Patent ID: 7576475

Claim:
An actuator device including a laminated body, comprising: (a) a plurality of displacement functioning layers which are displaced in a direction of thickness in response to application of an electric field; the displacement functioning layer including: (a-1) a displacement region which is displaced in a direction of thickness in response to the application of the electric field; and (a-2) a pair of displacement functioning layer electrode regions which are separated by the displacement region, and (b) a plurality of electrode functioning layers which are adapted to hold the displacement functioning layer therebetween to apply the electric field in the direction of thickness of the displacement functioning layer, the electrode functioning layer including: (b-1) an insulation region which is formed of a different material than the material used for the displacement region and provided in a vicinity of an interface of the displacement region and the displacement functioning layer electrode region of the displacement functioning layer; and (b-2) a pair of electrode functioning layer electrode regions which are separated by the insulation region, wherein the laminated body includes the displacement functioning layer and the electrode functioning layer, each of the pair of the displacement functioning layer electrode regions and each of the pair of the electrode functioning layer electrode regions are electrically connected to each other, and those connected displacement functioning layers and electrode functioning layers compose electrode sections which are adapted to apply the electric field to the displacement region.