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
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Sep 30, 2014
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app pub date -
Mar 30, 2012
filing date -
Mar 31, 2011
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Abstract
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 concave shape with respect to the dropping path of the lump.
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