Magnetic recording medium and method of manufacturing the same
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United States of America Patent
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Sep 17, 2013
Grant Date -
Mar 3, 2011
app pub date -
Aug 26, 2010
filing date -
Aug 27, 2009
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Abstract
An aspect of the present invention relates to a magnetic recording medium comprising a nonmagnetic layer containing a nonmagnetic powder and a binder and a magnetic layer containing a ferromagnetic powder and a binder in this order on a nonmagnetic support, wherein
- the magnetic layer comprises a nonmagnetic powder of which coefficient of variation CV of a particle size distribution as denoted by the following formula (1):CV(%)=σ/φ×100 (1)is less than 20 percent, andthe magnetic layer has a thickness being equal to or less than 0.1 μm and falling within a range of 1.1≦φ/t≦8.0, wherein σ denotes a standard deviation of a particle diameter, φ denotes an average particle diameter of the nonmagnetic powder comprised in the magnetic layer being expressed in μm, and t denotes a thickness of the magnetic layer being expressed in μm.
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