Magnetic recording medium and method for production thereof
US5571595A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 26, 1993 |
| Grant date | Nov 5, 1996 |
| Priority date | — |
| Expiry date | Nov 26, 2013 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31786
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A magnetic recording medium having a magnetic metal thin film as a magnetic layer is disclosed. An oxide layer is formed on the surface of the magnetic metal thin film, and a proactive layer is further formed on the oxide layer. The oxide layer on the surface of the magnetic metal thin film has a thickness of 20 to 230 .ANG., while the protective layer has a thickness of 20 to 230 .ANG.. The combined total thickness of the oxide layer and the protective layer is 40 to 250 .ANG.. The oxide layer surface may be bombarded prior to formation of the protective layer for improving the bonding of the protective layer. A lubricant may be coated on the surface of the protective layer. The lubricant may be one of perfluoro alkyl ester of carboxylic acid, ester compounds of perfluoro polyether having carboxylic groups, and amine salt compounds. The reverse surface of a non-magnetic base film as a substrate has a centerline mean roughness R.sub.a and the maximum height R.sub.max of projections in the ranges of 0.015 .mu.m.ltoreq.R.sub.a 0.0070 .mu.m and 0.015.ltoreq.R.sub.max .ltoreq.0.070 .mu.m, respectively.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.