. application. Due to its unique parallel optical path design, telecentric lenses have always been favored by machine vision applications that require high lens distortion. However, there is often a key prob...

AI Technical Summary

Problems solved by technology

However, there is often a key problem in the production process of optical technology: the patent application number 201521023792.0 discloses a telecentric lens, which is a typical 4F system, consisting of lens group a, lens group b and a thin diaphragm Component composition; lens group a and lens group b are respectively located on both sides of the thin diaphragm assembly and are assembled and fixed by mechanical devices. The focal length of the front lens group of this telecentric lens is long, the total length of the lens is long, the volume is large, and the weight is heavy

It is inflexible and convenient to shoot and carry in this way, the cost is huge, and the production process is relatively complicated

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