CONTROL APPARATUS OF VIBRATION-TYPE ACTUATOR
First Claim
1. A control apparatus of a vibration-type actuator that rotates, relative to a vibrating member, a moving member that is in contact with a plurality of protrusions of the vibrating member by applying an alternating voltage to an electromechanical energy conversion element of the vibrating member including the electromechanical energy conversion element and by generating elliptic motions in the plurality of protrusions of the vibrating member,wherein information regarding a rotational speed of the moving member is obtained using information regarding a frequency corresponding to the number of the plurality of protrusions, the information regarding the frequency being included in a detection signal from the electromechanical energy conversion element for detecting vibration provided in the vibrating member.
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Accused Products
Abstract
Information regarding a rotational speed is detected by utilizing a variation in the amplitude at a frequency corresponding to the number of a plurality of protrusions of a vibrating member generated in an S-phase signal detected from a vibration detection electrode of a vibration-type actuator.
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Citations
11 Claims
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1. A control apparatus of a vibration-type actuator that rotates, relative to a vibrating member, a moving member that is in contact with a plurality of protrusions of the vibrating member by applying an alternating voltage to an electromechanical energy conversion element of the vibrating member including the electromechanical energy conversion element and by generating elliptic motions in the plurality of protrusions of the vibrating member,
wherein information regarding a rotational speed of the moving member is obtained using information regarding a frequency corresponding to the number of the plurality of protrusions, the information regarding the frequency being included in a detection signal from the electromechanical energy conversion element for detecting vibration provided in the vibrating member.
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10. A control apparatus of a vibration-type actuator that rotates, relative to a plurality of vibrating members, a moving member that is in contact with a plurality of protrusions of the plurality of vibrating members by applying an alternating voltage to an electromechanical energy conversion element of each of the plurality of vibrating members having different numbers of protrusions and by generating elliptic motions in the plurality of protrusions of the plurality of vibrating members,
wherein information regarding an absolute position of the moving member is obtained by detecting a phase difference between signals having frequency components corresponding to the numbers of the plurality of protrusions of the plurality of vibrating members using information regarding frequencies corresponding to the numbers of the plurality of protrusions of the plurality of vibrating members, the information regarding the frequencies being included in detection signals from the electromechanical energy conversion elements for detecting vibration provided in the plurality of vibrating members.
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11. A control apparatus of a vibration-type actuator that rotates, relative to a vibrating member, a moving member that is in contact with a plurality of protrusions of the vibrating member by applying an alternating voltage to an electromechanical energy conversion element of the vibrating member having a region in which the plurality of protrusions that are provided periodically do not exist and by generating elliptic motions in the plurality of protrusions,
wherein information regarding an absolute position of the moving member is obtained using information regarding a frequency corresponding to the number of the plurality of protrusions, the information regarding the frequency being included in a detection signal from the electromechanical energy conversion element for detecting vibration provided in the vibrating member.
Specification