Glass substrate for magnetic disks

Details Glass substrate for magnetic disks Glass substrate for magnetic disks

1997-08-29

1999-05-11

Watkins, III, William P.

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, C03C3/087

Patent

active

059026650

ABSTRACT:
A glass substrate for a magnetic disk of the present invention is one in which a laser beam is irradiated on a magnetic recording surface side thereby forming a large number of protrusions thereon to form texture thereon, each of the protrusions having a convex shape, an optical absorption coefficient of a glass with respect to a wavelength of a laser beam at 266 nm being within a range of 20 to 2000 mm.sup.-1, the glass having a composition by weight of:

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Hirohisa Ishihara et al., "Contact Start/Stop Characteristics on Photolithographic Magnetic Recording Media", Wear, vol. 172 (1994), pp. 65-72.

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