| 摘要 |
PROBLEM TO BE SOLVED: To suppress or stop the speed of a pickup and to more accurately control the moving speed by driving a second driving device by the opposite phase of the vibration of the pickup based on the output of a detection circuit for detecting the vibration of the pickup when a thread is moved. SOLUTION: Off track signals OT outputted by a signal processing circuit 7 based on the output of the pickup 3 are inputted to a vibration detection circuit 10 as well. An opposite phase calculation circuit 12 is a delay circuit for performing output for which the phase is shifted from input signals for 180 deg. or an inversion circuit for inverting the polarity of the input signals and the vibration detection circuit 10 detects the vibration of the pickup 3 accompanying the movement of the thread 4 and outputs the signals of the opposite phase of a detected result to a control circuit 8. The control circuit 8 outputs a driving instruction TD2 to a second actuator 6 based on the output of the vibration detection circuit 10, supplies the driving force of the opposite phase of the vibration for canceling the detected vibration to the pickup 3 and suppresses or stops the vibration.
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