Annodized aluminum substrate for a magnetic recording disk in wh

Details Annodized aluminum substrate for a magnetic recording disk in wh Annodized aluminum substrate for a magnetic recording disk in wh

1988-07-13

1991-09-10

Cashion, Jr., Merrell C.

Stock material or miscellaneous articles

Circular sheet or circular blank

Recording medium or carrier

428694, 428695, 428900, 360135, 427128, G11B 2300

Patent

active

050472747

ABSTRACT:
A substrate for a magnetic recording disk, made of anodized aluminum having its pores packed with a non magnetic material and having been subjected to polishing followed by an etching treatment to form a finely roughened surface due to preferential etching of either the aluminum or the non magnetic material.

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patent: 4689260 (1987-08-01), Briska et al.
patent: 4698251 (1987-10-01), Fukuda et al.
patent: 4761330 (1988-08-01), Tokushima et a.
Patent Abstracts of Japan, [2721], vol. 11, No. 274 (P-612), Sept. 5, 1987; & JP-A.sup.3 62 073 425 (Pilot Precision Co. Ltd.).

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