Multi-state optical switch and combiner for use in a light...

Optical: systems and elements – Holographic system or element – Using a hologram as an optical element

Reexamination Certificate

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C359S267000, C359S634000, C348S757000, C353S098000

Reexamination Certificate

active

07570404

ABSTRACT:
An image presentation device (100) incorporates an optical combiner (130) that utilizes a multi-state optical switch (131, 137) for use with a plurality of colored light sources (122, 124,126). The switch (131,137) includes an electronically switchable holographic optical element HOE (131) having a first and a second mode of operation. Light from first and second light sources (124, 126) passes through HOE (131) in a diffracted manner in at least one of the first and second modes of operation. Light from a third light source (122) is reflected by a reflector (137) in a third mode of operation. The combiner (130) operates to combine light from the various light sources (122, 124, 126) into a common light path.

REFERENCES:
patent: 5875012 (1999-02-01), Crawford et al.
patent: 6166800 (2000-12-01), Silverstein et al.
patent: 6373603 (2002-04-01), Popovich et al.
patent: 6678078 (2004-01-01), Popovich et al.
patent: 2001/0019434 (2001-09-01), Popovich et al.

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