Vibration-type driving device, control apparatus for controlling the driving of the vibration-type driving device, and electronic equipment having the vibration-type driving device and the control apparatus
First Claim
1. A control apparatus comprising:
- a vibration-type driving device further comprisinga vibration element including an elastic body and an electro-mechanical energy conversion element having at least two electrodes and arranged to cause said elastic body to excite vibrations with two driving voltages of respective phases having the same frequency applied to the two electrodes;
a driven element that is kept in contact with said elastic body,wherein said vibration element is capable of forming a first flexural vibration mode in response to inputting of the two driving voltages of respective phases that are made the same into the two electrodes and is capable of forming a second flexural vibration mode in response to inputting of the two driving voltages of respective phases that are made opposite to each other into the two electrodes; and
a signal generation circuit configured to apply two driving voltages with different phases to the two electrodes, so that the first flexural vibration mode and the second flexural vibration mode are simultaneously formed to generate combined vibration and the combined vibration drives said driven element.
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Accused Products
Abstract
A vibration-type driving device comprises a vibration element including a driving member and an electro-mechanical energy conversion element having an electrode and arranged to displace the driving member with a driving signal supplied to the electrode, and a driven element that is kept in contact with the driving member of the vibration element. According to the driving signal supplied to the electrode of the electro-mechanical energy conversion element, the vibration element excites vibrations in two flexural vibration modes in which a direction of generation of a node in one mode is perpendicular to that in the other mode. With the use of the two flexural vibration modes, the natural vibration frequency of the vibration element can be prevented from increasing, and the position of a node occurring in one flexural vibration mode and the position of an antinode occurring in the other flexural vibration mode can be made to coincide with each other, so that the amount of displacement of the driving member can be made large.
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Citations
10 Claims
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1. A control apparatus comprising:
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a vibration-type driving device further comprising a vibration element including an elastic body and an electro-mechanical energy conversion element having at least two electrodes and arranged to cause said elastic body to excite vibrations with two driving voltages of respective phases having the same frequency applied to the two electrodes; a driven element that is kept in contact with said elastic body, wherein said vibration element is capable of forming a first flexural vibration mode in response to inputting of the two driving voltages of respective phases that are made the same into the two electrodes and is capable of forming a second flexural vibration mode in response to inputting of the two driving voltages of respective phases that are made opposite to each other into the two electrodes; and a signal generation circuit configured to apply two driving voltages with different phases to the two electrodes, so that the first flexural vibration mode and the second flexural vibration mode are simultaneously formed to generate combined vibration and the combined vibration drives said driven element. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A control apparatus comprising:
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a vibration-type driving device further comprising a vibration element including an elastic body and an electro-mechanical energy conversion etement having at least two electrodes and arranged to cause said elastic body to excite vibrations with two driving voltages of respective phases having the same frequency applied to the two electrodes; a driven etement that is kept in contact with said elastic body, wherein said vibration element is capable of forming a first fiexural vibration mode in response to inputting of the two driving voltages of respective phases having phase difference into the two electrodes and is capable of forming a second flexural vibration mode in response to inputting of the two driving voltages of respective phases having phase difference which differs from the previous phase difference into the two electrodes; and a signal generation circuit configured to apply two driving voltages with different phases to the two electrodes, so that the first flexural vibration mode and the second fiexural vibration mode are simultaneously formed to generate combined vibration and the combined vibration drives said driven element.
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9. A method of controlling driving of a vibration-type driving device including a vibration element including an elastic body and an electro-mechanical energy conversion element having at least two electrodes and arranged to cause the elastic body to excite vibrations with two driving voltages of respective phases having the same frequency applied to the two electrodes, a driven element that is kept in contact with said elastic body, the vibration element being capable of forming a first flexural vibration mode in response to inputting of the two driving voltages of respective phases that are made the same into the two electrodes and being capable of forming a second flexural vibration mode in response to inputting of the two driving voltages of respective phases that are made opposite to each other into the two electrodes, comprising:
applying two driving voltages with different phases to the two electrodes, so that the first flexural vibration mode and the second flexural vibration mode are simultaneously formed to generate combined vibration and the combined vibration drives the driven element.
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10. A method of controlling driving of a vibration-type driving device including a vibration element including a vibration element including an elastic body and an electro-mechanical energy conversion element having at least two electrodes and arranged to cause the elastic body to excite vibrations with two driving voltages of respective phases having the same frequency applied to the two electrodes, a driven element that is kept in contact with the elastic body, the vibration element being capable of forming a first flexural vibration mode in response to inputting of the two driving voltages of respective phases having phase difference into the two electrodes and being capable of forming a second flexural vibration mode in response to inputting of the two driving voltages of respective phases having phase difference which differs from the previous phase difference into the two electrodes, comprising:
applying two driving voltages with different phases to the two electrodes, so that the first flexural vibration mode and the second flexural vibration mode are simultaneously formed to generate combined vibration and the combined vibration drives the driven element.
Specification