| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a disk-shaped optical recording medium which hardly slips when being handled by user's finger. <P>SOLUTION: In the optical disk 10, an information recording surface 13 provided on at least one disk surface of a disk-shaped base body is covered by a light transmission layer, a center hole 15 is provided in the center part of the disk-shaped base body and a concentric rough surface 9 is provided on the surface in the vicinity of the center hole. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
