| 摘要 |
PURPOSE:To improve the stability of a control system, by driving and controlling an optical means by changing a control ratio appropriately by a control means corresponding to the detecting signal, etc., of a detecting means. CONSTITUTION:A detector 97 detects the position of a movable part 91 (optical head 3) by a so-called lap grid type detecting system, and the output signal of the detector 97 is supplied to a linear motor control circuit 9. The linear motor control circuit 9 performs the position control of the optical head 3 corresponding to a target position signal supplied from a CPU5 and the output signal of the detector 97, and also, detects the travel distance of the optical head 3 by the output signal of the detector 97, and performs the velocity control of a linear motor 21 corresponding to the travel distance. In such a way, it is possible to obtain a stable operation by obtaining the optimum loop gain for the operation of an information reproducing device, for example, each operating state of focusing control. |
