Glass substrate for magnetic disks

Details Glass substrate for magnetic disks Glass substrate for magnetic disks

1997-11-13

2000-10-17

Robinson, Ellis

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, 428694ST, 501 68, 501 69, 501 70, 369280, 360135, 346137, C02C 3087, G11B 584, G11B 574, G11B 582

Patent

active

06132843&

ABSTRACT:
A glass substrate for a magnetic disk of the present invention is one in which a laser beam is irradiated on a main surface thereby forming a large number of protrusions thereon to form texture thereon, each of said protrusions being formed by a protruded portion having a convex shape, said glass having a composition in which 0.2 to 3 wt % of an oxide of a transition metal is contained and an absorption coefficient with respect to a wavelength of a light at 266 nm being within a range of 0.03 to 2 .mu.m.sup.-1, and by setting the absorption coefficient of the glass with respect to a wavelength of a light at 266 nm within a range of 0.03 to 2 .mu.m.sup.-1 and irradiating a laser beam having a wavelength in a range of ultraviolet rays selectively on the main surface of a glass substrate at predetermined intervals, texture comprising a large number of protrusions formed by protruded portions each having a small diameter and a convex shape is formed.

REFERENCES:
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patent: 5087481 (1992-02-01), Chen et al.
patent: 5108781 (1992-04-01), Ranjan et al.
patent: 5273834 (1993-12-01), Hoover et al.
patent: 5586040 (1996-12-01), Baumgart et al.
patent: 5681636 (1997-10-01), Marshall
patent: 5691256 (1997-11-01), Taguchi et al.
patent: 5846628 (1998-12-01), Kuroe et al.
patent: 5902665 (1999-05-01), Kuroda
"Contact Start/Stop Characteristics on Photolithographic Magnetic Recording Media", H. Ishihara et al., "Wear", vol. 172, 1994, p. 65 (Abstract and Introduction only).

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