Method for producing glass substrate for magnetic disk and method for producing magnetic disk
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United States of America Patent
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Apr 9, 2013
Grant Date -
Nov 12, 2009
app pub date -
Sep 12, 2007
filing date -
Sep 29, 2006
priority date (Note) -
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Abstract
The present invention provides a method for producing a glass substrate for a magnetic disk in which the occurrence of micro-waviness on the glass substrate is prevented in a cooling step after a chemically strengthening step so that the glass substrate has a significantly smooth principal surface, and provides a method for producing a magnetic disk in which head crash, thermal asperity failures, and the like are prevented, the flying height of a magnetic head can be decreased, and high-density recording is enabled.
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