Magnetic recording medium

Details Magnetic recording medium Magnetic recording medium

1991-01-11

1992-02-04

Thibodeau, Paul J.

Stock material or miscellaneous articles

Structurally defined web or sheet

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

428323, 428329, 428331, 428480, 428694, 428900, G11B 2300

Patent

active

050859153

ABSTRACT:
A magnetic recording medium which comprises plurality of magnetic layers comprising at least first and second magnetic layers which are successively formed on a surface of a polyethylene terephthalate support, wherein said support contains inert inorganic particles having an average particle size of from 0.5 to 0.7 microns, a standard deviation of 0.1 microns or less and the surface of said support has a center line average roughness (Ra) of 16 nm or less and a density of protrusions (Ds) of 6000/mm.sup.2 or more in the case of protrusions of 0.7 microns of more.

REFERENCES:
patent: 4670319 (1987-06-01), Katoh et al.
patent: 4732799 (1988-03-01), Sakamoto et al.
patent: 4778708 (1988-10-01), Nishino et al.
patent: 4784895 (1988-11-01), Mizuno et al.
patent: 4840830 (1989-06-01), Sakamoto et al.
patent: 4865924 (1989-09-01), Saito et al.

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