Electrical generator or motor structure – Educational or construction units or kits
Patent
1974-08-23
1976-09-21
Budd, Mark O.
Electrical generator or motor structure
Educational or construction units or kits
310 98, 310 95, 340 10, H01L 4104
Patent
active
039821447
ABSTRACT:
A small low frequency acoustic receiver which is formed into a cylinder or ing by use of a plurality of separate elements of piezoelectric material. Each element is secured with its sides in face-to-face relationship with an electrode between each joined face in contact with each adjacent element. The electrodes are alternately connected into an electrical circuitry for transmitting electrical signals to a receiver.
Other construction techniques may be used to assemble separate elements in a cylindrical arrangement. Over a band of very low frequencies, the cylinder or ring has a high sensitivity (i.e., it produces a large electrical signal) to sound incident in the axial direction compared with its sensitivity in the radial direction. Over this band of very low frequencies the sensitivity of the cylinder or ring is relatively constant for sound incident in the axial direction. This band of very low frequencies is much lower in frequency than any mechanical or acoustical axisymmetric resonance of the cylinder or ring.
REFERENCES:
patent: 2961635 (1960-11-01), Trott
patent: 3043967 (1962-07-01), Clearwaters
patent: 3068446 (1962-12-01), Ehrlich et al.
patent: 3177382 (1965-04-01), Green
patent: 3211931 (1965-10-01), Tehon
patent: 3845333 (1974-10-01), Holloway
Rogers Peter H.
Zalesak Joseph F.
Budd Mark O.
Crane Melvin L.
Schneider Philip
Sciascia R. S.
The United States of America as represented by the Secretary of
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