Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1980-03-25
1987-03-17
Budd, Mark O.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
310328, 310334, 310339, 310369, 310317, H01L 4108
Patent
active
046510443
ABSTRACT:
An electroacoustical transducer includes a tubular member. The member has a gap extending the axial length of the member with a restricted circumferential length. The member has a particular thickness and/or diameter to vibrate at a particular frequency.
A plurality of polarized sectionalized transducer elements are in closely stacked relationship within the member to provide unrestrained vibrations of the member at the ends defining the gap. The elements are bonded to the member to vibrate at the particular frequency in accordance with the introduction of alternating current signals to the elements. Means are operatively coupled to the transducer elements to introduce alternating current signals to the elements to produce vibrations of such elements.
In one embodiment, the elements are disposed in an annular configuration in abutting relationship to one another and are bonded to the inner wall of the tubular member. In another embodiment, the elements are disposed in a linear configuration in abutting relationship to one another and are bonded to the inner wall of the tubular member at diametrical positions equally spaced from the gap. The elements are circumferentially polarized. An output member may be coupled to the tubular member at the position of the gap to vibrate with the tubular member.
A plurality of transducers constructed as disclosed above may be disposed in stacked relationshp. The gaps in the tubular members of such transducers may be annularly displaced in phase to produce a particular directional pattern to the acoustic waves produced by such transducer array.
REFERENCES:
patent: 2812452 (1957-11-01), Harris
patent: 3043967 (1962-07-01), Clearwaters
patent: 3100291 (1963-08-01), Abbott
patent: 3142035 (1964-07-01), Harris
patent: 3177382 (1965-04-01), Green
patent: 3182284 (1965-05-01), Green
patent: 3277433 (1966-10-01), Toulis
patent: 3702948 (1972-11-01), Balamuth
patent: 3982144 (1976-09-01), Rogers et al.
Budd Mark O.
Roston Ellsworth R.
Schwartz Charles H.
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