| 摘要 |
PROBLEM TO BE SOLVED: To provide a disc molding apparatus which can contract a movable side housing, which can prevent occurrence of an eccentricity, a scuff or a contaminant and further which can easily and efficiently generate an ultra-thin disc board, and to provide a method for manufacturing the disc substrate. SOLUTION: The disc molding apparatus comprises a fixed mold and a movable mold which can be closed and opened in a thickness direction of a molded disc. The apparatus presses a molten resin filled in a cavity formed of the fixed mold and the movable mold by the movable mold to form the disc, and punches a central part of the disc to form a hole. The apparatus further comprises a protrusion formed integrally with the movable mold to punch the central part of the disc on an end plate of the movable mold. |
