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AssigneesSumitomo Heavy Industries, Ltd., Seikoh Giken Co., Ltd.
InventorsYuichi Inada, Yasuyoshi Sakamoto
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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.
A mold for molding, characterized by comprising:
A mold for molding, characterized by comprising:
A molding method for molding an article by means of a mold for molding comprising a first mold assembly, a second mold assembly, and a stamper provided in at least either said first or second mold assembly and having a fine pattern formed thereon, said molding method being characterized by comprising:
A disc substrate according to claim 13, wherein a wide, depression-free region ranging from its inner circumferential edge to its outer circumferential edge serves as a print region.
Dependencies are inferred from the claim text.