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

  • US 20060126032A1
  • Filed: 02/02/2006
  • Published: 06/15/2006
  • Est. Priority Date: 02/06/2003
  • Status: Active Grant
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 power and has positive power; and

    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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