Patent ID: 6132843
Filing Date: 2000-10-17
Classification: B23K,C03C,G11B,Y10T

Abstract:
A glass substrate for a magnetic disk 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, said glass substrate being an aluminosilicate glass formed from a floating glass method, wherein the oxide of a transition metal is at least one oxide selected from the group consisting of titanium oxide, vanadium oxide, chromium oxide, manganese oxide, iron oxide, cobalt oxide, nickel oxide, copper oxide, molybdenum oxide, tungsten oxide and cerium oxide.