| 摘要 |
PROBLEM TO BE SOLVED: To provide an optical disk device capable of optimally and safely adjusting the focal point of an optical pickup even in a situation where the establishment of PLL synchronism is not guaranteed. SOLUTION: While varying the adjusted value of the focal point of an optical pickup, among focal points, a focal point where the amplitude of a reproduced RF signal is maximum and a focal point where the jitter amount of the reproduced RF signal is minimum are determined. When the focal point of the minimum jitter amount is within a permissible range set with the focal point of the maximum RF amplitude as a reference, the focal point of the minimum jitter amount is employed as an adjusting result. When it is not within the permissible range, the focal point of the maximum RF amplitude is employed as an adjusting result. COPYRIGHT: (C)2005,JPO&NCIPI
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