DRIVE APPARATUS OF VIBRATION-TYPE ACTUATOR, INTERCHANGEABLE LENS, AND IMAGE PICKUP APPARATUS USING THE SAME
First Claim
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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.
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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.
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Citations
20 Claims
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1. A drive apparatus of a vibration-type actuator comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A drive apparatus of a vibration-type actuator comprising:
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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. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification