Magnetic recording medium
US11189314B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 22, 2021 |
| Grant date | Nov 30, 2021 |
| Priority date | — |
| Expiry date | Jan 22, 2041 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/78
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A magnetic recording medium is provided and includesa substrate;a magnetic layer;an underlayer between the substrate and the magnetic layer; anda back layer, wherein (wmax−wmin)/wmin≤400 [ppm] (1) where wmax and wmin are respectively maximum and minimum of average values of width corresponding to samples of magnetic recording medium measured after the samples are stored for two hours under storage conditions (a loading tension in the longitudinal direction of the magnetic recording medium, a temperature and a relative humidity) for each of the samples, and a width of a sample of the magnetic recording medium at 25° C. and 50% relative humidity and without loading is ½ inch.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.