Optical: systems and elements – Polarization without modulation – By relatively adjustable superimposed or in series polarizers
Patent
1997-09-11
1999-08-24
Spyrou, Cassandra
Optical: systems and elements
Polarization without modulation
By relatively adjustable superimposed or in series polarizers
359496, G02B 530
Patent
active
059431687
ABSTRACT:
A polarized light optimization system for increasing the percentage of usable light for image projector illumination purposes. The system includes a light source, and a beam splitter that splits randomly polarized light from the light source into first and second beams having first and second polarizations. A polarization converter or rotator converts the polarization of one of the beams into the polarization of the other beam. Recombination means recombines the beams into a singularly polarized third beam, thereby increasing system illumination by increasing the percentage of usable light output from the light source. The recombination means includes a sawtooth mirror that has a plurality of substantially parallel equiangular mirrored facets that reflect incident light in a manner that maintains a radiation angle of divergence identical to that of the input randomly polarized light beam, thereby maintaining a maximum light contrast as the polarized beam is transmitted through the projector prism onto a projector light valve.
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Curtis Craig
Hughes-JVC Technology Corporation
Spyrou Cassandra
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