Magnetic recording medium

Details Magnetic recording medium Magnetic recording medium

1986-09-04

1987-12-15

Thibodeau, Paul J.

Stock material or miscellaneous articles

Structurally defined web or sheet

Continuous and nonuniform or irregular surface on layer or...

428694, 428900, G11B 570

Patent

active

047132787

ABSTRACT:
A magnetic recording medium comprises a light-shielding base in the form of a tape or sheet, and a magnetic layer composed of a magnetic powder of Co-coated .gamma.-Fe.sub.2 O.sub.3 dispersed in a resin binder and applied to the base. The powder has a specific surface area as determined by the BET adsorption method of at least 35 m.sup.2 /g. The light-shielding base portion contiguous to the magnetic layer is a transparent plastic film and the lower base portion is light-shielding. The light-shielding base has a light transmittance of 30% or below. The surface roughness of the base is, in terms of the center-line average surface roughness, 0.012 .mu.m or below.

REFERENCES:
patent: 4439486 (1984-03-01), Yamada et al.
patent: 4532178 (1985-07-01), Matsumoto
patent: 4562117 (1985-12-01), Kikukawa et al.
patent: 4592942 (1986-06-01), Nishimatsu et al.

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