Stress birefringence compensation in polarizing...

Details Stress birefringence compensation in polarizing... Stress birefringence compensation in polarizing...

2008-02-26

2010-06-08

Epps, Georgia Y (Department: 2878)

Optics: image projectors

Polarizer or interference filter

C353S033000, C353S081000, C353S084000, C349S096000, C349S057000, C348S337000, C362S019000, C362S337000, C362S339000, C359S490020, C359S638000, C359S640000, C359S251000

Reexamination Certificate

active

07731366

ABSTRACT:
An optical system is provided. The optical system comprises a first polarizing beamsplitter (PBS), a first reflecting image-forming device, and a first quarter-wave retarding element. An optical system is also provided that comprises an image-forming device, a reflective polarizing layer, at least a first birefringent element disposed on an optical path between the image-forming device and the polarizing layer, and a quarter-wave retarding element. Further provided is an optical system comprising a color combiner unit, at least two polarizing beamsplitters (PBSs), and a first quarter-wave retarding element. The present application also provides methods of compensating for birefringence in an image projection system.

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