Method of manufacturing substrate for magnetic recording medium

Abstract

A method of manufacturing a substrate for a magnetic recording medium that is capable of manufacturing a magnetic recording medium substrate having no warping and superior surface smoothness at a high level of productivity and at low cost. The method of manufacturing a substrate for a magnetic recording medium according to the present invention includes a thin glass sheet formation step of heating and softening a sheet-like glass base material (1), and heat-stretching the glass base material (1) while pulling the material downward through space, thereby forming a thin glass sheet (5), a glass substrate formation step of cutting a circular disc-shaped glass substrate from the thin glass sheet (5), and a surface processing step of subjecting the disc-shaped glass substrate to lapping and/or polishing surface processing.

Dependencies are inferred from the claim text.