| 摘要 |
<p>PURPOSE:To restore an actuator to an initial position at the transforming time of an operation mode by providing a stop control means gradually reducing the output voltage of a driving voltage source at a prescribed timing, finally making it to a zero, and restoring an electromechanical transforming element to the initial position corresponding to the mode switching command of an information reproducing device. CONSTITUTION:A dynamic tracking device is provided with the stop control means gradually reducing the driving voltage to autuators 29A and 29B of reproducing heads 28A and 29B at the prescribed timing, finally making it to the zero, and restoring the autuators 29A and 29B to the initial position corresponding to the reproduction stop command of the information reproducing device. In the device by this constitution, since the driving voltage to the actuators 29A and 29B does not suddenly turn to the zero at the reproduction stop, but is reduced gradually, at the transforming time of the reproduction stop, it is possible to accurately restore the actuators 29A and 29B to the initial position by a mode stop control circuit 40A without generating a ringing, and thus, it is possible to control the head moving position at the next mode operation time, and also to prolong the life time of the actuators 29A and 29B.</p> |
