Patent US5266862A successfully refreshed from Google Patents.
US5266862A
Expired / Lapsed
US
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Piezoelectric actuator
Assignee: NEC Corp
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Filing: 1991-10-23
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Granted: 1993-11-30
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Expires: 2011-10-23
Abstract
Abstract In order to make uniform and smooth elongation of a piezoelectric actuator at the end faces thereof, at least one piezoelectric active layer with at least one non-conductive area formed at the central portion thereof is arranged between an inactive layer and an extreme piezoelectric active layer of the element.
Inventors
- 👤 Kazumasa Ohya
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 09:33
CPC Classifications
H; H10; H10N; H10N30/00; H10N30/80; H10N30/87; H10N30/871
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
86 words
A piezoelectric actuator comprising: first piezoelectric active layers including an alternate lamination of electrostrictive ceramic materials and internal electrodes; a pair of inactive layers respectively disposed at the opposite ends of said piezoelectric actuator in the direction of lamination; and at least one second piezoelectric active layer sandwiched between an end of each inactive layer of said pair of inactive layers and an end of said first piezoelectric active layers, each said second piezoelectric active layer including a non-conductive area formed thereon at the central portion.
Claim 2
Dependent Claim
86 words
A piezoelectric actuator comprising: first piezoelectric active layers including an alternate lamination of electrostrictive ceramic materials and internal electrodes; a pair of inactive layers respectively disposed at the opposite ends of said piezoelectric actuator in the direction of lamination; and at least one second piezoelectric active layer sandwiched between an end of each inactive layer of said pair of inactive layers and an end of said first piezoelectric active layers, each said second piezoelectric active layer including a non-conductive area formed thereon at the central portion.
Claim 3
Dependent Claim
28 words
A piezoelectric actuator according to claim 1, wherein the non-conductive area of said at least one second piezoelectric active layer is of a circular, elliptic or polygonal configuration.
Claim 4
Dependent Claim
22 words
A piezoelectric actuator according to claim 1, wherein each said second piezoelectric active layer has a non-conductive area of the same configuration.
Claim 5
Dependent Claim
35 words
A piezoelectric actuator according to claim 1, wherein the non-conductive area of each said second piezoelectric active layer has a smaller size as the second piezoelectric active layer is located further from an inactive layer.
Claim 6
Dependent Claim
22 words
A piezoelectric actuator according to claim 1, wherein said at least one second piezoelectric active layer includes a plurality of non-conductive areas.
References Cited (Backward Citations)
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US4633120A
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US4759107A
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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) | 1996-11-29 | 1997-05-31 | 1997-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-11-29 | 2001-05-31 | 2001-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-11-29 | 2005-05-31 | 2005-11-30 | $7700.00 | Window Closed / Lapsed |