| 摘要 |
PROBLEM TO BE SOLVED: To provide an optical disk device capable of performing a stable servo operation in a data area where a track pitch is more thanλ/NA. SOLUTION: A servo controller 14 has a focus servo section 141 which performs focus servo and a track servo section 142 which performs track servo. A focus offset setting section 17 sets a focus offset value for the focus servo section 141. The focus offset setting section 17 changes over a first focus offset value 171 and a second focus offset value 172 in the data area where the track pitch is more thanλ/NA and sets the value in the focus servo section 141. The focus offset setting section 17 changes over the focus offset value by, for example, a track servo on and a track servo off. COPYRIGHT: (C)2009,JPO&INPIT
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