Television – Video display – Projection device
Patent
1996-09-06
1999-08-31
Harvey, David E.
Television
Video display
Projection device
359487, 349 8, H04N 931
Patent
active
059460547
ABSTRACT:
In the optical apparatus, the projection lens has a first lens group and a second lens group, the color synthesizing optical system has a transparent plate, dichroic mirrors and a plane mirror, the second lens group is disposed between the color synthesizing optical system and the polarization beam splitters, and the plane including the normal line of the plane of the transparent plate, the color synthesizing planes of the dichroic mirrors and the optical axis of the projection lens is perpendicular to the plane including the normal line of the polarizing and splitting planes of the polarization beam splitters and the optical axis of the projection lens.
REFERENCES:
patent: 4836649 (1989-06-01), Ledebuhr et al.
patent: 4850685 (1988-08-01), Kamakura et al.
patent: 5231431 (1990-11-01), Yano et al.
patent: 5264879 (1991-01-01), Shikama
patent: 5530489 (1994-10-01), Henderson et al.
Patent Abstracts of Japan, vol. 16, No. 433 (p. 1418), Sep. 10, 1992 and JP 04 149426A (Canon Inc.), May 22, 1992, Category X.
Patent Abstracts of Japan, vol. 17, No. 448 (p. 1594), Aug. 17, 1993 and JP 05 100187 A (Hitachi Ltd.) , Apr. 23, 1993, Category X.
Miyatake Yoshito
Sannohe Shinya
Harvey David E.
Matsushita Electric - Industrial Co., Ltd.
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