Method for manufacturing a magnetic disk comprising a glass substrate using a protective layer over a glass workpiece
AssigneeAsahi Glass Company, Limited
InventorChristopher M. Bajorek
Life of this patent
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Abstract
A method for manufacturing a glass substrate for use in magnetic disk manufacturing comprises the steps of a) forming a glass sheet; b) forming a protective sheet over one or both sides of the glass sheet; c) cutting the glass sheet into workpieces; d) cutting the workpieces into disk-shaped substrates; e) subjecting the edges of the substrates to an edge polishing process; and f) removing the protective layer. Of importance, by leaving the protective layer over the substrate, the substrate surface is protected from damage.
Claims26
A method for manufacturing a substrate comprising:
- applying a protective overcoat over a sheet of material;
- cutting the sheet of material into workpieces after said applying said protective overcoat;
- cutting the workpieces into disk-shaped substrates;
- and
- removing the protective overcoat after said cutting of the workpieces into disk shaped substrates.
A method for manufacturing a substrate comprising:
- applying a protective overcoat over a sheet of material;
- cutting the sheet of material into disk-shaped substrates;
- and
- removing the protective overcoat after said cutting of the sheet of material into disk shaped substrates.
Method comprising:
- applying a protective layer to a workpiece prior to performing a step in which the workpiece surface would otherwise be subjected to mechanical damage;
- subjecting the workpiece to a process step during which the protective layer protects the workpiece from mechanical damage;
- removing the protective layer;
- and
- wherein at the end of said method, said workpiece is formed into a substrate for a magnetic disk.
Dependencies are inferred from the claim text.