Magnetic recording medium

Details Magnetic recording medium Magnetic recording medium

1982-02-23

1985-01-29

Robinson, Ellis P.

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Physical dimension specified

360134, 360135, 360136, 427128, 427132, 428694, 428695, 428480, 428900, G11B 574, G11B 564, G11B 568

Patent

active

044966261

ABSTRACT:
A magnetic recording medium for high-density recording, which comprises a non-magnetic substrate and a magnetic layer provided on the non-magnetic substrate and containing, as main constituents, ferromagnetic grains and a binder, wherein the non-magnetic substrate surface on the side adjoining the magnetic layer has a surface roughness higher than that of the back surface of the non-magnetic substrate. The substrate surface adjoining the magnetic layer has a surface roughness of 0.007.mu. or more, while the back surface has a surface roughness of 0.02.mu. or less, but in each particular application the roughness of the surface adjoining the magnetic layer is selected to be higher than that of the back surface.

REFERENCES:
patent: 3967025 (1976-06-01), Tanube
patent: 4071654 (1978-01-01), Ogawa et al.
patent: 4153920 (1979-05-01), Shirahata
patent: 4202927 (1980-05-01), Yamaguchi
patent: 4348446 (1982-09-01), Mitsuishi
patent: 4461797 (1984-07-01), Adachi

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