| 摘要 |
<p>The invention is based on providing a drive detection means for a piezoactuator that can detect an amount driven without requiring adding an encoder or other component while also preventing increasing the load. A rotor 20 is disposed eccentrically to the axis of rotation to change the pressure applied from the rotor 20 to a contact part 13 as the rotor 20 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 20 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.</p> |
