Magnetic recording medium
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United States of America Patent
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-
Feb 23, 1993
Issued Date -
N/A
app pub date -
Jul 24, 1991
filing date -
Jan 3, 1991
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A magnetic recording medium is disclosed which is excellent in video and audio signal output as well as in S/N ratio. The recording medium comprises first and second magnetic layers provided on a support in this order from said support and the first magnetic layer has a SFD value of from 0.38 to 0.60 and the second magnetic layer has a SFD value of from 0.30 to 0.45, wherein SFD is defined as follows: SFD=.DELTA.H/Hc where .DELTA.H is a half-width of magnetic field at the extreme value of differential coefficient of a magnetic induction-magnetic field hysterisis curve, and Hc is a coercive force of a magnetic material.
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