Rear projection type image display device

Details Rear projection type image display device Rear projection type image display device

2007-07-17

2007-07-17

Perkey, W. B. (Department: 2851)

Optics: image projectors

Cabinet encloses projector and one side of screen

Reflector between lamp and screen

C353S076000, C353S034000, C353S049000, C353S082000, C353S119000, C359S460000, C359S449000, C359S319000, C359S625000, C359S626000, C359S684000

Reexamination Certificate

active

10922225

ABSTRACT:
The present invention relates to a rear projection type image display device comprising projection lenses (2, 3) for projecting an image displayed on an image display element onto a transmission type screen (6) on a larger scale, an optical path turn-back mirror (7) for turning back halfway a light beam projected from the projection lenses, and a drive circuit for displaying an image on the image display element, that are fixedly housed within a housing (5). When a diagonal size of the transmission type screen (6), the depth of the housing (5), and the length from a lower end of the screen (6) to a lower end of the housing (5), are assumed to be SS (inch), D (inch), and L (inch), respectively, the following conditions are satisfied:in-line-formulae description="In-line Formulae" end="lead"?SS >40, D≦SS/3.0, L≦SS/10.9.in-line-formulae description="In-line Formulae" end="tail"?

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Chinese Office Action issued in corresponding Chinese Patent Application No. 2004100570726 dated Nov. 17, 2006.

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