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Lens device

A lens, lens technology, used in optical components, optics, instruments, etc., to achieve the effect of large aperture, high resolution, and good optical performance

Active Publication Date: 2020-09-15
SINTAI OPTICAL SHENZHEN CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a lens device with a larger aperture, higher resolution, and function, but still have good optical performance

Method used

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Embodiment Construction

[0053] A lens device provided according to various embodiments of the present invention includes: a first lens group, a second lens group, a third lens group and a fourth lens group. The first lens group includes a first lens with negative refractive power and a second lens with negative refractive power. The first lens includes a convex surface facing the image side and a concave surface facing the object side. The second lens group includes a third lens with positive refractive power, and the third lens includes a convex surface facing the object side. The third lens group includes a fourth lens having positive refractive power. The fourth lens group includes a fifth lens with negative refractive power, a sixth lens with positive refractive power, and a seventh lens with positive refractive power. The seventh lens includes a convex side facing the image side. The first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh le...

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Abstract

A lens device comprises a first lens group, a second lens group, a third lens group and a fourth lens group. The first lens group includes a first lens having negative refractive power and a second lens having negative refractive power. The second lens group includes a third lens having positive refractive power. The third lens group includes a fourth lens having positive refractive power. The fourth lens group includes a fifth lens having negative refractive power, a sixth lens having positive refractive power, and a seventh lens having positive refractive power. The lens device satisfies thefollowing condition: f is the effective focal length of the lens device and is the effective focal length of the first lens group.

Description

technical field [0001] The invention relates to a lens device. Background technique [0002] The development trend of today's projectors, in addition to the continuous development towards high brightness and high resolution, with different application requirements, it is also necessary to have a zoom function, so that the lens device used in it also needs to have a large aperture, high resolution and zoom. Features. Known lens devices can no longer meet today's needs, and another lens device with a new structure is needed to simultaneously satisfy the large aperture, high resolution and zoom functions. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a lens device with a larger aperture, higher resolution, and function, but still has good optical performance. [0004] The technical solution adopted by the present invention for solving the technical problems is to provide a lens device comprising a first lens gr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B15/177
CPCG02B15/177G02B15/144515G02B13/18
Inventor 孙嘉鸿
Owner SINTAI OPTICAL SHENZHEN CO LTD
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