Optical lens and imaging equipment

Abstract

The invention discloses an optical lens and an imaging device. The optical lens comprises in sequence from the object side to the imaging surface along the optical axis: a first lens with negative refractive power, the object side is a convex surface, and the image side is a concave surface; ; a second lens with positive power, the object side is convex at the near optical axis, and the image side is convex; a third lens with positive power, the object side is concave, and the image side is convex; The fourth lens has a concave surface on the object side and a convex surface on the image side near the optical axis; wherein, the first lens, the second lens and the fourth lens are all plastic aspheric lenses, and the third lens is a glass lens. The optical lens has at least the advantages of small size, wide viewing angle, high pixel, day and night confocal, and relatively low cost.

Description

technical field [0001] The invention relates to the technical field of imaging lenses, in particular to an optical lens and imaging equipment. Background technique [0002] With the gradual expansion of the application range and scenarios of security monitoring video technology, and the increasing requirements for high-definition, networking, and intelligence of security monitoring, security monitoring lens products are gaining in large field of view, high-definition image output, and confocal color day and night. The technical level requirements for imaging and overcoming the impact of harsh environments on imaging quality are also increasing. [0003] At present, most of the surveillance lenses popular in the market have small field of view angles, and it is difficult to obtain imaging images in a large field of view, which cannot meet actual needs; there are also many surveillance lenses with a large number of lenses, or even lenses made of all-glass materials. The cost ...

AI Technical Summary

Problems solved by technology

[0003] At present, most of the surveillance lenses popular in the market have small field of view angles, and it is difficult to obtain imaging images in a large field of view, which cannot meet actual needs; there are also many surveillance lenses with a large number of lenses, or even lenses made of all-glass materials. The cost of the lens is high and the volume is large, which is not conducive to popularization and application in the market

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