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Lens

A lens and lens technology, applied in the field of lenses, can solve the problems of general image quality, small aperture of zoom lens, and low resolution of the lens.

Active Publication Date: 2021-12-10
ZHEJIANG DAHUA TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the following problems still exist in the current optical imaging lens: 1. The existing zoom lens has a small imaging target surface size and low resolution of the collected image
2. The aperture of the zoom lens is small. In the case of low illumination, the camera image is very dark, which reduces the adaptability of the product
3. The number of lenses used is large, and the size of the lens is large, so that the entire camera cannot be miniaturized.
4. The resolution of the lens is not high, and the image quality is average
5. Most lenses do not have infrared confocal function

Method used

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Experimental program
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Effect test

Embodiment 1

[0102] In the specific implementation process, the curvature radius R, central thickness Tc, refractive index Nd, Abbe constant Vd and conic coefficient k of each lens of the lens meet the conditions listed in Table 1:

[0103]

[0104]

[0105] Table 1

[0106] It should be noted that the mirror serial numbers in Table 1 are figure 1 In the schematic diagram of the lens structure shown, the surface numbers of the lenses from left to right;

[0107]Wherein, the eighth positive refractive power lens L41 in the embodiment of the present invention is an aspheric lens.

[0108] The aspherical conic coefficient can be defined by the following aspheric formula, but not limited to the following representation:

[0109]

[0110] Among them, Z is the axial sagittal height of the aspheric surface in the Z direction; r is the height of the aspheric surface; c is the curvature of the fitted sphere, which is the reciprocal of the radius of curvature in value; k is the fitting co...

Embodiment 2

[0125] In the specific implementation process, the curvature radius R, central thickness Tc, refractive index Nd, Abbe constant Vd and conic coefficient k of each lens of the lens meet the conditions listed in Table 4:

[0126]

[0127]

[0128] Table 4

[0129] It should be noted that the mirror serial numbers in Table 4 are figure 1 In the schematic diagram of the lens structure shown, the surface numbers of the lenses from left to right;

[0130] Wherein, the eighth positive refractive power lens L41 in the embodiment of the present invention is an aspheric lens.

[0131] The aspherical conic coefficient can be defined by the following aspheric formula, but not limited to the following representation:

[0132]

[0133] Among them, Z is the axial sagittal height of the aspheric surface in the Z direction; r is the height of the aspheric surface; c is the curvature of the fitted sphere, which is the reciprocal of the radius of curvature in value; k is the fitting c...

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Abstract

The invention discloses a lens which is formed by sequentially arranging a first lens group, a second lens group, an aperture diaphragm, a third lens group, a fourth lens group, a fifth lens group and a light splitting device from an object side to an image side. Each light emitting side of the light splitting device sequentially comprises an optical filter and an image surface. The lens groups meet the following conditions: f2 is the focal length of the second lens group, f4 is the focal length of the fourth lens group, fw is the focal length of the lens in a short-focus state, fT is the focal length of the lens in a long-focus state, FOVw is the field angle of the lens in the short-focus state, and FOVT is the field angle of the lens in the long-focus state. A high-resolution lens with a large target surface, a large aperture and low cost is realized.

Description

technical field [0001] The invention relates to the technical field of optical imaging, in particular to a lens. Background technique [0002] Thanks to the rapid development in the field of security monitoring in recent years, optical lenses have been used more and more in the field of security, especially in the fields of intelligent buildings and intelligent transportation, where the pixel requirements of optical imaging lenses are getting higher and higher. More and more companies have begun to invest more in research on UHD, expecting to develop products with higher pixels and smaller sizes. With the rapid development of the security field, the use of zoom lenses is increasing year by year, and the requirements for optical performance and product stability of zoom lenses are also getting higher and higher. However, the following problems still exist in the current optical imaging lens: 1. The existing zoom lens has a small imaging target surface and low resolution of t...

Claims

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Application Information

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IPC IPC(8): G02B15/167G02B15/14G02B13/18
CPCG02B15/167G02B15/145G02B15/1455G02B13/18
Inventor 邢圆圆刘凯郭安峰
Owner ZHEJIANG DAHUA TECH CO LTD
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