| 摘要 |
PROBLEM TO BE SOLVED: To obtain an optical disk and its injection compressing molding metallic mold capable of preventing a printing plate from damage without improving the precision of a metallic mold structure. SOLUTION: In the optical disk Da being an embodiment, a ring-like projected part Dr is formed in the printing surface side of the outer peripheral part in the somewhat inside from the outer peripheral edge. Also, the metallic mold, having structure in which a ring-like groove 1070 is formed on the inner surface of a reading side mirror 1022A in the vicinity of the sliding part J between the reading side mirror 1022A and a cavity ring 1040, is used in order to obtain the optical disk substrate Da. |
