Patent US3894333A successfully refreshed from Google Patents.
US3894333A
Expired / Lapsed
US
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Electromechanical transducer and method of making same
Assignee: Uniroyal Ltd Great Britain
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Filing: 1973-05-11
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Granted: 1975-07-15
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Expires: 1993-05-11
Abstract
Abstract An electromechanical transducer suitable for push-pull operation and a method of making the same. The transducer utilizes stators comprising electrets and a diaphragm comprising a layer of conductive material supported between the electret stators. The stators may be electrostatically polarized after assembly with the diaphragm, providing high conversion efficiency and low distortion. The transducer is particularly adapted for use in an earphone.
Inventors
- 👤 Loh-Yi Chang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 03:55
CPC Classifications
H; H04; H04R; H04R19/00; H04R19/01; H04R19/013; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49005
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
103 words
The method of making an electromechanical transducer comprising assembling in spaced relation a pair of electret stator means each having a conductive member thereon and each having apertures therethrough, and thin, vibratory diaphragm means comprising a pair of layers of conductive material individually on a pair of films of plastic material supported between said stator means with each of said plastic films being between the conductive layer thereon and the stator means adjacent thereto, and electrostatically polarizing the assembled stator means by applying a high potential difference from said conductive member of each stator means to said conductive layers of said diaphragm means.
Claim 2
Independent Claim
103 words
The method of making an electromechanical transducer comprising assembling in spaced relation a pair of electret stator means each having a conductive member thereon and each having apertures therethrough, and thin, vibratory diaphragm means comprising a pair of layers of conductive material individually on a pair of films of plastic material supported between said stator means with each of said plastic films being between the conductive layer thereon and the stator means adjacent thereto, and electrostatically polarizing the assembled stator means by applying a high potential difference from said conductive member of each stator means to said conductive layers of said diaphragm means.
Claim 3
Dependent Claim
43 words
The method in accordance with claim 1 in which the step of polarizing the assembled stator means includes the step of applying the same high potential difference from said conductive member of each stator means to said conductive layer of said diaphragm means.
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) | 1978-07-14 | 1979-01-13 | 1979-07-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-14 | 1983-01-13 | 1983-07-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-14 | 1987-01-13 | 1987-07-15 | $7700.00 | Window Closed / Lapsed |