发明授权
- 专利标题： Method of producing glass substrate for perpendicular magnetic recording disk
- 专利标题（中）： 用于垂直磁记录盘的玻璃基板的制造方法
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申请号： US12394461申请日： 2009-02-27
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公开(公告)号： US08348721B2公开(公告)日： 2013-01-08
- 发明人: Yuji Horie , Tatsuya Tanifuji , Noriyuki Kumasaka
- 申请人： Yuji Horie , Tatsuya Tanifuji , Noriyuki Kumasaka
- 申请人地址： JP Tokyo
- 专利权人： Nihon Micro Coating Co., Ltd.
- 当前专利权人： Nihon Micro Coating Co., Ltd.
- 当前专利权人地址： JP Tokyo
- 代理机构： Weaver Austin Villeneuve & Sampson LLP
- 优先权： JP2004-129140 20040426
- 主分类号： B24B7/22
- IPC分类号： B24B7/22
摘要：
A glass substrate for perpendicular magnetic recording, having a surface with an average surface roughness of 2.0Å or less and surface height variations of 1Å or less with wavelengths in the range of 0.05 mm-0.5 mm in both radial and circumferential directions, is produced by rotating a glass substrate, supplying polishing slurry containing a specified amount of abrading particles of artificial diamond on its surface, pressing a polishing tape on the surface and causing this polishing tape to travel in a direction opposite to the direction of rotation of the glass substrate.
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