| 摘要 |
The present invention aims to provide a compact and lightweight piezoelectric actuator, a driving method involving the piezoelectric actuator that can provide a large displacement at a low voltage, and a compact and lightweight information storage device with a high recording density that incorporates such a piezoelectric actuator and has a small moment of inertia of a head when the head is driven. The piezoelectric actuator 110 according to the present invention has four rod-shaped driving sections 111-1, 111-2, 111-3 and 111-4. Of the four rod-shaped driving sections 111-1, 111-2, 111-3 and 111-4, a voltage is applied to the two driving sections 111-2 and 111-3 located along a diagonal line at a time, and the voltage is applied to the two driving sections 111-1 and 111-4 located along the other diagonal line at a different time from the time for the driving sections 111-2 and 111-3, whereby two central sections 112-1 and 112-2 are rotationally driven relative to two end sections 113-1 and 113-2.
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