Magnetic recording medium

Details Magnetic recording medium Magnetic recording medium

1990-07-31

1991-03-05

Thibodeau, Paul J.

Stock material or miscellaneous articles

Structurally defined web or sheet

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

428329, 428694, 428900, G11B 2300

Patent

active

049976966

ABSTRACT:
A magnetic recording medium comprising a non-magnetic support having thereon a magnetic layer composed of ferromagnetic iron oxide powder dispersed in a binder, wherein a value of P.sub.10 of optical interference type three dimensional surface roughness on the magnetic layer side of the non-magnetic support is in the range of 15 to 35 nm, Rmax/P.sub.10 is not higher than 2.8 and P.sub.10 of the opposite side to the magnetic layer side is also in the range of 15 to 35 nm, wherein P.sub.10 (nm) represents the difference between an average height of the protrusions of 10 apices extracted in order of greatest height within an area 250 .mu.m square and an average height of all apices within the same 250 .mu.m square area and Rmax (nm) represents the difference between an uppermost height and a lowermost depth within the 250 .mu.m square area.

REFERENCES:
patent: 4680217 (1987-07-01), Kanesaki et al.
patent: 4720412 (1988-01-01), Katoh et al.

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