| 摘要 |
The present invention has been made in an effort to provide a spindle motor using a fluid dynamic pressure bearing, in which sealing of a sealing part including an operating fluid interface may be more effectively performed at the time of operation or non-operation of the spindle motor. According to the preferred embodiments of the present invention, the first protrusion is formed to correspond to the dynamic pressure groove, thereby making it possible to prevent the leakage of the operating fluid at external oscillation having various bands at the time of operation of the spindle motor. In addition, it is possible to minimize the leakage of the operating fluid through the second protrusion even though a balance between capillary force and atmospheric pressure is broken in the sealing part at the time of non-operation of the spindle motor. |
