Method for manufacturing a magnetic disk comprising a glass substrate using a protective layer over a glass workpiece
AssigneeAsahi Glass Company, Limited
InventorChristopher H. 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.
Claims17
A method for manufacturing a substrate for a magnetic disk, comprising:
- applying a protective overcoat over a sheet of material;
- cutting the sheet of material into workpieces after said applying said protective overcoat;
- stacking said workpieces on top of one another to form a stack of workpieces;
- cutting said stack of workpieces to form a stack of circular disk substrates, said circular disk substrates being unchamfered, said substrate being one of said substrates within said stack;
- polishing the corners and edges of the circular disk substrates within the stack, wherein the corners and edges of the substrate are rounded;
- unstacking said stack of circular disk substrates;
- and
- removing said protective layer from each of said substrates.
A method for manufacturing a substrate for a magnetic disk comprising:
- applying a protective overcoat over a sheet of material;
- cutting the sheet of material into circular disk substrates, said substrates being unchamfered;
- stacking said circular disk substrates on top of one another to form a stack of substrates;
- polishing the corners and edges of the circular disk substrates within the stack, wherein the corners and edges of the substrates are rounded,
- unstacking said stack of circular disk substrates;
- removing said protective layer from each of said substrates.
Dependencies are inferred from the claim text.