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projection lens

A projection lens and projection technology, applied in the field of projection lenses, can solve the problems of miniaturization, large aperture and large projection ratio at the same time, and achieve the effects of good optical performance and resolution, large projection ratio, and large aperture

Inactive Publication Date: 2019-03-15
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 projection lens with miniaturization, large aperture and large projection ratio for the defects that the projection lens in the prior art cannot simultaneously have miniaturization, large aperture and large projection ratio. , but still has good optical performance and resolution

Method used

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Embodiment Construction

[0038] see figure 1 , figure 1 It is a schematic diagram of lens configuration and optical path according to the first embodiment of the projection lens of the present invention. During projection, the light from the image source IS1 is finally projected on the projection side. The projection lens 1 sequentially includes a first lens group G11 , an aperture ST1 and a second lens group G12 from the projection side to the image source side along the optical axis OA1 . The first lens group G11 has positive refractive power, and the first lens group G11 includes a first lens L11 and a second lens L12 in sequence along the optical axis OA1 from the projection side to the image source side. The first lens L11 is a convex-concave lens with negative refractive power and is made of plastic material. The projection side S11 is convex, the image source side S12 is concave, and both the projection side S11 and the image source side S12 are aspheric surfaces. The second lens L12 is a co...

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Abstract

A projection lens sequentially comprises a first lens group with positive refractive power and a second lens group with positive refractive power along an optical axis from a projection side to an image source side. The second lens group sequentially comprises a third lens with negative refractive power, a fourth lens with positive refractive power, a fifth lens with positive refractive power and a sixth lens with positive refractive power along the optical axis from the projection side to the image source side. The third lens and the fourth lens are glued into a doublet lens which has negative refractive power. The third lens meets the following condition: -0.579<=f3 / f<=-0.4, wherein f3 is the effective focal length of the third 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 project a large-sized image at a short projection distance, the projection lens needs to have a large throw ratio. Therefore, the traditional projection lens can no longer meet the projection lens requirements of miniaturized projectors. A new type of projection lens with miniaturization, large aperture and large throw ratio is required to meet the requirements of miniaturized projectors. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a projection lens ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B13/18G02B13/00G03B21/14
Inventor 王智鹏
Owner SINTAI OPTICAL SHENZHEN CO LTD