US3859546A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rectangular piezoelectric ceramic resonator oppositely poled along opposite side surfaces
Assignee: NEC Corp
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Filing: 1973-09-17
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Granted: 1975-01-07
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Expires: 1993-09-17
Abstract
Abstract A torsional mode electromechanical transducer comprises a piezoelectric ceramic piece oppositely poled along opposite side surfaces and a pair of electrodes attached to the respective principal surfaces of the ceramic piece. A mechanical resonator having appropriate planar surfaces may be attached to one or both of the electrodes with the ceramic piece. A pair of such piezoelectric ceramic pieces may be fixed together with a common electrode interposed and with the directions of residual polarization of the respective ceramic pieces disposed antiparallel.
Inventors
- 👤 Kikuo Doi
- 👤 Takehiro Futami
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 06:30
CPC Classifications
H; H03; H03H; H03H9/00; H03H9/46; H03H9/48; H03H9/50; H03H9/02; H03H9/125
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
77 words
A torsional mode electromechanical transducer comprising: a piezoelectric ceramic piece that is rectangular in outline and has a pair of opposing principal surfaces, and first and second sets of side surfaces extending between said principal surfaces; an electrode attached to each principle surface respectively; and said ceramic piece being poled in opposite directions along two paths formed by the first and second sets of the side surfaces toward both ends of a diagonal of the principal surface.
Claim 2
Dependent Claim
77 words
A torsional mode electromechanical transducer comprising: a piezoelectric ceramic piece that is rectangular in outline and has a pair of opposing principal surfaces, and first and second sets of side surfaces extending between said principal surfaces; an electrode attached to each principle surface respectively; and said ceramic piece being poled in opposite directions along two paths formed by the first and second sets of the side surfaces toward both ends of a diagonal of the principal surface.
Claim 3
Dependent Claim
31 words
An electromechanical transducer as set forth in claim 1, wherein at least one of said electrodes is a mechanical resonator having at least one planar surface attached to said ceramic piece.
Claim 4
Dependent Claim
27 words
An electromechanical transducer as set forth in claim 1, wherein each of said electrodes is a mechanical resonator having a planar surface attached to said ceramic piece.
Claim 5
Dependent Claim
123 words
An electromechanical transducer as set forth in claim 1, further comprising a second piezoelectric ceramic piece that is rectangular in outline and has a pair of opposing principal surfaces and first and second sets of side surfaces extending between the principal surfaces thereof, said second ceramic piece being poled in opposite directions along two paths formed by the first and second sets of side surfaces toward the ends of a diagonal of its principal surfaces with the directions of residual polarization of the respective ceramic pieces disposed antiparallel, one of the principal surfaces of said second ceramic piece being attached to one of said electrodes, said transducer further comprising an additional electrode attached to the remaining principal surface of said second ceramic piece.
Claim 6
Dependent Claim
42 words
An electromechanical transducer as set forth in claim 4, wherein a mechanical resonator having at least two parallel planar surfaces forms the electrode interposed between the two ceramic pieces with said ceramic pieces each attached to the one of the planar surfaces.
Claim 7
Dependent Claim
117 words
An electromechAnical transducer as set forth in claim 1, further comprising a second piezoelectric ceramic piece that is rectangular in outline and has a pair of opposing principal surfaces and first and second sets of side surfaces extending between the principal surfaces of each pair, said second ceramic piece being toward the ends of a diagonal of its principal surfaces, one of said electrodes being a mechanical resonator having at least two parallel planar surfaces, the two ceramic pieces being attached to said planar surfaces respectively, with the directions of residual polarization of the respective ceramic pieces disposed parallel, said transducer further comprising an additional electrode attached to the remaining principal surface of said second ceramic piece.
References Cited (Backward Citations)
US2880334A
Cited
US2838696A
Cited
US2906971A
Cited
US2978596A
Cited
US3293575A
Cited
US3774057A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-01-06 | 1978-07-08 | 1979-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-06 | 1982-07-08 | 1983-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-06 | 1986-07-08 | 1987-01-07 | $7700.00 | Window Closed / Lapsed |