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Fixed focus projection lens

A projection lens and fixed-focus technology, applied in optics, instruments, optical components, etc., can solve the problems of increasing the complexity of engineering design and cost, and achieve the effect of short total length and simplified lens barrel structure

Active Publication Date: 2009-02-04
ASIA OPTICAL CO INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

From the above, it can be seen that when both groups are moving, the lens barrel of the projection lens must be designed with rather complicated cam grooves and cam barrels, and such a design will undoubtedly increase the complexity of engineering design and the difficulty and cost of manufacturing

Method used

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  • Fixed focus projection lens
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  • Fixed focus projection lens

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Embodiment Construction

[0032] The fixed-focus projection lens of the present invention can be installed on the projector, and is used for display assembly, as the image projection on the digital micromirror assembly (Digital Micromirror Device is called for short DMD) on the screen, this fixed-focus projection lens is from projection screen end to The display component end sequentially includes a first lens group with negative diopter and a second lens group with positive diopter. Wherein, the distance between the second lens group and the end of the display component is kept constant. When the distance between the projection screen end and the projection lens changes, a clear image can be obtained on the projection screen by adjusting the distance between the first lens group and the second lens group. In addition, when the distance between the first lens group and the second lens group is changed, the system focal length fa of the fixed-focus projection lens remains fixed.

[0033] In the fixed-f...

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Abstract

This invention discloses one focus projection lens head, which orderly comprises negative diopter first lens set and second lens from projection screen end to display part end, wherein, when the projection screen end and focus projection lens head distance changes, the second lens set and display parts distance are fixed to change first and second lens set to get clear image of projection lens system focus; the focus projection lens meet the following conditions: 1.413 G02B 9 / 10 G02B 13 / 18 G02B 1 / 04 20 9 2 2006 / 1 / 24 101008700 2007 / 8 / 1 100458488 2009 / 2 / 4 2009 / 2 / 4 2009 / 2 / 4 Asia Optical Co., Ltd. Taiwan Guo Zhongyuan 31114 The Patent Office of Shanghai Public Utility-Administering Bureau No.706 Hengshan Road, Shanghai 200030

Description

【Technical field】 [0001] The invention relates to a fixed-focus projection lens, in particular to a fixed-focus projection lens in which the focal length of the system remains fixed to obtain a clear image when the distance between the projection screen end and the projection lens changes. 【Background technique】 [0002] US Patent No. 6,404,564 discloses a two-group fixed-focus projection lens, which has a wide-angle projection image. However, when the distance between the projection screen end and the projection lens changes, the first lens group and the second lens group must move simultaneously. That is, the second lens group adjacent to the end of the display component will move relative to the display component, and the first lens group will also move relative to the second lens group. From the above, it can be seen that when both groups are moving, the lens barrel of the projection lens must be designed with rather complicated cam grooves and cam barrels, and such a d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B9/10G02B13/18G02B1/04
Inventor 郭仲渊
Owner ASIA OPTICAL CO INC