Magnetic recording medium including disk substrate, magnetic layer, and non-magnetic layer
US7438982B2 · kind B2 · utility
4Cited by
8References
17Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 24, 2005 |
| Grant date | Oct 21, 2008 |
| Priority date | — |
| Expiry date | Jul 14, 2026 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/2457
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A magnetic recording medium includes at least a disk substrate, a magnetic recording layer formed with a predetermined concavo-convex pattern on the disk substrate, and a non-magnetic layer formed in concave portions of the concavo-convex pattern. Convex shapes made of a non-magnetic material are formed on the magnetic recording layer or the non-magnetic layer. Each convex shape is formed, for example, into a mountain-like shape whose upper surface width is made smaller than a width of each convex portion of the magnetic recording layer or a width of each concave portion where the non-magnetic layer 6 is formed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.