Rotational actuator for optical device and camera module having the same

摘要

A rotation driving apparatus for an optical device includes a rotation shaft rotatable in a fixed position and a rotation shaft fixed to the rotation shaft in a first direction so as to apply a rotation moment to the rotation shaft, Wherein the first shape memory alloy wire has a first shape memory alloy wire and a second shape memory alloy wire, the first shape memory alloy wire having a length corresponding to a length of the first shape memory alloy wire, the first shape memory alloy wire being fixed in a second direction opposite to the first direction, A second shape memory alloy wire having a property of shrinking its length; And supplying current to the first shape memory alloy wire when rotating the rotation shaft toward the first direction and supplying current to the second shape memory alloy wire when rotating the rotation shaft toward the second direction And a control unit for performing control.