Invention Grant
US08649101B2 Projection apparatus 失效
投影仪

Projection apparatus
Abstract:
A projection apparatus includes an illumination system providing an illumination light beam, a light valve disposed in a transmission path of the illumination light beam and converting the illumination light beam into an image light beam, a projection lens disposed in a transmission path of the image light beam, a first field lens, and a second field lens. The first field lens and the second field lens are disposed between the light valve and the projection lens and in the transmission paths of the illumination light beam and the image light beam. The first field lens is a positive meniscus lens with a first concave surface facing the projection lens. The second field lens is a positive meniscus lens with a second concave surface adjacent to the first field lens. The projection apparatus is capable of reducing a ghost image.
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