Optics: image projectors – Polarizer or interference filter
Reexamination Certificate
2005-01-25
2005-01-25
Dowling, William C. (Department: 2851)
Optics: image projectors
Polarizer or interference filter
C359S506000
Reexamination Certificate
active
06846079
ABSTRACT:
A polarization converter (414) has polarizing conversion element body (414B) including: a polarization separating film (511) that separates an incident light into two linearly polarization beam; a reflecting film (512) alternately disposed between the polarization separating films (511), the reflecting film reflecting a linearly polarization beam reflected by the polarization separating film (511); a sheet glass (513) provided with the polarization separating film (511) and the reflecting film (512); and a retardation plate (600) that converts a polarization axis of the linearly polarization beam transmitted through the polarization separating film (511), a fixing frame (414A) that shields incident light beam on a position on the light-incident side of the polarizing conversion element body (414B) not opposing to the polarizing conversion element body (414B), the fixing frame (414A) having a holder that holds an end of the polarizing conversion element body (414B) and a fixing portion to be fixed to an inner case.
REFERENCES:
patent: 6199987 (2001-03-01), Haba et al.
patent: 6460998 (2002-10-01), Watanabe
patent: 6523958 (2003-02-01), Takezawa et al.
Kawai Fumie
Ogawa Yasunori
Dowling William C.
Oliff & Berridg,e PLC
Seiko Epson Corporation
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