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Lens

A lens and lens technology, applied in the field of lenses, can solve the problems of inability to meet the use of sensors, general image quality, and no zoom lens.

Active Publication Date: 2021-12-03
ZHEJIANG DAHUA TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the field of intelligent transportation, the monitoring range is relatively fixed, generally for intersection and lane monitoring, fixed-focus lenses with a focal length of 12mm and fixed-focus lenses with a focal length of 16mm are used more often, and when different monitoring ranges are to be achieved, 12- 25mm zoom lens or switch between 12mm and 16mm lenses, difficult to use and high cost
But the following problems still exist in the current optical imaging lens: 1. There is no 1-inch 12-16mm zoom lens on the market
2. The existing 12-25mm fixed-focus lens on the market has a large number of lenses and high cost
3. The resolution of the lens is not high, and the image quality is average
4. The target surface of the lens is small, which cannot be used by sensors with a target surface of 1 inch and above
5. Most lenses do not have infrared confocal function

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0088] 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:

[0089]

[0090]

[0091] Table 1

[0092] 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;

[0093] Among them, the variable thickness data is shown in parameter table 2:

[0094] focal length D2 D6 D15 D19 12mm 6.0 4.85 7.02 0.1 16mm 9.85 1.0 0.1 7.02

[0095] Table 2

[0096] The lens provided in this embodiment has the following optical technical indicators:

[0097] Optical total length TTL≤94mm;

[0098] Lens focal length f: 12(W)mm-16(T)mm;

[0099] Field of view of the lens: 78.1°(W)-60.3°(T);

[0100] Optical distortion of the lens: -8.3% (W) -4.9% (T);

[0101] Aperture F...

Embodiment 2

[0105] 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 3:

[0106]

[0107]

[0108] table 3

[0109] It should be noted that the mirror serial numbers in Table 3 are figure 1 In the schematic diagram of the lens structure shown, the surface numbers of the lenses from left to right;

[0110] Among them, the variable thickness data is shown in parameter table 4:

[0111] focal length D2 D6 D15 D19 12.3mm 7.60 4.95 6.72 0.1 15.8mm 9.17 3.38 0.95 5.87

[0112] Table 4

[0113] The lens provided in this embodiment has the following optical technical indicators:

[0114] Optical total length TTL≤94mm;

[0115] Lens focal length f: 12.3(W)mm-15.8(T)mm;

[0116] Field of view of the lens: 70°(W)-53°(T);

[0117] Optical distortion of the lens: -7.6% (W) -4.7% (T);

[0118] Apert...

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Abstract

The invention discloses a lens which is formed by sequentially arranging a first lens group, a second lens group, a third lens group, an aperture diaphragm, a fourth lens group, a fifth lens group, an optical filter and an image plane from an object side to an image side. The lens group satisfies 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. [0003] In the field of intelligent transportation, the monitoring range is relatively fixed, generally for intersection and lane monitoring, fixed-focus lenses with a focal length of 12mm and fixed-focus lenses with a focal length of 16mm are used more often, and when different monitoring ranges are to be achieved, 12- It is difficult to use the 25mm zoom lens or switch between 1...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B15/167G02B15/14G02B13/18
CPCG02B15/167G02B15/145G02B15/1455G02B13/18
Inventor 邢圆圆刘凯丁洪兴郭安峰
Owner ZHEJIANG DAHUA TECH CO LTD