| 摘要 |
In order to perform stable focusing jump in accordance with the wobble of a disk, an optical pickup is moved radially inward toward a central area of the disk where the amount of wobble is small. A focusing error signal in accordance with wobble is feed-forwarded during focusing jump so as to also follow the wobble during the focusing jump. Furthermore, the position of an objective lens is maintained while waiting for the signal recording surface of the disk to reach a focus position due to wobble. In addition, the rotation speed of the disk is controlled in accordance with the amount of wobble.
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