Patent ID: 7423824
Filing Date: 2008-09-09
Classification: G02B

Abstract:
1. An actuator comprising: an external member having a movement hole; a movable body which moves within the movement hole; and a driving means for mechanically driving the movable body, wherein the driving means has a first driving member and a second driving member capable of pressing an external surface of the movable body and an internal surface of the movement hole, and a third driving member located between the first driving member and the second driving member to apply a substantial driving force to the movable body, the first, second and third driving members being arranged with a predetermined gap therebetween in a moving direction of the movable body, and wherein each of the first driving member, the second driving member, and the third driving member is made of a high-polymer material having responsiveness to an electric field, and the first driving member, the second driving member, and the third driving member are provided between the external surface of the movable body and the internal surface of the movement hole.