Furuno Electric Company Limited

Kazuhiko Kamei

Takeharu Yamaguchi

Ryouichi Suetoshi

The invention provides a multi-frequency transducer capable of obtaining desired directivity regardless of frequencies. Parallelepiped-shaped transducer elements () are used as transducer elements and a plurality of such transducer elements () are arranged in an array. The transducer elements () are caused to resonate using a resonant frequency in fundamental vibration mode and a resonant frequency in harmonic vibration mode determined by the dimensions (A, B) of a short edge () and a long edge () perpendicular to a longitudinal edge () of each transducer element () to transmit and receive at multiple frequencies. The angle of directivity (&#x3b8;) of the transducer elements is controlled by the dimension (C) of the longitudinal edge which is set to a value which does not affect resonance in either the fundamental vibration mode or the harmonic vibration mode.

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Kobe, Japan

Kazuhiko Kamei