PIEZOELECTRIC ACTUATOR DRIVE DEVICE, ELECTRONIC DEVICE, AND DRIVE METHOD THEREOF

摘要

An electronic device that includes a piezoelectric actuator A and a drive control apparatus (100) for controlling the driving of the piezoelectric actuator, wherein the drive control apparatus (100) includes a drive circuit (111) for supplying a drive voltage signal SDR to the piezoelectric element of a vibrator (12); phase difference detection means (120) for detecting the phase difference that expresses the vibrating state of the vibrator (12); a comparison voltage setting circuit (133) for correcting the target phase difference, which is the target of the vibrating state; and drive frequency setting means (140) for comparing the phase difference with the target phase difference. The piezoelectric actuator A is driven in a highly efficient manner independently of the drive voltage by varying the drive frequency of the drive voltage signal SDR on the basis of the comparison results so that the phase difference is brought closer to the target phase difference.