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US 2015/0146080 A1Published application
Drive apparatus of vibration-type actuator, interchangeable lens, and image pickup apparatus using the same
AssigneeCanon Kabushiki Kaisha
InventorHiromitsu Morita
Life of this patent
Estimating the term…
Abstract
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.
Claims20
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.
1 more element
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 phase difference between the first alternate current signal and the second alternate current signal
- such that when the vibrator is in a non-movement state, the phase difference is set to a value in a dead zone other than 0,
- wherein the dead zone is a range of the phase difference between 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.
2 more elements
Dependencies are inferred from the claim text.