Polarizing conversion unit, illuminating device and projector us

Details Polarizing conversion unit, illuminating device and projector us Polarizing conversion unit, illuminating device and projector us

1993-09-08

1997-01-07

Dowling, William

Optics: image projectors

Composite projected image

Plural projection paths with single light source

353 20, 353 37, 353 98, 359487, 349 5, G03B 2100

Patent

active

055909426

ABSTRACT:
A polarizing conversion unit is disclosed. The unit is provided with a polarizing beam splitter for separating light from a light source into first and second polarized lights differing in polarized state from each other, polarizing conversion means for varying the polarized state of the first polarized light and making it substantially coincident with the polarized state of the second polarized light, and reflecting means for reflecting the first or second polarized light, at least a portion of that surface of the outer peripheral portion of the polarizing conversion unit which is parallel to the optical path of the light functioning as a reflection surface.

REFERENCES:
patent: 3620592 (1971-11-01), Freeman
patent: 4088301 (1992-03-01), Kurematsu
patent: 4556292 (1985-12-01), Mathyssek et al.
patent: 5040871 (1991-08-01), Davie et al.
patent: 5124841 (1992-06-01), Oishi
patent: 5295018 (1994-03-01), Konuma et al.

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