| 摘要 |
PROBLEM TO BE SOLVED: To manufacture a glass substrate for a magnetic disk having a uniform shape.SOLUTION: The present invention is a method for manufacturing a glass substrate for a magnetic disk, the method having a polishing process for polishing, by using a first polishing liquid, a side wall surface perpendicular to the principal surface of the glass substrate and an interposing surface for connecting the principal surface and the side wall surface. The first polishing liquid includes a first abrasive grain group having a first average grain size and a second abrasive grain group having a second average grain size larger than the first average grain size. The correspondence relation of the ratio M1/M2 of the mass M1 of the first abrasive grain group included in the first polishing liquid to the mass M2 of the second abrasive grain group to the radius of curvature of the connection of the side wall surface and interposing surface when an end face polishing process is applied using the first polishing liquid is found in advance, the ratio M1/M2 of the first polishing liquid is adjusted so that the radius of curvature becomes a desired value, and the polishing processing is carried out using the first polishing liquid obtained by making the adjustment.SELECTED DRAWING: Figure 3 |
