Perpendicular magnetic recording medium

Details Perpendicular magnetic recording medium Perpendicular magnetic recording medium

1986-12-23

1988-08-09

Thibodeau, Paul J.

Stock material or miscellaneous articles

Structurally defined web or sheet

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

427131, 428694, 428900, G11B 564

Patent

active

047627425

ABSTRACT:
A perpendicular magnetic recording medium comprises a base having a main surface and form, and a magnetic layer formed on the main surface, and having a recording surface, formed with a number of fine projections, and a susceptible axis substantially perpendicular to the recording surface. The projections are distributed so that the difference between a height level corresponding to an area ratio of 1.0%, obtained when the projections are cut by an imaginary plane parallel to the recording surface, and another height level corresponding to an area ratio of 99.0%, obtained in a like manner, ranges from 40 to 600 .ANG.. A protective film of a substantially uniform thickness is formed on the recording surface of the magnetic layer.

REFERENCES:
patent: 4567083 (1986-01-01), Arioka et al.
patent: 4645703 (1987-02-01), Suzuki et al.

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