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Lens

A lens and lens technology, applied in the lens field, can solve the problems of low magnification, less light transmission through the lens, and difficulty in ensuring image quality, etc., and achieve high-resolution effects

Active Publication Date: 2020-10-02
ZHEJIANG DAHUA TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because the imaging quality of zoom lenses is worse than that of ordinary fixed focal length lenses, the penetration rate of zoom lenses is not high.
Moreover, most of the zoom lenses currently on the market are simple in structure, low in magnification, and low in resolution of the collected images.
Moreover, most of the zoom lenses currently on the market have small apertures, resulting in less light transmission through the lens, and darker images acquired in low-light scenes, making it difficult to guarantee image quality.

Method used

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Experimental program
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Effect test

Embodiment 1

[0084] In the specific implementation process, the radius of curvature R, central thickness Tc, refractive index Nd, and Abbe constant Vd of each lens of the lens system meet the conditions listed in Table 1:

[0085]

[0086]

[0087]

[0088] Table 1

[0089] Among them, the aspherical surfaces corresponding to the 22nd and 23rd surfaces can be expressed as the relationship between the sagittal height Z and the caliber Y, R value, conic coefficient K, and multiple term coefficients A4, A6, A8, A10, A12, A14, and A16:

[0090] Z=[(1 / R) 2 Y] / 1+[1-(1+k)(1 / R) 2 ·Y 2 ] 1 / 2 +A 4 Y 4 +A 6 Y 6 +A 8 Y 8 +A 10 Y 10 +A 12 Y 12 +A 14 Y 14 +A 16 Y 16 ;

[0091] Coefficient of face 15:

[0092] K=-0.03186702; A 4 =-0.00074790105; A 6 = 2.1081527e-006; A 8 =-5.5400683e-007; A 10 = 2.4892986e-008; A 12 =-4.5648822e-010; A 14 = 3.0114377e-012; A 16 = 2.3230487e-015;

[0093] Coefficients for face 16:

[0094] K=-7.835339; A 4 = 0.00041434012; A 6 =-3.43...

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Abstract

The invention discloses a lens. The lens comprises a first lens group, a second lens group, a third lens group, a fourth lens group and an image plane which are sequentially arranged from an object side to an image side, the positions of the first lens group and the third lens group are fixed, and the second lens group and the fourth lens group can move along the optical axis; the lens groups meetthe following conditions: -0.38 <= f2 / ((fw.ft)1 / 2) <= -0.28, and 0.48 <= f4 / ((fw.ft)1 / 2) <= 0.58, wherein f2 is the focal length of the second lens group, f4 is the focal length of the fourth lens group, fw is the system focal length of the lens in a short-focus state, and ft is the system focal length of the lens in a long-focus state. According to the embodiment of the invention, the zoom lenswith large magnification, large aperture and high resolution is realized.

Description

technical field [0001] The invention relates to the technical field of optical imaging, in particular to a lens. Background technique [0002] With the development of society, people's awareness of safety precautions has been continuously improved, and the security monitoring industry has also developed rapidly, and the role of monitoring is becoming more and more important. Zoom lenses have been actually designed and used in the last century. With the development of lens design technology, the application occasions of zoom lenses are gradually increasing. Today, zoom lenses have been widely used in civilian products, security monitoring and other fields. However, because the imaging quality of the zoom lens is worse than that of the ordinary fixed focal length lens, the penetration rate of the zoom lens is not high. Moreover, most of the zoom lenses currently on the market are simple in structure, low in magnification, and low in resolution of the collected images. Moreo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B15/177
CPCG02B15/177
Inventor 刘凯杜艳芬丁洪兴
Owner ZHEJIANG DAHUA TECH CO LTD