Illumination device and projector

Details Illumination device and projector Illumination device and projector

2006-03-07

2006-03-07

Ward, John Anthony (Department: 2875)

Illumination

With polarizer

C362S293000, C362S322000, C362S330000

Reexamination Certificate

active

07008070

ABSTRACT:
An illumination device includes: a light source; a polarization converter (114) that converts a light beam irradiated by the light source into a substantially uniform linear polarized light, the polarization converter (114) being slanted relative to a central axis of the light beam irradiated by the light source and including a plurality of polarization-separating films (1141) and a plurality of light reflection films (1143) alternately arranged in a direction substantially orthogonal to the central axis of the light beam irradiated by the light source; an optical filter (311) provided between the light source and the polarization converter (114) and having a plurality of optical conversion layers, which are formed striped with the pitch thereof corresponding to the arrangement of the polarization-separating films (1141) to optically convert the incident light beam; a holder frame (312) that holds the optical filter (311); and a filter-driving mechanism (313) that moves the holder frame (312) in a direction in which the polarization-separating films (1141) are arranged.

REFERENCES:
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patent: 2002-196302 (2002-07-01), None
patent: WO 95/22081 (1995-08-01), None

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