PROJECTION APPARATUS
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United States of America Patent
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N/A
Issued Date -
Apr 21, 2011
app pub date -
Jun 22, 2010
filing date -
Oct 21, 2009
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A projection apparatus includes at least one light source, a field lens, a light valve, and a projection lens. The light source provides an illumination beam. The field lens is disposed in a transmission path of the illumination beam including an effective beam passing through the field lens and a ghost beam reflected by the field lens. The light valve converts the effective beam into an image beam. The projection lens includes a lens group, an aperture stop, and a light-shielding element. The lens group and the aperture stop are disposed in a transmission path of the image beam passing through the field lens and a ghost beam path of the ghost beam reflected by the field lens. The light-shielding element is disposed in at least a portion of the ghost beam path between the lens of the lens group furthest away from the aperture stop and the aperture stop.
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