Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Reexamination Certificate
2007-01-09
2007-01-09
Dougherty, Tom (Department: 2834)
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
C310S323210, C310S337000
Reexamination Certificate
active
10497274
ABSTRACT:
The invention concerns an ultrasonic transducer, which is assembled from several parts. These parts are a protecting plate, a piezoelectric disc and a housing. Joining of the parts for transducers are normally done by means of TIG welding or laser welding, but these are relatively costly processes, which also has an impact on the transducer, especially the piezoelectric disc, due to the heat. In order to reduce the heat load and simultaneously simplify manufacturing an ultrasonic transducer is suggested, in which the protecting plate and the housing consists of electrically conducting materials of different kinds and where joining of housing and plate is done by using a mechanical force influence and an electrical current which flows through plate and housing. Also, a method for joining the parts of an ultrasonic transducer is described.
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Jesper Schmidt Hansen and Dr.-Ing. Jean Bruland, “Verbessem der Buckelschweisseneignung durch metallische Überz üge am Beispiel von Werkstoffen mit unterschiedlichen Eigenschaften”, Sondetagung Widerstandsschweissen Conference, May 7-8, 1998, pp. 1-8, Duisburg, GERMANY.
Aguirrechea J.
Dougherty Tom
Siemens Flow Instruments A/S
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