US4742260A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Piezoelectrically driving device
Assignee: HIROSHI SHIMIZU A CORP OF JAPAN
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Filing: 1987-01-28
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Granted: 1988-05-03
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Expires: 2007-01-28
Abstract
Abstract A piezoelectrically driving device comprises a driving part including paired opposing pole parts substantially square shaped in section, piezoelectric elements provided at least to two adjacent faces of each of the opposing pole parts for causing them to flectionally vibrate resonantly in response to an applied high frequency voltage, and a contact member contactable with one face of each of the opposing pole parts for movement relative thereto or vice versa due to the vibration, any energy loss upon which movement is thereby remarkable restrained and a mechanical driving force can be obtained highly efficiently.
Inventors
- 👤 Hiroshi Shimizu
- 👤 Sumio Sugawara
- 👤 Takashi Takada
- 👤 Seiki Ishibashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:55
CPC Classifications
H; H02; H02N; H02N2/00; H02N2/0005; H02N2/001; H02N2/0015; H02N2/02; H02N2/026; H02N2/10; H02N2/103; H01; H01H; H01H57/00
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
180 words
A piezoelectrically driving device comprising a vibrator including a base part and a driving part of a flexible material and contacting with a contact member for causing therebetween a relative movement, and a power supply unit for providing a high frequency voltage to said vibrator, wherein said driving part comprises at least one pair of pole parts, each pole part being substantially square shaped in section, joined at one end to the base part of the vibrator and contacting said contact member at one side face, the pair of pole parts being disposed mutually in parallel, and piezoelectric elements disposed on at least two adjacent faces of each of said pair of pole parts, the piezoelectric elements causing said pole parts to resonantly vibrate upon application of said high frequency voltage from said power supply unit to said piezoelectric elements, said high frequency voltage being applied to the piezoelectric elements sequentially with a predetermined phase difference, the pole parts vibrating with a mutual phase difference corresponding to the predetermined phase difference, whereby the pole parts alternately contact the contact member.
Claim 2
Dependent Claim
180 words
A piezoelectrically driving device comprising a vibrator including a base part and a driving part of a flexible material and contacting with a contact member for causing therebetween a relative movement, and a power supply unit for providing a high frequency voltage to said vibrator, wherein said driving part comprises at least one pair of pole parts, each pole part being substantially square shaped in section, joined at one end to the base part of the vibrator and contacting said contact member at one side face, the pair of pole parts being disposed mutually in parallel, and piezoelectric elements disposed on at least two adjacent faces of each of said pair of pole parts, the piezoelectric elements causing said pole parts to resonantly vibrate upon application of said high frequency voltage from said power supply unit to said piezoelectric elements, said high frequency voltage being applied to the piezoelectric elements sequentially with a predetermined phase difference, the pole parts vibrating with a mutual phase difference corresponding to the predetermined phase difference, whereby the pole parts alternately contact the contact member.
Claim 3
Dependent Claim
20 words
A device according to claim 1, wherein said piezoelectric elements are bonded onto said adjacent faces of said pole parts.
Claim 4
Dependent Claim
27 words
A device according to claim 1, wherein said vibrator is made of a piezoelectric ceramic material and said piezoelectric elements are formed directly in said pole parts.
Claim 5
Dependent Claim
12 words
A device according to claim 1, which comprises two of said vibrators.
Claim 6
Dependent Claim
37 words
A device according to claim 4, wherein said two vibrators are disposed as stacked on each other for interposing said contact member between them, said contact member being contactable with said pole parts of said two vibrators.
Claim 7
Dependent Claim
43 words
A device according to claim 4, wherein said two vibrators are U-shaped and longitudinally joined to each other to form a substantially H-shaped integral vibrator having two pairs of said pole parts, said contact member contacting with said two pairs of pole parts.
Claim 8
Dependent Claim
39 words
A device according to claim 1, wherein said contact member is of a flat plate shape, and said relative movement between said vibrator and said contact member is linear in a longitudinal direction of said plate shaped contact member.
Claim 9
Dependent Claim
30 words
A device according to claim 1, wherein said contact member is of a disc shape, and said relative movement between said vibrator and said contact member is a rotary motion.
Claim 10
Dependent Claim
36 words
A device according to claim 1, wherein said contact member is of a rod shape and positioned between said pole parts, and said relative movement between said vibrator and said contact member is a rotary motion.
Claim 11
Dependent Claim
30 words
A device according to claim 1, wherein said contact member is of a ring shape, and said relative movement between said vibrator and said contact member is a rotary motion.
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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) | 1991-05-03 | 1991-11-02 | 1992-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-05-03 | 1995-11-02 | 1996-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-05-03 | 1999-11-02 | 2000-05-03 | $7700.00 | Window Closed / Lapsed |