Patent US4926084A successfully refreshed from Google Patents.
US4926084A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Driving apparatus for a vibration wave motor
Assignee: Canon Inc
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Filing: 1989-05-03
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Granted: 1990-05-15
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Expires: 2009-05-03
Abstract
Abstract Disclosed is a driving apparatus for a vibration wave motor in which monitor means is provided for detecting the vibrating state of the vibration wave motor and the difference between the resonance frequency and the frequency of a driving AC signal is detected on the basis of the phase difference between the output signal from the monitor means and the driving AC signal and when the frequency difference is great during the change of the number of revolutions of the motor, the vibration rate of the frequency of the driving AC signal is made greater to improve the responsiveness while, on the other hand, when the frequency difference is small, the variation rate of the frequency of the driving AC signal is made smaller to thereby prevent the occurrence of an unstable operation in which the frequency of the driving AC signal exceeds the resonance frequency to cause sudden stoppage of the motor.
Inventors
- 👤 Etsuro Furutsu
- 👤 Kazuhiro Izukawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:00
CPC Classifications
H; H02; H02N; H02N2/00; H02N2/10; H02N2/14; H02N2/142
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
141 words
A vibration wave driven motor comprising: (a) a first member having a friction surface; (b) a vibration member arranged in contact with the friction surface of said first member; (c) an electro-mechanical transducer arranged in contact with said vibration member to generate the travelling vibration wave to said vibration member in response to an applied driving signal with a predetermined frequency; (d) monitoring means for monitoring the vibrating state of said motor and outputting a signal conforming to the amount of deviation from the resonancevibrating state; and (e) frequency changing means responsive to the output signal from said monitoring means to change the frequency of the driving signal greatly when said amount of deviation is greater than a predetermined value, and to change the frequency of the driving signal small when said amount of deviation is smaller than said predetermined value.
Claim 2
Dependent Claim
141 words
A vibration wave driven motor comprising: (a) a first member having a friction surface; (b) a vibration member arranged in contact with the friction surface of said first member; (c) an electro-mechanical transducer arranged in contact with said vibration member to generate the travelling vibration wave to said vibration member in response to an applied driving signal with a predetermined frequency; (d) monitoring means for monitoring the vibrating state of said motor and outputting a signal conforming to the amount of deviation from the resonancevibrating state; and (e) frequency changing means responsive to the output signal from said monitoring means to change the frequency of the driving signal greatly when said amount of deviation is greater than a predetermined value, and to change the frequency of the driving signal small when said amount of deviation is smaller than said predetermined value.
Claim 3
Dependent Claim
22 words
A motor according to claim 1, wherein said monitoring means includes a vibration detecting sensor arranged in contact with the vibration member.
Claim 4
Dependent Claim
29 words
A motor according to claim 2, wherein said monitoring means outputs a signal conforming to the phase difference between the output signal from the sensor and the driving signal.
Claim 5
Dependent Claim
33 words
A motor according to claim 2, wherein said monitoring means includes a phase comparator outputting a signal conforming to the phase difference between the output singal from the sensor and the driving signal.
Claim 6
Dependent Claim
149 words
A vibration wave driven motor comprising: (a) a first member having a friction surface; (b) a vibration member arranged in contact with the friction surface of said first member; (c) an electro-mechanical transducer arranged in contact with said vibration member to generate the travelling vibration wave to said vibration member in response to an applied driving signal with a predetermined frequency; (d) detecting means for detecting the vibrating state of said motor and generating an output signal conforming to the phase difference between the frequency of the driving signal and the resonance frequency of the motor; and (e) frequency changing means responsive to the output signal from the detecting means to change the frequency of the driving signal greatly when said phase difference is greater than a predetermined value, and to change the frequency of the driving signal small when said phase difference is smaller than said predetermined value.
