Projection-type video display device
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United States of America Patent
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Feb 28, 2017
Grant Date -
Mar 17, 2016
app pub date -
Apr 24, 2013
filing date -
Apr 24, 2013
priority date (Note) -
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Abstract
Provided is a projection-type video display device implementing further reduction of a projection distance and further miniaturization of a projection optical system. The projection-type video display device includes a lens group which includes a plurality of lenses, a free-form-surface lens, and a free-form-surface mirror which projects light from the free-form-surface lens on a screen, wherein the lens group includes a third lens which has a bi-convex shape, a fourth lens which has a bi-concave shape, a fifth lens which has a bi-convex shape, the third to fifth lenses constitute a triplet lens, and wherein the free-form-surface lens has a meniscus lens shape of which a convex surface is oriented toward the magnification side.
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