Piezoelectric element drive device, electronic apparatus,...

Details Piezoelectric element drive device, electronic apparatus,... Piezoelectric element drive device, electronic apparatus,...

2009-03-24

2011-12-13

Rosenau, Derek (Department: 2837)

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

Reexamination Certificate

active

08076822

ABSTRACT:
A drive device for a piezoelectric element includes a transformer, a driver circuit, and a control circuit. The transformer has a primary side and a secondary side. The drive circuit causes the secondary side to generate a drive signal whose frequency varies in accordance with a control signal input to the primary side and to supply the generated drive signal to the piezoelectric element. The control circuit changes a frequency of the control signal in a predetermined frequency range multiple times, detects an impedance change in the piezoelectric element each time the control-signal frequency is changed, determines a resonant frequency of the piezoelectric element on the basis of a transition of the impedance change, and controls the control-signal frequency so that the determined resonant frequency is obtained.

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Office Action from Japanese Application No. 2008-080273, dated Jul. 27, 2010.

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