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Projection optical system, magnification projection optical system, magnification projection apparatus, and image projection apparatus

  • US 7,441,908 B2
  • Filed: 02/02/2006
  • Issued: 10/28/2008
  • Est. Priority Date: 02/06/2003
  • Status: Expired due to Term
First Claim
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1. 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 comprising:

  • first and second optical systems arranged along an optical path defining an upstream-downstream direction in an order described from upstream to downstream on a downstream side of the light valve,wherein 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 positive power; and

    the image formed by the light valve is formed as an intermediate image in the optical path in the first and second optical systems, and the intermediate image is magnified and projected.

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