Magnetic recording medium and recording/reproducing method there

Details Magnetic recording medium and recording/reproducing method there Magnetic recording medium and recording/reproducing method there

1987-03-04

1988-10-18

Thibodeau, Paul J.

Stock material or miscellaneous articles

Structurally defined web or sheet

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

427144, 427131, 428323, 428694, 428695, 428900, G11B 564

Patent

active

047787074

ABSTRACT:
A magnetic recording medium comprising a ferromagnetic metal thin film layer primarily based on cobalt and formed on the surface of a flexible substrate, an organic topcoat layer containing an anti-oxidant and a lubricant on the surface of the metal thin film layer, and a backcoat layer containing an inorganic pigment, an organic binder, and a lubricant on the other surface of the substrate is provided with protrusions on its surface at an average density of at least 10.sup.5 /a.sup.2 per square millimeter of the surface, the protrusions having a height of 30 to 300 .ANG., where a is the distance of a gap in a magnetic head with which the medium is used in recording/reproducing operation.

REFERENCES:
patent: 4419406 (1983-12-01), Isobe et al.
patent: 4452863 (1984-06-01), Takizawa et al.
patent: 4486500 (1985-12-01), Naruo et al.
patent: 4511635 (1985-04-01), Nagao et al.
patent: 4557948 (1985-12-01), Yamamoto et al.
patent: 4565734 (1986-01-01), Arai et al.
patent: 4568599 (1986-02-01), Ono et al.
patent: 4578729 (1986-03-01), Suzuki et al.
patent: 4645703 (1987-02-01), Suzuki et al.

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