US4645964A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vibration wave motor
Assignee: Canon Inc
•
Filing: 1985-03-28
•
Granted: 1987-02-24
•
Expires: 2005-03-28
Abstract
Abstract A motor which drives a movable member by a travelling vibration wave generated in a vibration member having electrostrictive elements arranged with a phase difference therebetween is disclosed. The electrostrictive elements are stacked in a lamination direction with the phase difference therebetween so that a contact area between the electrostrictive elements and the vibration member is increased and a high output and high efficiency drive is attained.
Inventors
- 👤 Akira Hiramatsu
- 👤 Hitoshi Mukohjima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 07:13
CPC Classifications
H; H02; H02N; H02N2/00; H02N2/10; H02N2/16; H02N2/163
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
125 words
A vibration wave motor comprising: (a) a ring-shaped vibration member having an outer peripheral portion of a first thickness and an inner peripheral portion of a second thickness, said vibration member having electrostrictive means provided on a first surface of said inner peripheral portion and on a second surface of said inner peripheral portion which is opposite to said first surface; (b) means for applying periodic signals having different phases respectively to said electrostrictive means provided on said first and second surfaces so that a travelling vibration wave is generated on a surface of said outer peripheral portion; and (c) a movable member contacting said surface of said outer peripheral portion in said vibration member, said movable member being rotated by the travelling vibration wave.
Claim 2
Dependent Claim
125 words
A vibration wave motor comprising: (a) a ring-shaped vibration member having an outer peripheral portion of a first thickness and an inner peripheral portion of a second thickness, said vibration member having electrostrictive means provided on a first surface of said inner peripheral portion and on a second surface of said inner peripheral portion which is opposite to said first surface; (b) means for applying periodic signals having different phases respectively to said electrostrictive means provided on said first and second surfaces so that a travelling vibration wave is generated on a surface of said outer peripheral portion; and (c) a movable member contacting said surface of said outer peripheral portion in said vibration member, said movable member being rotated by the travelling vibration wave.
Claim 3
Dependent Claim
29 words
A vibration wave motor according to claim 1, wherein each of said electrostrictive means is arranged at a pitch of a predetermined fraction of wavelength of a vibration wave.
Claim 4
Dependent Claim
18 words
A vibration wave motor according to claim 1, wherein said electrostrictive means comprises at least one piezoelectric element.
Claim 5
Dependent Claim
25 words
A vibration wave motor according to claim 1, wherein the thickness of said inner peripheral portion is smaller than that of said outer peripheral portion.
Claim 6
Dependent Claim
169 words
A vibration wave motor comprising: (a) a ring-shaped vibration member having an outer peripheral portion of a first thickness and an inner peripheral portion of a second thickness, said vibration member having an electrostricture means on a first surface of said inner peripheral portion and on a second surface of said inner peripheral portion which is opposite to said first surface; (b) means for applying periodic signals having different phases respectively to said electrostrictive means, provided on said first and second surfaces so that a travelling vibration wave is generated on a surface of said outer peripheral portion; (c) a movable member contacting said surface of said outer peripheral portion in said vibration member, said movable member being rotated by said travelling vibration wave; and (d) a motor case member, said vibration member and said movable member being provided within said motor case member, said vibration member and said motor case member being fixed to each other with a support member which is less rigid than said vibration member.
Claim 7
Dependent Claim
169 words
A vibration wave motor comprising: (a) a ring-shaped vibration member having an outer peripheral portion of a first thickness and an inner peripheral portion of a second thickness, said vibration member having an electrostricture means on a first surface of said inner peripheral portion and on a second surface of said inner peripheral portion which is opposite to said first surface; (b) means for applying periodic signals having different phases respectively to said electrostrictive means, provided on said first and second surfaces so that a travelling vibration wave is generated on a surface of said outer peripheral portion; (c) a movable member contacting said surface of said outer peripheral portion in said vibration member, said movable member being rotated by said travelling vibration wave; and (d) a motor case member, said vibration member and said movable member being provided within said motor case member, said vibration member and said motor case member being fixed to each other with a support member which is less rigid than said vibration member.
Claim 8
Dependent Claim
29 words
A vibration wave motor according to claim 5, wherein each of said electrostrictive means is arranged at a pitch of a predetermined fraction of wavelength of a vibration wave.
Claim 9
Dependent Claim
18 words
A vibration wave motor according to claim 5, wherein said electrostrictive means comprises at least one piezoelectric element.
Claim 10
Dependent Claim
25 words
A vibration wave motor according to claim 5, wherein the thickness of said inner peripheral portion is less than that of said outer peripheral portion.
Claim 11
Dependent Claim
129 words
A vibration wave motor comprising: (a) a ring-shaped vibration member on which electrostrictive means are laminated in first and second surfaces of the vibration member; (b) means for applying periodic signals, having different respectively to said electrostrictive means provided on said first and second surfaces so that a travelling vibration wave is generated on a surface of an outer peripheral portion of said vibration member; (c) a movable member contacting said vibration member, said movable member being rotated by said travelling vibration wave; and (d) a hollow motor case member, said vibration member and said movable member being provided within the motor case member, said vibration member and said motor case member being fixed to each other with a support member which is less rigid than said vibration member.
Claim 12
Dependent Claim
129 words
A vibration wave motor comprising: (a) a ring-shaped vibration member on which electrostrictive means are laminated in first and second surfaces of the vibration member; (b) means for applying periodic signals, having different respectively to said electrostrictive means provided on said first and second surfaces so that a travelling vibration wave is generated on a surface of an outer peripheral portion of said vibration member; (c) a movable member contacting said vibration member, said movable member being rotated by said travelling vibration wave; and (d) a hollow motor case member, said vibration member and said movable member being provided within the motor case member, said vibration member and said motor case member being fixed to each other with a support member which is less rigid than said vibration member.
Claim 13
Dependent Claim
18 words
A vibration wave motor according to claim 9, wherein said electrostrictive means comprises at least one piezoelectric element.
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) | 1990-02-23 | 1990-08-25 | 1991-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-02-23 | 1994-08-25 | 1995-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-02-23 | 1998-08-25 | 1999-02-24 | $7700.00 | Window Closed / Lapsed |