| 摘要 |
PROBLEM TO BE SOLVED: To provide a means detecting aberration caused by slopes of an optical disk and an objective lens and correcting it. SOLUTION: Aberration generation parts 8, 9 are set up on the way of an optical path from a semiconductor laser 2 to the optical disk 3, e.g. in a light convergent or divergent part. The aberration generation parts 8, 9 are constituted of transparent parallel planes, and are constituted so as to be inclinable around prescribed axes facing in the direction nearly vertical to each other. Then, the aberration caused by the slopes of the optical disk 3 or the objective lens 12 are canceled by the aberration caused by properly inclining the parallel planes 8, 9. Thus, information is recorded/reproduced stably even when the optical disk 3 or the objective lens 12 is sloped. |
