| 摘要 |
PURPOSE:To enable a head to be accurately stopped at a predetermined position, by once stopping a DC motor being rotated when the first detection point of an operating element is detected by a sensor, thereafter driving the motor by pulses, and thereafter stopping the motor when a second detection point is detected. CONSTITUTION:When a DC motor 7 is rotated in the direction of an arrow (a) and the first detection point alpha of an operating part 10a of a turnable lever 10 comes into a recessed part of a sensor 8, a sensor circuit block 20 generates a position detection signal, and a driving current for the motor 7 is cut off based on the signal, thereby rapidly stopping the motor 7. Thereafter, pulses generated by a motor-controlling block 22 are supplied to the motor 7 through a motor-driving block 23 to rotate the motor 7 at a low speed. When the second detection point gamma of the operating part 10b is passed through the recessed part of the sensor 8, the sensor circuit block 20 generates a position detection signal, whereby the generation of the pulses is topped, and a reverse current driving signal for braking is supplied from a braking timing block 24 to the motor 7. |
