| 摘要 |
Provided are an actuator and a hard disk drive having the same. The actuator having a magnetic head and circularly movably mounted to move the head to a predetermined position on a disk, the actuator including: at least two arm members extending parallel to each other; a spacer interposed between and contacting the arm members to maintain a constant distance between the arm members and having a step portion to contact the arm members; a pivoting member inserted through throughholes respectively formed in the arm members and spacer, wherein the arm members and the spacer form a stack assembly and rotate around the pivot member; and a nut member screwed with the pivoting member at an end of the pivoting member and clamping the arm member and spacer with the pivoting member, wherein the step portion has a ring-shaped contact surface. In the actuator, the clamping deformation of a head stack assembly is prevented, thereby making it possible to accurately control the gap between a magnetic head and a recording side of the disk. Since the gap is constantly maintained, the head may not be damaged by external disturbance, thereby increasing product reliability.
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