| 摘要 |
PURPOSE:To obtain a mold for molding a disc, which has no obstacle even if a stamper where it has no chamfering finish processing or that where a deformation is generated on end faces of an inner and outer circumferences at the time of blanking processing is used, by a method wherein annular grooves are provided respectively in the upper fringe part of an inner circumference and the bottom of a collar part of a stamper holder of a movable mold. CONSTITUTION:A lower annular groove 14 is provided in an upper fringe part of an inner circumference of a mirror surface part 5 of a movable mold 3. An upper annular groove 13 is provided further in the bottom of a collar part 8 of an inner circumferential stamper holder 7. For example, a stamper 6 which has generated a deformation on end faces of an inner and outer circumferences at the time of blanking processing is fixed on the mirror surface part 5 of the movable mold 3 and its inner circumferential part and outer circumferential part are held respectively by the inner circumferential stamper holder 7 and an outer circumferential stamper holder 9. However, since a deformed amount of the stamper 6 flees into the lower annular groove 14, no obstacle is generated to molding of a disc. |
