MAGNETIC DISK SUBSTRATE, MAGNETIC DISK, AND PROCESS FOR PRODUCING MAGNETIC DISK SUBSTRATE

Title:

MAGNETIC DISK SUBSTRATE, MAGNETIC DISK, AND PROCESS FOR PRODUCING MAGNETIC DISK SUBSTRATE

Document Type and Number:

WIPO Patent Application WO/1997/001164

Kind Code:

A1

Abstract:

A magnetic disk substrate having the body made from glass, characterized by containing light-absorbing metal elements in at least the surface region of the substrate body and having a texture formed on the surface of the body. The metal elements are diffused in the surface region as metal ions or contained in the glass ingredients as metal oxides. Preferable examples of the glass include crystallized LiO2-Al2O3-SiO2 glasses, more particularly those composed of 65-85 wt.% SiO2, 8-15 wt.% Li2O, 2-8 wt.% Al2O3, 1-5 wt.% P2O5, and 1-10 wt.% ZrO2, and containing lithium disilicate (LiO2.2SiO2) as the principal crystal phase.

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Inventors:

SUZUKI TOMIO (JP)
TAKEYA FUMINORI (JP)
ABE MASAHIRO (JP)

Application Number:

PCT/JP1996/001732

Publication Date:

January 09, 1997

Filing Date:

June 21, 1996

Export Citation:

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Assignee:

NGK INSULATORS LTD (JP)
SUZUKI TOMIO (JP)
TAKEYA FUMINORI (JP)
ABE MASAHIRO (JP)

International Classes:

C03C10/00; C03C21/00; G11B5/64; G11B5/73; G11B5/84; (IPC1-7): G11B5/66; C03C23/00; G11B5/84

Foreign References:

JPH07157331A	1995-06-20
JPH07182655A	1995-07-21
JPS63152022A	1988-06-24
JPH02187922A	1990-07-24

Other References: