Communications – electrical: acoustic wave systems and devices – Signal transducers
Patent
1991-05-28
1992-11-17
Eldred, J. Woodrow
Communications, electrical: acoustic wave systems and devices
Signal transducers
367155, 367157, 310322, 310334, 128 24AA, 12866203, H04R 1700
Patent
active
051649209
ABSTRACT:
A composite ultrasound transducer (array) contains piezoelectric ceramic transducer elements which radiate substantially in the longitudinal direction, and are embedded in a polymer matrix. The transducer elements have such a geometrical structure, and are arranged relative to each other, so that the development of oscillation modes perpendicular to the longitudinal direction of the transducer elements is suppressed. A method for manufacturing the composite ultrasound transducer includes the steps of filling a plastic form, having a "negative" of the desired shape of the transducer elements, with ceramic slurry, and pyrolyzing the plastic form after the slurry dries therein. The resulting voids between the hardened ceramic elements are filled with polymer to create the overall composite transducer. The transducer elements can thus be given an arbitrary shape and arrangement, such as hexagonal or irregular square structures, having a trapezoidal cross-section in planes parallel to the longitudinal axis of the transducer elements.
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Bast Ulrich
Cramer Dieter
Kaarmann Hans
Lubitz Karl
Vogt Martina
Eldred J. Woodrow
Siemens Aktiengesellschaft
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