| 摘要 |
PURPOSE:To make the device stable against the disturbance of the friction, the play, etc. of a transmitting system and the secular change and to improve the reliability, by performing the control so that an information track to be traced is always placed within the control range of an actuator for AC tracking control. CONSTITUTION:A disc 1 is rotated with a certain rotation frequency by a disc rotating motor 2. A pickup 3 is driven in the radial direction of the disc by a DC motor 4. The pickup 3 is provided with an optical system 13, an information signal detectors 14, a tracking error signal detector 15, and an actuator 16, and the information signal detected by the information signal detector 14 is supplied to an information signal processing circuit. An error signal for AC tracking is supplied to an AC tracking control circuit 7, and the actuator 16 of the pickup 3 is driven in accordance with this signal to perform the AC tracking control, and the information track is traced by light. |
