Optics: image projectors – Unitary plural refracting surfaces
Patent
1997-08-18
1999-02-02
Dowling, William
Optics: image projectors
Unitary plural refracting surfaces
353 20, 353 31, 353 37, 353101, 359 9, G03B 2114
Patent
active
058655212
ABSTRACT:
An output light from an light source lamp unit 8 in a projection-type display apparatus illuminates liquid-crystal light valves 925R, 925G and 925B for three colors via an integrator optical system 923. A superimposing lens 930 that is a component of the integrator optical system 923 as a uniform illumination optical system is arranged such that the mounting position of the superimposing lens 930 is fine-adjustable in a direction orthogonal to an optical axis 1a. By fine-adjusting the mounting position of the superimposing lens 930, the position of an illumination area B is adjusted such that the illumination area includes the image forming area A of the liquid-crystal light valve. It is not necessary to assure a wide margin around the image forming area A to cover the offset of the position of the illumination area B. As a result, the utilization of illumination light is heightened and a bright projected image results.
REFERENCES:
patent: 5098184 (1992-03-01), Van Den Brandt et al.
patent: 5418583 (1995-05-01), Masumoto
patent: 5626409 (1997-05-01), Nakayama et al.
patent: 5662401 (1997-09-01), Shimizu et al.
Haba Shinji
Hashizume Toshiaki
Iechika Hisashi
Ogawa Yasunori
Yajima Akitaka
Dowling William
Seiko Epson Corporation
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