Projection optical system, magnification projection optical...

Details Projection optical system, magnification projection optical... Projection optical system, magnification projection optical...

2006-02-02

2008-10-28

Koval, Melissa Jan (Department: 2862)

Optics: image projectors

Reflector

Plural

C353S102000, C359S663000

Reexamination Certificate

active

07441908

ABSTRACT:
A projection optical system for use in an image projection apparatus illuminating a light valve forming an image in accordance with a modulating signal with illumination light from a light source. The projection optical system includes first and second optical systems arranged along an optical path defining an upstream-downstream direction in the order described from upstream to downstream on the downstream side of the light valve. The first optical system includes at least one dioptric system and has positive power. The second optical system includes at least one reflecting surface having power and has positive power. The image formed by the light valve is formed as an intermediate image in the optical path, and the intermediate image is magnified and projected.

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