Perpendicular magnetic recording floppy disk
US4801481A · kind A · utility
4Cited by
3References
3Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 17, 1983 |
| Grant date | Jan 31, 1989 |
| Priority date | — |
| Expiry date | Jun 17, 2003 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31786
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A perpendicular magnetic recording floppy disk comprises a flexible plastic film substrate, a first magnetic recording layer formed on one side of the plastic film substrate and having an axis of easy magnetization in a direction perpendicular to the one side of the plastic film substrate, and a second magnetic recording layer formed on the other side of the plastic film substrate and having an axis of easy magnetization in a direction perpendicular to the above-mentioned other side of the plastic film substrate. The second magnetic recording layer has a thickness greater than a thickness of the first magnetic recording layer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.