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Color splitting prism assembly

A dichroic prism and prism technology, applied in prisms, color TV, color photography, etc., can solve the problems of reducing the luminous efficacy of prism components, shortening the back focus, etc., to shorten the back focus, reduce the optical path, and improve the color purity. Effect

Inactive Publication Date: 2007-08-22
DELTA ELECTRONICS INC
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0005] However, although this system can achieve the effect of shortening the back focus and avoiding the disadvantages of the above-mentioned prism group 100, it will have a very large incident angle (=45deg) when the light beam is incident on the dichroic surface according to this design.
When the incident angle to the dichroic surface is too large, the polarization spectrum passing through the dichroic beam splitter will drift and affect the color purity after splitting, reducing the overall splitting efficiency of the prism group

Method used

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  • Color splitting prism assembly

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Embodiment Construction

[0017] FIG. 1A is a schematic plan view showing a dichroic prism group 10 according to an embodiment of the present invention. The dichroic prism group 10 is used to separate the incident white light (white light) into three different color components, for example, the sequentially separated red light I shown in the figure R and Blu-ray I B , Green Light I G Three primary colors (primary color).

[0018] According to this embodiment, the dichroic prism group 10 is composed of two prism blocks 12 and 14 . The prism block 12 is in the shape of a quadrangular prism, which can be formed by combining a triangular prism 16 and a rectangular prism 18 . FIG. 1B is a perspective view showing the components of the above-mentioned triangular prism (a), rectangular prism (b), and quadrangular prism (c), so as to clearly show the three-dimensional shapes of various prisms used in the present invention. As shown in Figure 1B, the "triangular prism" of the present invention is defined as...

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Abstract

This invention relates to a color separation prism set with one first prism area and second prism area. The first prism area near two boundary surfaces form relative color frequency band double color filter lens and the second prism area is tightly connected to the first prism area through coating the double color filter lens. The second prism area is set to make the beam into the double color filter lens with an incidence angle less than thirty degrees and make the light path of each color in the prism after the separation prism.

Description

technical field [0001] The invention relates to a dichroic prism group, which is applied to a color projection system in a TV camera or a color projection display. Background technique [0002] FIG. 7 is a schematic diagram showing a Philips prism assembly 100 for separating incident light into three primary colors of red (R), blue (B) and green (G) in a conventional optical system. As shown in FIG. 7 , the prism group 100 includes three prisms 102 , 104 and 106 , and dichroic surfaces 108 and 110 coated with a dichroic filter layer. The prisms 102 and 104 are separated by an air gap 114 . When the incident light I enters the prism group 100, the dichroic surface 110 filters out and reflects the red light I R , while Blu-ray I B and green light I G can penetrate the surface 110, the reflected red light I R After being reflected by an inner surface of the prism 102, it enters into a liquid crystal light valve (LCLV) 112R. Next, the red light I has been filtered out R Th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B27/10G02B5/04G03B33/12H04N9/31G02B5/20H04N5/225
Inventor 贺方涓
Owner DELTA ELECTRONICS INC
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