发明名称 |
Glass substrate having surface protrusions for use as a magnetic disc substrate |
摘要 |
Disclosed herein is a substrate for a magnetic disc comprising a glass substrate having fine protrusions on its surface, the protrusions having a height of 50 to 1000 ANGSTROM , a width of 0.01 to 1 mu m, a density of 10 to 1000 per 100 mu m2 and an area ratio of 0.1 to 50%, and a ratio of peak height on a mean line (Rp) to maximum height (Rmax) with respect to surface roughness of the substrate being at least 60%. Further, a process for preparing the substrate and a magnetic disc having the substrate are disclosed. Because the substrate according to the present invention has appropriate protrusions on its surface, a friction force and an adsorbing force between a head and a magnetic disc can be reduced, leading to the improvement of the CSS and the anti-head stick properties. In addition, the S/N ratio is not affected because the fine concave portions formed on the surface of the substrate are shallow.
|
申请公布号 |
US5618448(A) |
申请公布日期 |
1997.04.08 |
申请号 |
US19950447604 |
申请日期 |
1995.05.23 |
申请人 |
MITSUBISHI KASEI CORPORATION |
发明人 |
KUROE, TORU;YOKOYAMA, FUMIAKI;MOURI, DAISUKE |
分类号 |
C03C15/00;G11B5/73;G11B5/738;G11B5/84;(IPC1-7):C03C15/00;C09K13/08 |
主分类号 |
C03C15/00 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|