| 摘要 |
PURPOSE: A duplex dynamic pressure bearing of a spindle motor is provided to prevent a noise and defects generated when starting and stopping a spindle motor. CONSTITUTION: An aerodynamic bearing(140) includes a disk type bearing body(142), a plurality of grooves(142a,142b,142c) covering a circumference of the bearing body with having predetermined gaps so that an air layer is formed between a hub(120) and the bearing body to has strength letting air flow support load after moving the hub. A hydrodynamic bearing(150) includes a plurality of grooves formed on at least one surface of a spindle shaft(126), a sleeve(151) covering the spindle shaft, and a thrust plate(128). A gap between the spindle shaft and the sleeve is filled with fluid to support the hub rotatively.
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