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    • 1. 发明授权
    • Optical deflector with a pneumatic and a magnetic bearing
    • 光学偏转器带有气动和磁性轴承
    • US4726640A
    • 1988-02-23
    • US911110
    • 1986-09-24
    • Akihiko IwamaHiroki TajimaMitsuo Suzuki
    • Akihiko IwamaHiroki TajimaMitsuo Suzuki
    • F16C39/06G02B7/182G02B26/12H02K5/16H02K7/09G02B26/08
    • F16C32/0402F16C17/026F16C32/0427G02B26/121G02B7/1821H02K5/1677H02K7/09F16C2370/22
    • An optical deflector for deflecting a laser beam from a laser by rotating a polygon mirror uses a dynamic pressure pneumatic bearing as a radial bearing and a magnetic bearing as a thrust bearing. The deflector includes a hollow rotor rotatable integrally with the mirror, a stationary shaft received in said hollow rotor, a casing member accommodating the rotor and stationary shaft, and an annular rotor magnet assembly mounted on the outer periphery of the rotor. A first rotary magnet is mounted in an upper end portion of a rotary shaft and a first stationary magnet in an upper end portion of the stationary shaft in such a manner as to face each other with the same polarity, a repulsive force acting between the two magnets serving as a thrust magnetic bearing. A second stationary magnet is arranged to face the first rotary magnet with the same polarity. Further, a second rotary magnet is mounted in a lower end portion of the rotary shaft and a third stationary magnet in a lower end portion of the stationary shaft in such a manner as to face each other with the same polarity.
    • 用于通过旋转多面镜从激光器偏转激光束的光学偏转器使用动压气动轴承作为径向轴承和磁轴承作为推力轴承。 偏转器包括与反射镜一体旋转的中空转子,容纳在所述中空转子中的固定轴,容纳转子和固定轴的壳体构件以及安装在转子的外周上的环形转子磁体组件。 第一旋转磁体以相同的极性彼此面对的方式安装在旋转轴的上端部和固定轴的上端部中的第一固定磁体,作用在两者之间的排斥力 磁铁作为推力磁轴承。 第二固定磁体被布置成以相同的极性面向第一旋转磁体。 此外,第二旋转磁体以相同极性彼此面对的方式安装在旋转轴的下端部和固定轴的下端部中的第三静止磁体。