| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a disk-like optical recording medium constituted so as to improve chucking property by a driving member on the device side and to prevent peeling of a light transmission layer when the disk-like optical recording medium with a center hole is attached to a recording and reproducing device. <P>SOLUTION: The disk-like optical recording medium is constituted so that this optical disk 10 is provided with a disk-like base 11, an information recording surface 13 formed on at least one surface of the base, the light transmission layer 12 which covers the information recording surface and the center hole 15 positioned at the center of the disk-like base and the center hole has an inclined surface 16 inclined from the surface of the light transmission layer side so that diameter d2 on the light transmission layer side of the center hole becomes larger than diameter d1 on the opposite side of the light transmission layer and no boundary between the base and the light transmission layer is positioned in the inclined surface. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
