| 摘要 |
PROBLEM TO BE SOLVED: To provide a lens driving mechanism employing an SMA (Shape Memory Alloy) actuator, which enables to obtain a large displacement amount, while reducing the size and the weight of the driving mechanism. SOLUTION: The lens driving mechanism includes a lens unit 10, a driving member 20 for moving the lens unit 10 in an optical axis AX direction, and the SMA actuator 30. The driving member 20 has a displacement output portion 20out which can be moved in the optical axis AX direction and displacement input portions 20in which receive the input of moving force in a direction orthogonal to the optical axis AX and move the displacement output portion 20out in the optical axis AX direction, and is engaged with a support part 12 of the lens unit 10 at the displacement output portion 20out. The SMA actuator 30 is stretched over guide pieces 211 projectingly provided in the displacement input portions 20in. Moving force orthogonal to the optical axis AX is input to the displacement input portions 20in by the thermal contraction of the SMA actuator 30. COPYRIGHT: (C)2008,JPO&INPIT
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