Method for producing glass substrate for information storage medium, and information storage medium
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United States of America Patent
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Jan 27, 2015
Grant Date -
Jul 25, 2013
app pub date -
Sep 13, 2011
filing date -
Sep 30, 2010
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Abstract
For an information storage medium a glass substrate is produced in a method including the steps of: polishing a glass substrate with a polishing agent applied thereon; and subsequently, chemically strengthening a major surface of the glass substrate. The polishing agent contains cerium oxide at a purity equal to or larger than 99% by mass for CeO2/TREO, and has an alkaline earth metal content having a total mass equal to or smaller than 10 ppm by mass. The step of polishing is performed with a soft polishing pad to polish the glass substrate.
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