US4739212A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ultrasonic motor
Assignee: Panasonic Holdings Corp
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Filing: 1986-07-17
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Granted: 1988-04-19
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Expires: 2006-07-17
Abstract
Abstract A contacting member of a composite material of organic fiber and resin is provided to an inner surface of either a rotor or a stator of an ultrasonic motor. Noise is suppressed, starting torque is better and wear is decreased.
Inventors
- 👤 Yoshinobu Imasaka
- 👤 Hiroshi Yoneno
- 👤 Masanori Sumihara
- 👤 Akira Tokushima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:23
CPC Classifications
H; H02; H02N; H02N2/00; H02N2/10; H02N2/16; H02N2/166; H02N2/0005; H02N2/005; H02N2/0065; H02N2/007; H02N2/163
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
69 words
An ultrasonic motor compromising: a stator provided with a piezoelectric element, said piezoelectric element being for vibrating said stator by travelling waves of ultrasonic frequency, a rotor, configured to be rotated by contacting said stator, and a contact member of composite material provided on an inner surface of one of: (a) said stator or (b) said rotor, the contact member being a composite material of organic fiber and resin.
Claim 2
Dependent Claim
69 words
An ultrasonic motor compromising: a stator provided with a piezoelectric element, said piezoelectric element being for vibrating said stator by travelling waves of ultrasonic frequency, a rotor, configured to be rotated by contacting said stator, and a contact member of composite material provided on an inner surface of one of: (a) said stator or (b) said rotor, the contact member being a composite material of organic fiber and resin.
Claim 3
Dependent Claim
18 words
An ultrasonic motor in accordance with claim 1, wherein said organic fiber is of a discontinuous filament type.
Claim 4
Dependent Claim
37 words
An ultrasonic motor in accordance with claim 2, wherein said organic fiber is of an aromatic polyamide fiber and scattered in said resin, and said organic fiber is 2-70 volume % of said member of composite material.
Claim 5
Dependent Claim
17 words
An ultrasonic motor in accordance with claim 1, wherein said organic fiber is of a felt type.
Claim 6
Dependent Claim
27 words
An ultrasonic motor in accordance with claim 4, wherein said organic fiber is selected from a group consisting of aromatic polyamide fiber, phenol fiber and polyester fiber.
Claim 7
Dependent Claim
17 words
An ultrasonic motor in accordance with claim 1, wherein said organic fiber is of a cloth type.
Claim 8
Dependent Claim
18 words
A motor as in claim 1 wherein said contact member is pressure contacted to said rotor or stator.
References Cited (Backward Citations)
US4562373A
Cited
US4634916A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-04-19 | 1991-10-19 | 1992-04-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-04-19 | 1995-10-19 | 1996-04-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-04-19 | 1999-10-19 | 2000-04-19 | $7700.00 | Window Closed / Lapsed |