Optical unit and projection type projector apparatus using...

Details Optical unit and projection type projector apparatus using... Optical unit and projection type projector apparatus using...

2005-09-20

2005-09-20

Dowling, William C. (Department: 2851)

Optics: image projectors

Polarizer or interference filter

Reexamination Certificate

active

06945651

ABSTRACT:
By making the beam polarization state in a cross prism having a dichroic function for an incident beam on a reflection type liquid crystal panel the same as that for a reflected ON beam, a small-sized, low cost projection type projector apparatus is provided. A Faraday rotator having a Faraday rotation angle of 45 degrees is disposed on an optical path between a PBS and a cross prism. A half-wave plate having such a polarization axis as to rotate a polarization angle of linearly polarized light by 45 or 135 degrees is disposed on an optical immediately before or behind the Faraday rotator.

REFERENCES:
patent: 5130826 (1992-07-01), Takanashi et al.
patent: 6331879 (2001-12-01), Sawai et al.
patent: 6486997 (2002-11-01), Bruzzone et al.
patent: 6832836 (2004-12-01), Yatsu et al.

Affiliated with

Also associated with

Rating

Optical unit and projection type projector apparatus using... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Optical unit and projection type projector apparatus using..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Optical unit and projection type projector apparatus using... will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3410445