| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an optical disk drive capable of performing focus pull-in operation directly on a target layer in a multilayer disk. <P>SOLUTION: Focus off-set adding means 250b adds an offset to a focus error signal. According to the added off-set amount, focus balance adjusting means 250a corrects the focus balance to be the same optimum balance as one before the focus off-set adding. <P>COPYRIGHT: (C)2013,JPO&INPIT |
