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    • 4. 发明授权
    • Head-position controlling device
    • 头位控制装置
    • US5739971A
    • 1998-04-14
    • US279266
    • 1994-07-21
    • Hideaki YamakiTomotaka Muramoto
    • Hideaki YamakiTomotaka Muramoto
    • G11B21/10G11B5/55G11B21/08G11B5/596
    • G11B5/5556G11B21/085
    • A head-position controlling device includes a head moving mechanism for causing a head to move with respect to a recording track on a recording medium; a detecting circuit for detecting an amplitude of a reproduced signal which is reproduced from the recording track on the recording medium by the head; and a controlling circuit for controlling the head moving mechanism on the basis of an output of the detecting circuit. If so that if the amplitude of the reproduced signal is greater than a predetermined level, the head is made to move in units of a first moving amount to detect a position where the amplitude of the reproduced signal is a maximum, and if the amplitude of the reproduced signal is less than the predetermined level, the head is made to move in units of a second moving amount greater than the first moving amount. If the amplitude of the reproduced signal becomes greater than the predetermined level, the moving amount of the head is switched to the first moving amount.
    • 头位置控制装置包括头移动机构,用于使头相对于记录介质上的记录轨道移动; 检测电路,用于检测由头部从记录介质上的记录轨迹再现的再现信号的幅度; 以及控制电路,用于根据检测电路的输出来控制磁头移动机构。 如果这样,如果再现信号的幅度大于预定水平,则使头部以第一移动量为单位移动,以检测再现信号的振幅是最大的位置,并且如果振幅 再现信号小于预定水平,头部以大于第一移动量的第二移动量为单位移动。 如果再现信号的幅度变得大于预定电平,则头部的移动量被切换到第一移动量。