Piezoactuator drive detection device and electronic device

Details Piezoactuator drive detection device and electronic device Piezoactuator drive detection device and electronic device

2006-06-28

2008-10-21

Budd, Mark (Department: 2834)

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

C310S323020, C310S323090

Reexamination Certificate

active

07439650

ABSTRACT:
To provide a drive detection means for a piezoelectric actuator that can detect an amount driven without requiring adding an encoder or other component while also preventing increasing the load. A rotor is disposed eccentrically to the axis of rotation to change the pressure applied from the rotor to a contact part as the rotor is driven. When the pressure changes, the amplitude of the detection signal output from the detection electrode18of the piezoelectric element changes in conjunction with rotor rotation, and how much the rotor has been driven can be detected by detecting the amplitude change. Size and thickness can therefore be reduced because providing an encoder, switch, or other component is unnecessary, and current consumption can also be reduced.

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patent: 2000-199718 (2000-07-01), None
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