| 摘要 |
<P>PROBLEM TO BE SOLVED: To realize an adequate focal bias and spherical aberration adjusting method. <P>SOLUTION: It is made possible to appropriately perform necessary adjusting operation, and recording and reproducing operation, by setting an optimal focus bias value and an optimal spherical aberration correction value by observing and detecting the amplitude of a tracking error signal, in a disk driving device incapable of ensuring all the other adjustments, for example, laser power, detailed spherical aberration correction using an RF signal, focus bias correction, or the like. As for the adjusting procedures, a focus bias is set to a predetermined value, and a tracking error signal is observed while varying a spherical aberration correction value, to detect and set the optimal spherical aberration correction value, and thereafter the tracking error is observed while varying the focus bias value, to detect the optimal focus bias value, and by this operation, the optimal values of the focus bias and the spherical aberration correction are detected and set. <P>COPYRIGHT: (C)2004,JPO |
