Projection type image display apparatus
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United States of America Patent
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Apr 20, 2010
Grant Date -
May 1, 2008
app pub date -
Oct 11, 2007
filing date -
Oct 13, 2006
priority date (Note) -
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status (Latency Note)
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Abstract
A projection-type display apparatus, comprises a front lens group having a plural number of lenses, each having rotationally symmetric surface configuration, a rear lens group, being disposed in rear of the front lens group, including a refractive lens for diverting a light and having a rotationally symmetric surface configuration, and a plural number of free curved surface lenses, each having a rotationally asymmetric free curved surface configuration, and a reflection mirror, being disposed in rear of the rear lens group, having a convex configuration into a direction of reflection of light and a rotationally asymmetric free curved surface configuration, at least in a part thereof.
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