Birch, Stewart, Kolasch & Birch, LLP
Magnetic recording medium comprising a magnetic layer having specific surface roughness and protrusions
A magnetic recording medium comprising a non-magnetic support, at least one primer layer formed on one surface of the non-magnetic support, a magnetic layer formed on the primer layer, and a backcoat layer formed on the other surface of the non-magnetic support, wherein the magnetic layer has a thickness of 0.30 &mgr;m or less and a centerline average surface roughness Ra of 3.2 nm or less, and (P1&#8722;P0) is 30 nm or less and (P1&#8722;P20) is 5 nm or less in which P0 is an averaged height of projections of the magnetic layer, and P1, P2, - - - and P20 are heights of the highest, the second highest, - - - and the 20th highest projections of the magnetic layer, respectively.
Hitachi Maxell, Ltd.
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Kenichiro Norihisa Masakazu Yoshiyuki
Yoshida Yoshimoto Tani Makita