| 摘要 |
PURPOSE:To prevent a molded part of a stamper from deforming through a bend which is on the fringe part of the external circumference of the stamper at the time of molding, by making a stamper holding structure in a non- contacting state of a specific form. CONSTITUTION:An annular recessed groove part 48 with which the fringe part 32 of the external circumference of a stamper 30 does not come into contact is formed in the inside of a fitting collar part 46 of a press ring 45 for pressing the stamper 30, and a recessed sunk part 23 with which the fringe part 32 of the external circumference of the stamper 30 does not come into contact is formed on a stamper holding mold 20. With this stamper holding structure, at the time when the stamper is held by the molds 20, 10, the fringe part 32 of the external circumference of the stamper 30 is held under a state where the same does not come into contact with either of a press ring 45 and the holding mold 20. Therefore, it does not happen that the molded stamper 30 becomes a distorted and deformed disk through a bend or burr at the time of molding of the disk, even if the bend or the burr is on the fringe part 32 of the external circumference of the stamper. |
