| 摘要 |
PURPOSE:To prevent scoring between a stationary mold and movable mold from being generated at the time of mold clamping in an optical disc mold. CONSTITUTION:A stamper 76 is fitted to a stationary mold 71. An outer cucumferential part of the stamper 76 is pressed on a movable mold 72 side by a stamper weight 78. In the movable mold 72, a cylindrical movable core lining 83 is fitted into a stationary core lining 82 in a state capable of performing an up-and-down motion. The stationary core lining 82 abuts against the stamper 76 at the time of mold clamping. At the time of compression of resin on the inside of the cavity 73, the movable core lining is pressed in the direction of the stationary mold. Hereby, the stamper weight 78 which has been formed covnentionally the outer circumferential surface of the cavity 73 is made irrelevant to the cavity 73. Hereby, in the stationary mold 71 and movable mold 72, parts which are to come into contact with each other by piling upon a direction meeting at right angles with clamping and breaking direstions are eliminated. |
