Magnetic recording medium
US5094904A · kind A · utility
4Cited by
4References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 22, 1991 |
| Grant date | Mar 10, 1992 |
| Priority date | — |
| Expiry date | Mar 22, 2011 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/265
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Disclosed is a magnetic recording medium comprising a non-magnetic support, and a first magnetic layer, a second magnetic layer and a third magnetic layer laminated on a non-magnetic support surface in this order, a total layer thickness of the second magnetic layer and the third magnetic layer of 0.7 .mu.m or less, and a coercive force of a ferromagnetic powder contained in the third magnetic layer being 1.2 to 2.5 times as strong as a coercive force of a ferromagnetic powder contained in the first magnetic layer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.