| 摘要 |
PROBLEM TO BE SOLVED: To realize stable track servo in accordance with variations in amplitude of a tracking error signal. SOLUTION: In the case of coarse seek (YES in S5), a tracking error signal in coarse seek is measured (S10) and when the measured signal is larger than the prescribed signal level (YES in S10), the gain of the tracking signal is reduced (S11), and when the measured signal is smaller than the prescribed signal (NO in S10), the gain of the tracking error signal is raised (S12). Also in the case of fine seek (NO of S5), rack jump driving an objective lens is performed (S8). Then, the tracking error signal is measured (S10), when it is larger than the prescribed signal level (YES in S10), the gain of the tracking error signal is reduced (S11), when it is smaller (NO in S10), the gain of the tracking error signal is raised (S12). COPYRIGHT: (C)2005,JPO&NCIPI
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