发明授权
US06836040B2 Spindle motor using hydraulic bearing and disk drive on which spindle motor is mounted
失效
使用主轴电机安装的液压轴承和磁盘驱动器的主轴电机
- 专利标题: Spindle motor using hydraulic bearing and disk drive on which spindle motor is mounted
- 专利标题(中): 使用主轴电机安装的液压轴承和磁盘驱动器的主轴电机
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申请号: US10145729申请日: 2002-05-16
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公开(公告)号: US06836040B2公开(公告)日: 2004-12-28
- 发明人: Minoru Watanabe , Toshio Mamiya , Takashi Yamada , Kazuyuki Yamamoto
- 申请人: Minoru Watanabe , Toshio Mamiya , Takashi Yamada , Kazuyuki Yamamoto
- 优先权: JPP2001-151137 20010521
- 主分类号: H02K516
- IPC分类号: H02K516
摘要:
A spindle motor using a hydraulic bearing is provided, wherein an R-face or C-face is formed on each of upper and lower edges of an outer periphery of a rotating disk portion rotatable integrally with a spindle, and the R-face or C-face is formed into a mirror-finished surface having a surface roughness of 0.3 s or less in Ra, preferably, 0.1 s or less in Ra. Alternatively, a recess may be formed in a portion, facing to each of the upper and lower edges of the outer periphery of the rotating disk portion, of an inner wall surface of the hydraulic bearing. Such a spindle motor provides a disk drive capable of suppressing a variation in rotational speed of the spindle motor caused by tilting of the spindle due to vibration and impact, thereby ensuring a stable recording or reproducing operation.