DRIVE APPARATUS OF VIBRATION-TYPE ACTUATOR, INTERCHANGEABLE LENS, AND IMAGE PICKUP APPARATUS USING THE SAME

摘要

When a vibration-type actuator is in a non-driving period, at least one of a voltage amplitude and a phase difference of an alternate signal applied to an electrode of a piezoelectric element is set to be equal to a minimum value or a maximum value of a dead zone in terms of the voltage amplitude or the phase difference.

主权项

1. A drive apparatus of a vibration-type actuator comprising:
an alternate current signal generation unit configured to generate a first alternate current signal applied to a first electrode of an electric-mechanical energy conversion element of a vibrator and a second alternate current signal applied to a second electrode of the electric-mechanical energy conversion element; and a control unit configured to set a voltage amplitude of the first alternate current signal and a voltage amplitude of the second alternate current signal such that when the vibrator is in a non-movement state, the voltage amplitudes are set to be greater than 0 and to be in a dead zone, wherein the dead zone is a range of the voltage amplitudes of the first alternate current signal and the second alternate current signal applied to the electric-mechanical energy conversion element, within which no driving force on a driven element is generated.