Substrate for magnetic disk memory and production process

Details Substrate for magnetic disk memory and production process Substrate for magnetic disk memory and production process

1988-02-03

1990-03-27

Thibodeau, Paul J.

Stock material or miscellaneous articles

Circular sheet or circular blank

Recording medium or carrier

360135, 428167, 428457, 428694, 428900, G11B 564

Patent

active

049119672

ABSTRACT:
Substrate for magnetic disk memory and production process.
The substrate comprises an aluminium wafer (10) and two plastic sheets (39,41) pressed hot against the wafer. The outer faces (38,40) have a good flatness or smoothness, as a result of the surface state of the pressing plates.
Application to the production of substrates used in the manufacture of disks for magnetic recording purposes.

REFERENCES:
patent: 3290692 (1966-12-01), Jacoby
patent: 4673602 (1987-06-01), Nakayama et al.
patent: 4698251 (1987-10-01), Fukuda et al.

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