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    • 1. 发明申请
    • IMPROVEMENTS IN PHONOGRAPH PICKUP ARMS
    • PHONOGRAPH PICKUP ARMS中的改进
    • WO1982001956A1
    • 1982-06-10
    • PCT/AU1981000173
    • 1981-11-27
    • CHIDZEY WILLIAM JCHIDZEY JOHN A
    • G11B03/38
    • G11B3/08512G11B3/38
    • A pickup arm assembly for gramophone disc records comprises a pickup arm (6) pivotally mounted to a driven arm (8) movable about an axis substantially parallel to the axis of rotation of the record disc (A). The pickup arm pivot (7) carries a target (11) which coacts with a position sensor (12) mounted on the driven arm (8) to sense changes in the angle subtended between the pickup arm (6) and the driven arm (8). The position sensor (12) provides a signal corresponding to any deviation of the angle from a desired predetermined angle to operate drive means (9) for the driven arm (8) to thereby move the arm in a direction to reduce such deviation. The relationship of the position sensor (12) to the driven arm (8) may be varied in accordance with variations in the position of the driven arm (8) to reduce or illuminate tracking errors.
    • 用于留声机唱盘记录的拾音臂组件包括枢转地安装到从动臂(8)的拾取臂(6),该从动臂可绕基本上平行于记录盘(A)旋转轴线的轴线移动。 拾取臂枢轴(7)承载与安装在从动臂(8)上的位置传感器(12)共同作用的目标(11),以检测拾取臂(6)和从动臂(8) )。 位置传感器(12)提供对应于角度与期望的预定角度的任何偏差的信号,以操作用于从动臂(8)的驱动装置(9),从而沿着减小这种偏差的方向移动臂。 位置传感器(12)与从动臂(8)的关系可以根据从动臂(8)的位置变化来改变,以减少或照亮跟踪误差。