| 摘要 |
<P>PROBLEM TO BE SOLVED: To prevent a flash from protrusively being formed to the vertical direction, orthogonally to the reading face of a disk substrate, and to make a flash formed lower than the reading face hard to break. <P>SOLUTION: The disk substrate molding die 10 is the one wherein, when the fixed die 31 and the movable die 11 are mated to form the cavity C1, the mirror surface plate 34 is made to be movable in its relative position to the peripheral ring 18 and wherein the mirror surface plate 34 is formed of the peripheral fit-in part 38 which is fitted in the peripheral ring 18 and the annular projection part 39 which is integrally formed with the cavity forming face 37 on the peripheral part of the cavity forming face 37 and has the face 39c which more protrudes from the cavity forming face 37 as it goes toward the peripheral side. <P>COPYRIGHT: (C)2007,JPO&INPIT |
