Polarized-light converting unit and projector using the same

Details Polarized-light converting unit and projector using the same Polarized-light converting unit and projector using the same

2005-03-22

2005-03-22

Dowling, William C. (Department: 2851)

Optics: image projectors

Polarizer or interference filter

C353S033000, C359S490020

Reexamination Certificate

active

06869184

ABSTRACT:
Disclosed is a polarized-light converting unit, which is excellent in contrast performance and realizes high reliability and an increase in its life, and a projector device using the converting unit. The polarized-light converting unit includes first and second polarizing beam splitters provided in an integral form. The first polarizing beam splitter includes two incident planes on which two types of color light are respectively incident. The second polarizing beam splitter includes both a ¼-wave plate and first dichroic mirror, and a ¼-wave plate and a second dichroic mirror, both of which are disposed on two adjacent surfaces different from a junction surface with the first polarizing beam splitter and an outgoing surface thereof.

REFERENCES:
patent: 6176586 (2001-01-01), Hirose et al.
patent: 6343864 (2002-02-01), Tajiri
patent: 6525785 (2003-02-01), Shiue
patent: 6678015 (2004-01-01), Yi et al.
patent: P2001-42124 (2001-02-01), None
patent: P2001-318426 (2001-11-01), None

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