Magnetic recording medium

Stock material or miscellaneous articles – Circular sheet or circular blank – Recording medium or carrier

Patent

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Details

428336, 428694B, 428694BS, 428694BN, 428694BA, 428694BH, 428694BM, 428900, B32B 302, B32B 516, G11B 566

Patent

active

054966078

ABSTRACT:
Disclosed is a magnetic recording medium comprising at least two layers comprising at least one lower non-magnetic layer containing at least a non-magnetic particle and a binder on a non-magnetic support, and at least one upper magnetic layer containing at least a ferromagnetic particle and a binder on the lower non-magnetic layer, wherein a mean total thickness d of the upper magnetic layer is more than 0.01 .mu.m to less than 0.3 .mu.m, and a standard deviation .sigma. of the total thickness of the upper magnetic layer and the mean total thickness d of the upper magnetic layer satisfy the relationship of 0.05.ltoreq..sigma./d.ltoreq.0.5.

REFERENCES:
patent: 4367263 (1983-01-01), Kawahara
patent: 4649073 (1987-03-01), Suzuki
patent: 4741953 (1988-05-01), Katsuta
patent: 4794042 (1988-12-01), Kubota
patent: 4847147 (1989-07-01), Aonuma
patent: 4857388 (1989-08-01), Ogawa
patent: 4863793 (1989-09-01), Ogawa
patent: 4865924 (1989-09-01), Saito et al.
patent: 4963433 (1990-10-01), Ogawa et al.

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