| 摘要 |
<p>An optical disk unit (2001) comprising a reflection surface detection means (1010) for detecting a reflection surface, a focus control means (1202, 1003, 1009, 1008, 1003, 1012, 1005, 1204) for performing a focus control on a reflection surface so that the distance between the focal point of a light beam applied to an optical disk (2100) and the reflection surface falls within a specified error range, a moving means (1007) for moving the position of the light beam's focal point vertically with respect to the optical disk, and a control means (1006) for control the focus control means and the moving means.</p> |
