Method for making a magnetic disk
US5160761A · kind A · utility
24Cited by
1References
3Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 24, 1992 |
| Grant date | Nov 3, 1992 |
| Priority date | — |
| Expiry date | Mar 24, 2012 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S428/90
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Information is magnetically recorded in and reproduced from a magnetic disk using a flying magnetic head. The disk is a coating type disk comprising a rigid substrate having a magnetic layer coated thereont from a magnetic coating composition of ferromagnetic submicron particles in a binder. High density recording is possible when the substrate has a surface roughness Ra of up to 0.007 .mu.m, the magnetic layer has a thickness of up to 0.5 .mu.m, a surface roughness Ra of up to 0.005 .mu.m, and a porosity of 4 to 45%.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.