| 摘要 |
PROBLEM TO BE SOLVED: To provide a lens actuator which is operable at high speed by decreasing a gain peak at a high-order resonance mode due to the deformation of a bobbin and expanding an operating bandwidth. SOLUTION: A bobbin 1 of a movable part is so formed to have a pair of through-holes 6 and 7 having shapes different from each other in order to provide a clearance of a yoke, and the frequencies of deformation mode at through-holes are made different from each other. Thus, the operating bandwidth is expanded by separating the gain peaks at a high order resonance mode and decreasing the heights of the gain peaks. COPYRIGHT: (C)2004,JPO
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