Metal substrate for a magnetic disc and manufacture thereof
US5593602A · kind A · utility
3Cited by
13References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 1, 1994 |
| Grant date | Jan 14, 1997 |
| Priority date | — |
| Expiry date | Mar 1, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/8404
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The present invention provides a process for producing a metal substrate for a thin film magnetic data storage disc, the process including the steps of: (a) providing a metal substrate; (b) printing a masking pattern onto at least a portion of the surface of the substrate; and (c) etching the unmasked surface of the substrate thereby to texture the substrate surface. The present invention also provides a metal substrate for a thin film magnetic data storage disc, the substrate having a roughened surface produced by preferential area etching, the roughened surface being composed of a regular pattern of peaks separated by valleys.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.