| 摘要 |
PURPOSE:To tune a main motor and an optical motor by calculating the rotating speed of the motor from that of a drum, calculating the calculated rotating speed data, and applying a reference clock in response to the result to a PLL circuit for driving the optical motor. CONSTITUTION:Since a drum 12 is driven by a belt drive or gear drive by a main motor M1, the rotating speed of the drum 12 is proportional to that of the motor M1, and the rotating speed of the motor M1 can be calculated from that of the drum. A processor 20 takes a moving average of the second main motor speed data N1 and the third main motor speed data N2. It is further calculated with the average result as a base, and if the speed of an optical motor M2 obtained as a result of the calculation is N1, the processor 20 outputs a clock to becomes that the rotating speed of the motor M2 is N1 to a PLL circuit 21. Thus, the motor M2 is tuned and driven. |
