发明名称 |
Hydrodynamic bearing device, spindle motor, and recording and reproducing apparatus |
摘要 |
An annular groove is provided to the rotary portion and/or the fixed portion in a bearing seal portion, and its cross section has a shape approximated by an arc. The annular groove is such that the relationship between the groove width W in a direction following the surface constituting a bearing seal portion and the groove depth Dg in a direction perpendicular to the surface constituting the bearing seal portion is Dg/W<0.4.
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申请公布号 |
US8064166(B2) |
申请公布日期 |
2011.11.22 |
申请号 |
US20080276862 |
申请日期 |
2008.11.24 |
申请人 |
PANASONIC CORPORATION |
发明人 |
KAINOH NAOSHI;SHIRAI AKIHITO;NISHIMOTO YOICHI;NAKAMURA JUNICHI |
分类号 |
G11B5/60 |
主分类号 |
G11B5/60 |
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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