US3842294A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electromechanical transducer comprising a pair of antiparallel poled rectangular piezoelectric ceramic pieces
Assignee: NEC Corp
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Filing: 1973-11-07
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Granted: 1974-10-15
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Expires: 1993-11-07
Abstract
Abstract A torsional mode electromechanical transducer comprises a pair of rectangular ceramic pieces poled longitudinally and made integral, with a longer side surface of one of the ceramic pieces attached to a similar surface of the other and with the residual polarization directed antiparallel. A mechanical resonator having a planar surface may be used as one or each of the electrodes for exciting the transducer, with the ceramic pieces attached to the planar surface.
Inventors
- 👤 K Doi
- 👤 T Futami
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 14:16
CPC Classifications
H; H03; H03H; H03H9/00; H03H9/02; H03H9/125; H03H9/46; H03H9/48; H03H9/50; H04; H04R; H04R17/00; H04R17/04; H04R17/08
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
106 words
A torsional mode electromechanical transducer including a first substantially rectangular piezoelectric ceramic piece having a pair of principal surfaces and a pair of electrodes attached to said principal surfaces, respectively, wherein the improvement comprises a second substantially rectangular piezoelectric ceramic piece having a pair of principal surfaces and a long side surface attached to one of the long side surfaces of said first ceramic piece, the principal surfaces of said first and second ceramic pieces forming common principal surfaces, said first and second ceramic pieces being poled substantially longitudinally and antiparallel, said electrodes being attached also to the respective principal surfaces of said second ceramic piece.
Claim 2
Dependent Claim
106 words
A torsional mode electromechanical transducer including a first substantially rectangular piezoelectric ceramic piece having a pair of principal surfaces and a pair of electrodes attached to said principal surfaces, respectively, wherein the improvement comprises a second substantially rectangular piezoelectric ceramic piece having a pair of principal surfaces and a long side surface attached to one of the long side surfaces of said first ceramic piece, the principal surfaces of said first and second ceramic pieces forming common principal surfaces, said first and second ceramic pieces being poled substantially longitudinally and antiparallel, said electrodes being attached also to the respective principal surfaces of said second ceramic piece.
Claim 3
Dependent Claim
38 words
A transducer as claimed in claim 1, wherein a pair of mechanical resonators, each having at least one planar surface, are used as said electrodes, respectively, with said planar surface attached to each of said common principal surfaces.
Claim 4
Dependent Claim
32 words
A transducer as claimed in claim 2 of a shape of a cylinder in outline, said first and second ceramic pieces being disposed axially along a substantial diametrical plane of said cylinder.
Claim 5
Dependent Claim
33 words
A transducer as claimed in claim 2 of a shape of a square prism in outline, said first and second ceramic pieces being disposed axially along a substantial bisecting plane of said prism.
Claim 6
Dependent Claim
36 words
A transducer as claimed in claim 1, wherein a mechanical resonator having at least one planar surface is used as one of said electrodes, with said planar surface attached to one of said common principal surfaces.
References Cited (Backward Citations)
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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) | 1977-10-14 | 1978-04-15 | 1978-10-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-14 | 1982-04-15 | 1982-10-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-14 | 1986-04-15 | 1986-10-15 | $7700.00 | Window Closed / Lapsed |