| 摘要 |
PROBLEM TO BE SOLVED: To record high-quality data on an optical disk by performing high accurate focus balance adjustment even when data is not recorded on the optical disk in the focus balance adjustment to a non-recorded disk. SOLUTION: This optical disk unit is equipped with a maximum amplitude measuring means 7 which uses a tracking positional error signal detected when laser beams for irradiation are focused on an optical disk 1 and not detected when the laser beams are not focused on the optical disk as a signal obtained from the optical disk 1 in addition to a reproduced signal and detects the amplitude level of the generated tracking positional error signal and the optical disk unit applies the focus balance adjustment to the non-recorded disk so that the amplitude of a tracking positional error signal becomes the maximum. COPYRIGHT: (C)2005,JPO&NCIPI
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