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    • 26. 发明授权
    • Compact-size magneto-optical head apparatus
    • 紧凑型磁光头装置
    • US5579291A
    • 1996-11-26
    • US358024
    • 1994-12-16
    • Yoshiyuki Matsumoto
    • Yoshiyuki Matsumoto
    • G11B7/12G11B7/135G11B11/105G11B11/00G11B7/00
    • G11B7/1356G11B11/10543G11B7/123G11B7/1353G11B7/1362
    • A magneto-optical head apparatus of a recording and/or reproducing apparatus includes a light beam generating unit, an objective lens, a separating optical element, a reflecting mirror, and a photodetector. The objective lens converges a light beam emitted from the light beam generating unit on a point on an optical axis, e.g., a point on the recording layer of a magneto-optical recording medium. The separating optical element deflects the light beam emitted from the light beam generating unit, and separates the light beam emitted from the light beam generating unit and a light beam through the objective lens. The reflecting mirror deflects the light beam emitted from the light beam generating unit and deflected by the separating optical element at 90.degree. so that the light beam is led to the objective lens. The photodetector receives the light beam irradiating through the objective lens and passing through the separating optical element. The light beam generating unit, the objective lens, the separating optical element and the photodetector are disposed so that the optical axis of the light beam emitted from the light beam generating unit, the optical axis extending from the separating optical element to the reflecting mirror, the optical axis from the reflecting mirror to the objective lens, and the optical axis from the separating optical element to the photodetector define the same plane.
    • 记录和/或再现装置的磁光头装置包括光束产生单元,物镜,分离​​光学元件,反射镜和光电检测器。 物镜将从光束产生单元发射的光束会聚在光轴上的点上,例如磁光记录介质的记录层上的点。 分离光学元件偏转从光束产生单元发射的光束,并且将从光束产生单元发射的光束和通过物镜的光束分离。 反射镜使从光束发生单元发射的光束偏转90°时被分离光学元件偏转,使得光束被引导到物镜。 光电检测器接收通过物镜照射并穿过分离光学元件的光束。 光束产生单元,物镜,分离​​光学元件和光电检测器被设置为使得从光束产生单元发射的光束的光轴,从分离光学元件延伸到反射镜的光轴, 从反射镜到物镜的光轴以及从分离光学元件到光电检测器的光轴定义相同的平面。