| 发明名称 |
MAGNETIC-DISK GLASS SUBSTRATE |
| 摘要 |
An edge surface of a magnetic-disk glass substrate containing an alkali metal component as a glass composition is a mirror surface, and in a bearing ratio curve of roughness cross-sectional areas obtained by measuring a surface roughness of the edge surface obtained by etching the edge surface by 2.5 μm, a roughness percentage when a bearing ratio of a roughness cross-sectional area is 50% is 40% or more. |
| 申请公布号 |
US2016372147(A1) |
申请公布日期 |
2016.12.22 |
| 申请号 |
US201515122377 |
申请日期 |
2015.03.31 |
| 申请人 |
HOYA CORPORATION |
发明人 |
AZUMA Shuhei |
| 分类号 |
G11B5/73;C03C15/00;C03C21/00;G11B5/82 |
主分类号 |
G11B5/73 |
| 代理机构 |
|
代理人 |
|
| 主权项 |
1. A magnetic-disk glass substrate containing an alkali metal component as a glass composition, the magnetic-disk glass substrate comprising:
an edge surface that is a mirror surface, the edge surface including a surface with a roughness percentage that is 40% or more when a bearing ratio of a roughness cross-sectional area is 50%, in a bearing ratio curve of roughness cross-sectional areas obtained when a surface roughness of the edge surface obtained by etching the edge surface by 2.5 μm is measured. |
| 地址 |
Tokyo JP |
