| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a method for grinding a glass substrate which grinds the glass substrate with the excellent maximum thickness deviation, and also to provide a method for manufacturing the glass substrate for a magnetic recording medium that includes a process of using the grinding method. <P>SOLUTION: The method for manufacturing the glass substrate for the magnetic recording medium is constituted so that grinding surface shapes of upper and lower surface plates of an double-sided grinding machine are measured before grinding the glass substrate. When a gap between grinding surfaces of the upper and lower surface plates at the inner circumferential end is set as Din, and the gap between the grinding surfaces of the upper and lower surface plates at the outer circumferential end is set as Dout, the difference ΔD obtained by subtracting Din from Dout (=Dout-Din) is set to -30 to +30 μm. <P>COPYRIGHT: (C)2011,JPO&INPIT |
