Method for manufacturing magnetic hard disk
US5705234A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 7, 1997 |
| Grant date | Jan 6, 1998 |
| Priority date | — |
| Expiry date | Jan 7, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/8404
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An object of the present invention is to provide a method for manufacturing a magnetic hard disk wherein a magnetic material layer adhered on a surface of a substrate of the magnetic hard disk has a flat surface. A method for manufacturing a magnetic hard disk comprising steps of: structurally transforming a surface of an amorphous Ni--P alloy film layer formed a substrate (10) of the magnetic hard disk; and adhering a magnetic material layer on the surface of a substrate (10), wherein the step of structurally transforming the a-Ni--P alloy film layer is a step of heating only a desired portion of the surface of the substrate (10) by an electric discharge to generate Ni and crystallized compounds of Ni and P only at the desired portion (T) of the surface thereof. The electric discharge in the step of structurally transforming the a-Ni--P alloy film layer is carried out by applying a discharge potential between at least one electric discharger (11) and a metallic table (12) as an electrode which carries the substrate (10) thereon, the electric discharger (11) being positioned in opposite to the surface of the substrate (10).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.