Ultra wide-angle lens

Abstract

A super-wide-angle lens system for imaging an object on an imaging surface, includes a first lens group with negative refraction power and a second lens group with positive refraction power. The first lens group includes a first spherical lens with negative refraction power, a second spherical lens with negative refraction power, and a third spherical lens with positive refraction power. The first lens has a first surface facing the object side of the first lens group. The second lens group includes a fourth spherical lens with positive refraction power and a fifth spherical lens with negative refraction power. The system satisfies the formulas: 0.01<D / |FG1|<1, and 2<D / FG2<4, where D is the distance from the first surface to the imaging surface, FG1 is the effective focal length of the first lens group, and FG2 is the effective focal length of the second lens group.

Description

technical field [0001] The invention relates to a lens, in particular to a super wide-angle lens. Background technique [0002] The viewing angle of traditional ultra-wide-angle lenses for vehicles is required to be above 90 degrees, and images captured by ultra-wide-angle lenses usually have serious imaging distortion on the screen. Therefore, how to design an ultra-wide-angle lens with a wide viewing angle and without serious distortion of imaging has become a research direction for engineers and technicians in this technical field. In order to reduce imaging distortion, aspheric lenses are generally used to replace spherical lenses in the design process of ultra-wide-angle lenses. However, the production cost of aspheric lenses is relatively high, which is not conducive to saving production costs. Contents of the invention [0003] In view of this, it is necessary to provide an ultra-wide-angle lens with high projection quality and low cost. [0004] A super wide-angl...

AI Technical Summary

Problems solved by technology

In order to reduce imaging distortion, aspheric lenses are generally used to replace spherical lenses in the design process of ultra-wide-angle lenses. However, the production cost of aspheric lenses is relatively high, which is not conducive to saving production costs

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