Patent ID: 6739704
Filing Date: 2004-05-25
Classification: B41J,H01L

Abstract:
A piezoelectric transducer, comprising:a first piezoelectric ceramic layer; a second piezoelectric ceramic layer laminated to the first piezoelectric layer; a first electrodes set including a plurality of electrodes spaced along the first piezoelectric ceramic layer perpendicularly to a laminating direction of the first and second piezoelectric ceramic layers, the first electrodes set defining therebetween at least a first area polarized perpendicularly to the laminating direction; and a second electrodes set including a plurality of electrodes positioned in the second piezoelectric ceramic layer in the laminating direction, the second electrodes set defining at least a second area polarized parallel to the laminating direction, the at least a second area being aligned in the laminating direction with the at least a first area, wherein upon application of a voltage to the first electrodes set and to the second electrodes set, an electric field is generated in the polarization direction in each of the at least a first area and the at least a second area to cause the at least a first area to extend by a longitudinal effect perpendicularly to the laminating direction and the at least a second area to contract by a transversal effect perpendicularly to the laminating direction.