Thin film-type magnetic disk

Details Thin film-type magnetic disk Thin film-type magnetic disk

1990-02-05

1992-01-21

Thibodeau, Paul J.

Stock material or miscellaneous articles

Circular sheet or circular blank

Recording medium or carrier

428141, 428611, 428694, 428695, 428500, 428928, G11B 2300

Patent

active

050827090

ABSTRACT:
A thin film-type magnetic disk includes a non-magnetic substrate having fine particle-like projections provided over at least the entirety of the recording areas of the magnetic disk. The fine particle-like projections are formed either on bulged portions of the substrate or are provided in the form of bands. The bulged portions and the bands extend substantially parallel to a direction of movement of a magnetic head relative to the magnetic disk. A magnetic layer, a protective layer and a lubricant layer are sequentially formed on the substrate.

REFERENCES:
patent: 4326229 (1982-04-01), Yanagisawa
patent: 4698251 (1987-10-01), Fukuda et al.
patent: 4725470 (1988-02-01), Katsuki
patent: 4735840 (1988-04-01), Hedgcoth
patent: 4804590 (1989-02-01), Nakamura et al.
patent: 4828899 (1989-05-01), Arioka et al.
patent: 4873138 (1989-10-01), Okita
patent: 4939614 (1990-07-01), Shirakura et al.
patent: 4973496 (1990-11-01), Kruger et al.

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