Illumination optical system and projection display apparatus
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United States of America Patent
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May 7, 2013
Grant Date -
Feb 24, 2011
app pub date -
Aug 6, 2010
filing date -
Aug 20, 2009
priority date (Note) -
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status (Latency Note)
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Abstract
An illumination optical system and a projection display apparatus include a beam combining portion and a condensing lens condensing a beam from the beam combining portion. The beam combining portion combines beams from first and second lamp units each including a lamp and a concave mirror, the lamp having a cathode and an anode arranged along an optical axis of the concave mirror. The beam combining portion includes a first reflective section disposed on an optical axis of the first lamp unit and off the optical axis of the second lamp unit and a second reflective section disposed off the optical axis of the first lamp unit. The first and second reflective sections reflect a beam that is emitted from the second lamp unit and that is off an optical axis thereof to combine the beams from the first and second lamp units.
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