Magnetic recording medium
US6203884A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 15, 1998 |
| Grant date | Mar 20, 2001 |
| Priority date | — |
| Expiry date | Dec 15, 2018 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31725
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The present invention provides a metal thin film type magnetic recording medium including a non-magnetic substrate made from a polyamide film whose surface configuration is controlled so as to obtain an optimal fine configuration of a magnetic layer surface, enabling to simultaneously obtain a preferable electro-magnetic conversion characteristic and preferable running characteristic. The non-magnetic substrate is made from an aromatic polyamide film formed in such a manner that fine protrusions having an average height of 5 to 50 nm are formed in a range of 10.sup.3 to 10.sup.5 thousand pieces/mm.sup.2 on a surface where a ferromagnetic metal thin film is to be formed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.