Method of manufacturing substrates for memory disks

Details Method of manufacturing substrates for memory disks Method of manufacturing substrates for memory disks

1992-01-30

1994-08-09

Larson, Lowell A.

Metal deforming

With 'coating' of work

Metal coating

723792, 72364, B21C 2322

Patent

active

053355261

ABSTRACT:
A method for manufacturing rigid disk substrates wherein the conventional process is modified to include a hot press function performed at the end of the fabrication process. The hot press function is performed so as to produce a flat substrate by causing the blank to yield, avoiding flow of either the blank or its overlay coating. The hot press temperature is coordinated with subsequent user process thermal cycle to avoid annealing by that cycle. The platens of the hot press are renewable with exact replacement replicas of master surfaces exhibiting a precise texture pattern ranging from an exact character down to a visibly featureless surface. That precise texture is embossed into the surface of the overlay without modifying that surface's epitaxy character. The process is extended beyond what is normal, by providing compliant platens having replica faces for removing asparity defects from post memory film deposition surfaces, restoring the substrate surface character to the finished disk.

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