Glass substrate for a magnetic disk with roughened edges

Details Glass substrate for a magnetic disk with roughened edges Glass substrate for a magnetic disk with roughened edges

1994-07-07

1996-10-29

Watkins, William

Stock material or miscellaneous articles

Structurally defined web or sheet

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

428410, 428338, 428220, 428 641, 428 642, 428 643, 428 644, 428 653, 428694SG, 428694TR, 369280, 360135, 346137, G11B 584

Patent

active

055695183

ABSTRACT:
A glass substrate for a magnetic disk having an inner peripheral edge and an outer peripheral edge, wherein the surface of at least the inner peripheral edge is treated by etching to have a surface roughness such that, as measured by a three dimensional scanning electron microscope at randomly selected at least four places with a reference length of 240 .mu.m and a cut-off wavelength of arithmetic mean roughness (Ra) of 80 .mu.m, the mean value of arithmetic mean roughness (Ra) is from 1.0 to 6.0 .mu.m, and the mean value of the number of peaks is within a range of from 8 to 30.

REFERENCES:
patent: 5080948 (1992-01-01), Morita et al.
patent: 5087481 (1992-02-01), Chen et al.
patent: 5094898 (1992-03-01), Morita et al.
patent: 5116658 (1992-05-01), Miyake
patent: 5128922 (1992-07-01), Inui et al.
patent: 5268071 (1993-07-01), Sono et al.

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