| 摘要 |
A bearing mechanism having a sleeve including at an inner circumferential surface thereof a first bearing surface and a relief portion including a diameter greater than that of the first bearing surface is used in a spindle motor. An axial length of the first bearing surface is between approximately 1.2 mm and 1.8 mm. By virtue of such configuration, characteristics of the spindle motor are improved and an operating life of the spindle motor is extended.
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