Global IP Counselors, LLP
Piezoactuator drive detection device and electronic device
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 electrode 18 of 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.
Seiko Epson Corporation
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Akihiro
Sawada