| 摘要 |
PURPOSE:To prevent biting of gears and to eliminate erroneous operation when a disk player loading means is restarted, by reversely rotating the motor which drives the loading means for a prescribed period after the motor is stopped. CONSTITUTION:To a loading gear which loads a disk, rotational movement of a motor 7 is transmitted through a pulley, rubber belt, and worm gear. The motor 7 is driven by transistors (TR)8-11 and, when the loading operation is completed, the motor 7 is mechanically locked. When the motor 7 is locked, the terminal voltage of a resistance (R)14 rises and the rise is transmitted to a microprocessor 13. Outputs (a) and (b) of the microprocessor 13 are supplied to diodes (D)17 and 18 and, at the same time, inputted in monostable multivibrators 15 and 16. AND of outputs of the monostable multivibrators 15 and 16 delayed by prescribed times through Ds 19 and 20 and through Ds 17 and 18 is obtained and impressed upon bases of the TRs 11 and 10. Therefore, the motor 7 is reversely rotated for a prescribed period after it is stopped and biting between the gear and worm can be prevented. |
