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    • 5. 发明授权
    • Projection optical system and image projecting apparatus
    • 投影光学系统和图像投影仪
    • US08025415B2
    • 2011-09-27
    • US11854920
    • 2007-09-13
    • Issei AbeKazuhiro FujitaAtsushi Takaura
    • Issei AbeKazuhiro FujitaAtsushi Takaura
    • G03B21/14G03B21/22
    • G02B17/08G02B13/16G02B17/0812G02B17/0852G03B21/147G03B21/28H04N9/3102
    • A projection optical system including a first optical system configured to form a second image conjugate to a first image and a second optical system configured to include a reflective optical element which reflects light from the second image and to project a third image conjugate to the second image onto a projection surface is provided, wherein the first optical system includes a stop and at least one optical element with a positive refractive power and at least one optical element with a negative refractive power which are provided between the stop and the second image, and an optical element with a strongest positive refractive power in the at least one optical element with a positive refractive power is provided between the stop and an optical element with a strongest negative refractive power in the at least one optical element with a negative refractive power.
    • 一种投影光学系统,包括被配置为形成与第一图像的第二图像共轭的第一光学系统和被配置为包括反射光学元件的第二光学系统,所述反射光学元件反射来自所述第二图像的光并将第三图像共轭投影到所述第二图像 提供了一种投影表面,其中第一光学系统包括止动件和至少一个具有正屈光力的光学元件和至少一个具有负屈光力的光学元件,其设置在止动件和第二图像之间,并且 在具有正折光力的至少一个光学元件中具有最强正屈光力的光学元件设置在具有正屈光力的至少一个光学元件中具有最强负折射光焦度的光阑与光学元件之间。