Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1998-02-18
2000-02-15
Budd, Mark O.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
310334, H01L 4108
Patent
active
060256702
ABSTRACT:
Ultrasonic transducer with a selectable beamwidth comprising a body of piezoelectric material in the form of an annulus having an outer diameter D and a thickness T. The body has proximal and distal generally planar parallel surfaces and a centrally disposed hole extending therethrough. The body has a cylindrical wall with a width W extending from the hole to the outer diameter. The transducer is capable of operating at low and high resonance frequencies with the low frequency resonance being determined by the diameter D and an aspect ratio of D/T and the high frequency resonance being determined by the thickness T and an aspect ratio of W/T.
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Barletta Vincent A.
Chechelski Victor
Corl Paul D.
Pao Michael C.
Budd Mark O.
Cardiometrics Inc.
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