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11. 发明申请

US20090142626A1 GLASS SUBSTRATE FOR MAGNETIC DISK AND MAGNETIC DISK APPARATUS 有权
标题翻译：用于磁盘和磁盘设备的玻璃基板
公开(公告)号：US20090142626A1
公开(公告)日：2009-06-04
申请号：US12275576
申请日：2008-11-21
申请人： Nobuaki ORITA , Yasuhiro NAKA
发明人： Nobuaki ORITA , Yasuhiro NAKA
IPC分类号： G11B5/62
CPC分类号： G11B5/7315 , C03C19/00 , G11B5/82
摘要： A glass substrate for a magnetic disk satisfies Ra1≦0.8 [nm], 0 [nm]≦Ra1−Ra2≦0.2 [nm], Wa1≦0.6 [nm], and 0 [nm]≦Wa2−Wa1≦0.2 [nm]. Ra1 is an average surface roughness of a first annular area between 1 mm and 3 mm outward from an inner periphery of a main surface of the glass substrate, Ra2 is an average surface roughness of a second annular area between 1 mm and 3 mm inward from an outer periphery of the main surface, Wa1 is an average waviness of the first area in a circumferential direction of the glass substrate having a cycle of 300 μm to 5 mm, and Wa2 is an average waviness of the second area in the circumferential direction having a cycle of 300 μm to 5 mm.
摘要翻译：用于磁盘的玻璃基板满足Ra1 <= 0.8 [nm]，0 [nm] <= Ra1-Ra2 <= 0.2 [nm]，Wa1 <= 0.6 [nm]，0 [nm] <= Wa2-Wa1 <= 0.2 [nm]。 Ra1是从玻璃基板的主表面的内周向外侧的1mm〜3mm之间的第一环状区域的平均表面粗糙度，Ra2是从1mm到3mm之间的第二环状区域的平均表面粗糙度主表面的外周面Wa1是玻璃基板的周向的第一区域的平均波纹度为300μm〜5mm的周期，Wa2是周向的第二区域的平均波纹度，具有 300毫米至5毫米的循环。

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