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Two-way color pyramid mirror and its mfg. method

A technology of a dichroic prism and a manufacturing method, which can be used in prisms, optics, instruments, etc., can solve the problem of high grinding cost of right-angle prisms

Inactive Publication Date: 2004-05-26
FUJI PHOTO OPTICAL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, if the right-angle accuracy is to be maintained at a very high level, the grinding cost of the right-angle prism, etc. will increase.

Method used

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  • Two-way color pyramid mirror and its mfg. method
  • Two-way color pyramid mirror and its mfg. method
  • Two-way color pyramid mirror and its mfg. method

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Embodiment Construction

[0031] Hereinafter, best embodiments of the present invention will be described with reference to the accompanying drawings. In all the drawings, the same symbols are given to the same or corresponding parts.

[0032] Figure 1A A dichroic prism of the present invention is indicated, which is indicated generally at 10 . The dichroic prism 10 is used in a liquid crystal projector to synthesize blue light, red light and green light with image information output from three liquid crystal display elements respectively corresponding to blue, red and green into one beam of light. color synthesis optics. The liquid crystal projector can project the light synthesized by the color synthesis optical element on the screen to display a full-color image.

[0033] Dichroic prism 10 as Figure 1A As shown, it is composed of a first rectangular prism 12, a second rectangular prism 14, a third rectangular prism 16, and a fourth rectangular prism 18, and is a columnar body with a square cross...

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PUM

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Abstract

A dichroic prism 10 according to the present invention comprises first to fourth right angle prisms 12, 14, 16 and 18 respectively having first side faces 28, 34, 40 and 46, and second side faces 30, 36, 42 and 48, the side faces being arranged perpendicular to each other. A second bonded face 22 and a fourth bonded face 26, each having a dichroic film for a second color light, are arranged on the same plane. The first bonded face 20 and a third bonded face 26, each having the dichroic film for a first color light, are deviated by a predetermined distance. The distance of this deviation is adjusted so that an image formed by the light having reference image information corresponds to the image of the reference image information. The light is made incident on and reflected by the first bonded face and the third bonded face. Therefore, an appropriate image quality can be obtained without depending on a right angle precision.

Description

technical field [0001] The present invention relates to a dichroic prism used for color synthesis in a liquid crystal projector and a manufacturing method thereof. Background technique [0002] In a full-color liquid crystal projector, white light from a light source is decomposed into three primary color lights, ie, red light, blue light, and green light, by a cross prism for color separation. The three primary colors of light decomposed by the orthogonal prism for color decomposition enter the liquid crystal display elements corresponding to the respective colors. Light incident on the liquid crystal display element is modulated according to image information. The three kinds of light output from the liquid crystal display elements corresponding to the respective colors of light are synthesized into one beam by the cross prism for color synthesis, and projected on the screen. [0003] The above-mentioned cross prism for synthesizing light...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/04G02B27/10G02F1/1335G03B21/00
CPCG02B5/04G02B27/149G02B27/1073G02B27/102
Inventor 川合悟滋田伦明门间恒一郎
Owner FUJI PHOTO OPTICAL CO LTD
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