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    • 9. 发明授权
    • Projector
    • 投影机
    • US07168812B2
    • 2007-01-30
    • US10980330
    • 2004-11-04
    • Kanji YoshidaJoji Karasawa
    • Kanji YoshidaJoji Karasawa
    • G03B21/14G03B21/26
    • G03B21/14G03B21/208H04N9/315
    • To provide a projector that hardly causes deterioration of an image resulted from stray light. A neutral density filter, of which posture can be fine-adjusted by a posture regulating mechanism, is placed in a space between a second dichroic mirror and a liquid crystal light valve. Thus, it is possible to remove stray light, corresponding to condensed light resulted from multi-pass through a field lens or the like, to the outside of a light path by merely tilting the neutral density filter adequately. It is thus possible to project an image having homogeneous brightness (illuminance at the white level) across the entire screen, which in turn makes it possible to project an image having no irregularities in color across the entire screen.
    • 提供几乎不引起由杂散光引起的图像劣化的投影仪。 可以通过姿势调节机构将姿势微调的中性密度滤光器放置在第二分色镜与液晶光阀之间的空间中。 因此,通过适当地倾斜中性浓度滤光器,可以将对应于多次通过场透镜等的聚光的杂散光移除到光路的外部。 因此,可以在整个屏幕上投射具有均匀亮度(在白色水平的照度)的图像,这进而使得可以在整个屏幕上投射没有颜色不均匀的图像。