Base plate for magnetic recording disc

Details Base plate for magnetic recording disc Base plate for magnetic recording disc

1980-11-12

1984-02-07

Dixon, Jr., William R.

Stock material or miscellaneous articles

All metal or with adjacent metals

Intermediate article

204 38A, 204 42, 427131, 360135, 428 64, 428 65, 428216, 428409, 428411, 428412, 4284258, 428469, 428629, 428636, 428654, 428651, 428653, 428656, 428660, B21C 100

Patent

active

044303874

ABSTRACT:
A base plate for magnetic recording disc is produced by coating thin metal layers containing no impurities for forming defects by an anodizing treatment on one or both sides of a discoid substrate made of a metal such as aluminum or an aluminum alloy or from a plastic by a dry process, and anodizing the thin metal layers so as to form anodized film from the surfaces of the thin metal layers to a certain depth while the portions contacting to the substrate are retained not anodized.

REFERENCES:
patent: 3808109 (1974-04-01), Schaurer
patent: 3886052 (1975-05-01), Smith
patent: 4069360 (1978-01-01), Yanigasuma et al.
patent: 4077051 (1978-02-01), Vossen, Jr.
patent: 4097650 (1978-06-01), Shirahata et al.
patent: 4152487 (1979-05-01), Yanagisawa
patent: 4254189 (1981-03-01), Fisher
patent: 4356066 (1982-10-01), Kienle et al.
patent: 4357366 (1982-11-01), Takaoka et al.
patent: 4364995 (1982-12-01), Crawford et al.
Mohr et al., Insulating Aluminum Oxide Films, IBM Technical Disclosure Bulletin, vol. 6, No. 3, 8/1963, p. 9.

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