Optical unit and a projection image display apparatus using...

Details Optical unit and a projection image display apparatus using... Optical unit and a projection image display apparatus using...

2007-05-29

2007-05-29

Perkey, W. B. (Department: 2851)

Optics: image projectors

Polarizer or interference filter

C353S031000, C353S034000, C353S037000, C353S084000, C353S099000, C349S009000, C349S096000, C359S487030, C359S490020, C359S634000, C359S637000, C359S639000, C348S750000, C348S758000

Reexamination Certificate

active

10916991

ABSTRACT:
The present invention provides a projection image display technology capable of correcting astigmatism due to use of a polarized-beam splitter, thus ensuring high-resolution projection images. A wire-grid polarized-beam splitter (or the like) of a flat-plate-like structure is used as a polarized-beam splitter, and an astigmatism correction element, such as a cylindrical lens, is provided between the polarized-beam splitter and a projection lens unit.

REFERENCES:
patent: 5562334 (1996-10-01), Wortel
patent: 6450645 (2002-09-01), Jeon
patent: 6585378 (2003-07-01), Kurtz et al.
patent: 05-313119 (1993-11-01), None
patent: 09-114021 (1997-05-01), None
patent: 10-055037 (1998-02-01), None
patent: 2000-111862 (2000-04-01), None
patent: 2001-056449 (2001-02-01), None
Translation of JP Patent No. 2000-111862.

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