| 摘要 |
A disk drive includes: a motor that rotates a disk; an auto-balancer connected to a rotating portion of the motor and changing its center of mass; a base secured to the motor and connected to an external member via a first elastic member; and a dynamic vibration absorber connected to the base via a second elastic member. If the disk whirls while rotating, a relationship between a first or second natural frequency of a first or second vibration system, including the base, first elastic member and external member or the dynamic vibration absorber, second elastic member and base, as measured parallelly to the base plane and a rotational frequency of the disk is defined so that a phase angle of 120 to 180 degrees is formed between a direction from a whirling center axis toward a center of mass of the disk and a direction from the whirling center axis toward the center of mass of the auto-balancer. Thus, when a disk having an eccentric center of mass is rotated at a high velocity, the vibration generated can be minimized and a stabilized write/read operation is realized.
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