Patent ID: 7119475
Filing Date: 2006-10-10
Classification: H02N

Abstract:
1. A drive method for a piezoelectric actuator comprising: preparing the piezoelectric actuator having an oscillator being configured to oscillate due to the supply of a drive signal with a specific frequency to a piezoelectric element, and contact sections being convexities being provided on opposite sides of the oscillator and being configured to contact a driven object; detecting a first detection signal indicating an oscillating state of the oscillator and controlling a frequency of the drive signal sent to the piezoelectric element based on the first detection signal and the drive signal, or based on the first detection signal; detecting the amplitude of the first detection signal; comparing the amplitude and a standard amplitude value of the first detection signal; and controlling the frequency of the drive signal based on the results of comparing the amplitude and the standard amplitude value of the first detection signal.