Magnetic recording medium utilizing specified non-magnetic particles in the magnetic layer
US7175927B2 · kind B2 · utility
1Cited by
5References
4Claims
0Family size
Assignee
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Key dates
| Filing date | Nov 9, 2004 |
| Grant date | Feb 13, 2007 |
| Priority date | — |
| Expiry date | Nov 9, 2024 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/257
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A magnetic recording medium having a non-magnetic support and a magnetic layer formed thereon, wherein the magnetic layer comprises a ferromagnetic powder, a binder and a non-magnetic inorganic powder, and wherein at least 95% of the non-magnetic powder particles contained in the magnetic layer have a particle size of 0.05 to 0.013 μm, provide that the non-magnetic powder particles are those found in a field of view of 1.8 μm×2.4 μm when the surface of the magnetic layer is observed with a scanning electron microscope at a magnification of 50,000 times.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.