Process for producing magnetic recording medium
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United States of America Patent
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-
Dec 10, 1996
Grant Date -
N/A
app pub date -
Mar 25, 1996
filing date -
Mar 24, 1995
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A magnetic recording medium having an improved CSS characteristics is made by a process including a surface texture treatment step of either (1) focusing an ultraviolet laser beam in a ring-shaped band, or (2) focusing a pulsed ultraviolet laser beam at an energy density of at least 0.01 J/cm.sup.2 but lower than the threshold level successively at least two times but up to 1,000 times, on a substrate composed of glass or silicon, followed by the formation of an undercoat, a magnetic layer, and a protective coating in this order on the surface-textured substrate.
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