Patent ID: 6383404
Filing Date: 2002-05-07
Classification: B82Y,C03C,G11B,Y10T

Abstract:
A method of manufacturing a glass substrate which is for use in a magnetic recording medium, comprising the steps of:preparing a glass member in which Ra falls within the range between 0.1 and 1.0 nm when a surface roughness of a principal surface of said glass member is measured by the use of the interatomic force microscope (AFM), and chemically processing the surface so that Ra falls within the range between 0.2 and 2.5 nm, Rmax falls within the range between 3 and 25 nm, and Rmax/Ra falls within the range between 3 and 35, said glass member having surface roughness Ra and Rmax, where Ra is representative of a center-line mean roughness, Rmax is defined as a maximum height representative of a difference between a highest point and a lowest point.