Optics: image projectors – Temperature control
Reexamination Certificate
2006-05-09
2006-05-09
Perkey, W. B. (Department: 2851)
Optics: image projectors
Temperature control
C353S057000, C353S085000, C362S294000, C362S345000, C349S161000, C348S748000
Reexamination Certificate
active
07040762
ABSTRACT:
An image projector comprises a discharge lamp, image projecting means for displaying an image on a screen by emitting light from the discharge lamp, electric power regulating means for regulating the electric power supplied to the discharge lamp, a cooling fan for reducing the temperature of the discharge lamp or the image projecting means, a cooling fan controlling means for controlling the rotation of the cooling fan, and a sensor for detecting a temperature of the discharge lamp or the image projecting means, wherein the rotation of the cooling fan is stopped when the image projector is in a standby mode. In the standby mode, the cooling fan controlling means controls the rotation speed of the cooling fan based on the detected temperature.
REFERENCES:
patent: 5597223 (1997-01-01), Watanabe et al.
patent: 6472828 (2002-10-01), Pruett et al.
patent: 10-239767 (1998-09-01), None
patent: 2001-326086 (2001-11-01), None
Blackman Rochelle
Canon Kabushiki Kaisha
Canon U.S.A. Inc IP Division
Perkey W. B.
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