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Zoom lens, working method thereof and imaging device

A zoom lens and zoom lens technology, applied in the field of optical lenses, can solve the problems that the zoom lens cannot take into account the size, cost, and imaging quality, and achieve excellent infrared confocal performance, improved recognizability and authenticity, and high contrast Effect

Pending Publication Date: 2019-04-26
JIAXING ZHONGRUN OPTICAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the zoom lens used for surveillance cameras cannot take into account many constraints that affect the quality of the lens, such as size, cost, image quality, infrared confocal, temperature drift compensation, and focal length.

Method used

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  • Zoom lens, working method thereof and imaging device
  • Zoom lens, working method thereof and imaging device
  • Zoom lens, working method thereof and imaging device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] figure 1 Schematically provides a simplified structural diagram of the zoom lens in Embodiment 1 of the present invention, as figure 1 As shown, the zoom lens includes:

[0033] A focus lens group with negative power, an aperture stop, a zoom lens group with positive power moving forward and backward along the optical axis of the zoom lens, and a negative power lens group arranged in sequence from the object side to the image side Fixed lens group with optical power, filter for filtering stray light;

[0034] The focal length f of the focusing lens group 1 , the focal length f of the zoom lens group 2 and the focal length f of the fixed lens group 3 satisfy:

[0035] The focal length f of the focusing lens group 1 ∈(-16,-4), the focusing lens group includes:

[0036] The first lens with negative refractive power, the second lens with negative refractive power and the third lens with positive refractive power satisfy: f 1i Be the focal length of the i-th lens...

Embodiment 2

[0044] An application example of the zoom lens and its working method according to the present invention in a surveillance camera.

[0045] Such as figure 2 As shown, in this application example, the focusing lens group includes:

[0046] The first lens L1, the second lens L2, and the third lens L3 are arranged in order from the object side to the image side along the optical axis direction, wherein: the first lens is a glass spherical lens with negative refractive power; the second lens is a focal lens The plastic aspheric lens with negative power; the third lens is a plastic aspheric lens with positive power.

[0047] The zoom lens set includes:

[0048] A fourth lens L4 (that is, the first lens of the zoom lens group), a fifth lens L5 (that is, the second lens of the zoom lens group), and a sixth lens L6 (that is, the second lens of the zoom lens group) are sequentially arranged from the object side to the image side along the optical axis direction. That is, the third ...

Embodiment 3

[0069] An application example of the zoom lens and its working method according to the present invention in a surveillance camera.

[0070] Such as Figure 5 As shown, in this application example, the focusing lens group includes:

[0071] The first lens L1, the second lens L2, the third lens L3 and the fourth lens L4 are arranged in order from the object side to the image side along the optical axis direction, wherein: the first lens is a glass spherical lens with negative refractive power; The lens is a plastic aspheric lens with negative power; the third lens is a glass spherical lens with positive power; the fourth lens is a plastic aspheric lens with negative power;

[0072] The zoom lens set includes:

[0073] The fifth lens L5 (that is, the first lens of the zoom lens group), the sixth lens L6 (that is, the second lens of the zoom lens group), and the seventh lens L7 (that is, the second lens of the zoom lens group) are sequentially arranged from the object side to th...

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Abstract

The invention provides a zoom lens, a working method thereof and an imaging device, wherein the zoom lens comprises a focusing lens group with negative optical power, a diaphragm, a zoom lens group with positive optical power and moving in the positive and reverse directions of the optical axis of the zoom lens, a fixed lens group with negative optical power and a light filter which are sequentially arranged from an object side to an image side; the focal length f1 of the focusing lens group, the focal length f2 of the zoom lens group and the focal length f3 of the fixed lens group satisfy therequirements shown in the description. The zoom lens has the advantages of full-range infrared focusing, no virtual focus at high and low temperatures and the like.

Description

technical field [0001] The invention relates to an optical lens, in particular to a zoom lens, a working method thereof, and an imaging device. 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. [0003] At present, zoom l...

Claims

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Application Information

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IPC IPC(8): G02B15/177
CPCG02B15/177
Inventor 张平华胡侃杰张杰厉冰川尚洁阳张思慎
Owner JIAXING ZHONGRUN OPTICAL TECH
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