US4453044A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electro-acoustic transducer with plural piezoelectric film
Assignee: LECTRET SA A SWISS CORP
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Filing: 1983-01-26
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Granted: 1984-06-05
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Expires: 2003-01-26
Abstract
Abstract An acoustic transducer having a plurality of piezoelectric polymer films spaced apart and mounted at their peripheries upon a hollow support member, and physically connected together at center portions such that the films are parallel to each other at the center portions and diverging from each other near the peripheries.
Inventors
- 👤 Preston V. Murphy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:55
CPC Classifications
H; H04; H04R; H04R17/00; H04R17/005; H04R2499/00; H04R2499/10; H04R2499/11; Y; Y10; Y10S; Y10S310/00; Y10S310/80
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
66 words
An acoustic transducer comprising a hollow support member, and a plurality of metallized piezoelectric films operating as an oscillator, said films being mounted at their peripheries upon the hollow support member so that their peripheries are spaced apart, and being physically connected at center portions so that the films are parallel to each other throughout said center portions and diverging from each other near their peripharies.
Claim 2
Dependent Claim
66 words
An acoustic transducer comprising a hollow support member, and a plurality of metallized piezoelectric films operating as an oscillator, said films being mounted at their peripheries upon the hollow support member so that their peripheries are spaced apart, and being physically connected at center portions so that the films are parallel to each other throughout said center portions and diverging from each other near their peripharies.
Claim 3
Dependent Claim
18 words
The transducer of claim 1 wherein said films are glued together at said center portions by epoxy adhesive.
Claim 4
Dependent Claim
18 words
The transducer of claim 1 wherein said films are thermally welded to each other at said center portions.
Claim 5
Dependent Claim
47 words
The transducer of claim 1 wherein said transducer is designed to convert sound into an electrical signal, and said films are electrically connected in series with their polarities selected in such a way that the output voltage of each said film is added when said films oscillate.
Claim 6
Dependent Claim
49 words
The transducer of claim 1 wherein said transducer is designed to convert sound into an electrical signal, and said films are electrically connected in parallel with their polarities selected in such a way that the current produced by each of the said films is added when said films oscillate.
Claim 7
Dependent Claim
38 words
The transducer of claim 1 wherein said transducer is designed to produce sound, and said films are electrically connected with their polarities selected in such a way that said films move in the same direction when electrically excited.
Claim 8
Dependent Claim
27 words
The transducer of claim 1 wherein the areas of said center portions are less than or equal to about one-third of the surface area of said films.
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) | 1987-06-05 | 1987-12-05 | 1988-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-06-05 | 1991-12-05 | 1992-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-06-05 | 1995-12-05 | 1996-06-05 | $7700.00 | Window Closed / Lapsed |