Large-aperture glass-plastic hybrid zoom lens

Abstract

The invention provides a large-aperture glass-plastic hybrid zoom lens which comprises a compensation group and a zoom group. Total focal power of the compensation group is negative, the total focal power of the zoom group is positive, and zooming is realized by changing the interval between the compensation group and the zoom group; the compensation group comprises a first lens with convex-concave negative focal power, a second lens with biconcave negative focal power, a third lens with convex-concave negative focal power and a fourth lens with convex-concave positive focal power which are sequentially arranged along the incident direction of light; the zoom group comprises a fifth lens with double convex positive focal power, a sixth lens with double concave negative focal power, a seventh lens with convex-concave positive focal power, an eighth lens with double convex positive focal power, a ninth lens with double convex positive focal power and a tenth lens with convex-concave negative focal power which are sequentially arranged along the incident direction of light. By using a mixed structure of the glass spherical surface and the plastic aspheric surface, the focal power is reasonably distributed, the excellent performance of no defocusing under the high and low temperature environment of -40 DEG C to 85 DEG C is realized, and large aperture and low cost are both taken into consideration.

Description

technical field [0001] The invention relates to the field of security intelligent monitoring and artificial intelligence, in particular to a large-aperture glass-plastic hybrid zoom lens. Background technique [0002] Due to the rapid popularization of video surveillance, many video surveillance applications urgently need a rapid identification technology in the non-cooperative state of the user, in order to quickly confirm the identity of personnel and realize intelligent early warning. Face recognition technology is undoubtedly the best choice. Using fast face detection technology can find faces in real time from surveillance video images and compare them with face databases in real time to achieve fast identity recognition. [0003] The first step in face recognition is image acquisition. Image acquisition is inseparable from the lens, and a zoom lens with a large aperture is particularly important. At the same time, the traditional zoom lens generally adopts an all-glas...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a glass-plastic hybrid zoom lens with a large aperture, which uses a glass-plastic hybrid structure to overcome the waste of resources and achieve large aperture zoom, which can cope with shooting tasks at various distances and in various environments, especially sudden In the case of harsh environment and insufficient external fill light, it can shoot high-definition picture quality

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