| 摘要 |
PROBLEM TO BE SOLVED: To prevent defective molding from being generated on the surface of a disc base. SOLUTION: This mold for molding is provided with a base plate, a mirror block, a stamper 32, an inner stamper holder 33, an annular inner peripheral face 85 for forming the outer periphery of a disc base and a seal face S6 for preventing a resin in a cavity space from being leaked when filling is performed. In addition, a cavity ring 64 being freely removably fitted on a mirror block and holding the outer peripheral edge of the stamper 32 and a cavity ring fixing means being freely moved back and forth in the removing direction of the cavity ring 64 and selectively pressing the cavity ring 64 on the mirror block accompanied with moving back and forth is provided. It is possible thereby to prevent an outside part in the radial direction of the stamper 32 from being floated up from the mirror block when a movable mold 12 is moved backward during the mold is opened. |
