Magnetic recording medium having a thin film magnetic layer formed over a non-magnetic substrate which has powder grains of the substrate disposed on its surface
US5079062A · kind A · utility
6Cited by
5References
23Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 30, 1989 |
| Grant date | Jan 7, 1992 |
| Priority date | — |
| Expiry date | Jun 30, 2009 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/2982
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In a magnetic recording medium in which a thin film of a magnetic material is disposed on a surface of a base of a non-magnetic material directly or through an undercoated film, powder of a material substantially the same as that of the non-magnetic base or an undercoated film is disposed directly beneath the magnetic thin film to form dispersed projections on the surface of the magnetic recording medium. Thus, the product has surface projections, and its magnetic thin film has a generally uniform thickness and uniform magnetic properties.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.