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    • 63. 发明授权
    • Zoom lens system
    • 变焦镜头系统
    • US06891680B2
    • 2005-05-10
    • US10677285
    • 2003-10-03
    • Susumu Sato
    • Susumu Sato
    • G02B15/167G02B15/173G02B27/64
    • G02B27/646G02B15/173
    • The object is to provide an afocal zoom lens system with the f-number of about 4 or less capable of performing vibration reduction correction. The system includes, in order from an object, a first group G1 being positive, a second group G2 being negative, a third group G3 being positive, and a fourth group G4 being positive. Zooming is performed by moving the second and third groups along the optical axis. The fourth group G4 is composed of a front group G4F being positive, a middle group G4M being negative, and a rear group G4R being positive. Vibration reduction is performed by shifting the middle group G4M perpendicular to the optical axis. The first group G1 consists of a first front group G1f being fixed, a first middle group G1m being movable, and a first rear group G1r being fixed. Focusing is performed by moving G1m along the optical axis.
    • 本发明的目的是提供一种能够进行减振校正的f数在4以下的无焦焦变焦透镜系统。 该系统按照从物体起依次包括第一组G 1为正,第二组G 2为负,第三组G 3为正,第四组G 4为正。 通过沿着光轴移动第二组和第三组来执行变焦。 第四组G 4由前组G 4 F为正,中组G 4 M为负,后组G 4 R为正的组成。 通过将中间组G 4 M垂直于光轴移动来进行减震。 第一组G 1由固定的第一前组G 1 f,可移动的第一中组G 1 m和固定的第一后组G 1 r组成。 沿着光轴移动G 1 m进行聚焦。
    • 64. 发明授权
    • Pretilt angle measuring method and measuring instrument
    • 预倾角测量方法和测量仪器
    • US06822737B2
    • 2004-11-23
    • US10009937
    • 2002-06-04
    • Tetsuyuki KurataTakahiro NishiokaYoshihiro TogashiSusumu Sato
    • Tetsuyuki KurataTakahiro NishiokaYoshihiro TogashiSusumu Sato
    • G01J400
    • G02F1/1309G01B11/26
    • An apparatus for detecting a pretilt angle is comprised of a light source 1, a polarizer 2, a liquid-crystal cell 3, a quarter-wave plate 4, an analyzer 5, a photodetector 6, and a processing device. The processing device receives from the photodetector transmitted light intensities of light that is transmitted through the liquid-crystal cell 3 at a plurality of light incident angles. The processing device calculates Stokes parameters corresponding to the plurality of light incident angles based upon the transmitted light intensity corresponding to the plurality of light incident angles. Furthermore, an apparent retardation corresponding to the plurality of light incident angles is determined based upon the Stokes parameters corresponding to the plurality of light incident angles. The pretilt angle of the liquid-crystal cell 3 is determined based upon the determined apparent retardation corresponding to the plurality of light incident angles.
    • 用于检测预倾角的装置包括光源1,偏振器2,液晶单元3,四分之一波片4,分析器5,光电检测器6和处理装置。 处理装置从光电检测器接收以多个光入射角透射通过液晶单元3的光的透射光强度。 处理装置基于与多个光入射角对应的透射光强度来计算与多个光入射角对应的斯托克斯参数。 此外,基于与多个光入射角对应的斯托克斯参数来确定与多个光入射角相对应的视在延迟。 基于与多个光入射角相对应的确定的视在延迟来确定液晶单元3的预倾角。