Manufacturing method of a sheet glass material for magnetic disk and manufacturing method of a glass substrate for magnetic disk

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United States of America Patent

PATENT NO 8800320
APP PUB NO 20130074550A1
SERIAL NO

13435713

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Abstract

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A manufacturing method of a sheet glass material for magnetic disk, the method includes, dropping process for dropping a lump of molten glass; pressing process for sandwiching simultaneously the lump from both sides of the dropping path of the lump with surfaces of a pair of dies facing together, and performing press forming to the lump to obtain a sheet glass material, wherein at least one of the pair of dies has a convex shape with respect to the dropping path of the lump.

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Patent Owner(s)

  • HOYA CORPORATION

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Isono, Hideki Kofu, JP 44 819
Tanino, Hidekazu Akishima, JP 10 68

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