US 6,664,503 B1 · Method for manufacturing a magnetic disk

Abstract

A method for manufacturing a magnetic disk comprises the step of applying a continuous laser beam to both sides of a glass workpiece and etching both sides of the workpiece with an aqueous acidic fluoride-containing etching solution. The portion of the workpiece receiving the laser beam etches at a much faster rate than the portions of the workpiece that were not exposed to the laser beam. The workpiece is then broken along a line or curve formed by the above-mentioned steps. The resulting structure is a substrate used to form a magnetic disk. The disk is completed by depositing an underlayer, a magnetic layer and a protective overcoat on the substrate.

Claims14

Dependent claims

A method comprising:

applying a beam of radiant energy to a first side of a portion of a workpiece, said radiant energy forming a protrusion at the location where said radiant energy is applied to said workpiece;
etching said workpiece to form a groove where said radiant energy was applied to said workpiece;
and
separating said workpiece into separate regions along said groove.

1 more element

Dependencies are inferred from the claim text.

Facts

Application

09/407,630Filed 28 Sep 1999 · continuation in part

Priority

7 Sep 1999

Granted

16 Dec 2003

Term ends

Not estimatedThe source records don’t support an estimate.

Classification8 codes

C03B 23/02
Re-forming shaped glass: re-forming glass sheets
C03B 33/04
Cutting or splitting sheet glass or ribbons; Apparatus or machines therefor: cutting or splitting in curves, especially for making spectacle lenses
C03C 15/00
Surface treatment of glass, not in the form of fibres or filaments
C03C 23/0025
By irradiation: by a laser beam

Method for manufacturing a magnetic disk

Life of this patent

Method for manufacturing a magnetic disk

Life of this patent

Abstract

Claims14