Vibration wave driving apparatus, and method of setting shape of support member supporting elastic member forming vibration member of vibration wave driving apparatus
First Claim
1. A vibration wave driving apparatus comprising:
- a vibration member comprising an electro-mechanical energy conversion element and an elastic member to which the electro-mechanical energy conversion element is fixed; and
a contact member pressed against the vibration member so as to be kept in contact therewith, wherein alternating signals in a predetermined driving frequency band are supplied to the electro-mechanical energy conversion element whereby the vibration member generates a driving vibration for moving the contact member and wherein a natural frequency of another vibration different from the driving vibration is not included in the driving frequency band.
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Abstract
The invention relates to a vibration wave driving apparatus which comprises a vibration member in which an electro-mechanical energy conversion element is fixed to the elastic member, and a contact member pressed against a sliding part provided in the vibration member, so as to be kept in contact therewith, and which is configured to supply alternating signals in a predetermined driving frequency band to the electro-mechanical energy conversion element, thereby generating a predetermined natural vibration mode in the elastic member to drive the contact member. In the apparatus, the natural vibration mode is generated in the elastic member, a natural frequency of another vibration mode different from the natural vibration mode is detected, and a stiffness of the support member is altered if the natural frequency of the other vibration mode detected is included in the driving frequency band.
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Citations
22 Claims
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1. A vibration wave driving apparatus comprising:
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a vibration member comprising an electro-mechanical energy conversion element and an elastic member to which the electro-mechanical energy conversion element is fixed; and
a contact member pressed against the vibration member so as to be kept in contact therewith, wherein alternating signals in a predetermined driving frequency band are supplied to the electro-mechanical energy conversion element whereby the vibration member generates a driving vibration for moving the contact member and wherein a natural frequency of another vibration different from the driving vibration is not included in the driving frequency band. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A vibration wave driving apparatus which comprises a vibration member comprising an elastic member to which an electro-mechanical energy conversion element is joined, and a contact member kept in contact with the elastic member, and in which alternating signals in a predetermined driving frequency band are supplied to the electro-mechanical energy conversion element of the vibration member, thereby generating a driving vibration in the elastic member to drive the contact member, the vibration wave driving apparatus comprising:
frequency adjusting means which supports the elastic member so that a natural frequency of a mode of generating another vibration different from the driving vibration in the vibration member is not included in the driving frequency band. - View Dependent Claims (11, 12, 13, 14)
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15. A method of setting a shape of a support member fixed to an elastic member and supporting the elastic member, in a vibration wave driving apparatus which comprises a vibration member in which an electro-mechanical energy conversion element is fixed to the elastic member, and a contact member pressed against a sliding part provided in the vibration member, so as to be kept in contact therewith, and which is configured to supply alternating signals in a predetermined driving frequency band to the electro-mechanical energy conversion element, thereby generating a predetermined natural vibration mode in the elastic member to drive the contact member, said method comprising:
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a step of generating the natural vibration mode in the elastic member and detecting a natural frequency of another vibration mode different from the natural vibration mode; and
a step of altering a stiffness of the support member if the natural frequency of the other vibration mode is included in the driving frequency band. - View Dependent Claims (16, 17, 18, 19)
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20. A method of setting a shape of a support member fixed to an elastic member and supporting the elastic member, in a vibration wave driving apparatus which comprises a vibration member in which an electro-mechanical energy conversion element is fixed to the elastic member, and a contact member pressed against a sliding part provided in the vibration member, so as to be kept in contact therewith, and which is configured to supply alternating signals in a predetermined driving frequency band to the electro-mechanical energy conversion element, thereby generating a predetermined natural vibration mode in the elastic member to drive the contact member, said method comprising:
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a step of generating the natural vibration mode in the elastic member and detecting a natural frequency of another vibration mode different from the natural vibration mode; and
a step of altering a fixing position between the support member and the elastic member if the natural frequency of the other vibration mode is included in the driving frequency band. - View Dependent Claims (21, 22)
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Specification