Oblique projection optical system and projection type display apparatus using the same
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United States of America Patent
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Aug 30, 2016
Grant Date -
May 29, 2014
app pub date -
Jan 30, 2014
filing date -
Jan 8, 2009
priority date (Note) -
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status (Latency Note)
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Abstract
A projection type display apparatus including an oblique projection optical system having a plurality of lenses is disclosed. A lens nearest to a projection screen has a vertical effective image area through which a light flux passes. The lens is arranged at a position not including an optical axis shared by the largest number of lenses among the plurality of lenses. A flat mirror for returning the optical path is arranged between the particular lens and the projection screen at a predetermined angle to the optical axis. An enlarged image obtained by the light flux returned by the flat mirror is formed toward a display screen.
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