Polarization illumination device and projector having the same

Details Polarization illumination device and projector having the same Polarization illumination device and projector having the same

1991-12-23

1995-02-07

Cuchlinski, Jr., William A.

Optics: image projectors

Polarizer or interference filter

353 34, 359 44, 359495, G03B 2128

Patent

active

053879538

ABSTRACT:
A polarization illumination device and projector having the polarization illumination device are provided. An example of the polarization illumination device comprises an illuminator and a polarized including a polarization splitting surface and a reflecting surface, the splitting surface and the reflecting surface form an inverted V shape. The splitting surface splits part of the light into a transmitted component and a reflected component and directs the former in a first direction and the latter toward the reflecting surface. The reflecting surface reflects a remaining part of the light and directs it toward the splitting surface. The splitting surface splits the remaining part of the light into a transmitted component and a reflected component. The former directed toward a second direction different from the first direction, and the latter is returned to the illuminator. The illuminator modulates a plane of each returned reflected light component and causes each returned reflected component to be incident on the polarizer again.

REFERENCES:
patent: 3876285 (1975-04-01), Schwarzmueller
patent: 4560999 (1985-12-01), Tokuhara
patent: 4798448 (1989-01-01), Van Raalte
patent: 4864390 (1989-09-01), McKechnie et al.
patent: 4989076 (1991-01-01), Owada et al.
patent: 5124841 (1992-06-01), Oishi
patent: 5153752 (1992-10-01), Kurematsu
Patent Abstract of Japan, Japanese Patent Publication No. JP-A 2093580 (published Apr. 4, 1990).
Japanese Journal of Applied Physics, vol. 29, No. 4, Apr. 1990, Tokyo, Japan, pp. 634-637.
Patent Abstract of Japan, Japanese Patent Publication No. JP-A 61090584 (published May 8, 1986).

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