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Lens

A lens and lens technology, applied in the lens field, can solve problems such as low resolution and small aperture, achieve good image quality and reduce the total optical length

Active Publication Date: 2020-01-10
ZHEJIANG DAHUA TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The embodiment of the present invention provides a lens to solve the problems of the prior art in the lens target size, smaller aperture, and lower resolution

Method used

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Embodiment 1

[0106] In the specific implementation process, the curvature radius R, central thickness Tc, refractive index Nd, and Abbe constant Vd of each lens of the lens meet the conditions listed in Table 1:

[0107]

[0108]

[0109]

[0110] Table 1

[0111] The lens provided in Embodiment 1 has the following optical technical indicators:

[0112] Optical total length TTL≤119mm;

[0113] Lens focal length f': 16(W)—60(T)mm;

[0114] Field of view of the lens: 31.2°(W)—8.5°(T);

[0115] Optical distortion of the lens: -2.7% (W)—-0.43% (T);

[0116] Aperture F / # of the lens system: F1.4;

[0117] Lens image size: 1 / 1.8".

[0118] Note: W means short focus, T means telephoto.

[0119] The imaging system provided by this embodiment will be further introduced below through detailed analysis of the embodiment.

[0120] The optical transfer function is a more accurate, intuitive and common way to evaluate the imaging quality of an imaging system. The higher the curve and the...

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Abstract

The invention discloses a lens. In the embodiment of the invention, four lens groups are sequentially arranged in the lens according to a special sequence from an object side to an image side, the lens groups in the lens conforms to the conditions as follows: -1.0<=f2 / [(f<W>'*f<T'>)<1 / 2>]<=-0.5, 0.56<=f4 / [(f<W>'*f<T'>)<1 / 2>]<=1.16, and 0.2<=TTL / (BFL*f<W'>)<=0.5. The target size and aperture of thelens are improved to a certain extent, thus, the acquired image is relatively high in resolution, the transmittance quality of the lens can be enabled to be ensured under a low-illumination scene, the acquired image quality is relatively good, and the optical total length of the lens is reduced. Therefore, the embodiment of the invention provides a continuous zooming optical imaging lens which islarge in target, extra-large in aperture and high in resolution.

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 and small in target size, resulting in low resolution of the collected image...

Claims

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Application Information

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IPC IPC(8): G02B15/177
CPCG02B15/177G02B15/144109
Inventor 刘凯林法官丁洪兴过程杜艳芬
Owner ZHEJIANG DAHUA TECH
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