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Lens system and lens

A lens system and lens technology, applied in the field of optical instruments, can solve the problems of small lens image surface and inability to achieve constant aperture, and achieve good imaging quality, high cost performance, and improved imaging quality

Active Publication Date: 2018-01-16
ZHEJIANG DAHUA TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Embodiments of the present invention provide a lens system and a lens to solve the problems in the prior art that the image plane of the lens is small and the constant aperture cannot be realized

Method used

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  • Lens system and lens

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no. 1 Embodiment

[0048] The first specific embodiment, the lens system provided by the embodiment of the present invention is such as figure 2 As shown, from the object side to the image side along the optical axis direction, it includes: the first fixed lens group G1 with positive refractive power, the zoom lens group G2 with negative refractive power, an aperture stop, and the first fixed lens group with positive refractive power Two fixed lens groups G3, a focus lens group G4 with positive refractive power, a third fixed lens group G5 with positive refractive power, and color filters, wherein, The first fixed lens group G1 includes from the object side to the image side along the optical axis direction: a meniscus lens L11 with a negative refractive power, a biconvex lens L12 with a positive refractive power, and a meniscus lens L13 with a positive refractive power. Wherein, the surfaces of the meniscus lens L11 and the meniscus lens L13 facing the object side are both convex, and the men...

no. 2 Embodiment

[0071] In the second specific embodiment, the lens system provided in the embodiment of the present invention is such as Figure 7 As shown, the first fixed lens group G1 with positive refractive power, the zoom lens group G2 with negative refractive power, the aperture stop, the second fixed lens group G3 with positive refractive power, and the lens group G3 with positive refractive power The focusing lens group G4, the third fixed lens group G5 with positive refractive power and the color filter, wherein,

[0072] The first fixed lens group G1 includes from the object side to the image side along the optical axis direction: a meniscus lens L11 with a negative refractive power, a biconvex lens L12 with a positive refractive power, and a meniscus lens L13 with a positive refractive power. Wherein, the surfaces of the meniscus lens L11 and the meniscus lens L13 facing the object side are both convex, and the meniscus lens L11 , the biconvex lens L12 and the meniscus lens L1...

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Abstract

The invention discloses a lens system and a lens to solve problems that in the prior art, the image plane of the lens is small, and a constant diaphragm cannot be realized. The lens system comprises afirst fixed lens combination, a zooming lens combination, an aperture diaphragm, a second fixed lens combination, a focusing lens combination, and a third fixed lens combination in sequence along anoptical axis from an object side to an image side, the change of the focal length of the lens system is realized through the position change of the zooming lens combination and the focusing lens combination along the direction of the optical axis, and the focal length f2 of the zooming lens combination, the focal length f3 of the second fixed lens combination, the focal length f4 of the focusing lens combination, the short focal length fw of the lens system, and the long focal length ft of the lens system satisfy conditions shown in the description, wherein a, b, c, d, e and f are constants. According to the lens system and the lens, the dimension of the image plane of the lens combination is greater than a set value, and the diaphragm of the lens combination is constant.

Description

technical field [0001] The invention relates to the field of optical instruments, in particular to a lens system and a lens. Background technique [0002] The lens is the eye of the security system, which is used to collect the reflected light of the object to be photographed, and focus the reflected light on the image sensor in the camera to obtain the image of the object to be photographed. Therefore, the performance of the lens has a great impact on the object to be photographed. The quality of the image is greatly affected, thus affecting the accuracy of the security monitoring results. At present, the aperture of the lens used in the security industry and the image plane of the object to be photographed are small, and a constant aperture cannot be achieved, which affects the image quality of the object to be photographed. [0003] In order to improve the image quality of the object captured by the lens, a single-lens reflex camera lens is used for security monitoring i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B15/173
CPCG02B15/145129G02B15/15
Inventor 胡长涛刘凯林法官丁洪兴
Owner ZHEJIANG DAHUA TECH CO LTD
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