US4727276A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Driving circuit for vibration wave motor
Assignee: Canon Inc
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Filing: 1986-03-25
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Granted: 1988-02-23
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Expires: 2006-03-25
Abstract
Abstract A driving circuit for a vibration wave motor, in which a periodic voltage is supplied to electromechanical energy converting elements generates a travelling vibration wave in a vibrating member, thus causing a relative movement between the vibrating member and a movable member. For achieving effective operation of the vibration wave motor, the driving circuit controls the amplitude of the periodic voltage supplied to the electromechanical converting elements according to the drive state of the vibration wave motor.
Inventors
- 👤 Kazuhiro Izukawa
- 👤 Kho Ishizuka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:31
CPC Classifications
H; H02; H02N; H02N2/00; H02N2/10; H02N2/14; H02N2/142; H02N2/16; H02N2/163
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
124 words
A driving circuit for a vibration wave motor in which periodic signals are supplied to electromechanical energy converting elements to generate a travelling wave on a vibrating member thereby driving a movable member by means of said travelling wave, comprising: (a) first detection means for detecting the vibration on said vibrating member; (b) periodic signal regulating means for forming said periodic signals in the form of sinusoidal waves of a determined frequency according to an output signal of said first detection means; (c) second detection means for detecting distortion in case said sinusoidal waves are distorted; and (d) a distortion preventing circuit for correcting said distortion and supplying sinusoidal waves to said converting elements in response to an output of said second detection means.
Claim 2
Dependent Claim
124 words
A driving circuit for a vibration wave motor in which periodic signals are supplied to electromechanical energy converting elements to generate a travelling wave on a vibrating member thereby driving a movable member by means of said travelling wave, comprising: (a) first detection means for detecting the vibration on said vibrating member; (b) periodic signal regulating means for forming said periodic signals in the form of sinusoidal waves of a determined frequency according to an output signal of said first detection means; (c) second detection means for detecting distortion in case said sinusoidal waves are distorted; and (d) a distortion preventing circuit for correcting said distortion and supplying sinusoidal waves to said converting elements in response to an output of said second detection means.
Claim 3
Dependent Claim
101 words
A driving circuit for a vibration wave motor in which AC signals are supplied to electromechanical energy converting elements to generate a travelling wave on a vibrating member thereby driving a movable member by means of said travelling wave, comprising: (a) periodic signal generating means for generating said periodic signals; (b) detection means for detecting the distortion in said periodic signals after the lapse of a determined period from the start of driving; and (c) adjusting means for adjusting the output of the AC signals from said periodic signal generating means in response to an output signal from said detection means.
Claim 4
Dependent Claim
101 words
A driving circuit for a vibration wave motor in which AC signals are supplied to electromechanical energy converting elements to generate a travelling wave on a vibrating member thereby driving a movable member by means of said travelling wave, comprising: (a) periodic signal generating means for generating said periodic signals; (b) detection means for detecting the distortion in said periodic signals after the lapse of a determined period from the start of driving; and (c) adjusting means for adjusting the output of the AC signals from said periodic signal generating means in response to an output signal from said detection means.
Claim 5
Dependent Claim
14 words
A driving circuit according to claim 2, wherein said periodic signals are sinusoidal signals.
Claim 6
Dependent Claim
56 words
A driving circuit according to claim 2 or 3, wherein said detection means is adapted to detect a distortion in said sinusoidal signals, and said adjusting means is adapted to supply a correction signal to said periodic signal generating means to obtain sinusoidal periodic signals, when said detection means detects a distortion in the sinusoidal signals.
References Cited (Backward Citations)
US4484099A
Cited
US4510411A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-02-22 | 1991-08-24 | 1992-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-02-22 | 1995-08-24 | 1996-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-02-22 | 1999-08-24 | 2000-02-23 | $7700.00 | Window Closed / Lapsed |