| 摘要 |
<P>PROBLEM TO BE SOLVED: To perform satisfactory recording or reproducing operation by easily and speedly optimizing a focus error detecting state. <P>SOLUTION: By a control part 180, a focus offset signal H is changed and added in an adjustment area, and simultaneously the output of a jitter detecting part 130 is monitored to detect the focus offset amount of a best jitter. Then, the offsets generated in focus error signals F in respective land and groove obtained in the adjustment area are stored in a memory. At the recording/ reproducing operation, when moved to the land or groove area, such an operation is carried out that the offset amounts optimum for each previously stored in the memory are added to the focus error signals F as a signal H. Thus, the recording/reproducing operation is performed in the state the optimum focus state is maintained for each. <P>COPYRIGHT: (C)2003,JPO |
