Driving circuit for vibration-type actuator
First Claim
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1. An apparatus comprising:
- a vibration-type actuator comprising a vibration member and a moving member, wherein the vibration member includes an electro-mechanical energy conversion element and the moving member is configured to move relative to the vibration member; and
a driving circuit comprising a capacitor and an inductor connected in series with the capacitor to the electro-mechanical energy conversion element,wherein parameters of the driving circuit are set such that, when a series resonance frequency of the inductor and the capacitor is denoted by fs and a resonance frequency of the vibration member is denoted by fm, a condition 0.73·
fm<
fs<
1.2·
fm is satisfied.
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Abstract
An apparatus includes a vibration-type actuator and a driving circuit. The vibration-type actuator includes a vibration member and a moving member, wherein the vibration member includes an electro-mechanical energy conversion element and the moving member is configured to move relative to the vibration member. The driving circuit includes a capacitor and an inductor connected in series with the capacitor to the electro-mechanical energy conversion element. In an example, parameters of the driving circuit are set such that, when a series resonance frequency of the inductor and the capacitor is denoted by fs and a resonance frequency of the vibration member is denoted by fm, a condition 0.73·fm<fs<1.2·fm is satisfied.
19 Citations
20 Claims
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1. An apparatus comprising:
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a vibration-type actuator comprising a vibration member and a moving member, wherein the vibration member includes an electro-mechanical energy conversion element and the moving member is configured to move relative to the vibration member; and a driving circuit comprising a capacitor and an inductor connected in series with the capacitor to the electro-mechanical energy conversion element, wherein parameters of the driving circuit are set such that, when a series resonance frequency of the inductor and the capacitor is denoted by fs and a resonance frequency of the vibration member is denoted by fm, a condition 0.73·
fm<
fs<
1.2·
fm is satisfied. - View Dependent Claims (2, 3, 4)
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5. An apparatus comprising:
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a vibration-type actuator comprising a vibration member and a moving member, wherein the vibration member includes an electro-mechanical energy conversion element and the moving member is configured to move relative to the vibration member; and a driving circuit comprising a transformer, an inductor, and a capacitor, wherein the transformer includes a primary coil and a secondary coil and is connected in parallel to the electro-mechanical energy conversion element, wherein an alternating voltage is configured to be applied to the primary coil, and wherein the inductor and the capacitor are located at least one of on a primary side and a secondary side of the transformer such that the inductor and the capacitor are connected in series to the electro-mechanical energy conversion element, wherein parameters of the driving circuit are set such that, when a series resonance frequency of the inductor and the capacitor is denoted by fs and a resonance frequency of the vibration member is denoted by fm, a condition 0.73·
fm<
fs<
1.2·
fm is satisfied. - View Dependent Claims (6, 7, 8, 9)
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10. An apparatus comprising:
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a vibration member including an electro-mechanical energy conversion element; and a driving circuit comprising a capacitor and an inductor connected in series with the capacitor to the electro-mechanical energy conversion element, wherein parameters of the driving circuit are set such that, when a series resonance frequency of the inductor and the capacitor is denoted by fs and a resonance frequency of the vibration member is denoted by fm, a condition 0.73·
fm<
fs<
1.2·
fm is satisfied. - View Dependent Claims (11, 12, 13, 14)
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15. An apparatus comprising:
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a vibration member including an electro-mechanical energy conversion element; and a driving circuit comprising a transformer, an inductor, and a capacitor, wherein the transformer includes a primary coil and a secondary coil and is connected in parallel to the electro-mechanical energy conversion element, wherein an alternating voltage is configured to be applied to the primary coil, and wherein the inductor and the capacitor are located at least one of on a primary side and a secondary side of the transformer such that the inductor and the capacitor are connected in series to the electro-mechanical energy conversion element, wherein parameters of the driving circuit are set such that, when a series resonance frequency of the inductor and the capacitor is denoted by fs and a resonance frequency of the vibration member is denoted by fm, a condition 0.73·
fm<
fs<
1.2·
fm is satisfied. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification
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Current AssigneeCanon Kabushiki Kaisha (Canon Inc.)
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Original AssigneeCanon Kabushiki Kaisha (Canon Inc.)
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InventorsSumioka, Jun, Kataoka, Kenichi
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Primary Examiner(s)DOUGHERTY, THOMAS M
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Application NumberUS14/017,089Publication NumberTime in Patent Office329 DaysField of Search31031601-31603, 310317-319US Class Current310/317CPC Class CodesH02N 2/008 Means for controlling vibra...H02N 2/142 Small signal circuits; Mean...
