US4063049A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Piezoelectric electroacoustic transducer
Assignee: Italtel SpA
•
Filing: 1976-12-29
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Granted: 1977-12-13
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Expires: 1996-12-29
Abstract
Abstract An electroacoustic transducer, such as a microphone or a telephone receiver, comprises a thermoplastic body with a central plateau surrounded by an annular recess from which an elastic ring projects slightly above the plateau to support a membrane in the form of sheet-metal foil carrying a piezoceramic layer. The body is overlain by a thermoplastic cover which has apertures for the passage of sound waves and is formed with an internal annular rib registering with the elastic ring to clamp the rim of the membrane therebetween. The body, the cover and a thermoplastic base are joined together by ultrasonic welding.
Inventors
- 👤 Roberto Pipitone
- 👤 Colombo Gnocchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:30
CPC Classifications
H; H04; H04R; H04R7/00; H04R7/16; H04R7/18; H04R7/22; H04R17/00
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
93 words
An electroacoustic transducer comprising a dielectric body centered on an axis and provided with a central plateau surrounded by an annular recess, an apertured dielectric cover overlying said body and forming a flat sound chamber therebetween, an elastic ring in said recess rising above said plateau, said cover being formed within said sound chamber with an annular rib registering with said ring, a piezoelectric membrane in said sound chamber having a rim clamped between said ring and said rib, and conductor means in said body for connecting said membrane in an electric circuit.
Claim 2
Dependent Claim
93 words
An electroacoustic transducer comprising a dielectric body centered on an axis and provided with a central plateau surrounded by an annular recess, an apertured dielectric cover overlying said body and forming a flat sound chamber therebetween, an elastic ring in said recess rising above said plateau, said cover being formed within said sound chamber with an annular rib registering with said ring, a piezoelectric membrane in said sound chamber having a rim clamped between said ring and said rib, and conductor means in said body for connecting said membrane in an electric circuit.
Claim 3
Dependent Claim
33 words
A transducer as defined in claim 1 wherein said membrane comprises a metallic foil connected to said conductor means and a piezoceramic layer carried on the side of said foil confronting said plateau.
Claim 4
Dependent Claim
22 words
A transducer as defined in claim 2 wherein said layer has a radius less than those of said rib and said ring.
Claim 5
Dependent Claim
16 words
A transducer as defined in claim 1, further comprising a hollow dielectric base supporting said body.
Claim 6
Dependent Claim
19 words
A transducer as defined in claim 4 wherein said body, said cover and said base consist of thermoplastic material.
Claim 7
Dependent Claim
21 words
A transducer as defined in claim 5 wherein said body, said cover and said base are joined together by ultrasonic welds.
Claim 8
Dependent Claim
27 words
A transducer as defined in claim 1 wherein said ring projects above said plateau by a distance representing a small fraction of the depth of said recess.
Claim 9
Dependent Claim
22 words
A transducer as defined in claim 7 wherein said membrane divides said sound chamber into two compartments of approximately equal axial height.
Claim 10
Dependent Claim
31 words
A transducer as defined in claim 8 wherein said cover has a central depression slightly increasing the height of the compartment remote from said plateau in the region of said axis.
Claim 11
Dependent Claim
23 words
A transducer as defined in claim 1 wherein said ring has a cross-section converging to a narrow ridge in contact with said rim.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-12-12 | 1981-06-13 | 1981-12-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-12-12 | 1985-06-13 | 1985-12-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-12-12 | 1989-06-13 | 1989-12-13 | $7700.00 | Window Closed / Lapsed |