Driving circuit for vibration-type actuator
First Claim
1. A driving circuit configured to drive a vibration member comprising an electro-mechanical energy conversion element, the driving circuit comprising:
- a transformer connected to the electro-mechanical energy conversion element and comprising;
a primary coil configured such that an alternating voltage is applied to the primary coil; and
a secondary coil connected to the electro-mechanical energy conversion element; and
an inductor connected to the primary coil in series,wherein parameters of the driving circuit are set such that, when a frequency of a peak voltage applied to the electro-mechanical energy conversion element is denoted by fe and a driving frequency of the vibration member is denoted by fd, a condition fe<
1.5·
fd is satisfied.
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Abstract
A driving circuit to drive a vibration member comprising an electro-mechanical energy conversion element includes a transformer connected in parallel to the electro-mechanical energy conversion element. The transformer includes a primary coil configured such that an alternating voltage is applied to the primary coil, and a secondary coil connected to the electro-mechanical energy conversion element in parallel, and an inductor connected to the primary coil in series, Parameters of the driving circuit are set such that, when a frequency of a peak voltage applied to the electro-mechanical energy conversion element is denoted by fe and a driving frequency of the vibration member is denoted by fd, a condition fe<1.5·fd is satisfied.
30 Citations
15 Claims
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1. A driving circuit configured to drive a vibration member comprising an electro-mechanical energy conversion element, the driving circuit comprising:
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a transformer connected to the electro-mechanical energy conversion element and comprising; a primary coil configured such that an alternating voltage is applied to the primary coil; and a secondary coil connected to the electro-mechanical energy conversion element; and an inductor connected to the primary coil in series, wherein parameters of the driving circuit are set such that, when a frequency of a peak voltage applied to the electro-mechanical energy conversion element is denoted by fe and a driving frequency of the vibration member is denoted by fd, a condition fe<
1.5·
fd is satisfied. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An apparatus comprising:
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a vibration member including an electro-mechanical energy conversion element; and a driving circuit comprising; a transformer connected to the electro-mechanical energy conversion element and comprising; a primary coil configured such that an alternating voltage is applied to the primary coil; and a secondary coil connected to the electro-mechanical energy conversion element; and an inductor connected to the primary coil in series, wherein parameters of the driving circuit are set such that, when a frequency of a peak voltage applied to the electro-mechanical energy conversion element is denoted by fe and a driving frequency of the vibration member is denoted by fd, a condition fe<
1.5·
fd is satisfied. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
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Specification
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- Resources
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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 NumberUS14/307,367Publication NumberTime in Patent Office707 DaysField of Search31031601-31603, 310317-319US Class Current1/1CPC Class CodesH02N 2/008 Means for controlling vibra...H02N 2/142 Small signal circuits; Mean...
