Polarization conversion element, method of manufacturing the...

Details Polarization conversion element, method of manufacturing the... Polarization conversion element, method of manufacturing the...

2006-03-28

2009-02-24

Dowling, William C (Department: 2851)

Optics: image projectors

Polarizer or interference filter

C359S506000

Reexamination Certificate

active

07494223

ABSTRACT:
A polarization conversion device comprises a prismatic beam splitting assembly for separating p- and s- polarized polarized light orthogonal in the direction of polarization from a light source and a single sheet half-wave (λ/2) plate attached to an exit surface of the prismatic beam splitting assembly for changing one of the p- and s-polarized light 90° in the direction of polarization. The single sheet half-wave (λ/2) plate has a number of apertures arranged in a checked pattern and is prepared by die-cutting a single optical sheet using a pressing machine and adhered to the exit surface of the beam splitting assembly.

REFERENCES:
patent: 6199987 (2001-03-01), Haba et al.
patent: 6523958 (2003-02-01), Takezawa et al.
patent: 6846079 (2005-01-01), Ogawa et al.
patent: 11-218724 (1999-08-01), None
patent: 2001-235624 (2001-08-01), None

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