| 摘要 |
PURPOSE:To decrease the number of the assembly adjustment areas and to reduce the cost, by obtaining the arm position information (lead-in and lead-out positions) by counting the driving signals existing from the reference position through the present position of the arm. CONSTITUTION:A play button on a keyboard 3 is pushed when a tone arm 11-1 is at the rest position. Thus the signal is fed to a computer 6 from an input interface circuit 12. The computer 6 performs a prescribed process of data. A horizontal motor driving circuit 8 for tone arm is driven, and a pulse motor 10 is driven. The number of pulses equivalent to the revolutions of the motor 10 and covering from the rest position through a 30cm lead-in position is applied previously to the computer 6. The motor 10 is stopped at a time point when the count value of the pulses reaches a prescribed level. Then a tone arm up-down driving circuit 7 is driven to turn on a solenoid 9. The tone arm 11-2 is moved down to trace a record disk. |
