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    • 2. 发明申请
    • OPTICAL ELEMENT AND PROJECTION-TYPE IMAGE DISPLAY DEVICE
    • 光学元件和投影型图像显示装置
    • US20090086345A1
    • 2009-04-02
    • US12207630
    • 2008-09-10
    • Kazuhiro ARAI
    • Kazuhiro ARAI
    • G02B27/14
    • G02B27/149G02B27/1046G02B27/123G02B27/145H04N5/7441H04N9/3105H04N9/315H04N9/3158
    • Provided is an optical element (dichroic mirror) including a mirror surface transmitting a part of an incident light beam therethrough and reflecting the other part of the incident light beam. A target cutoff wavelength, which indicates a boundary wavelength between a wavelength band of a desired transmission light beam and a wavelength band of a desired reflection light beam, is defined, the mirror surface includes a plurality of slant regions, each of the plurality of slant regions includes a reference position at which a cutoff wavelength reference value, which determines whether a light beam having a reference incidence angle should be transmitted or reflected, indicates the target cutoff wavelength, and in each of the plurality of slant regions, the cutoff wavelength reference value is set to be a shorter or a longer wavelength than the target cutoff wavelength, based on a distance from the reference position.
    • 提供一种光学元件(分色镜),其包括透射入射光束的一部分并反射入射光束的另一部分的镜面。 定义了表示期望的透射光束的波长带与期望的反射光束的波长带之间的边界波长的目标截止波长,镜面包括多个倾斜区域,多个斜面 区域包括参考位置,在该参考位置处,确定具有参考入射角的光束是否应被透射或反射的截止波长参考值指示目标截止波长,并且在多个倾斜区域中的每一个中,截止波长参考 基于与基准位置的距离,将值设定为比目标截止波长更短或更长的波长。