Stock material or miscellaneous articles – Circular sheet or circular blank – Recording medium or carrier
Patent
1986-01-17
1987-10-06
Thibodeau, Paul J.
Stock material or miscellaneous articles
Circular sheet or circular blank
Recording medium or carrier
360135, 427129, 427131, 427132, 427250, 427292, 428156, 428694, 428900, G11B 564, G11B 582
Patent
active
046982515
ABSTRACT:
A magnetic disk or like magnetic recording medium having a magnetic layer provided on a non-magnetic substrate by dry-process or wet-process plating means and allowing a head to write and read data thereinto and thereoutof, and a method or producing such a recording medium. Scratch marks are formed on the surface of a non-magnetic thin layer, which is provided on the substrate, at a predetermined pitch and a predetermined depth in a particular direction which is substantially aligned with a direction in which the head writes data. A magnetic layer is deposited on the scratched surface of the non-magnetic layer. The pitch is less than about 50 microns, preferably about 0.1 to 10 microns, while the depth is about 0.002 to 0.1 microns in terms of center line mean roughness.
REFERENCES:
patent: 4046932 (1977-09-01), Hartmann et al.
patent: 4307156 (1981-12-01), Yanagisawa et al.
patent: 4380558 (1983-04-01), Yanagisawa et al.
patent: 4430387 (1984-02-01), Nagakawa et al.
patent: 4608293 (1986-08-01), Wada et al.
Fukuda Yasutaka
Nakano Atsushi
Shimizu Shigeo
Thibodeau Paul J.
Victor Company of Japan , Limited
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