Magnetic recording medium and production method thereof
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United States of America Patent
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Apr 17, 2012
Grant Date -
Oct 16, 2008
app pub date -
Jun 30, 2005
filing date -
Jun 30, 2004
priority date (Note) -
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status (Latency Note)
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Abstract
The magnetic recording medium of the present invention has a pattern formed using a pattern-forming agent in a laminate of multiple layers including a base material and a magnetic recoding layer, wherein the pattern is recognized on the surface of the laminate opposite to the base material, and the pattern-forming agent is distributed through the thickness of the laminate, wherein a region between the center of the magnetic recording layer and a magnetic recording-reading side of the laminate has an area having a density gradient of the pattern-forming agent which gradually declines in the direction from the center of the magnetic recording layer to the magnetic recording-reading side.
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