| 摘要 |
An object of the present invention is to provide a mold for molding, a molding method, and a molding machine in which generation of burrs on a disc substrate can be prevented to thereby enhance quality of the disc substrate, as well as a disc substrate molded by the same. The mold for molding includes a mirror-surface disc ( 16 ); a stamper ( 29 ) having a hole formed at its center, and attached to the front end surface of the mirror-surface disc ( 16 ); and an inner holder ( 60 ) for holding the stamper ( 29 ) by means of press fit into the hole. In the course of the press fit, at least either the stamper ( 29 ) or the inner holder ( 60 ) is subjected to stress in excess of its yield point and plastically deformed. In this case, the inner holder (60) is press-fitted into the hole of the stamper ( 29 ) to thereby hold the stamper ( 29 ), thereby eliminating need to form a holding portion at the outer circumferential edge of the front end of the inner holder ( 60 ). Accordingly, an associated groove is not formed on the disc substrate. Thus, a print region on the disc substrate can be increased.
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