METHOD FOR MANUFACTURING GLASS SUBSTRATE FOR MAGNETIC DISC AND METHOD FOR MANUFACTURING MAGNETIC DISC

摘要

METHOD FOR MANUFACTURING GLASS SUBSTRATE FOR MAGNETIC DISC AND METHOD FOR MANUFACTURING MAGNETIC DISCThe invention relates to a manufacturing method of a glass substrate for processing a mirror-smooth plate glass (3) having a mirror-smooth principal surface, to a desired flatness and surface roughness by using a diamond sheet (10) of fixed abrasive grains. As pretreatment, the surface of the mirror-smooth plate glass (3) is roughened by a mechanical method or a chemical method until the polishing action of the diamond sheet (10) is sufficiently applicable. Then, by using the diamond sheet (10), the surface of the mirror-smooth plate glass (3) is processed to a desired plate thickness and flatness.Selected Drawings Fig. 2