US3787642A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrostatic transducer having resilient electrode
Assignee: AG Communication Systems Corp
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Filing: 1971-09-27
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Granted: 1974-01-22
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Expires: 1991-09-27
Abstract
Abstract An electro-acoustic transducer having a flexible diaphragm and a backplate of resilient construction and a front element of metalized foil. In a preferred embodiment of the invention the transducer is a condenser microphone wherein the insulating film that comprises the diaphragm is an electret. In alternate embodiments the foil element may be replaced by an element constructed of resilient foam-like material.
Inventors
- 👤 R Young
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:29
CPC Classifications
H; H04; H04R; H04R19/00; H04R19/01
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
86 words
An electrostatic transducer comprising: a movable diaphragm of dielectric material including first and second surface areas; a first electrically conductive element positioned adjacent to said diaphragm first surface area; a second electrically conductive element positioned adjacent said diaphragm second surface area; at least one of said electrically conductive elements being movable and of resilient construction, said resilient construction enabling said conductive element to function as a variable mechanical impedance; and electrical conductors connected to said elements, to permit electrical connections to be made to said transducer.
Claim 2
Dependent Claim
86 words
An electrostatic transducer comprising: a movable diaphragm of dielectric material including first and second surface areas; a first electrically conductive element positioned adjacent to said diaphragm first surface area; a second electrically conductive element positioned adjacent said diaphragm second surface area; at least one of said electrically conductive elements being movable and of resilient construction, said resilient construction enabling said conductive element to function as a variable mechanical impedance; and electrical conductors connected to said elements, to permit electrical connections to be made to said transducer.
Claim 3
Dependent Claim
15 words
An electrostatic transducer as claimed in claim 1 wherein said diaphragm dielectric material is pre-polarized.
Claim 4
Dependent Claim
25 words
An electrostatic transducer as claimed in claim 1 wherein said diaphragm dielectric material is polarized by application of a bias voltage to said electrical conductors.
Claim 5
Dependent Claim
18 words
An electrostatic transducer as claimed in claim 1 wherein said second element is movable and of resilient construction.
Claim 6
Dependent Claim
18 words
An electrostatic transducer as claimed in claim 4 wherein said first element is constructed of electrically conductive foil.
Claim 7
Dependent Claim
23 words
An electrostatic transducer as claimed in claim 5 wherein said foil first element is in direct contact with said diaphragm first surface area.
Claim 8
Dependent Claim
28 words
An electrostatic transducer as claimed in claim 4 wherein said resiliently constructed second element includes a plurality of raised areas in contact with said diaphragm second surface area.
Claim 9
Dependent Claim
26 words
An electrostatic transducer as claimed in claim 4 wherein said resiliently constructed second element is spatially separated from said diaphragm second surface area, by spacing means.
Claim 10
Dependent Claim
31 words
An electrostatic transducer as claimed in claim 8 wherein said spacing means comprise a plurality of strips of dielectric material positioned between said second element and said diaphragm second surface area.
Claim 11
Dependent Claim
21 words
An electrostatic transducer as claimed in claim 4 wherein said resiliently constructed second element is formed of electrically conductive foam material.
Claim 12
Dependent Claim
19 words
An electrostatic transducer as claimed in claim 10 wherein said foam material contains a substantially high percentage of carbon.
Claim 13
Dependent Claim
20 words
An electrostatic transducer as claimed in claim 1 wherein said first electrically conductive element is movable and of resilient construction.
Claim 14
Dependent Claim
28 words
An electrostatic transducer as claimed in claim 12 wherein said resiliently constructed first element includes a plurality of raised areas in contact with said diaphragm first surface area.
Claim 15
Dependent Claim
26 words
An electrostatic transducer as claimed in claim 12 wherein said resiliently constructed first element is spatially separated from said diaphragm first surface area, by spacing means.
Claim 16
Dependent Claim
31 words
An electrostatic transducer as claimed in claim 14 wherein said spring means comprise a plurality of strips of dielectric material positioned between said first element and said diaphragm first surface area.
Claim 17
Dependent Claim
21 words
An electrostatic transducer as claimed in claim 12 wherein said resiliently constructed first element is formed of electrically conductive foam material.
Claim 18
Dependent Claim
19 words
An electrostatic transducer as claimed in claim 16 wherein said foam material contains a substantially high percentage of carbon.
Claim 19
Dependent Claim
23 words
An electrostatic transducer as claimed in claim 1 wherein said first and second electrically conductive elements are both movable and of resilient construction.
Claim 20
Dependent Claim
48 words
An electrostatic transducer as claimed in claim 18 wherein said resiliently constructed first element includes a plurality of raised areas in contact with said diaphragm first surface area and said resiliently constructed second element includes a plurality of raised areas in contact with said diaphragm second surface area.
Claim 21
Dependent Claim
46 words
An electrostatic transducer as claimed in claim 18 wherein said resiliently constructed first element is spatially separated from said diaphragm first surface area by first spacing means and said rEsiliently constructed second element is spatially separated from said diaphragm second surface area by second spacing means.
Claim 22
Dependent Claim
56 words
An electrostatic transducer as claimed in claim 20 wherein said first spacing means comprise a plurality of strips of dielectric material positioned between said first element and said diaphragm first surface area and said second spacing means comprise a plurality of strips of dielectric material positioned between said second element and said diaphragm second surface area.
Claim 23
Dependent Claim
24 words
An electrostatic transducer as claimed in claim 18 wherein said resiliently constructed first and second elements are both formed of electrically conductive foam material.
Claim 24
Dependent Claim
19 words
An electrostatic transducer as claimed in claim 22 wherein said foam material contains a substantially high percentage of carbon.
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) | 1977-01-21 | 1977-07-23 | 1978-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-21 | 1981-07-23 | 1982-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-21 | 1985-07-23 | 1986-01-22 | $7700.00 | Window Closed / Lapsed |