Polarized light illumination device and projector

Details Polarized light illumination device and projector Polarized light illumination device and projector

1999-08-12

2000-10-17

Adams, Russell

Optics: image projectors

Polarizer or interference filter

353 8, 353 31, 353 94, 349 9, G03B 2114, G03D 2100, G02F 11335

Patent

active

061320471

ABSTRACT:
In a polarized light illumination apparatus, randomly polarized lights emitted from first and second light sources are respectively separated by a polarized light separating optical element into two different types of polarized light thereby producing three types of polarized light which are polarized in directions perpendicular to one another. The polarized lights are partially returned to the light sources and their polarization directions are rotated. Secondary light source images are formed at locations shifted in an x direction whereby polarization is aligned in the same single direction. Thus, even though a plurality of light sources are used, the polarized light illumination apparatus can emit illumination light using both polarized components without causing an increase in the illumination angle. Furthermore, a projector capable of projecting an image with a very high brightness can be realized.

REFERENCES:
patent: 5295017 (1994-03-01), Konuma et al.
patent: 5446510 (1995-08-01), Mitsutake et al.
patent: 5765934 (1998-06-01), Okamori et al.

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