Claim 7
Dependent Claim
149 words
A vibration wave driven motor comprising: (a) a first member having a friction surface; (b) a vibration member arranged in contact with the friction surface of said first member; (c) an electro-mechanical transducer arranged in contact with said vibration member to generate the travelling vibration wave to said vibration member in response to an applied driving signal with a predetermined frequency; (d) detecting means for detecting the vibrating state of said motor and generating an output signal conforming to the phase difference between the frequency of the driving signal and the resonance frequency of the motor; and (e) frequency changing means responsive to the output signal from the detecting means to change the frequency of the driving signal greatly when said phase difference is greater than a predetermined value, and to change the frequency of the driving signal small when said phase difference is smaller than said predetermined value.
Claim 8
Dependent Claim
22 words
A motor according to claim 5, wherein said monitoring means includes a vibration detecting sensor arranged in contact with the vibration member.
Claim 9
Dependent Claim
156 words
A driving circuit for a vibration wave driven body in which a travelling vibration wave is generated in a vibration member having at least a pair of electro-mechanical energy converting elements arranged or polarized in the fashion of a phase difference by applying a periodic signal to said electro-mechanical energy converting elements and said vibration member and a contact member are moved relative to each other by said travelling vibration wave, said driving circuit comprising: (a) monitoring means for monitoring the vibrating state of said driven body and outputting a signal conforming to the amount of deviation from the resonance-vibrating state; and (b) frequency changing means responsive to the output signal from said monitoring means to change the frequency of the periodic signal greatly when said amount of deviation is greater than a predetermined value, and to change the frequency of the periodic signal small when said amount of deviation is smaller than said predetermined value.
Claim 10
Dependent Claim
156 words
A driving circuit for a vibration wave driven body in which a travelling vibration wave is generated in a vibration member having at least a pair of electro-mechanical energy converting elements arranged or polarized in the fashion of a phase difference by applying a periodic signal to said electro-mechanical energy converting elements and said vibration member and a contact member are moved relative to each other by said travelling vibration wave, said driving circuit comprising: (a) monitoring means for monitoring the vibrating state of said driven body and outputting a signal conforming to the amount of deviation from the resonance-vibrating state; and (b) frequency changing means responsive to the output signal from said monitoring means to change the frequency of the periodic signal greatly when said amount of deviation is greater than a predetermined value, and to change the frequency of the periodic signal small when said amount of deviation is smaller than said predetermined value.
Claim 11
Dependent Claim
163 words
A driving circuit for a vibration wave driven body in which a travelling vibration wave is generated in a vibration member having at least a pair of electro-mechanical energy converting elements arranged or polarized in the fashion of a phase difference by applying a periodic signal to said electro-mechanical energy converting elements and said vibration member and a contact member are moved relative to each other by said travelling vibration wave, said driving circuit comprising: (a) detecting means for detecting the vibrating state of said body and generating an output signal conforming to the phase difference between the frequency of the periodic signal and the resonance frequency of the body; and (b) freuqency changing means responsive to the output signal from the detecting means to change the frequency of the periodic signal greatly when said phase difference is greater than a predetermined value, and to change the frequency of the periodic signal small when said phase difference is smaller than said predetermined value.
Claim 12
Dependent Claim
163 words
A driving circuit for a vibration wave driven body in which a travelling vibration wave is generated in a vibration member having at least a pair of electro-mechanical energy converting elements arranged or polarized in the fashion of a phase difference by applying a periodic signal to said electro-mechanical energy converting elements and said vibration member and a contact member are moved relative to each other by said travelling vibration wave, said driving circuit comprising: (a) detecting means for detecting the vibrating state of said body and generating an output signal conforming to the phase difference between the frequency of the periodic signal and the resonance frequency of the body; and (b) freuqency changing means responsive to the output signal from the detecting means to change the frequency of the periodic signal greatly when said phase difference is greater than a predetermined value, and to change the frequency of the periodic signal small when said phase difference is smaller than said predetermined value.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-05-14 | 1993-11-13 | 1994-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-05-14 | 1997-11-13 | 1998-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-05-14 | 2001-11-13 | 2002-05-15 | $7700.00 | Window Closed / Lapsed |