| 摘要 |
A disk clamp includes a flat plate. A receiving hole penetrates through the flat plate. Through holes penetrate through the flat plate on an imaginary circle defined around the longitudinal center axis of the receiving hole. Depressions are formed on the front surface of the flat plate at positions between the through holes. The disk clamp is mounted on a rotor of the spindle motor, for example. A screw is received in a screw bore formed in the flat plate when the disk clamp is mounted on the rotor. The screw is screwed into the rotor. A disk medium is mounted on the spindle motor. In the process of screwing, a jig is inserted in the through hole. The jig is received in a bottomed hole formed in the rotor. The jig serves to restrict relative rotation between the disk clamp and the rotor.
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