| 摘要 |
PROBLEM TO BE SOLVED: To provide a lens drive device having a simple structure and a small size. SOLUTION: The lens drive device 1 includes: lens holders 3 and 5; a drive shaft 21 in which one end of each of the lens holders 3 and 5 is inserted and which is disposed along the direction of the optical axis of the lenses 14 and 16; and a piezoelectric element 17 disposed at the basal end 21a of the drive shaft 21. The basal end 21a of the drive shaft 21 is fixed to the oscillator 19 of the piezoelectric element 17. The drive shaft 21 is vibrated in the direction of its axis by the vibration of the oscillator 19, produced by causing a pulse current to flow in the piezoelectric element 17. The lens holders 3 and 5 are moved in the direction of the optical axis by the repetition of inertia force and frictional force of the holders relative to the drive shaft 21. COPYRIGHT: (C)2007,JPO&INPIT
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