Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1998-12-21
2000-06-27
Dougherty, Thomas M.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
310336, H02R 1700, H01L 41053
Patent
active
060810645
ABSTRACT:
The acoustic transducer system includes a flexural vibrating plate coupled to an electromechanical transducer and so configured that it is stimulated to higher order flexural vibrations at the system operating frequency, at which nodal lines form on the flexural vibrating plate between which first and second antinodal zones are located oscillating alternatingly opposite in phase. For influencing the sound radiation, in the second antinodal zones oscillating in phase with respect to each other and opposite in phase in relation to the first antinodal zones one mass ring each is arranged on the rear side of the flexural vibrating plate facing away from the transmission medium concentrically to the centerpoint of the flexural vibrating plate. Due to the increased mass the second antinodal zones oscillate at a substantially smaller amplitude than the first antinodal zones so that the sound waves opposite in phase generated by the first and second antinodal zones are unable to fully cancel each other out, as a result of which a radiation pattern materializes having a pronounced directivity in the direction perpendicular to the flexural vibrating plate.
REFERENCES:
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Flogel Karl
Klotz-Engmann Gerold
Pfeiffer Helmut
Dougherty Thomas M.
Endress & Hauser GmbH & Co.
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