Method for manufacturing glass substrate for magnetic disk
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United States of America Patent
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Oct 6, 2015
Grant Date -
Mar 6, 2014
app pub date -
May 23, 2012
filing date -
May 23, 2011
priority date (Note) -
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Abstract
A method for manufacturing a glass substrate for magnetic disk, the internal strain of which is reduced without performing annealing treatment, is provided. The method includes a forming process of forming a plate-shaped glass blank by pressing a lump of molten glass using a pair of dies, wherein the method includes: a removing process of removing at least a part of a residual stress layer formed on the principal face of the glass blank press-formed in the forming process; and a process of forming a donut-shaped glass substrate by subjecting the glass blank after the removing process to machining.
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