| 摘要 |
PURPOSE:To attain accurate tracking immediately after seeking by applying force proportionate to acceleration of movement of an optical head to an objective lens by a tracking actuator. CONSTITUTION:When seeking, an optical head 16 is shifted in the direction a-a' by a driving means. At this time, acceleration of the optical head 16 is detected by an acceleration sensor 18, and the output of the acceleration sensor is made to a form S2 that controls a tracking actuator 14 by an acceleration detecting circuit 30. A switch 26 is switched to the state reverse to the state shown in the figure. The signal S is amplified by a driving amplifier 28, and the tracking actuator 14 is driven by the amplified signal, and controlled to make the optic axis of an objective lens 12 coincide with the optic axis of an optical system of the body side of the optical head 16.
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