Method of manufacturing a 2-5 inch diameter glass substrate for a magnetic disk
AssigneeSaatec Engineering Corporation
InventorYasuaki Sakamoto
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Abstract
A method of manufacturing a 2-5 inch diameter glass substrate for a magnetic disc in which a plate glass is press molded using a mold formed of a super-hard material and having a surface of a prescribed roughness. Ion implantation using nitrogen ions is performed on the surface of the mold, after which ion implantation using palladium ions, platinum ions, and carbon ions is performed in the order given. Finally, the surface of the mold is coated with a graphite or amorphous diamond-like carbon coating.
Claims6
A method of manufacturing a 2-5 inch diameter glass substrate for a magnetic disc, comprising the steps of:
- performing nitrogen ion implantation in the surface of a mold formed of a super-hard material and having a prescribed flatness and a inner diameter;
- performing ion implantation with palladium ions, platinum ions, and carbon ions in the order given;
- forming a graphite or amorphous diamond-like carbon coating on the surface of the mold;
- and
- pressing a disk-shaped plate glass with the mold, the plate glass having a prescribed weight and a diameter smaller than the inner diameter of the mold, to form the 2-5 inch diameter glass substrate having a prescribed thickness.
A method of manufacturing a 2-5 inch diameter glass substrate for a magnetic disc, comprising the steps of;
- performing nitrogen ion implantation in the surface of a mold formed of a super-hard material and having a prescribed flatness and an inner diameter;
- performing ion implantation with palladium ions, platinum ions, and carbon ions in the order given;
- forming a graphite or amorphous diamond-like carbon coating on the surface of the mold;
- and
- pressing a disk-shaped plate glass with the mold, the plate glass having a diameter smaller than the inner diameter of the mold, to form the 2-5 inch diameter glass substrate of a prescribed thickness.
Dependencies are inferred from the claim text.