Optics: image projectors – Temperature control – Blower
Patent
1996-09-24
1997-11-04
Dowling, William
Optics: image projectors
Temperature control
Blower
353 61, 353DIG3, G03B 2116
Patent
active
056831609
ABSTRACT:
An overhead projector includes a housing including a stage which is formed in its top wall and on which a transparency bearing an image to be projected is placed and an air outlet formed in one of its two side walls, an exhaust fan incorporated in the housing for exhausting air in the housing through the air outlet of the housing, a projection light source such as a high illuminance halogen lamp disposed in the housing for illuminating the transparency on the stage from inside the housing, a projection head mounted for projecting a magnified image from the transparency on a screen and including a focusing lens and a reflecting mirror, a column mounted on the housing to hold the projection head over the stage, a Fresnel lens disposed inside the stage to converge light from the light source on the focusing lens of the projection head, a cooling fan, and air guides for guiding air delivered from the cooling fan so that the air flows along a surface of the stage.
REFERENCES:
patent: 3619048 (1971-11-01), Engert et al.
patent: 3711194 (1973-01-01), Wilson, Jr.
patent: 4880303 (1989-11-01), Grunwald
patent: 4882599 (1989-11-01), Grunwald
patent: 4904079 (1990-02-01), Yoshimura et al.
Fukaya Mamoru
Kai Mutsuo
Kinoshita Tatsuo
Dowling William
Elmo Co., Ltd.
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