Patent ID: 7649301

Claim:
An actuator comprising: a pair of driving portions spaced apart from each other, the pair of driving portion being constituted from independent plates; a movable portion provided between the pair of driving portions, the movable portion having a rectangular shape; a pair of supporting portions for supporting the pair of driving portions and the movable portion; a pair of first elastic connecting portions which respectively connect the pair of driving portions to the pair of supporting portions so that each of the driving portions can rotate with respect to the supporting, wherein each of the pair of first elastic connecting portions is constructed from two connecting members each spaced from a rotation central axis by a predetermined distance; and a pair of second elastic connecting portions which respectively connect the movable portion to the pair of driving portions so that the movable portion can rotate in accordance with the rotation of the pair of driving portions, wherein each of the pair of second elastic connecting portions is constructed from a connecting member coaxially provided with respect to the rotation central axis; wherein each of the pair of driving portions rotates around a rotation central axis of the actuator by application of an alternating voltage, so the movable portion rotates around the rotation central axis of the actuator, wherein the torsional rigidity of each of the first elastic connecting portions is larger than that of each of the second elastic connecting portions, and wherein the two connecting members of each of the pair of first elastic connecting portions and the connecting member of each of the pair of second elastic connecting portions have the same shape and size as each other.