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Curved-surface reflection type ultra-short focal projection lens

A surface reflection and projection lens technology, applied in the field of short-focus projection, can solve the problems of image deformation brightness, relatively high processing technology requirements, and unevenness, and achieve the effect of increasing the field of view.

Inactive Publication Date: 2015-05-27
SHENZHEN ESTAR DISPLAYTECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the projected image can only reach the screen after reflection, the image is easily deformed and uneven in brightness on the projection screen due to a small error of the mirror. Therefore, the reflective short-focus projection has requirements for the design and processing technology of optical components Relatively high

Method used

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  • Curved-surface reflection type ultra-short focal projection lens

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Embodiment Construction

[0014] See figure 1 , figure 1 It is a structural schematic diagram of an embodiment of the curved surface reflective ultra-short-focus projection lens of the present invention. Such as figure 1 As shown, a curved reflection ultra-short focal projection lens of the present invention includes a rear lens group 11 and a front lens group 12 , wherein the front lens group 12 includes a curved reflection unit 121 .

[0015] In a preferred embodiment of the present invention, the lens rear group 1 is an off-axis short-focus lens composed of multiple different lenses, for example figure 1 As shown, lens rear group 1 is an off-axis short-focus lens composed of 13 lenses.

[0016] In a preferred embodiment of the present invention, the curved reflection unit 12 includes a concave reflector, and the concave reflector has the same main optical axis as the lens rear group 11 . Wherein, the concave reflector may be a spherical mirror or an aspherical mirror. In another preferred embod...

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Abstract

The invention provides a curved-surface reflection type ultra-short focal projection lens. The curved-surface reflection type ultra-short focal projection lens comprises a rear lens set and a front lens set, wherein the front lens set comprises a curved-surface reflection unit. According to the curved-surface reflection type ultra-short focal projection lens, which is disclosed by the invention, the curved-surface reflection unit is arranged on a transmitting path of forward light rays of the front lens set and is used for reflecting light rays emitted by the rear lens set, so that the purpose of ultra-short focal projection is realized, and a field angle is increased.

Description

technical field [0001] The invention relates to the technical field of short-focus projection, in particular to a curved surface reflection type ultra-short-focus projection lens. Background technique [0002] As a branch of display technology, projection display technology has developed rapidly with the advancement of science and technology. In recent years, short-throw projectors have gradually become a hot spot in the domestic projector market. Short-throw projectors have small requirements for distance, and often only need a projection distance of tens of centimeters to project a large picture. The installation of the short-throw projector is also very convenient. It only needs to be placed in front of the projection screen. Compared with conventional projectors, it has the advantages of saving space and being easy to install. Therefore, the short-throw projector is deeply loved by the majority of users in the development. The concept of "short focus" has attracted pe...

Claims

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Application Information

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IPC IPC(8): G02B13/24G02B13/00G02B17/06G03B21/14
CPCG02B13/002G02B13/24G02B17/0615G03B21/142
Inventor 刘美鸿母林
Owner SHENZHEN ESTAR DISPLAYTECH