Communications – electrical: acoustic wave systems and devices – Signal transducers – Underwater type
Patent
1981-10-28
1984-02-21
Tudor, Harold J.
Communications, electrical: acoustic wave systems and devices
Signal transducers
Underwater type
310337, H04R 1700
Patent
active
044333994
ABSTRACT:
An improved ultrasonic transducer that can be used for cleaning the inner wall surface of water-filled tank, such as a toilet bowl, employs a ceramic disc operating in the planar resonant frequency mode in combination with an acoustic transmission line comprising a solid washer-like annulus bonded to the periphery of the ceramic. The radial dimension of the annulus is made equal to approximately one-half wavelength of sound in the material at the frequency of operation. The annulus serves as an acoustic transmission line to extend the peripheral vibrating surface of the ceramic so that the acoustic power is transferred from the periphery of the ceramic disc to a region closer to the inner wall surface of the tank. The transmission line also increases the radiating area of the transducer element which achieves increased sonic power density in the vicinity of the wall surface.
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The Stoneleigh Trust
Tudor Harold J.
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