Optics: image projectors – Polarizer or interference filter
Reexamination Certificate
2005-01-11
2005-01-11
Nguyen, Judy (Department: 2851)
Optics: image projectors
Polarizer or interference filter
C353S084000, C353S031000, C353S098000
Reexamination Certificate
active
06840623
ABSTRACT:
A light recovery system for a projection display includes a reflector having a first and a second focal points. A source of electro-magnetic radiation at the first focal point emits rays of radiation that reflect from the reflector and converge substantially at the second focal point. A retro-reflector reflects radiation that does not impinge directly on the relector toward the reflector. An input surfacre of a light pipe is disposed proximate to the second focal point to collect and transmit sustantially all of the radiation. A first reflector is disposed proximate to an output surface of the light pipe to transmit a first band of radiation while reflecting a second and third bands of radiation. A second reflector transmits the second band of tadiationn while reflecting the first and third bands of radiation. A third reflector transmits the tird band of radiation while reflecting the first and second bands of radiation.
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Nguyen Judy
Rothwell, Figg Ernst & Manbeck, PC
Sever Andrew
Wavien, Inc.
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