US4419599A
Expired / Lapsed
US
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Piezoelectric transducer made from a polymer material and process for manufacturing same
Assignee: Thales SA
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Filing: 1982-04-21
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Granted: 1983-12-06
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Expires: 2002-04-21
Abstract
Abstract Piezoelectric and pyroelectric transducers whose active element is formed by a polymer film. The transducer is manufactured from a flat polymer film by stretching this film over a mold so as to give it a self-supporting form and electroforming the stretched film by means of a corona discharge so as to induce in the polymer film a macromolecular chain translation between reversed and non-reversed neighboring chains.
Inventors
- 👤 Francois Micheron
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:02
CPC Classifications
H; H10; H10N; H10N30/00; H10N30/01; H10N30/09; H10N30/098; H04; H04R; H04R17/00; H04R17/005; H10N30/04; H10N30/045; Y; Y10; Y10S; Y10S310/00; Y10S310/80; Y10T; Y10T29/00; Y10T29/42
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
75 words
In a piezoelectric transducer whose active element is formed by a polymer film forming a self-supporting structure provided with electrodes on both its faces, the part of the film between said electrodes contains at least one non-developable zone mechanically relaxed and caused to change from a non-polar to a polar phase by an electric field applied thereto; said electric filed inducing in said polymer film a macromolecular chain transition between reversed and non-reversed neighboring chains.
Claim 2
Dependent Claim
75 words
In a piezoelectric transducer whose active element is formed by a polymer film forming a self-supporting structure provided with electrodes on both its faces, the part of the film between said electrodes contains at least one non-developable zone mechanically relaxed and caused to change from a non-polar to a polar phase by an electric field applied thereto; said electric filed inducing in said polymer film a macromolecular chain transition between reversed and non-reversed neighboring chains.
Claim 3
Dependent Claim
15 words
The transducer as claimed in claim 1, wherein said self-supporting structure has a convex shape.
Claim 4
Dependent Claim
17 words
The transducer as claimed in claim 1, wherein a rigid collar is provided encircling the electroformed zone.
Claim 5
Dependent Claim
17 words
The transducer as claimed in claim 1, wherein said polymer film is a film of vinylidene polyfluoride.
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) | 1986-12-05 | 1987-06-06 | 1987-12-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-12-05 | 1991-06-06 | 1991-12-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-12-05 | 1995-06-06 | 1995-12-06 | $7700.00 | Window Closed / Lapsed |