Optics: image projectors – Particular condenser
Reexamination Certificate
2007-06-19
2007-06-19
Perkey, W. B. (Department: 2851)
Optics: image projectors
Particular condenser
C353S020000, C349S062000, C349S009000
Reexamination Certificate
active
10995115
ABSTRACT:
A light recovery system for a projection display with a reflector having a first and a second focal points. A source of electro-magnetic radiation is disposed proximate to the first focal point of the reflector to emit rays of radiation that reflect from the reflector and converge substantially at the second focal point. A retro-reflector reflects at least a portion of the electromagnetic radiation that does not impinge directly on the reflector toward the reflector through the first focal point of the reflector to increase the flux intensity of the converging rays. A light pipe wit an input surface and an output surface is disposed with the input surface proximate to the second focal point to collect and transmit substantially all of the radiation. A PBS is disposed proximate to the output surface to collect and polarize substantially all of the radiation into a radiation of a first polarization and a second polarization. Radiation of the first polarization is transmitted, while radiation of the second polarization is reflected toward the output surface. A wave plate is disposed in a path of the radiation of the second polarization.
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Fulbright & Jaworski LLP
Perkey W. B.
Sever Andrew
Wavien, Inc.
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