Glass substrate for a magnetic disc and process for its producti

Details Glass substrate for a magnetic disc and process for its producti Glass substrate for a magnetic disc and process for its producti

1987-10-08

1989-05-23

Thibodeau, Paul J.

Stock material or miscellaneous articles

Structurally defined web or sheet

Continuous and nonuniform or irregular surface on layer or...

65 31, 156646, 156663, 427129, 428426, 428694, 428900, B32B 300

Patent

active

048330019

ABSTRACT:
A glass substrate for a magnetic disc having a finely and isotropically roughened surface, wherein the maximum height R.sub.max of the surface roughness is substantially not higher than 700 .ANG. at a standard length of 250 .mu.m and substantially not less than 50 .ANG. at a standard length of 50 .mu.m.

REFERENCES:
patent: 3466156 (1969-09-01), Peters et al.
patent: 3516860 (1970-06-01), Simmons
patent: 4326229 (1982-04-01), Yanagisawa
patent: 4411963 (1983-10-01), Aine
patent: 4415404 (1983-11-01), Riegl
patent: 4608293 (1986-08-01), Wada et al.
patent: 4645703 (1987-02-01), Suzuki et al.
patent: 4716078 (1987-12-01), Kishine et al.

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