US4764702A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ultrasonic motor device
Assignee: Taga Electric Co Ltd
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Filing: 1987-03-02
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Granted: 1988-08-16
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Expires: 2007-03-02
Abstract
Abstract An ultrasonic motor having a torsional vibrator a diametrically or longitudinal disk resonator. A diametrically or longitudinal resonator is located at the node of the vibratory member and at right angles thereto. A rotor is disposed opposite to the output of the vibratory member.
Inventors
- 👤 Shoiji Mishiro
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:49
CPC Classifications
H; H02; H02N; H02N2/00; H02N2/0005; H02N2/001; H02N2/0045; H02N2/10; H02N2/106
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
131 words
An ultrasonic motor comprising: a vibrator comprising a torsional vibration member provided with an electrostrictive element for exciting a torsional vibration of said vibrator, a diametrical or longitudinal resonator located at a node portion of said torsional vibration member at right angles to an axis and having a resonance frequency identical with a torsional resonance frequency of said vibrator, and a second electrostrictive element for exciting a longitudinal vibration of said diametrical or longitudinal resonator; a rotor arranged in press contact opposite to an output end of said vibrator; first driving means coupled to said first electrostrictive element for producing a vibration therein; second driving means coupled to said second electrostrictive element for producing a vibration therein; and wherein said first and second driving means generate torsional and longitudinal vibrations, respectively.
Claim 2
Dependent Claim
131 words
An ultrasonic motor comprising: a vibrator comprising a torsional vibration member provided with an electrostrictive element for exciting a torsional vibration of said vibrator, a diametrical or longitudinal resonator located at a node portion of said torsional vibration member at right angles to an axis and having a resonance frequency identical with a torsional resonance frequency of said vibrator, and a second electrostrictive element for exciting a longitudinal vibration of said diametrical or longitudinal resonator; a rotor arranged in press contact opposite to an output end of said vibrator; first driving means coupled to said first electrostrictive element for producing a vibration therein; second driving means coupled to said second electrostrictive element for producing a vibration therein; and wherein said first and second driving means generate torsional and longitudinal vibrations, respectively.
Claim 3
Dependent Claim
49 words
The ultrasonic motor as defined in claim 1, wherein said torsional vibration member, said diametrical or longitudinal resonator and said electrostrictive element for driving said torsional vibration member and said second electrostrictive element for driving said diametrical or longitudinal resonator are assembled as a unit by a center bolt.
Claim 4
Dependent Claim
46 words
The ultrasonic motor as defined in claim 1, wherein said torsional vibration member, said diametrical or longitudinal resonator and said electrostrictive element for driving said torsional vibration member and said second electrostrictive element for driving said diametrical or longitudinal resonator are arranged coaxially with said rotor.
Claim 5
Dependent Claim
18 words
The ultrasonic motor device as defined in claim 1, wherein said diametrical resonator is composed of a disk.
Claim 6
Dependent Claim
19 words
The ultrasonic motor device as defined in claim 1, wherein said diametrical resonator is composed of a rectangular plate.
Claim 7
Dependent Claim
39 words
The ultrasonic motor device as defined in claim 1, wherein the rotational direction or rate of said rotor is changed by controlling the individual amplitudes or the relative phase of the torsional vibration and the diametrical or longitudinal vibration.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-08-16 | 1992-02-15 | 1992-08-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-08-16 | 1996-02-15 | 1996-08-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-08-16 | 2000-02-15 | 2000-08-16 | $7700.00 | Window Closed / Lapsed |