projection lens

A projection lens and projection technology, applied in the field of projection lenses, can solve the problems of miniaturization, large aperture and variable focal length at the same time

Active Publication Date: 2021-04-27
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 projection lens with a smaller lens size and a smaller aperture value in view of the defects that the projection lenses in the prior art cannot meet the requirements of miniaturization, large aperture and variable focal length at the same time , with zoom function, but still has good optical performance

Method used

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Embodiment Construction

[0035] see figure 1 and figure 2 , figure 1 It is a schematic diagram of the lens configuration and optical path at the wide-angle end of the first embodiment of the projection lens according to the present invention, figure 2 It is a schematic diagram of the lens configuration and optical path at the telephoto point of the first embodiment of the projection lens according to the present invention. During projection, the light from the image source IS1 is finally projected on the projection side. The projection lens 1 includes the first lens group G11, the second lens group G12, the third lens group G13, the aperture ST1, the fourth lens group G14, and the fifth lens group G15 from the projection side to the image source side along the optical axis OA1. , a sixth lens group G16, a glass plate PG1, a prism P1 and a protective glass CG1. When in use, the distance D1 between each lens group between the first lens group G11 and the image source IS1 45 , D1 89 , D1 1011 、D...

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Abstract

The invention relates to a projection lens, which sequentially includes a first lens group, a second lens group, a third lens group, a fourth lens group, a fifth lens group and a sixth lens along the optical axis from the projection side to the image source side group. The first lens group has negative refractive power, including the first lens, the second lens group has positive refractive power, the third lens group has positive refractive power, the fourth lens group has negative refractive power, the fifth lens group has positive refractive power, and the sixth lens group has Positive refractive power, where the projection lens meets the following conditions: 0.4<R 12 / f<2.5; R 12 is the curvature radius of the image source side of the first lens, and f is the effective focal length of the projection lens.

Description

technical field [0001] The invention relates to a projection lens. Background technique [0002] Traditional projectors are large in size and not easy to carry. In recent years, projectors have been gradually miniaturized for portability, and the projection lenses used therein have to be miniaturized accordingly. In addition, in order to increase the brightness of the projector, the projection lens needs to have a larger aperture. On the other hand, in order to adjust the projection size without moving the projector position, the projection lens needs to have a zoom function. Therefore, the traditional projection lens can no longer meet the demand, and a projection lens design with another structure is needed to meet the requirements of miniaturization, large aperture and variable focal length at the same time. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a projection lens with a smaller lens size and a smal...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B15/177G03B21/14
CPCG02B15/177G03B21/14
Inventor 孙嘉鸿
Owner SINTAI OPTICAL SHENZHEN CO LTD
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