Arm driving device in linear tracking pickup apparatus

摘要

Apparatus for controlling a tone arm in a record playing device of the linear tracking pickup type includes a pair of guide rails; a carriage slidably mounted on the guide rails; a pickup assembly mounted on the carriage and including a support mechanism for supporting the tone arm for horizontal movement with respect to a record disc; a linear drive motor for linearly driving the carriage along the guide rails in the horizontal direction with respect to the record disc; a motor drive circuit for controlling the energization of the linear drive motor; an offset angle detecting device for detecting an offset angle of the tone arm and for generating an offset angle output in response thereto; a first switch circuit for supplying the offset angle output to the motor drive circuit when the tone arm traces the record disc to drive the linear drive motor so as to compensate for the detected offset angle; an inclination detecting circuit for detecting an inclination of the carriage with respect to the record disc and for generating an inclination output in response thereto; and a second switch circuit for supplying the inclination output to the motor drive circuit when the tone arm is lifted from the record disc to prevent undesirable linear movement of the carriage.