Magnetic recording medium with controlled surface characteristics
US10580447B2 · kind B2 · utility
2Cited by
6References
21Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 12, 2016 |
| Grant date | Mar 3, 2020 |
| Priority date | — |
| Expiry date | Oct 29, 2036 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/73935
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A magnetic recording medium has a recording surface having an average surface roughness SRa of 3.0 nm or less, the number of projections having a height of 7.5 nm or more included in a unit region (where the unit region is a square region with each side having a length of 30 μm) of the recording surface is 256 or more, and the number of projections having a height of 15 nm or more included in the unit region of the recording surface is 0 or more and 104 or less.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.