| 摘要 |
Rotation synchronization detection means is provided which detects a specified rotational phase having a period of one revolution of an optical disk. An output of the rotation synchronization detection means is synchronized with an output of rotation phase detection means for detecting a rotation phase on the basis of a FG signal and thereafter, information of surface vibration component and eccentricity component is memorized in memories before a sleep process in accordance with the output of the rotation phase detection means or a timing until jump is determined in accordance with the output of the rotation phase detection means and during recovery from the sleep status of stopping the disk once, the output of the rotation synchronization detection means is again synchronized with the output of the rotation phase detection means adapted to detect the rotation phase on the basis of the FG signal.
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