| 摘要 |
In an optical disk device in which the focus offset for writing of data can be optimized, a mark is written onto an optical disk at a predetermined focus offset and a change in the signal quality is detected by replaying the mark at various focus offsets. The predetermined focus offset is adjusted based on the change in the signal quality so that the focus offset is set at an optimal value. When an error rate is employed to represent the change in the signal quality, a range of focus offset in which the error rate does not exceed a predetermined value is found. By adjusting the predetermined focus offset for the reference optical disk based on the detected range of focus offset, an optimal focus offset is set.
|
