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US 8,127,433 B2Granted
Method of manufacturing a glass substrate for magnetic disk
AssigneeHoya Corporation
InventorYoshinori Marumo
Life of this patent
Estimating the term…
Abstract
In a manufacturing method of a glass substrate for a magnetic disk including a cleaning process of the glass substrate, the cleaning process includes a process of contacting the glass substrate with a cleaning solution containing a compound, such as thioglycolic acid or a thioglycolic acid derivative, having a thiol group as a functional group.
Claims16
A method of manufacturing a glass substrate for a magnetic disk including at least a cleaning process of the glass substrate, wherein:
- the cleaning process includes;
- (1) preparing a cleaning solution containing a compound having a thiol group as a functional group to chemically clean a surface of the substrate by a dissolving treatment,
- (2) contacting the glass substrate with the cleaning solution to chemically remove iron oxide-based foreign matter adhering to the surface of the substrate.
Dependencies are inferred from the claim text.