Stock material or miscellaneous articles – Structurally defined web or sheet – Continuous and nonuniform or irregular surface on layer or...
Patent
1991-07-08
1992-12-08
Thibodeau, Paul J.
Stock material or miscellaneous articles
Structurally defined web or sheet
Continuous and nonuniform or irregular surface on layer or...
428143, 428694, 428900, 427128, G11B 2300
Patent
active
051697033
ABSTRACT:
A magnetic recording medium having minute irregularities on the surface of a magnetic layer is disclosed. The value of the ratio A.sub.V /A.sub.P, where A.sub.V and A.sub.P are cross-sectional areas of valleys and projections as measured in a plane lower by 50 nm and in a plane higher than 50 nm than an intermediate plane of the magnetic layer, respectively, with the measurement being made using a three-dimensional roughness meter, is given by A.sub.V /A.sub.P .gtoreq.0.90, wherein the intermediate plane is a plane for which the cross-sectional area of the projections is approximately equal to that of the valleys. The minute irregularities on the surface of the magnetic layer are produced by providing a non-magnetic substrate presenting different surface roughnesses on its front surface and back surface, and by transferring surface irregularities constituting the surface roughness of the back surface of the non-magnetic substrate to the front surface of the substrate.
REFERENCES:
patent: 4713278 (1987-12-01), Yoda et al.
patent: 4746558 (1988-05-01), Shimozawa et al.
patent: 4946729 (1990-08-01), Nishimatsu et al.
patent: 4997696 (1991-03-01), Kamada et al.
Abe Tadahiro
Miyazaki Takahiro
Ogawa Tsutomu
Yamaga Minoru
Kiliman Leszek
Sony Corporation
Thibodeau Paul J.
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