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    • 11. 发明授权
    • Tracking servo for a disk player with a dc motor
    • 使用直流电机跟踪磁盘播放器的伺服
    • US4609954A
    • 1986-09-02
    • US585702
    • 1984-03-02
    • Richard H. BoltonRobert P. Cloutier
    • Richard H. BoltonRobert P. Cloutier
    • G11B5/55G11B21/08
    • G11B5/5556G11B21/085
    • A tracking servo for a disk player controls the movement of a playback head between prerecorded magnetic tracks carried by a magnetic disk. A feedback signal is provided from a timing wheel attached to a cam and gear configuration that connects a dc servomotor to the head. The servo separates the track-to-track movement into two components: one component occurring while the dc motor is energized and another occurring while the dc motor is coasting to a stop, presumably opposite the desired track. The first component of movement continues until the feedback signal corresponds to an intermediate value, which is predetermined for the first movement. At this point the dc motor is turned off but the timing wheel continues to increment the feedback signal as the motor coasts. Should the head be misaligned with respect to the track after the dc motor stops, the final value of the feedback signal is used to modify the intermediate value for the next track-to-track movement. In this way irregularities due to coasting will not accumulate and affect future track-to-track movement.
    • 用于盘播放机的跟踪伺服器控制重放头在由磁盘携带的预先记录的磁迹之间的移动。 反馈信号从连接到直流伺服电机与头部的凸轮和齿轮配置的定时轮提供。 伺服将轨道到轨道的运动分为两个部件:一个部件在直流电机通电时发生,另一个部件在直流电机惯性停止时发生,大概与所需磁道相对。 运动的第一分量继续,直到反馈信号对应于为第一运动预定的中间值。 此时,直流电机关闭,但随着电机惯性滑行,定时轮继续增加反馈信号。 在直流电动机停止之后,如果磁头相对于轨道不对准,则反馈信号的最终值用于修改下一轨道到轨道运动的中间值。 以这种方式,由于滑行而导致的不规则性不会累积并影响未来的轨道到轨道运动。