Color splitting prism combination

A dichroic prism and prism technology, applied in color TV, color TV parts, TV and other directions, can solve the problems of reducing the luminous efficacy of prism components, difficulty in manufacturing dichroic filters, etc., to avoid beams obliquely passing through the air gap , the effect of shortening the back focus and reducing the manufacturing cost

CN100434972CInactive Publication Date: 2008-11-19DELTA ELECTRONICS INC
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2008-11-19
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to a color-dividing prism set, which comprises a polarizing color-dividing prism and many prism areas. A pair of angle area of polarizing light-dividing prism has a polarizing light-dividing film, which is correspondent to first light-filter mirror and second light-filter mirror of specified color band on the adjacent boundary area. The first prism area and the second prism area are separately attached on first light-filter mirror and second light-filter mirror and then connect with polarizing light-dividing prism. The second prism area is a right angle prism with a third light-filter mirror on the bottom area; the third prism area is compounded with the second prism area through third light-filter mirror. The angle between the bevel of the right angle prism and the bottom area of the third light-filter mirror is no more than 30 deg.
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Description

technical field

[0001] The invention relates to a dichroic prism group, in particular to a dichroic prism group applied to a color projection system. Background technique

[0002] Please refer to figure 1 , which shows a Philips prism assembly 100 for separating incident light into three primary colors of red (R), blue (B) and green (G) in the optical system disclosed in US Pat. No. 5,621,486. like figure 1 As shown, the prism set 100 includes three prisms 102 , 104 , 106 and dichroic surfaces 108 , 110 coated with dichroic light filtering. The prisms 102 and 104 are separated by an air gap (airgap) 114. When the incident light I enters the prism group 100, the dichroic surface 110 will filter out and reflect the red light I R , while Blu-ray I B and green light I G can penetrate the dichroic surface 110, and then 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 r...

Examples

Embodiment Construction

[0016] Please refer to image 3 , which shows the first preferred embodiment of the dichroic prism group of the present invention. The dichroic prism group 10 is to separate the incident white light (white light) W into three different color components of red (R), green (G), and blue (B), so as to enter corresponding light valves (light valves) respectively, The corresponding liquid crystal light valves (liquid crystal light valve; LCLV) 30 , 32 and 34 are illustrated as examples. image 3 The solid line shows that the incident light W is separated into three different color components by the dichroic prism group 10, and enters the optical path of the corresponding liquid crystal light valve respectively; the dotted line shows that the different color components are reflected by the corresponding liquid crystal light valve, The dichroic prism group 10 combines light to a light path of a projection lens 36 .

[0017] like image 3 As shown, the dichroic prism group 10 is com...