Piezoelectric transducer apparatus having a modal-shaped electrode
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United States of America Patent
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Jul 22, 2003
Grant Date -
Apr 10, 2003
app pub date -
Jul 30, 2001
filing date -
Jul 31, 2000
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An innovative piezoelectric transducer apparatus having a piezoelectric workpiece with a modal-shaped actuator electrode for converting an input energy of one form into an output energy of another form. The piezoelectric workpiece comprises an actuator section and a sensor section. The actuator section is formed in the piezoelectric workpiece and has a modal-shaped electrode for exciting the piezoelectric workpiece into mechanical vibration upon driven by the input energy. The sensor section is also formed in the piezoelectric workpiece and has a sensor electrode for delivering the output energy to an external load of the apparatus by picking up the energy generated by the excitation. The modal-shaped actuator electrode has a shape function defined by the mathematical solution function of the governing equation of the piezoelectric workpiece under the condition that the piezoelectric workpiece being vibrating in a selected resonant mode.
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