Optics: image projectors – Particular condenser
Reexamination Certificate
2005-11-21
2008-10-21
Blackman, Rochelle-Ann (Department: 2862)
Optics: image projectors
Particular condenser
C353S099000, C362S551000, C362S296040, C362S302000, C362S347000, C359S434000, C359S623000, C359S641000, C359S649000
Reexamination Certificate
active
07438424
ABSTRACT:
An illumination optical apparatus and a projection type display apparatus capable of enhancing an illumination efficiency; having an ellipsoidal mirror, a light source arranged at a first focal point of the ellipsoidal mirror, a stop arranged closer to said light source side by a predetermined distance from a second focal point of said ellipsoidal mirror, and a positive refractive collimator lens for collimating a light flux emitted from the stop to a parallel light flux. A condition (0.01<L2/L1<0.06) is satisfied where, L1is a distance from an apex of the ellipsoidal mirror to the second focal point thereof and, L2(the light source side is a positive distance) is a distance from the second focal point of the ellipsoidal mirror to the stop.
REFERENCES:
patent: 5902033 (1999-05-01), Levis et al.
patent: 2004/0227910 (2004-11-01), Akiyama et al.
patent: 2005/0068507 (2005-03-01), Akiyama
patent: 07-161601 (1995-06-01), None
patent: 2000-221585 (2000-08-01), None
patent: 2000-241878 (2000-09-01), None
Takeuchi Katsuyuki
Yamada Ryuuji
Blackman Rochelle-Ann
Hogan & Hartson LLP
Kyocera Corporation
NEC Display Solutions, Ltd.
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