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A focus-free projection objective lens and projector based on wavefront coding

A technology of projection objective lens and wavefront coding, applied in the field of non-focusing projection objective lens, can solve the problems of increasing the projection distance range of imaging lens, etc., and achieve the effects of simple structure, low manufacturing cost and high uniformity

Active Publication Date: 2018-02-27
ZHEJIANG CRYSTAL OPTECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the imaging system of this invention needs to go through an additional digital image restoration algorithm to finally obtain a clear image, and it only expands the depth of field of the imaging system, and does not significantly increase the projection distance range of the imaging lens.

Method used

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  • A focus-free projection objective lens and projector based on wavefront coding
  • A focus-free projection objective lens and projector based on wavefront coding
  • A focus-free projection objective lens and projector based on wavefront coding

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Embodiment Construction

[0031] Below in conjunction with accompanying drawing, the present invention will be further described:

[0032] The present invention proposes a focus-free projection objective lens applying wavefront encoding, by introducing an encoding plate with wavefront encoding on the diaphragm surface of the traditional projection objective lens, which greatly extends the projection of the projector into a clear image distance range, and the structure of the system is simple.

[0033] figure 1 It is a LCOS focus-free miniature projection light engine, which is composed of LED light source 11, collimator lens and relay lens group 12, micro-display chip LCOS21, PBS prism 22, and focus-free projection objective lens 23. The light emitted by the LED passes through the collimator The straight mirror and the relay lens group are incident on the LCOS micro-display chip to light up the image of the LCOS chip. Finally, the image on the LCOS is magnified and imaged by the focus-free projection ...

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Abstract

The invention discloses a wavefront coding based focus-free projection lens and a projector, comprising a coding plate and a projection lens module. The projection lens module magnifies an object to form an image. The attained image undergoes wavefront coding through the coding plate so that the image is made clear within a great projection distance range while the focus is not adjusted. Compared with a conventional projection lens, the back focal length or the focal length of the focus-free projection lens does not have to be adjusted, and an extra electronic correction system is not needed. A wavefront coding plate is enough, making the structure of the free focus projection lens simpler and making the focus-free projection lens attain clear images at a great projection distance. The entire projection lens system has a simple structure and a compact size. Cost-effective to make, the focus-free projection lens also has the advantages of high optical efficiency, high uniformity, high contrast,no radiation and environmental friendliness. The focus-free projection lens is suitable for scale production.

Description

technical field [0001] The invention belongs to the technical field of projection display, in particular to a focus-free projection objective lens based on wavefront coding. Background technique [0002] The principle of the projector displaying images is to first irradiate the light on the image display unit to generate the image, and finally project it on the screen through the projection objective lens, and a certain distance will be kept between the projection objective lens and the screen. The picture is bigger. A general fixed-focus lens can only form a clear picture of a specific size at a specific distance. To obtain a clear picture of other sizes, it is necessary to choose a suitable projection lens. Clear imaging inside, suitable for most users, is one of the main points of projection lens research. At present, traditional projectors generally increase the projection distance range of the system to form a clear image by adjusting the position of the back focal pl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B13/00G02B27/00G03B21/14
CPCG02B13/00G02B27/0025G03B21/147
Inventor 张文字张丽周建军
Owner ZHEJIANG CRYSTAL OPTECH