| 摘要 |
PROBLEM TO BE SOLVED: To provide a dynamic pressure bearing device capable of preventing undesired displacement of a rotating base body against external force working at a position in the specific angular direction against an axis of rotation, a rotational drive furnished with it and a recording device furnished with it. SOLUTION: Lubricating fluid 23 is interposed in a bearing clearance 25 between a fixed support body 21 and the rotating base body 22, and the rotating base body 22 is supported by its dynamic pressure free to rotate. Bearing rigidity krr on a portion in these specific angular directions C1, C2 is made higher than the bearing rigidity krr on a portion in the other angular direction by increasing the dynamic pressure on the portion in the specific angular directions C1, C2 against the axis of rotation L10 higher than the dynamic pressure in the other angular direction. It is possible to constitute to improve the dynamic pressure on the portion in the specific angular directions C1, C2 by reducing the bearing clearance 25, by matching depth of a dynamic pressure groove with the bearing clearance, by increasing an occupied area of the dynamic pressure groove, by decreasing a bending angle of the dynamic pressure groove, etc.
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