| 摘要 |
A pull-in point setting circuit 16 sets the intermediate value between the maximum value and minimum value of the focus error signal of a layer 1 as the pull-in point of a focus servo action in advance of the playback of an optical disk 11. At a layer jump before the automatic adjustment of a focus bias, the focus servo action is pulled in at the set point. Thus, the layer jump can be reliably effected even before the adjustment of the focus bias.
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