| 摘要 |
In an impact type piezoelectric actuator, a driven member is movably coupled with a driving member by a friction force and the driving member is reciprocally moved by expansion and contraction of a piezoelectric device. The piezoelectric actuator is expanded and contracted by charge and discharge of electric charge thereto. A driving controller controls to vary the charging time period and the discharging time period for changing the expansion speed and the contraction speed of the piezoelectric device, so that the driven member can be moved relative to the driving member.
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