Stock material or miscellaneous articles – Circular sheet or circular blank – Recording medium or carrier
Patent
1996-04-02
1998-12-08
Resan, Stevan A.
Stock material or miscellaneous articles
Circular sheet or circular blank
Recording medium or carrier
428141, 428426, 428694SG, 428694TR, 428900, 216 97, G11B 582
Patent
active
058466282
ABSTRACT:
Disclosed herein is a substrate for a magnetic disc comprising a glass substrate having fine protrusions on its surface, the protrusions having a height of 50 to 1000 .ANG., a width of 0.01 to 1 .mu.m, a density of 10 to 1000 per 100 .mu.m.sup.2 and an area ratio of 0.1 to 50%, and a ratio of peak height on a mean line (R.sub.p) to maximum height (R.sub.max) with respect to surface roughness of the substrate being at least 60%. Further, a process for preparing the substrate and a magnetic disc having the substrate are disclosed.
Because the substrate according to the present invention has appropriate protrusions on its surface, a friction force and an adsorbing force between a head and a magnetic disc can be reduced, leading to the improvement of the CSS and the anti-head stick properties. In addition, the S/N ratio is not affected because the fine concave portions formed on the surface of the substrate are shallow.
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Kuroe Toru
Mouri Daisuke
Yokoyama Fumiaki
Buckley Linda M.
Conlin David G.
Mitsubishi Kasei Corporation
Resan Stevan A.
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