MULTILAYER TYPE 2-2 PIEZO-COMPOSITE ULTRASONIC TRANSDUCER AND METHOD FOR THE SAME

摘要

A multilayer 2-2 piezo-composite ultrasonic transducer and a manufacturing method thereof are provided to cause a large displacement by a low voltage and to use a wide range of frequency. Two first inner electrode layers are exposed from a left side of a piezoceramic plate and directly contacted with a first outer electrode layer. The first inner electrode layers are not exposed from a right side of the piezoceramic plate but buried under a piezoelectric layer apart from a second outer electrode layer. Two second inner electrode layers are arranged to be opposed to the first inner electrode layers and contacted with the outer electrode layer, which is not contacted with the first inner electrode layers. The first and second inner electrode layers are alternatively arranged in the piezoelectric layers. When electric power is supplied to the outer electrode layers, a voltage is induced between the first and second inner electrode layers.