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    • 33. 发明申请
    • Projector and phase difference plate and method of arranging phase difference plate
    • 投影仪和相位差板及相位差板的安排方法
    • US20050007503A1
    • 2005-01-13
    • US10497760
    • 2003-10-06
    • Junichi IwaiHideki Yamamoto
    • Junichi IwaiHideki Yamamoto
    • G02B5/30G02B27/28G02F1/13G02F1/13357G02F1/13363G03B21/00G02F1/1335
    • H04N9/3105G02B5/3025G02B5/3083G02B27/283G02F2001/133638
    • Provided are a projector capable of correcting a polarization state properly and improving image quality, a retardation plate being used in a projector or the like and being capable of correcting a polarization state properly, and a method of placing a retardation plate. A quarter-wave plate (22) is placed between a reflective spatial light modulator (21) and a PBS (20). The quarter-wave plate (22) includes a combination of a first retardation plate (41) and a second retardation plate (42) each producing a different phase difference. The phase differences produced by two retardation plates (41), (42) are set to be suitable amounts of phase difference according to a position state, so in spite of the fact that the quarter-wave plate (22) including the combination of two retardation plates, the quarter-wave plate (22) can correct the polarization state properly with performance equal to or higher than that in the case where the quarter-wave plate includes a single plate.
    • 提供了能够正确地校正偏振状态并提高图像质量的投影仪,在投影仪等中使用的能够正确地校正偏振状态的延迟板以及放置相位差板的方法。 四分之一波片(22)被放置在反射空间光调制器(21)和PBS(20)之间。 四分之一波片(22)包括各自产生不同相位差的第一延迟板(41)和第二延迟板(42)的组合。 由两个延迟板(41),(42)产生的相位差根据位置状态设定为适当的相位差量,所以尽管四分之一波片(22)包括两个 延迟板,四分之一波片(22)可以正确地校正偏振态,其性能等于或高于四分之一波片包括单个板的情况下的性能。