US3646281A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrostatic transducer with vented diaphragm
Assignee: RDF WEST
•
Filing: 1969-06-02
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Granted: 1972-02-29
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Expires: 1989-06-02
Abstract
Abstract An acoustic pressure transducer wherein a thin metallic diaphragm is mounted in close proximity to a backplate and electrically insulated therefrom to form a capacitor which is variable in capacity in response to variations in acoustical pressure, and at least one capillary aperture is effected through the diaphragm to thereby reduce differentials in static air pressure on opposite sides of the diaphragm.
Inventors
- 👤 Richard D Mcgunigle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 09:44
CPC Classifications
H; H04; H04R; H04R19/00; H04R19/04; H04R1/00; H04R1/20; H04R1/22; H04R1/222; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49005; Y10T29/49826; Y10T29/49863; Y10T29/49867
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
98 words
A method for making an acoustic pressure transducer incorporating a thin metallic diaphragm, comprising: mounting said diaphragm under static tension in close adjacent proximity to the entire front surface of a backplate electrically insulated therefrom so as to form a variable capacitor with said entire front backplate surface which is variable in capacity in response to acoustic pressure variations; and effecting a plurality of capillary vent apertures in the form of round holes through periphery portions of said diaphragm spaced laterally from said backplate to thereby reduce differentials in static air pressure on opposite sides of said diaphragm.
Claim 2
Independent Claim
98 words
A method for making an acoustic pressure transducer incorporating a thin metallic diaphragm, comprising: mounting said diaphragm under static tension in close adjacent proximity to the entire front surface of a backplate electrically insulated therefrom so as to form a variable capacitor with said entire front backplate surface which is variable in capacity in response to acoustic pressure variations; and effecting a plurality of capillary vent apertures in the form of round holes through periphery portions of said diaphragm spaced laterally from said backplate to thereby reduce differentials in static air pressure on opposite sides of said diaphragm.
Claim 3
Dependent Claim
15 words
The method of claim 1 wherein said aperture is effected subsequent to mounting said diaphragm.
Claim 4
Dependent Claim
21 words
The method of claim 1 wherein said diaphragm is mounted so as to form a closed chamber except for said aperture.
Claim 5
Dependent Claim
27 words
The method of claim 1 wherein said apertures is effected by subjecting said diaphragm to a narrow beam of energy of sufficient intensity to pierce said diaphragm.
Claim 6
Dependent Claim
24 words
The method of claim 4 wherein said beam of energy is obtained by providing means for emitting electromagnetic radiation and coherently stimulating said emission.
Claim 7
Dependent Claim
14 words
The method of claim 4 wherein said beam of energy is an electron beam.
Claim 8
Dependent Claim
48 words
The method of claim 2 including the steps of: determining the low frequency response of said transducer; comparing said response to a desired low frequency response; and effecting the formation of at least one additional vent aperture through said diaphragm to thereby more closely approach said desired response.
Claim 9
Dependent Claim
94 words
An acoustic pressure transducer, comprising: a thin metallic diaphragm; a backplate; and means spacing said diaphragm under static tension in close adjacent proximity to the entire front surface of said backplate so as to form a capacitor with said entire front backplate surface which is variable in capaCity in response to dynamic pressure variations; said diaphragm defining a plurality of capillary vent apertures in the form of round holes through periphery portions of said diaphragm spaced laterally from said backplate whereby differentials in static air pressure on opposite sides of said diaphragm are reduced.
Claim 10
Dependent Claim
94 words
An acoustic pressure transducer, comprising: a thin metallic diaphragm; a backplate; and means spacing said diaphragm under static tension in close adjacent proximity to the entire front surface of said backplate so as to form a capacitor with said entire front backplate surface which is variable in capaCity in response to dynamic pressure variations; said diaphragm defining a plurality of capillary vent apertures in the form of round holes through periphery portions of said diaphragm spaced laterally from said backplate whereby differentials in static air pressure on opposite sides of said diaphragm are reduced.
Claim 11
Dependent Claim
33 words
The transducer of claim 8 including a housing and means electrically insulating said housing from said backplate, said diaphragm housing and insulating means forming a closed chamber except for said capillary vent aperture.
Claim 12
Dependent Claim
58 words
The transducer of claim 8 including a second thin metallic diaphragm mounted spaced from the aforesaid diaphragm, said second diaphragm defining at least one capillary vent aperture in the form of a round hole whereby differentials in static air pressure on opposite sides of said diaphragm are reduced to thereby constitute a dynamic pressure filter for said transducer.
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) | 1975-02-28 | 1975-08-30 | 1976-02-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-28 | 1979-08-30 | 1980-02-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-28 | 1983-08-30 | 1984-02-29 | $7700.00 | Window Closed / Lapsed |