Magnetic recording medium and recording/reproducing method therefor
US4778707A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 4, 1987 |
| Grant date | Oct 18, 1988 |
| Priority date | — |
| Expiry date | Mar 4, 2007 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/25
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A magnetic recording medium comprising a ferromagnetic metal thin film layer primarily based on cobalt and formed on the surface of a flexible substrate, an organic topcoat layer containing an anti-oxidant and a lubricant on the surface of the metal thin film layer, and a backcoat layer containing an inorganic pigment, an organic binder, and a lubricant on the other surface of the substrate is provided with protrusions on its surface at an average density of at least 10.sup.5 /a.sup.2 per square millimeter of the surface, the protrusions having a height of 30 to 300 .ANG., where a is the distance of a gap in a magnetic head with which the medium is used in recording/reproducing operation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.