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    • 6. 发明授权
    • Projection optical system
    • 投影光学系统
    • US06624952B2
    • 2003-09-23
    • US10178205
    • 2002-06-24
    • Tomiei KuwaSoh OhzawaKohtaro Hayashi
    • Tomiei KuwaSoh OhzawaKohtaro Hayashi
    • G02B2718
    • G02B13/16G02B13/04G02B17/045
    • A projection optical system projects an enlarged image of a light valve image onto a screen. The system has, from the conjugate enlargement side: a negative front lens unit, optical path turning means (including a reflecting surface), a positive rear lens unit, and projection light preparing means, which can separate illumination and projection light, or can integrate light of different colors, or can do both. Each of the front and rear lens units includes at least one aspherical surface. The front lens unit has a negative first lens element at its conjugate-enlargement end and a negative second lens element at the conjugate reduction side of the first lens element. The rear lens unit includes a positive third lens element made of an anomalous dispersion material. The center of the light valve is not located on the optical axis of the rear lens unit.
    • 投影光学系统将光阀图像的放大图像投影到屏幕上。 该系统具有从共轭放大侧:负前透镜单元,光路转向装置(包括反射面),正后透镜单元和投影光准备装置,其可以分离照明和投影光,或可以集成 不同颜色的光,或可以做两者。 前后透镜单元中的每一个包括至少一个非球面。 前透镜单元在其共轭放大端具有负第一透镜元件,在第一透镜元件的共轭还原侧具有负第二透镜元件。 后透镜单元包括由异常分散材料制成的正的第三透镜元件。 光阀的中心不位于后透镜单元的光轴上。