| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an optical disk which can remove or restore any crack or foreign substance without contracting the life of the optical disk. <P>SOLUTION: A CD1 is configured with a main part of the disk 7 and a separation protection layer 8 which can be attached and detached to/from the main part of the disk 7. The main part of the disk 7 has a structure where, from the separation protection layer side, a fixed protection layer, a data layer, a reflective layer, a protective film and a label layer are sequentially laminated. Projection parts 15, 16 are arranged in a core part 3a of the separation protection layer 8. On the other hand, hole parts 17, 18 are formed in a core part 3b of the main part of the disk 7. By making the projection parts 15, 16 to be in engagement or fitting with the hole parts 17, 18, the separation protection layer 8 is attached to the main part of the disk 7. <P>COPYRIGHT: (C)2007,JPO&INPIT |
