zoom lens

Abstract

The invention discloses a zoom lens which comprises a focusing lens group, an aperture diaphragm, a zoom lens group, an optical filter and an imaging surface from an object to an image in sequence, wherein the focusing lens group has a negative power; the zoom lens group has a positive focal power; the imaging surface comprises an imaging element. By adopting the zoom lens, 4K ultrahigh definitioncan be met, an infrared confocal requirement can be ensured at different multiplying powers in zooming from a wide angle end to a remote angle end, phase drift compensation can be met, meanwhile clear imaging can be achieved at both a high temperature of 80 DEG C and a low temperature of minus 40 DEG C, and the lens can generally work normally in all temperature environments.

Description

technical field [0001] The invention relates to a technology in the field of optical devices, in particular to a zoom lens. Background technique [0002] In order to satisfy the requirement that the surveillance camera can image clearly at both close-range and long-distance monitoring, the lens of the surveillance camera needs to have an appropriate magnification zoom. Generally speaking, the larger the magnification, the more difficult the design is, and the imaging quality at high magnification is lower. will get worse. While the pixel of the camera is improved, it brings an increase in the number of lenses and an increase in the complexity of the overall structure. High resolution and high pixels often correspond to large size and high cost. Moreover, in order to meet the needs of night monitoring, surveillance cameras also need to have infrared confocal capabilities and certain temperature drift compensation capabilities. Contents of the invention [0003] The presen...

AI Technical Summary

Problems solved by technology

[0003] The present invention aims at the defect that the current zoom lens used for monitoring cameras can not be taken into account in terms of external dimensions, cost, imaging quality, infrared confocal, temperature drift compensation, focal length and many other constraints that affect the quality of the lens, and proposes a zoom lens The lens, through special optical lens matching and surface shape optimization, can meet 4K ultra-high-definition resolution, and all magnifications can guarantee infrared confocal when zooming from the wide-angle end to the telephoto end. Clear imaging at -40°C

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