| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a magnetic disk device capable of preventing unbalanced buoyancy caused by dynamic pressure from occurring. <P>SOLUTION: A magnetic disk device comprises: a motor provided with a rotational body of an axial rotation structure in which a shaft and a hub are integrally formed, where the shaft is inserted into a bearing part, which is a dynamic pressure bearing, of a fixed sleeve and the hub holds one or multiple recording media and is fixed to the shaft by inserting the shaft into a hub penetration hole that penetrates through a center part of the hub; a top clamp on which a top clamp penetration hole that penetrates through a center part thereof is formed and which clamps the recording media held by the hub together with the hub; and a screw which is fastened to a thread groove formed in the shaft by being inserted into the top clamp penetration hole and the hub penetration hole. A thrust surface of the hub is provided with a slant that gradually separates from a surface orthogonal to a rotation center axis towards a screw side, as the thrust surface extends from the rotation center axis towards the outer periphery. <P>COPYRIGHT: (C)2013,JPO&INPIT |
