| 摘要 |
PROBLEM TO BE SOLVED: To further enhance the durability of a shape memory alloy wire by making the moving quantity of a lens equal to the expansion and contraction quantity of the shape memory alloy wire to reduce the expansion and contraction quantity of the shape memory alloy wire. SOLUTION: This magnetic coupling type lens driving actuator includes an imaging element, a movable lens which is movable in an optical axis direction, a magnetic member coupled with the movable lens, a lens-barrel housing the imaging element, the movable lens and the magnetic member in an airtightly sealed state, a magnetic field producing means arranged outside the lens-barrel and installed in the optical axis direction in a movable manner and a wire member coupled with the magnetic field producing means at one end thereof to move the magnetic field producing means in the optical axis direction. Two magnetic field producing means are arranged along the optical axis direction at a predetermined interval, have the magnetic members present at positions opposed to each other at a predetermined interval and move the movable lens by the deformation or movement of the wire member. COPYRIGHT: (C)2011,JPO&INPIT |
