US4401911A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Active suspension piezoelectric polymer transducer
Assignee: Thales SA
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Filing: 1981-03-02
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Granted: 1983-08-30
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Expires: 2001-03-02
Abstract
Abstract An electromechanical transducer comprising a radiating structure whose active element is formed by a polymer film placed between two electrodes. The invention provides a transducer in which a closure element having the exact shape of a spherical surface portion is connected to at least one active peripheral suspension which simulates the movements of a pulsating sphere portion completing the closure element.
Inventors
- 👤 Pierre Ravinet
- 👤 Francois Micheron
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:49
CPC Classifications
H; H04; H04R; H04R17/00; H04R17/005
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
108 words
An elctromechanical transducer comprising: a rigid support member; and a self supporting radiating structure having a marginal portion attached to said rigid support, said self supporting radiating structure including: a polymer material active wall having first and second edge regions, said first edge region being attached to said rigid support member, and a closure portion, made of a film shaped in the form of a spherical surface portion, connected to said second edge region of said active wall, said active wall being formed and positioned such that in response to an electrical excitation of said transducer, said second edge moves along marginal radii of said spherical surface portion.
Claim 2
Dependent Claim
108 words
An elctromechanical transducer comprising: a rigid support member; and a self supporting radiating structure having a marginal portion attached to said rigid support, said self supporting radiating structure including: a polymer material active wall having first and second edge regions, said first edge region being attached to said rigid support member, and a closure portion, made of a film shaped in the form of a spherical surface portion, connected to said second edge region of said active wall, said active wall being formed and positioned such that in response to an electrical excitation of said transducer, said second edge moves along marginal radii of said spherical surface portion.
Claim 3
Dependent Claim
19 words
A transducer according to claim 1, wherein said active wall is formed in the shape of a truncated pyramid.
Claim 4
Dependent Claim
14 words
A transducer according to claim 1, wherein said closure portion is a passive element.
Claim 5
Dependent Claim
26 words
A transducer according to claim 1, wherein said closure portion is an active element coated with electrodes on both its faces and having been polarized electrically.
Claim 6
Dependent Claim
16 words
A transducer according to claim 1, wherein said closure portion is shaped as a spherical skullcap.
Claim 7
Dependent Claim
30 words
A transducer according to claim 1, wherein said closure portion comprises a spherical zone; two active truncated cone-shaped sections being connected to the circular edges of said spherical surface portion.
Claim 8
Dependent Claim
18 words
A transducer according to claim 1, wherein said active wall comprises a film deformable along rectilinear generatrices thereof.
Claim 9
Dependent Claim
14 words
A transducer according to claim 1, wherein said active wall is a dimorphous structure.
Claim 10
Dependent Claim
17 words
A transducer according to claim 1, wherein said active wall comprises protuberances for increasing the compliance thereof.
Claim 11
Dependent Claim
55 words
A transducer according to claim 4, wherein the closure portion and the active wall are formed such that when an appropriate electrical excitation is applied to said transducer, a connecting edge of the active suspension simulates in magnitude and in sign the deformation which a pulsating sphere portion completing the closure portion would have imposed.
Claim 12
Dependent Claim
17 words
A transducer according to claim 1, wherein said closure portion comprises a relief for increasing compliance thereof.
Claim 13
Dependent Claim
22 words
A transducer according to claim 1, further comprising means for protecting against the staving in of convex parts of the radiating structure.
Claim 14
Dependent Claim
19 words
A transducer according to claim 1, wherein said active wall is formed in the shape of a truncated cone.
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) | 1986-08-29 | 1987-02-28 | 1987-08-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-08-29 | 1991-02-28 | 1991-08-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-08-29 | 1995-02-28 | 1995-08-30 | $7700.00 | Window Closed / Lapsed |