Optics: image projectors – Light shield – mask – hood – or diaphragm
Reexamination Certificate
2005-02-15
2005-02-15
Nguyen, Judy (Department: 2851)
Optics: image projectors
Light shield, mask, hood, or diaphragm
C353S020000, C353S037000, C353S038000, C353S060000, C353S099000, C353S102000, C348S744000, C359S233000, C349S007000
Reexamination Certificate
active
06854851
ABSTRACT:
A projection display according to the present invention reduces the size of a light beam in the optical path of an illumination optics from the periphery to change the amount of light incident on a video display device and the angle of such incidence, thereby making a plurality of image brightness/contrast combinations selectable. Further, the present invention changes the revolving speed of a projection display cooling fan and the adjustment value settings for the video display device's electrical characteristics in accordance with the aperture.
REFERENCES:
patent: 5519518 (1996-05-01), Watanabe et al.
patent: 3-111806 (1991-05-01), None
patent: 4-63318 (1992-02-01), None
patent: 6-342158 (1994-12-01), None
patent: 2001-222002 (2001-08-01), None
Kimura Nobuyuki
Nakashima Tsutomu
Nakayama Satoshi
Shiaki Takuya
Yamaguchi Eiji
Blackman Rochelle
Hitachi , Ltd.
Nguyen Judy
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