US4638206A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sheet-like piezoelectric element
Assignee: Niterra Co Ltd
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Filing: 1985-06-14
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Granted: 1987-01-20
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Expires: 2005-06-14
Abstract
Abstract Sheet-like piezoelectric element in which a plurality of slits are formed between the comb-shaped electrodes alternately projected in a zigzag shape from a pair of terminals arranged oppositely, a piezoelectric layer of composite piezoelectric material is filled into the slits, a DC voltage is applied between the terminals to polarize the adjacent layers in reverse directions to each other, and the electrodes have a thickness corresponding to that of the piezoelectric layer. The element may be used for an electro-mechanical transducer or a thermal-electric transducer.
Inventors
- 👤 Tsutomu Tsunooka
- 👤 Tadashi Takeuchi
- 👤 Kunihiro Ushida
- 👤 Shogo Kawajiri
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 13:20
CPC Classifications
G; G01; G01H; G01H11/00; G01H11/06; G01H11/08; H; H04; H04R; H04R17/00; H04R17/005; H10; H10N; H10N30/00; H10N30/20; H10N30/204
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
87 words
A sheet-like piezoelectric element comprising a pair of oppositely arranged terminals, comb-shaped electrodes projecting alternately from respective terminals of said pair of terminals and arranged in a zigzag shape formed with a slit in the lengthwise direction between the adjacent electrodes, and a piezoelectric layer made of composite piezoelectric material filling the slits in such a manner that the adjacent piezoelectric layer portions are polarized in opposite directions to each other, said piezoelectric layer having a thickness which is substantially the same of that of said electrodes.
Claim 2
Dependent Claim
87 words
A sheet-like piezoelectric element comprising a pair of oppositely arranged terminals, comb-shaped electrodes projecting alternately from respective terminals of said pair of terminals and arranged in a zigzag shape formed with a slit in the lengthwise direction between the adjacent electrodes, and a piezoelectric layer made of composite piezoelectric material filling the slits in such a manner that the adjacent piezoelectric layer portions are polarized in opposite directions to each other, said piezoelectric layer having a thickness which is substantially the same of that of said electrodes.
Claim 3
Dependent Claim
29 words
A sheet-like piezoelectric element as claimed in claim 1 wherein the piezoelectric layer comprises a mixture of piezoelectric ceramic powder and molding agent such as resin, rubber or glass.
Claim 4
Dependent Claim
18 words
A sheet-like piezoelectric element as claimed in claim 1 wherein the element is provided on an insulating plate.
Claim 5
Dependent Claim
24 words
A sheet-like piezoelectric element, as claimed in claim 3, wherein said insulating plate is arranged to form a vibrating plate for a bimorph structure.
Claim 6
Dependent Claim
30 words
An electro-mechanical transducer wherein a sheet-like piezoelectric element as claimed in claim 1 is provided on one or both sides of a suitable vibrating member to form a bimorph structure.
Claim 7
Dependent Claim
21 words
An electro-mechanical transducer as claimed in claim 5, wherein said vibrating member is an insulating means for supporting the piezoelectric element.
Claim 8
Dependent Claim
13 words
A thermal-electric transducer including a sheet-like piezoelectric element as claimed in claim 1.
References Cited (Backward Citations)
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Cited
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US2836737A
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US3175107A
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US3114849A
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US3365592A
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US4350916A
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US4407054A
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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) | 1990-01-19 | 1990-07-21 | 1991-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-01-19 | 1994-07-21 | 1995-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-01-19 | 1998-07-21 | 1999-01-20 | $7700.00 | Window Closed / Lapsed |