Projection optical system, projection type image display...

Optics: image projectors – Reflector – Plural

Reexamination Certificate

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Reexamination Certificate

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06951395

ABSTRACT:
A projection optical system which has a short projection distance and a compact structure, and allows oblique projection. The projection optical system projects luminous flux from an image forming element for forming an original image onto a projection surface which is oblique to a central principal ray which is a principal ray of luminous flux traveling from the center of the original image to the center of a finally formed image. The system includes a plurality of reflecting surfaces each having a curvature. In addition, the projection optical system satisfies a predetermined expression (1).

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European Search Report, dated Nov. 17, 2003, for EP 03 25 4526.
European Patent Office, Patent Abstracts of Japan for JP 2001-215412 (Aug. 10, 2001).

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