Multi resonance unibody ultrasonic transducer
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United States of America Patent
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-
Dec 23, 1997
Grant Date -
N/A
app pub date -
May 28, 1996
filing date -
Dec 5, 1994
priority date (Note) -
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Abstract
A multi-resonance frequency ultrasonic transducer has 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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