| 摘要 |
PROBLEM TO BE SOLVED: To shorten a working time for focus bias adjustment by obtaining a 1st adjustment value by adjusting a focus bias to one type of optical disk among two or more types of optical disks, and adjusting the focus bias to the other kinds of optical disks by calculating an adjustment value of the other optical disks from the 1st adjustment value. SOLUTION: The optical disk device 10 is provided with an optical pickup 1 having an aberration-corrected object lens, and is configured to be able to reproduce the data of two or more types of optical disks 9 of different specifications, for example, CD and DVD. A focus tracking driver of a driver part 7 uses an adjustment value which is obtained by focus bias adjustment as a reference value for setting the focus servo at the manufacture of the optical disk device 10. Based on a 1st adjustment value for the focus bias adjustment to DVD, the optical disk device 10 calculates a 2nd adjustment value for the focus bias adjustment to CD.
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