Optics: image projectors – Cabinet encloses projector and one side of screen
Patent
1997-02-21
1998-11-03
Dowling, William
Optics: image projectors
Cabinet encloses projector and one side of screen
353 97, 353122, 353 85, G03B 2114
Patent
active
058298550
ABSTRACT:
A projection-type display apparatus has a casing enclosing a light source and a projection optical system for projecting an image onto a picture screen when a power source is turned on and includes an opening, a door, a locking device and a temperature detector. A door is associated with the casing and the opening and moves between a closed condition to cover the opening and an open condition to provide access into the casing. The locking device is associated with the door and the casing and operate to lock and unlock the door. The temperature detector detects a temperature of the light source or a vicinity proximate the light source and is operably connected to the locking device. When the detected temperature exceeds a predetermined temperature, the locking device retains the door in the locked state and when the detected temperature is equal to or less than the predetermined temperature, the locking device unlocks the door. Another embodiment of the projection-type display apparatus includes a rectangular conversion member, a photometry device and a display device.
REFERENCES:
patent: 4135784 (1979-01-01), Larrick
patent: 5289287 (1994-02-01), Dargis et al.
patent: 5363149 (1994-11-01), Furuno et al.
patent: 5491585 (1996-02-01), Dolgoff
patent: 5512968 (1996-04-01), Hagiwara et al.
Dowling William
Nikon Corporation
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