Substrate for a magnetic disc and method manufacturing same

Details Substrate for a magnetic disc and method manufacturing same Substrate for a magnetic disc and method manufacturing same

1984-08-08

1987-12-29

Robinson, Ellis P.

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Physical dimension specified

360135, 427128, 427129, 2041922, 428323, 428408, 428694, 428695, 428900, 523468, 523512, 524495, 524496, G11B 704

Patent

active

047160780

ABSTRACT:
A substrate for magnetic discs, which are to be used as external storage in data processors, is formed from glass-like carbon materials by themselves or contained in a thermosetting resin matrix. The glass-like carbon materials have excellent thermal resistance, can be finished to a mirror-like surface, and have less surface defects than aluminum substrates. Magnetic materials can be adhered directly onto the surface of such substrates shaped in the form of a disc. The resulting disc has good hardness, is resistant to elevated temperatures, is less likely to deform, and is low in cost.

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patent: 4398659 (1983-08-01), Richter
patent: 4415942 (1983-11-01), Frosch
patent: 4490201 (1984-12-01), Leeds
patent: 4598017 (1986-07-01), Bayer

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