Patent ID: 6433459
Filing Date: 2002-08-13
Classification: H02N

Abstract:
A piezoelectric actuator comprising:a piezoelectric device having a first end and a second end in a prescribed direction thereof, said piezoelectric device being capable of displacing in the prescribed direction; a driving member an end of which is fixed on the first end of the piezoelectric device; a holder to which the second end of the piezoelectric device is fixed; a driven member coupled with the driving member by a friction force and movable in the prescribed direction; a first driver for charging and/or discharging the piezoelectric device by applying a driving voltage in a same direction as a polarization direction of the piezoelectric device; a second driver for charging and/or discharging the piezoelectric device at substantially the same charging and discharging speed as the first driver by applying the driving voltage in an opposite direction to the polarization direction; a setting data modifier for modifying at least one of a first driving time period of the first driver and a second driving time period of the second driver; and a driving controller for driving the first driver and the second driver, alternately.