Magnetic recording medium having a controlled dimensional variation
US11017809B2 · kind B2 · utility
8Cited by
2References
29Claims
0Family size
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Key dates
| Filing date | Jun 27, 2019 |
| Grant date | May 25, 2021 |
| Priority date | — |
| Expiry date | Sep 24, 2039 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/7379
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A magnetic recording medium includes a layer structure including a magnetic layer, a base layer, and a back layer in this order, in which an average thickness tT is tT≤5.5 μm, a dimensional variation Δw in a width direction to tension change in a longitudinal direction is 660 ppm/N≤Δw, and a surface roughness Rabe of the base layer on a side of the back layer is 4.2 nm≤Rabe≤8.5 nm.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.