PURPOSE:To obtain an ultrasonic wave transducer improved in electroacoustic transducing efficiency and wide frequency characteristic transducing efficiency and wide frequency characteristics by a couple of electrode terminals to each piezoelectric oscillator of multilayered structure and weighting the intensity of an electric field applied to each piezoelectric layer. CONSTITUTION:Electrodes 3 are fitted to two piezoelectric plates 1 and 2 which differ in thickness to constitute a piezoelectric oscillator, which is stuck and layered by using an adhesive 4 to constitute the transducer of multilayered structure. This transducer, a sound field medium 5, and a back surface load medium 6 are joined together by using the adhesive 4 and used while coupled acoustically. The intensity of the electric field applied to each piezoelectric layer is weighted by connecting an impendance element 11 between electrode terminals 8' and 10 of the piezoelectric oscillator 2 in parallel and applying an exciting voltage to terminals 12 and 13, or connecting an impedance element 14 to the electrode terminal 10 of the piezoelectric oscillator 2 in series and applying the exciting voltage between the terminals 15 and 16. Consequently, wide-band frequency characteristics are obtained without any decrease in transducing efficiency.
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