Rear projection type image display device

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

2008-03-11

2008-03-11

Hasan, M. (Department: 2873)

Optical: systems and elements

Lens

With field curvature shaping

C353S030000

Reexamination Certificate

active

11705070

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 with English translation issued in corresponding Chinese Patent Application No. 2004-100570726, dated Nov. 17, 2006.

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