Illumination optical system and projection-type display apparatus
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United States of America Patent
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May 9, 2006
Grant Date -
Jul 22, 2004
app pub date -
Jan 6, 2004
filing date -
Jan 7, 2003
priority date (Note) -
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status (Latency Note)
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Abstract
The illumination optical system for guiding a light emitted from a light source to an object to be illuminated along an optical path includes a first reflecting mirror reflecting a part of a light which is moving in a forward direction along the optical path to move away from the light source and a second reflecting mirror reflecting a part of a light which is reflected from the first reflecting mirror and moving in a reverse direction along the optical path to approach the light source. The first reflecting mirror has an opening facing a light-entering surface of the object to be illuminated, and the second reflecting mirror has a window that allows the light emitted from the light source to pass therethrough, whereby an optical cavity is constituted by the first and second reflecting mirrors.
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