发明名称 |
MAGNETIC DISK SUBSTRATE, MAGNETIC DISK, AND MAGNETIC DISK DEVICE |
摘要 |
A magnetic disk substrate having a flat main surface, an end face, and a chamfered face formed between the main surface and the end face. The substrate has an offset portion, present on the main surface within a range of 92.0 to 97.0% in a radial direction from a center of the substrate. A distance from the center of the substrate to the end face of the substrate in a radial direction is 100%, the offset portion being raised or lowered with respect to a virtual straight line connecting two points on the main surface, set at positions of 92.0% and 97.0%. A maximum distance from the virtual straight line to the offset portion in a direction perpendicular to the virtual straight line is a “maximum offset value.” |
申请公布号 |
SG10201504278Q(A) |
申请公布日期 |
2015.07.30 |
申请号 |
SG10201504278Q |
申请日期 |
2008.02.19 |
申请人 |
HOYA CORPORATION;HOYA GLASS DISK (THAILAND) LTD. |
发明人 |
TAKIZAWA, TOSHIO;PHANDON, KRAISORN;NISHIMORI, KENICHI |
分类号 |
C03C21/00;G11B5/73 |
主分类号 |
C03C21/00 |
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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