| 摘要 |
<p>The present invention relates to an HDD glass substrate manufacturing method that uses a polishing brush, the external form of which is roughly cylindrical and which satisfies the following expressions (1)-(3) when the maximum length of the grooves in the substrate stacking direction is L1, the maximum length of the grooves in the radial direction is L2, the diameter of the main body is L3, the diameter of the brush at a position that is a distance L2 from the brush tip is L4, the area of the groove in a cross-section in the substrate stacking direction is S, and the area of the brush up to the position that is a distance L2 from the tip in a radial cross-section is T. 0.5L1 < L3 < 1.5L1 ... (1) 0.8S < T < 1.5S ... (2) L4 < L3 ... (3)</p> |
