Glass substrate having surface protrusions for use as a magnetic

Details Glass substrate having surface protrusions for use as a magnetic Glass substrate having surface protrusions for use as a magnetic

1995-05-23

1997-04-08

Breneman, R. Bruce

Etching a substrate: processes

Nongaseous phase etching of substrate

Etching inorganic substrate

216 22, 252 793, C03C 1500, C09K 1308

Patent

active

056184484

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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patent: 5087481 (1992-02-01), Chen et al.
patent: 5091225 (1992-02-01), Goto
patent: 5131977 (1992-07-01), Morizane et al.

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