Patent US3220464A successfully refreshed from Google Patents.
Patent US3835340A successfully refreshed from Google Patents.
US3835340A
Expired / Lapsed
US
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Transducer corona shield
Assignee: Edo Corp
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Filing: 1973-02-15
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Granted: 1974-09-10
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Expires: 1993-02-15
Abstract
Abstract In an electroacoustic transducer, corona in the interface between the ceramic transducer element and the electrically conductive transducer end mass, supporting structure, or the like, is substantially eliminated by means of a corona shield electrode on the ceramic element in the interface and electrically connected to the end mass or other conductive structure.
Inventors
- 👤 S Schildkraut
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 07:49
CPC Classifications
H; H04; H04R; H04R17/00
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
103 words
In a transducer including a first electrode connected to a fIrst insulator of relatively high dielectric constant, a conductive end mass positioned adjacent a surface of said first insulator and insulated from said first electrode, and a second insulator of relatively low dielectric constant in at least some portions of the interface between said end mass and said surface of said first insulator, the improvement comprising: a second electrode substantially covering the surface of said first insulator adjacent said end mass so as to separate said first and second insulators and means for conductively connecting said second electrode to said conductive end mass.
Claim 2
Dependent Claim
103 words
In a transducer including a first electrode connected to a fIrst insulator of relatively high dielectric constant, a conductive end mass positioned adjacent a surface of said first insulator and insulated from said first electrode, and a second insulator of relatively low dielectric constant in at least some portions of the interface between said end mass and said surface of said first insulator, the improvement comprising: a second electrode substantially covering the surface of said first insulator adjacent said end mass so as to separate said first and second insulators and means for conductively connecting said second electrode to said conductive end mass.
Claim 3
Dependent Claim
16 words
The apparatus defined in claim 1 wherein said second electrode is a layer of fired-on metal.
Claim 4
Dependent Claim
17 words
The apparatus defined in claim 1 wherein said second electrode is a layer of electrically conductive paint.
Claim 5
Dependent Claim
26 words
The apparatus defined in claim 1 wherein said means for conductively connecting comprises a perforated metal plate between said second electrode and said conductive end mass.
Claim 6
Dependent Claim
14 words
The apparatus defined in claim 1, wherein said first insulator is a piezoelectric ceramic.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-09-09 | 1978-03-11 | 1978-09-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-09 | 1982-03-11 | 1982-09-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-09 | 1986-03-11 | 1986-09-10 | $7700.00 | Window Closed / Lapsed |