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公开(公告)号：US5959778A
公开(公告)日：1999-09-28
申请号：US988704
申请日：1997-12-11
CPC分类号： H04N9/3105 , H04N9/3167 , H04N5/7441
摘要： Apparatus is disclosed that provides a high-luminance projected image with no color shading or uneven contrast. Light from a light source undergoes color separation by passing through a color-separation optical system (e.g., a cross-dichroic mirror or cross-dichroic prism). The light from the light source can also be split into first and second polarized lights by passage through, e.g., a first polarized-light beamsplitter (PBS). Each color-separated light is modulated by a respective color-signal light valve and undergoes color combining by, e.g., a cross-dichroic prism. The second polarized light, if formed, is modulated by a luminance-signal light valve, undergoes color combining and polarized-light combining by, e.g., a second PBS, and is projected by a projection lens (that comprises an aperture stop). The PBSs, cross-dichroic mirrors, and cross-dichroic prisms are situated where principal rays (defined by the aperture stop) are parallel to the optical axis. The first PBS (if present) and color-separation optical system are preferably arranged between a front illumination lens group and a rear illumination lens group both comprising an illumination relay optical system telecentric on both front and rear sides thereof. Field lenses and relay lenses can be included that comprise a relay optical system forming a magnified image of the color-signal light valves at a position conjugate to the luminance-signal light valve with respect to the projection lens.
摘要翻译： 公开了提供没有颜色阴影或不均匀对比度的高亮度投影图像的装置。 来自光源的光通过分色光学系统（例如，十字分色镜或交叉二向色棱镜）进行颜色分离。 来自光源的光也可以通过例如第一偏振光分束器（PBS）而分裂成第一和第二偏振光。 每个分色光由相应的颜色信号光阀调制，并通过例如交叉二向色棱镜进行颜色组合。 第二偏振光（如果形成）由亮度信号光阀调制，则通过例如第二PBS进行颜色组合和偏振光组合，并由投影透镜（包括孔径光阑）投影。 PBS，交叉二向色镜和交叉二向色棱镜位于主光线（由孔径光阑限定）平行于光轴的位置。 第一PBS（如果存在）和分色光学系统优选地布置在前照明透镜组和后照明透镜组之间，其均包括在其前后两侧的远心照明中继光学系统。 可以包括场透镜和中继透镜，其包括在与亮度信号光阀相对于投影透镜共轭的位置处形成彩色信号光阀的放大图像的中继光学系统。
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