| 摘要 |
PROBLEM TO BE SOLVED: To provide a spindle motor having such a constitution that even under excessive impact or the like, excessive collisions due to floatation of a rotation portion is eliminated between a disk and a signal conversion element, and fatal damages are avoided from being given to the signal conversion element or a locking means for positioning the signal conversion element, and to provide a disk drive provided therewith. SOLUTION: The spindle motor 13 comprises a rotating body 5, a stator 11, and a fixed-side bearing member 6 which is fit to a rotating-side bearing member 3 and forms a trochoid fluid bearing, and a chassis 8. A hollow cylindrical portion 2a is formed in a rotor hub portion 2 in proximity to the central axis 1 of rotation, and the columnar portion 7b of a support rod portion 7 fixed on the chassis 8 is disposed in the hollow portion, without contacting the hollow portion. The lower end face of the abutting portion 18b of a cover 18 is abutted against the upper end face of the columnar portion 7b of the support rod 7, and a predetermined small gap is provided in between the upper end face 2c of the rotor hub portion 2 and the lower end face of the abutting portion 18b of the cover 18. COPYRIGHT: (C)2005,JPO&NCIPI
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