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    • 54. 发明授权
    • Optical head
    • 光头
    • US4724533A
    • 1988-02-09
    • US744480
    • 1985-06-13
    • Shunji OharaTomio YoshidaTakashi Ishida
    • Shunji OharaTomio YoshidaTakashi Ishida
    • G11B7/09
    • G11B7/1365G11B7/0912G11B7/1356G11B7/1381G11B7/0901
    • An optical head in which the light emitted from a light source is narrowed to a minute spot of light and applied to a recording medium such as a disk thereby to effect recording and reproduction, or reproduction alone. A focusing plate or prism is provided in the optical path for forming the image of the light reflected from the recording medium. The focusing plate or prism has a first surface which reflects and transmits the reflected light and a second surface which is located closer to the image-forming position than the first surface and reflects the reflected light which is transmitted or reflected by the first surface. The optical head is further provided with a photodetector which is divided into at least two portions which individually receive the light rays which are respectively reflected from the first and second surfaces. A focusing servo control signal is obtained from the difference between the respective outputs of the divided photodetector portions. Moreover, a tracking servo control signal is obtained from the difference between the respective outputs of the peripheral portions among the divided photodetector portions.
    • 其中从光源发射的光被变窄到光的微小点并且被施加到诸如盘的记录介质上的光学头,从而仅进行记录和再现或再现。 在光路中设置聚焦板或棱镜,用于形成从记录介质反射的光的图像。 聚焦板或棱镜具有反射和透射反射光的第一表面和位于比第一表面更靠近图像形成位置的第二表面,并且反射由第一表面透射或反射的反射光。 光头还设置有光电检测器,其被分成至少两个部分,其分别接收从第一表面和第二表面分别反射的光线。 从分割光电检测器部分的各个输出之间的差获得聚焦伺服控制信号。 此外,从划分的光电检测器部分中的周边部分的各个输出之间的差获得跟踪伺服控制信号。