Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1994-12-05
1996-11-26
Dougherty, Thomas M.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
310317, 310323, H02N 200
Patent
active
055788882
ABSTRACT:
A multi-resonance frequency ultrasonic transducer as a plurality of useful resonance frequencies for wire bonding operation and comprises an integral unibody with a rectangular aperture in the center of its mass. A multi-frequency stack of transducer drivers is mounted in the rectangular aperture with compression wedges. The length L of the stack of transducer drivers is equal to or less than one-quarter of one wavelength of the lower useful resonance frequency and the design envelopes for the useful frequencies embrace two or more useful fixed frequencies separated from spurious unusable frequencies by a minimum of two kilohertz.
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Dougherty Thomas M.
Kulicke and Soffa Investments, Inc.
Sowell - ATT John B.
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