US3821491A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Microphone construction
Assignee: Amperex Electronic Corp
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Filing: 1972-05-15
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Granted: 1974-06-28
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Expires: 1992-05-15
Abstract
Abstract A novel construction method is provided for a linear extended capacitor electret foil construction microphone with a construction technique providing an infinite number of small capacitors in an equidistribution arrangement, for providing maximum sensitivity for given field strengths, and to provide an in situ method of microphone fabrication wherein the microphone is completely assembled and run through each heat cycling polarization to produce a finished thermo electret element.
Inventors
- 👤 A Whetstone
- 👤 S Fine
- 👤 R Davis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 11:34
CPC Classifications
H; H04; H04R; H04R19/00; H04R19/01; H04R19/016; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49005
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
97 words
A microphone construction comprising: an elongated conductive frame member; a plurality of non-moveable plate sections affixed to and insulated from said frame, each said plate section including a conductive surface facing away from said frame and having a multiplicity of distributed minute depressions therein; a plurality of thin moveable electret insulating film sections disposed on the conductive surfaces of said plate sections, each of said film sections having an outer conductive layer; means for coupling each of said outer conductive layers to said frame; and means for coupling the plate sections in series to a common output.
Claim 2
Dependent Claim
97 words
A microphone construction comprising: an elongated conductive frame member; a plurality of non-moveable plate sections affixed to and insulated from said frame, each said plate section including a conductive surface facing away from said frame and having a multiplicity of distributed minute depressions therein; a plurality of thin moveable electret insulating film sections disposed on the conductive surfaces of said plate sections, each of said film sections having an outer conductive layer; means for coupling each of said outer conductive layers to said frame; and means for coupling the plate sections in series to a common output.
Claim 3
Independent Claim
86 words
A method of manufacturing a microphone on an elongated frame member comprising the steps of: applying a conductor-clad insulator to said frame, the insulating side facing said frame; sectioning the first applied layer into multiple sections; applying an insulating layer having a thin conductive film on the outer surface thereof to said conductor-clad insulator; electrically coupling said sections in series; applying a voltaGe between said conductive film and the conductive sections of said conductor-clad insulator; and heating the entire assembly while said voltage is being applied.
Claim 4
Independent Claim
86 words
A method of manufacturing a microphone on an elongated frame member comprising the steps of: applying a conductor-clad insulator to said frame, the insulating side facing said frame; sectioning the first applied layer into multiple sections; applying an insulating layer having a thin conductive film on the outer surface thereof to said conductor-clad insulator; electrically coupling said sections in series; applying a voltaGe between said conductive film and the conductive sections of said conductor-clad insulator; and heating the entire assembly while said voltage is being applied.
Claim 5
Dependent Claim
33 words
The method as defined by claim 2 comprising the additional step of removing a multiplicity of particles from the conductive portion of said conductor-clad insulator before the application of said insulating layer thereto.
Claim 6
Dependent Claim
25 words
The method as defined by claim 2 comprising the additional step of electrically coupling said conductive film to said frame before application of said voltage.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-27 | 1977-12-27 | 1978-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-27 | 1981-12-27 | 1982-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-27 | 1985-12-27 | 1986-06-28 | $7700.00 | Window Closed / Lapsed |