US4885783A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Elastomer membrane enhanced electrostatic transducer
Assignee: SOUND CHEERS Ltd
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Filing: 1987-04-10
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Granted: 1989-12-05
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Expires: 2007-04-10
Abstract
Abstract A transducer having opposed first and second conductive plates for application of an electrical potential difference therebetween. An elastomeric dielectric material such as neoprene rubber is disposed between the plates and in contact therewith. The dielectric material has a plurality of pockets of approximate average depth "d" such that, for a given gas maintained within the pockets at a pressure "P", the product Pd is significantly less than the value required to achieve the minimum breakdown voltage for the gas in the pockets. Alternatively, the elastomeric dielectric material disposed between the plates may take the form of a plurality of strips or nodules which separate the plates by a distance "d" as above.
Inventors
- 👤 Lorne A. Whitehead
- 👤 Robert L. Clark
- 👤 Francis L. Curzon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:00
CPC Classifications
H; H04; H04R; H04R19/00; B; B06; B06B; B06B1/00; B06B1/02; B06B1/0292
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
76 words
A transducer, comprising: (a) opposed first and second conductive plates for application of an electrical potential therebetween; and, (b) an elastomeric dielectric material disposed between said plates and in contact therewith; said dielectric material having a plurality of pockets of approximate average depth "d" such that, for a gas existing within said pockets at a pressure "P", the product Pd is significantly less than the value required to achieve the minimum breakdown voltage of said gas.
Claim 2
Dependent Claim
76 words
A transducer, comprising: (a) opposed first and second conductive plates for application of an electrical potential therebetween; and, (b) an elastomeric dielectric material disposed between said plates and in contact therewith; said dielectric material having a plurality of pockets of approximate average depth "d" such that, for a gas existing within said pockets at a pressure "P", the product Pd is significantly less than the value required to achieve the minimum breakdown voltage of said gas.
Claim 3
Dependent Claim
73 words
A transducer, comprising: (a) opposed first and second conductive plates for application of an electrical potential therebetween; and, (b) an elastomeric dielectric material disposed between said plates and in contact therewith, for separating said plates by a distance "d" and for allowing a gas to exist between said plates at a pressure "P", wherein the product Pd is significantly less than the value required to achieve the minimum breakdown voltage of said gas.
Claim 4
Dependent Claim
73 words
A transducer, comprising: (a) opposed first and second conductive plates for application of an electrical potential therebetween; and, (b) an elastomeric dielectric material disposed between said plates and in contact therewith, for separating said plates by a distance "d" and for allowing a gas to exist between said plates at a pressure "P", wherein the product Pd is significantly less than the value required to achieve the minimum breakdown voltage of said gas.
Claim 5
Dependent Claim
97 words
A transducer, comprising: (a) a plurality of conductive plates arranged in a stack for application of an electrical potential between each pair of opposed plates comprising said stack; and, (b) an elastomeric dielectric material disposed between and in contact with each pair of opposed plates comprising said stack; said dielectric material separating each of said pairs of opposed plates by a distance "d" and for allowing a gas to exist between said plates at a pressure "P", wherein the product Pd is significantly less than the value required to achieve the minimum breakdown voltage of said gas.
Claim 6
Dependent Claim
97 words
A transducer, comprising: (a) a plurality of conductive plates arranged in a stack for application of an electrical potential between each pair of opposed plates comprising said stack; and, (b) an elastomeric dielectric material disposed between and in contact with each pair of opposed plates comprising said stack; said dielectric material separating each of said pairs of opposed plates by a distance "d" and for allowing a gas to exist between said plates at a pressure "P", wherein the product Pd is significantly less than the value required to achieve the minimum breakdown voltage of said gas.
Claim 7
Dependent Claim
27 words
A transducer as defined in claim 1, 2 or 3, further comprising an electrical insulating material disposed between each of said plates and said elastomeric dielectric material.
Claim 8
Dependent Claim
28 words
A transducer as defined in claim 1, 2 or 3 wherein said gas is air, "P" is normal atmospheric pressure, and "d" is less than about 16 microns.
Claim 9
Dependent Claim
17 words
A transducer is defined in claim 1, 2 or 3 wherein said dielectric material is neoprene rubber.
Claim 10
Dependent Claim
30 words
A transducer as defined in claim 1, 2 or 3 wherein said gas is an electronegative gas, "P" is normal atmospheric pressure and "d" is less than about 10 microns.
Claim 11
Dependent Claim
21 words
A transducer as defined in claim 1, 2 or 3 wherein said gas is a mixture of electronegative and non-electronegative gases.
Claim 12
Dependent Claim
18 words
A transducer as defined in claim 1, 2 or 3 wherein said plates are formed of aluminized mylar.
Claim 13
Dependent Claim
40 words
A transducer as defined in claim 1, 2 or 3, wherein said dielectric material is disposed at a plurality of sites between said plates, leaving said gas between and in contact with said plates at regions other than said sites.
Claim 14
Dependent Claim
54 words
A transducer as defined in claim 2 or 3, wherein: (a) a first plurality of strips of elastomeric dielectric material are disposed between said plates in a first direction; and, (b) a second plurality of strips of elastomeric dielectric material are disposed between said plates in a second direction different than said first direction.
Claim 15
Dependent Claim
23 words
A transducer as defined in claim 1, 2 or 3, wherein said dielectric material is a composite structure of elastomeric and non-elastomeric material.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-12-04 | 1993-06-05 | 1993-12-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-12-04 | 1997-06-05 | 1997-12-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-12-04 | 2001-06-05 | 2001-12-05 | $7700.00 | Window Closed / Lapsed |