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A lens system and lens

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

Active Publication Date: 2019-09-17
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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  • A 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,

[0049] The first fixed lens group G1 consists of a meniscus lens L11 with negative power, a biconvex lens L12 with positive power and a meniscus lens L13 with positive power from the object side to the image side along the optical axis. 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 and the double-convex l...

no. 2 Embodiment

[0073] 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,

[0074] The first fixed lens group G1 consists of a meniscus lens L11 with negative power, a biconvex lens L12 with positive power and a meniscus lens L13 with positive power from the object side to the image side along the optical axis. 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 L13 are cemented together.

[0075] The zoom lens...

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Abstract

The invention discloses a lens system and a lens to solve the problems in the prior art that the image surface of the lens is small and the constant aperture cannot be realized. The lens system includes sequentially from the object side to the image side along the optical axis: a first fixed lens group, a zoom lens group, an aperture stop, a second fixed lens group, a focusing lens group and a third fixed lens group; wherein the lens The focal length change of the system is realized by the position change of the zoom lens group and the focusing lens group along the optical axis direction, and the focal length f of the zoom lens group is 2 , the focal length f of the second fixed lens group 3 , the focal length f of the focusing lens group 4 , the short-focus focal length f of the lens system w , the telephoto focal length f of the lens system t The following conditions: a, b, c, d, e, and f are constants, so that the image plane size of the lens group is larger than a set value, and the aperture of the lens group 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 Patents(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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