Zoom lens

A zoom lens and zoom lens technology, applied in the field of zoom lens, to achieve the effect of improving safety and authenticity, high resolution and good definition

Active Publication Date: 2018-04-24
JIAXING ZHONGRUN OPTICAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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Experimental program
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Embodiment 1

[0029] Such as figure 1 As shown, the zoom lens involved in this embodiment includes, from the object side to the image side, a focusing lens group G1 with positive refractive power, an aperture stop STP, a zoom lens group G2 with positive refractive power, and a lens group for filtering stray light. The optical filter ICF and the imaging surface IMG on which the light-receiving surface and the protection surface of solid-state imaging elements such as CCD and CMOS are arranged.

[0030] When the object distance changes, adjusting the position of the focusing lens group G1 along the optical axis can realize the focusing of the lens under different magnification or reduction magnifications. The role of the zoom lens group G2 is to reduce or magnify the magnification: when the zoom lens group G2 moves from the object side to the image side along the optical axis, the lens realizes the zooming process from the telephoto end to the wide-angle end; otherwise, the zoom lens group G2...

Embodiment 2

[0046] Such as Figure 4 As shown, the zoom lens involved in this embodiment includes, from the object side to the image side, a focusing lens group G1 with positive refractive power, an aperture stop STP, a zoom lens group G2 with positive refractive power, and a lens group for filtering stray light. The optical filter ICF and the imaging surface IMG on which the light-receiving surface and the protection surface of solid-state imaging elements such as CCD and CMOS are arranged.

[0047] When the object distance changes, adjusting the position of the focusing lens group G1 along the optical axis can realize the focusing of the lens under different magnification or reduction magnifications. The role of the zoom lens group G2 is to reduce or magnify the magnification: when the zoom lens group G2 moves from the object side to the image side along the optical axis, the lens realizes the zooming process from the telephoto end to the wide-angle end; otherwise, the zoom lens group G...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B15/177
CPCG02B15/177
Inventor 诸益炜尚洁阳李长锋盛亚茗张平华
Owner JIAXING ZHONGRUN OPTICAL TECH
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