Acoustic transducer system

Details Acoustic transducer system Acoustic transducer system

H - Electricity

04

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349/67.9

H04R 1/34 (2006.01) G10K 11/26 (2006.01) G10K 13/00 (2006.01) H04R 1/22 (2006.01)

Patent

CA 1278369

ABSTRACT Acoustic Transducer System The acoustic transducer system includes an electroacoustic transducer and a flexural oscillator plate which is coupled to the electroacoustic transducer, The flexural oscillator plate is so constructed that at the system operating frequency it is stimulated to flexural oscillations of a higher order at which on the flexural oscillator plate node lines form between which antinode zones oscillating alternately in opposite phase lie. To influence the sound radiation of the flexural oscillator plate a sonic beam shaper is provided. The sonic beam shaper has soundwave barriers which are im- permeable for soundwaves and which lie spaced from the flexural oscillator plate and acoustically decoupled therefrom in front of first antinode zones oscillating in equal phase with each other, and soundwave-permeable regions which lie between the soundwave barriers in front of the remaining second antinode zones oscillating in opposite phase to the first antinode zones. The sonic beam shaper results in the effect that the flexural oscillator plate radiates only sound- waves of equal phase whilst the soundwaves of opposite phase thereto are suppressed by the soundwave barriers. Fig. 1

528099

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