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    • 12. 发明申请
    • OPTICAL ELEMENT AND COLOR COMBINER
    • 光学元件和颜色组合
    • WO2009139799A1
    • 2009-11-19
    • PCT/US2008/088020
    • 2008-12-22
    • 3M INNOVATIVE PROPERTIES COMPANYMAGARILL, SimonBRUZZONE, Charles, L.OUDERKIRK, Andrew, J.
    • MAGARILL, SimonBRUZZONE, Charles, L.OUDERKIRK, Andrew, J.
    • G02B27/10G02B27/28
    • G02B27/144G02B27/283H04N9/3111H04N9/3167
    • Optical elements, color combiners using the optical elements, and image projectors using the color combiners are described. The optical element includes light recycling stacks, a polarizing beam splitter, and a color-selective stacked retardation polarizing filter. The polarizing beam splitter includes a first reflective polarizer aligned to a first polarization direction. Each light recycling stack includes a second reflective polarizer aligned to the first polarization direction, and a retarder aligned at 45 degrees to the first polarization direction. The color combiner includes partially reflective light sources coupled to the optical element. Unpolarized light having different colors can enter the color combiner through the light recycling stacks, and combined light of a desired polarization state can exit the color combiner. Light having an undesired polarization state can be recycled to the desired polarization state within the color combiner, so that light utilization efficiency is increased. The image projector includes a color combiner coupled to an imaging source and projection elements, so that a first portion of the combined light is directed to the projection element, and a second portion of the combined light is recycled back into the color combiner.
    • 描述使用光学元件的光学元件,组合器以及使用该颜色组合器的图像投影仪。 光学元件包括光循环堆叠,偏振分束器和彩色选择性堆叠延迟偏振滤光器。 偏振分束器包括与第一偏振方向对准的第一反射偏振器。 每个光回收堆叠包括与第一偏振方向对准的第二反射偏振器,和与第一偏振方向成45度对准的延迟器。 颜色组合器包括耦合到光学元件的部分反射光源。 具有不同颜色的非偏振光可以通过光循环堆叠进入合色器,并且所需偏振状态的组合光可以离开颜色组合器。 具有不期望的偏振状态的光可以在彩色组合器内再循环到期望的偏振状态,从而增加光的利用效率。 图像投影仪包括耦合到成像源和投影元件的颜色组合器,使得组合的光的第一部分被引导到投影元件,并且组合的光的第二部分被再循环回到组合器中。