Projection optical system and projection-type image display apparatus
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United States of America Patent
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Dec 6, 2011
Grant Date -
Sep 17, 2009
app pub date -
Apr 16, 2009
filing date -
Oct 21, 2004
priority date (Note) -
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Abstract
that forms the secondary image surface resulting from the intermediate image. A light beam travels from the center of the primary image surface and to the center of the secondary image surface and crosses an optical axis. The light beam is reflected on the concave reflector, crosses the optical axis again, and reaches the secondary image surface.
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