Recording medium that can be magnetized vertically and method fo

Details Recording medium that can be magnetized vertically and method fo Recording medium that can be magnetized vertically and method fo

1987-11-12

1989-03-28

Robinson, Ellis P.

Stock material or miscellaneous articles

Circular sheet or circular blank

Recording medium or carrier

1563066, 156330, 427128, 427129, 427130, 427131, 427132, 428 65, 428215, 428216, 428141, 428415, 428426, 428694, 428900, G11B 570

Patent

active

048163112

ABSTRACT:
A recording medium which can be magnetized vertically contains a plate-shaped carrier body of nonmagnetic material of which at least one flat side is provided with a thin nonmagnetic intermediate layer having a very smooth surface, to which at least one magnetic recording layer of a material is applied, the axis of easy magnetization of which points in a direction perpendicular to the surface of the medium. The surface of this intermediate layer should be capable of being made smooth in a relatively simple manner. The intermediate layer comprises a glass plate, preferably of fused silica or silicate glass, which is cemented to the carrier body. For the carrier body, particularly a high-strength hardened Al-alloy can be used.

REFERENCES:
patent: 4254189 (1981-03-01), Fisher
patent: 4287544 (1981-09-01), Lazzari
patent: 4411963 (1983-10-01), Aine
patent: 4659606 (1987-04-01), Wada
patent: 4690846 (1987-09-01), Wada
IEEE Transactions on Magnetics, vol. MAG-16, No. 1, Jan. 1980, pp. 71 to 76.
DIN 4762, May 1978, pp. 1-15.
J. M. Brownlow et al., "Magnetic Film Substrate", IBM Tech. Disclosure Bull., vol. 7, No. 3, Aug. 1964.

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