| 摘要 |
PURPOSE:To stop a deck part accurately at a desired position by using a detection/control means which shifts at a fixed speed the deck part containing a loading mechanism that transfers a disk with its store part. CONSTITUTION:A deck part 5 includes a loading mechanism 3 which unloads and loads a disk 2 from and to a store device 1 and a reproduction part 4. When an optional disk is retrieved, a differentiator 10 obtains a time change of the output of a potentiometer 9 according to the difference between a desired position and the position of the part 5. Then an operational amplifier 11 controls a motor 6 in response to the degree of said time change. Thus the part 5 is shifted at a fixed speed regardless of the degree of mechanical friction due to a change of the ambient temperature. Then a switch 12 is turned on and off while counting on an overrun extent of the part 5. Thus the part 5 can be stopped accurately at a desired position. |
