LIGHTING SYSTEM AND PROJECTION DISPLAY DEVICE BY USING IT

Japanese Patent JP3792883

B2

PROBLEM TO BE SOLVED: To maintain directivity of light, and simultaneously to aim both uniformity of an illuminance distribution and improvement of a light efficiency in a lighting system used in a liquid crystal projector or the like.
SOLUTION: An optical beam from a light source lamp 21, reflected by a reflector 22, is converted to an optical beam having a rectangular section shape by elements 24, 25. The optical beam, uniformed by the shape conversion, is space-divided into four, that is, upper and lower, and light and left, optical beams by a primary prism lens 27 having four divided prism faces, and the divided optical beams are focussed on four divided prism faces of a secondary prism lens 28, respectively. The four divided optical beams are deflected by the prism lens 28, and then transferred on a liquid crystal panel 31 through a collimator lens 30 and piled up. The optical beams, uniformed by the optical- beam shape conversion, are furthermore divided and piled up, to thereby enable to maintain directivity of the light and simultaneously to aim both uniformity of an illuminance distribution and improvement of a light utilization efficiency.

Yoshinori Honmiya
Yu Kitamura
Takashima
Hisayuki Mihara

JP7263698A

July 05, 2006

March 20, 1998

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Toshiba Corporation
Toshiba Digital Media Engineering Co., Ltd.

F21V13/04; G09F9/00; G02B5/04; G02B27/00; G02F1/13; G02F1/1335; G02F1/13357; G03B21/00; H04N5/74; (IPC1-7): F21V13/04; G02B5/04; G02F1/13; G02F1/1335; G03B21/00; G09F9/00

JP9237512A
JP7181392A
JP7294865A
JP9105898A
JP9152553A

Takehiko Suzue
Sadao Muramatsu
Atsushi Tsuboi
Ryo Hashimoto
Satoshi Kono
Makoto Nakamura
Shoji Kawai

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