| 摘要 |
PURPOSE:To eliminate the effect of disturbance which is incidentally occurred on the surface of a disk, by adding the low frequency component of a tracking servo motor, a signal proportional to the number of revolutions of disk, and the speed signal of a feed motor, to a feed servo motor. CONSTITUTION:The information supplied from a disk 1 is converted into a signal by a signal detector 7 and supplied to an adder 18 via DC amplifier 11 and a low pass filter 14. While the revolution speed signal of a spindle motor 2 produced by a revolution speed detector 19 and a speed detector 17 of the motor 2 plus a feed motor speed signal of a feed control motor 10 produced by a speed detector 16 are supplied to the adder 18. The output of the adder 18 is supplied to a drive amplifier 15 to control the motor 10. Thus a stable tracking feed controller which is not affected by the disturbance occurred incidentally on the surface of a disk is obtained. |
