Optics: image projectors – Distortion compensation – For projection axis inclined to screen
Reexamination Certificate
2011-05-10
2011-05-10
Dowling, William C (Department: 2878)
Optics: image projectors
Distortion compensation
For projection axis inclined to screen
C353S078000, C353S099000
Reexamination Certificate
active
07938545
ABSTRACT:
A projection optical system for use in an image projection apparatus illuminating a lightbulb forming an image in accordance with a modulating signal with illumination light from a light source is disclosed. 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 lightbulb. 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 lightbulb is formed as an intermediate image in the optical path, and the intermediate image is magnified and projected.
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Fujita Kazuhiro
Sakuma Nobuo
Takaura Atsushi
Dowling William C
Oblon, Spivak McClelland, Maier & Neustadt, L.L.P.
Ricoh & Company, Ltd.
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