| 摘要 |
There is provided an optical disk apparatus having a function of speedily calculating the amount of optical axis misalignment of an optical pickup to allow a wobble signal to be obtained early when initially spinning up an optical disk. Servo control means 27 turns the focusing servo on while turns the tracking servo off when initially spinning up an optical disk. In this state, optical axis misalignment calculating means 28 calculates the amount of optical axis misalignment X by a calculation formula X=[(A+B)-(C+D)]/(A+B+C+D) [%]. Subsequently, offset adding means 29 adds an offset value according to the amount of optical axis misalignment X to a tracking drive voltage after turning the tracking servo on. Then, wobble detecting means 30 detects a wobble signal by (A+B)-(C+D) after the offset value is added.
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