Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1990-05-18
1991-08-06
Budd, Mark O.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
310321, 310322, 310323, 310324, 310326, 310328, 310369, 367165, H01L 4108
Patent
active
050380672
ABSTRACT:
A broadly tuned transducer system for pulse echo ranging systems has a rigid plate, to a planar radiating front surface of which is applied at least one layer of acoustic coupling material having a density intermediate between that of the plate and an atmosphere into which the transducer is to be coupled. Three or more driver assemblies spaced apart in a two dimensional array are ridigly secured to a rear surface of the plate, each assembly having a loading block and a piezoelectric element compressed between the block and the plate. The driver assemblies all have the same resonant frequency on axes perpendicular to the plate and are driven in phase; they occupy not less than one-fifth and not more than four-fifths of the area of the rear surface of the plate, which is rigid enough to prevent the excitement of significant flexural oscillations. The arrangement permits the transducer to have a large planar radiating surface while using quite small piezoelectric elements.
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Budd Mark O.
Dougherty Thomas M.
Federal Industries Industrial Group Inc.
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