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    Optical pick-up head, optical information apparatus, and optical information reproducing method
    1.
    发明公开
    Optical pick-up head, optical information apparatus, and optical information reproducing method 审中-公开
    Optischer Abtastkopf，optischesInformationsgerät，und optisches Informationswiedergabeverfahren

    公开(公告)号：EP1391884A2

    公开(公告)日：2004-02-25

    申请号：EP03019202.5

    申请日：2003-08-25

    申请人： MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.

    发明人： Kadowaki, Shin-ichi ,  Sano, Kousei ,  Arai, Akihiro ,  Yasuda, Katsuhiko ,  Kamei, Tomotada ,  Yamamoto, Hiroaki ,  Yamasaki, Fumitomo

    IPC分类号： G11B7/09

    CPC分类号： G11B7/1381 ,  G11B7/0901 ,  G11B7/0903 ,  G11B7/0941 ,  G11B7/0943 ,  G11B7/0948 ,  G11B7/131 ,  G11B7/133 ,  G11B7/1353 ,  G11B7/13927 ,  G11B2007/0013

    摘要： An optical information apparatus of the present invention includes:

    an optical pick-up head including: a light source; a diffraction unit; a condensing unit; a beam splitter; a photodetector; and a tracking error signal generator. An optical recording medium has tracks arranged substantially at a constant pitch. An average of a pitch is tp. When a main beam is placed on the track, a first sub-beam and a second sub-beam are placed between the tracks. The tracking error signal generator performs a differential arithmetic operation with respect to signals output from a light-receiving portion receiving the main beam to generate a first push-pull signal, performs a differential arithmetic operation with respect to signals output from the light-receiving portions receiving the first sub-beam and the second sub-beam to generate a second push-pull signal, and performs a differential arithmetic operation with respect to the first push-pull signal and the second push-pull signal to generate a tracking error signal, in a case where an amplitude of the first push-pull signal obtained at the pitch tp is fluctuated when the light beam is scanned in a direction orthogonal to the tracks of the optical recording medium.

    摘要翻译： 本发明的光信息设备包括：光拾取头，包括：光源; 衍射单位; 冷凝单元; 分束器 光电检测器 和跟踪误差信号发生器。 光记录介质具有基本上以恒定间距布置的轨道。 平均音高是tp。 当主光束被放置在轨道上时，第一子光束和第二子光束被放置在轨道之间。 跟踪误差信号发生器对从接收主波束的光接收部分输出的信号执行差分运算，产生第一推挽信号，对从光接收部分输出的信号执行差分运算 接收第一子光束和第二子光束以产生第二推挽信号，并且相对于第一推挽信号和第二推挽信号执行差分算术运算以产生跟踪误差信号， 当在与光记录介质的轨迹正交的方向上扫描光束时，以间距tp获得的第一推挽信号的幅度波动的情况。