US3657578A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Piezoelectric transducer elements
Assignee: Denki Onkyo Co Ltd
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Filing: 1970-09-17
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Granted: 1972-04-18
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Expires: 1990-09-17
Abstract
Abstract In a piezoelectric transducer element comprising an elongated ceramic plate of a piezoelectric material, a pair of driving electrodes applied on the opposite surfaces of one end of the plate and an output electrode applied to the end surface of the opposite end, an insulator member in the form of a thin coating or flange is applied to surround the plate at a point near the driving electrodes or the output electrode preferably at a node of the mechanical vibration of the element.
Inventors
- 👤 Keiji Inoue
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 08:22
CPC Classifications
H; H10; H10N; H10N30/00; H10N30/40
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
90 words
In a piezoelectric transducer element comprising an elongated ceramic plate of a piezoelectric material a pair of driving electrodes applied on the opposite surfaces of one end of said plate and an output electrode applied to the end surface of the opposite end, the improvement which comprises an insulator ring member means applied on the surface of said plate to surround said plate at a point between said input electrodes and said output electrode and provide a dielectric surface discontinuity for the potential distribution along the surface of said plate.
Claim 2
Dependent Claim
90 words
In a piezoelectric transducer element comprising an elongated ceramic plate of a piezoelectric material a pair of driving electrodes applied on the opposite surfaces of one end of said plate and an output electrode applied to the end surface of the opposite end, the improvement which comprises an insulator ring member means applied on the surface of said plate to surround said plate at a point between said input electrodes and said output electrode and provide a dielectric surface discontinuity for the potential distribution along the surface of said plate.
Claim 3
Dependent Claim
26 words
The improvement according to claim 1 wherein said insulator member comprises at least one insulator coating of limited width and is located near said driving electrodes.
Claim 4
Dependent Claim
16 words
The improvement according to claim 2 wherein said insulator member is located near said output electrode.
Claim 5
Dependent Claim
30 words
The improvement according to claim 1 wherein said insulator member is located at a node of the mechanical vibrations of said element between said driving electrodes and said output electrode.
Claim 6
Dependent Claim
33 words
The improvement according to claim 1 wherein said insulator member comprises a thin flange of insulator material having sufficient height to electrically isolate said driving electrodes and said output electrode from each other.
References Cited (Backward Citations)
US2975354A
Cited
US3281726A
Cited
US3564463A
Cited
US3564463B1
Cited
US3518573A
Cited
US3562798A
Cited
US3562563A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-04-18 | 1975-10-18 | 1976-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-18 | 1979-10-18 | 1980-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-18 | 1983-10-18 | 1984-04-18 | $7700.00 | Window Closed / Lapsed |