Illumination – Light source and modifier – Including reflector
Reexamination Certificate
2005-11-08
2005-11-08
O'Shea, Sandra (Department: 2875)
Illumination
Light source and modifier
Including reflector
C362S293000, C362S551000
Reexamination Certificate
active
06962426
ABSTRACT:
An image projection system achieves improved image brightness and optical efficiency by redirecting some of the unused polychromatic light emitted by a primary light source and reflected by a spatially nonuniform light filter back into the lamp assembly housing the light source. The unused portions of the polychromatic light are re-reflected for transmission through a different spatial region of the light filter, resulting in an approximately 30% increase in probability of transmission. Because recirculation of unused light occurs within the lamp assembly, there is no significant reduction in etendue. In a first preferred embodiment, an interference light filter reflects certain colors of light while transmitting other colors of light. In a second preferred embodiment, a polarizing light filter passes light in certain polarization states while reflecting light in other polarization states.
REFERENCES:
patent: 4427283 (1984-01-01), Gasper
patent: 4897771 (1990-01-01), Parker
patent: 5773918 (1998-06-01), Dolan et al.
patent: 5833360 (1998-11-01), Knox et al.
patent: 6020676 (2000-02-01), Ury et al.
patent: 6072268 (2000-06-01), Dolan et al.
patent: 6123436 (2000-09-01), Hough
patent: 6591022 (2003-07-01), Dewald
http://www.profluxpolarizer.com/polarizers.htm, ProFlux Microwire Technology, Polarizers, visited Sep. 4, 2001, 2 pages.
http://www.fusionlighting.com/technology.htm, Fusion Lighting, Fusion's Technology, visited Nov. 2, 2001, 2 pages.
Kirkpatrick, Douglas A.,Aperture Lamps, 309-318.
K. Kipling, et al.,High-Brightness Electrodeless Lamp for Projection Displays, SID Digest, 1999, 1080-1083.
D. Scott Dewald, et al.,Sequential Color Recapture and Dynamic Filtering: A Method of Scrolling Color, SID Digest, 2001, 1076-1079.
InFocus Corporation
O'Shea Sandra
Sawhney Hargobind S.
Stoel Rives LLP
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