Patent US3833770A successfully refreshed from Google Patents.
US3833770A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrostatic acoustic transducer
Assignee: Panasonic Holdings Corp
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Filing: 1972-02-29
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Granted: 1974-09-03
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Expires: 1992-02-29
Abstract
Abstract A high-fidelity electrostatic acoustic transducer comprising a pair of fixed electrodes with a multiplicity of small openings and supported opposite to each other and a vibrating film electret with a conductive layer formed on one side thereof, the vibrating film being held between the fixed electrodes as an acoustic transducer section. An electrostatic field is generated between the electret and one of the fixed electrodes by the electret and thereby the second higher harmonics generated between one of the fixed electrodes and the vibrating film electret are capable of being eliminated on the other fixed electrode.
Inventors
- 👤 N Atoji
- 👤 T Aoi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:28
CPC Classifications
H; H04; H04R; H04R19/00; H04R19/01; H04R19/013
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
63 words
An electrostatic acoustic transducer comprising a pair of fixed electrodes each with a multiplicity of openings, said electrodes being supported opposite to each other, and a single vibrating film electret with a conductive layer formed on one outer surface thereof facing only one of said electrodes, said vibrating film electret being held between said fixed electrodes and separated therefrom by an air layer.
Claim 2
Dependent Claim
63 words
An electrostatic acoustic transducer comprising a pair of fixed electrodes each with a multiplicity of openings, said electrodes being supported opposite to each other, and a single vibrating film electret with a conductive layer formed on one outer surface thereof facing only one of said electrodes, said vibrating film electret being held between said fixed electrodes and separated therefrom by an air layer.
Claim 3
Dependent Claim
29 words
An electrostatic acoustic transducer according to claim 1, in which said pair of fixed electrodes are connected with the output terminals of the secondary winding of a boosting transformer.
Claim 4
Dependent Claim
62 words
An electrostatic acoustic transducer according to claim 1, in which said pair of fixed electrodes are connected with the output terminals of the secondary winding of a boosting transformer, a pair of series-connected capacitors is inserted between said output terminals of said boosting transformer, and a junction point between the pair of capacitors is connected through a resistor to said conductive layer.
Claim 5
Dependent Claim
46 words
An electrostatic acoustic transducer according to claim 1, in which said conductive layer is connected with an intermediate terminal of the secondary Winding of a push-pull transformer, and the end terminals of said secondary winding of said push-pull transformer are connected with the fixed electrodes respectively.
Claim 6
Dependent Claim
89 words
An electrostatic acoustic transducer comprising an annular frame, a single layer vibrating film electret having a conductive layer formed on one outer surface and attached to the upper surface of said frame, a pair of fixed electrodes between which said vibrating film electret is interposed, said conductive layer being in spaced facing relation to only one of said electrodes, and a fastening means for supporting said annular frame and said fixed electrodes, said fastening means being provided with a conductive layer and terminals electrically connected with said fixed electrodes.
Claim 7
Dependent Claim
89 words
An electrostatic acoustic transducer comprising an annular frame, a single layer vibrating film electret having a conductive layer formed on one outer surface and attached to the upper surface of said frame, a pair of fixed electrodes between which said vibrating film electret is interposed, said conductive layer being in spaced facing relation to only one of said electrodes, and a fastening means for supporting said annular frame and said fixed electrodes, said fastening means being provided with a conductive layer and terminals electrically connected with said fixed electrodes.
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) | 1977-09-02 | 1978-03-04 | 1978-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-02 | 1982-03-04 | 1982-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-02 | 1986-03-04 | 1986-09-03 | $7700.00 | Window Closed / Lapsed |