| 摘要 |
One preferred embodiment of the present invention provides a dynamic pressure bearing formed of a porous material into a shape of a cylindrical sleeve, for rotatably supporting a shaft inserted thereinto, comprising a first groove portion being formed circumferentially in a part of the inner circumferential surface of the dynamic pressure bearing; a second groove portion being formed circumferentially in the inner circumferential surface of the dynamic pressure bearing so as to have an intervening portion of the inner circumferential surface of the dynamic pressure bearing interposed between the first groove portion and the second groove portion; and a connection groove formed in the intervening portion so as to link the first groove portion and the second groove portion, the connection groove having at a bottom surface thereof a lower porous open ratio than a porous open ratio at any portion except for the bottom surface in the intervening portion.
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