Patent ID: 7446458

Claim:
A piezo-electric ceramic transducer which bends in a thickness direction thereof by applying voltage to the transducer, the transducer comprises: two-piezo-electric active layers having at least one piezo-electric layer respectively, said piezo-electric active layers being applied voltages via electrode layers so that one of said piezo-electric active layer expands and the other one contracts, an intermediate insulating layer disposed between said two piezo-electric active layers, two surface insulating layers, between which said two piezo-electric active layers are placed, disposed on both surfaces of said piezo-electric ceramic transducer in a thickness direction thereof, electrode pads disposed on only one of said two surface insulating layers and electrically connected with said electrode layers, wherein said piezo-electric active layers, said intermediate layer and said surface insulating layers are made of the same material as one another and are integrated with one another by sintering, and wherein the electrode pad comprises; two first pad portions for polarization electrically connected with said electrode layer of one of said piezo-electric active layers, and two second pad portions for polarization electrically connected with said electrode layer of the other piezo-electric active layer, said first and second pad portions being used in a polarization process for said piezo-electric layers; and a coupling portion for coupling the first pad portions with the second pad portions.