发明名称 |
Method of surface-finishing glass substrate for magnetic disks and glass substrate for magnetic disks |
摘要 |
An inner peripheral edge of a toroidal glass substrate for a magnetic disk is subjected to mechanical polishing in such a manner that the surface roughness is no greater than 9 nm in terms of Rmax. Then, the inner peripheral edge is subjected to chemical polishing to remove at least 2 μm of a surface layer. The inner peripheral edge has a non-conventional mirror-finished surface obtained by mechanical polishing. Thus, sufficient ring strength is obtained even when the chemical polishing depth is smaller than in the past. A polishing depth of less than 5 μm is sufficient. |
申请公布号 |
US8109808(B2) |
申请公布日期 |
2012.02.07 |
申请号 |
US20080087050 |
申请日期 |
2008.03.24 |
申请人 |
UCHIYAMA YOSHIO;DOI HIROSHI;ISHIDA GEN;TOYO KOHAN CO., LTD. |
发明人 |
UCHIYAMA YOSHIO;DOI HIROSHI;ISHIDA GEN |
分类号 |
G11B5/84;B24B1/00;C03C15/02;G11B5/71 |
主分类号 |
G11B5/84 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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