| 摘要 |
PROBLEM TO BE SOLVED: To provide a drive unit using a shape memory alloy that makes the device compact and suppresses occurrence of tilt, thereby enabling stable rectilinear movement of a small driven body such as a lens. SOLUTION: The drive unit 1 includes: a lens unit having a lens part constituted of a lens 2 and holder 3, a sleeve 6, and a rotation restricting guide part 9; a slide guide shaft 4; and a vibration stopper 5 for restricting the rotation of the rotation restricting guide 9. The drive unit 1 obtains driving force for sliding in the direction of an optical axis via a shape memory alloy wire 8. In the drive unit 1, the shape memory alloy wire is disposed between a suspension part (projecting part 11) disposed outside the sleeve and a fixed terminal part 10 disposed on the fixed part. In addition, the fixed terminal part 10 is disposed in front in the sliding direction and in a position displaced from the suspension part to the direction of the rotation restricting guide part on the other end side. A drive tension application direction when the shape memory alloy wire contracts is inclined by a predetermined angle from an optical axis. COPYRIGHT: (C)2009,JPO&INPIT
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