Piezoelectric actuator and device

Details Piezoelectric actuator and device Piezoelectric actuator and device

2006-10-10

2006-10-10

Schuberg, Darren (Department: 2834)

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

C310S365000, C310S366000, C310S323010, C310S323160

Reexamination Certificate

active

07119476

ABSTRACT:
Detection electrodes82D and82E are formed at positions that include an antinode of a flexural oscillation mode. The strain of flexural oscillation reaches a maximum and the effects on the phase difference in the longitudinal oscillation mode can be cancelled out. The detection electrodes82D and82E are formed at the positions of drive electrodes82B and82C used to excite the flexural oscillation mode. A phase difference in the flexural oscillation mode opposite in sign relative to the longitudinal oscillation mode is created making it is easy to classify based on the phase difference between a frequency at which the longitudinal oscillation mode is dominant and a frequency at which the flexural oscillation mode is dominant. Thus, reliable control can be achieved based on the oscillation behaviors at each frequency ensuring a satisfactory drive force based on oscillation in the longitudinal oscillation mode.

REFERENCES:
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patent: 6657361 (2003-12-01), Morales Serrano et al.
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patent: 2003-304693 (2003-10-01), None
patent: 2003304693 (2003-10-01), None

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