Wide-angle lens and imaging equipment

Abstract

The invention discloses a wide-angle lens and an imaging device. The wide-angle lens includes sequentially from the object side to the imaging surface along the optical axis: a first lens with negative optical power, the object side surface is convex and the image side surface is concave; The second lens of high degree, its object side is concave, the image side is convex; diaphragm; the third lens with positive refractive power, its object side is convex, the image side is concave; the fourth lens with positive refractive power, its The object side is convex and the image side is convex; the fifth lens with negative refractive power is concave on the object side and the image side is concave; the sixth lens with positive refractive power is convex on the object side and convex on the image side ; A seventh lens with negative refractive power, the object side is convex at the near optical axis and has an inflection point, and the image side is concave at the near optical axis and has an inflection point. The wide-angle lens at least has the advantages of large aperture, large angle of view, high pixel, miniaturization, good thermal stability and low cost.

Description

technical field [0001] The invention relates to the technical field of imaging lenses, in particular to a wide-angle 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 relatively small apertures, and most of the apertures F# are above 2.0, resulting in poor imaging effects and low resolution of such lenses in strong light and low-light environments, which cannot meet the needs of indoor and outdoor applications. Day a...

AI Technical Summary

Problems solved by technology

[0003] At present, most of the surveillance lenses popular in the market have relatively small apertures, and most of the apertures F# are above 2.0, resulting in poor imaging effects and low resolution of such lenses in strong light and low-light environments, which cannot meet the needs of indoor and outdoor applications. Day and night high-definition imaging requirements under complex ambient light; some surveillance lenses have a small field of view, making it 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 all-glass The lens made of different materials makes the cost of the lens higher and the size is larger, which is not conducive to the promotion and application in the market

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