Patent US4914565A successfully refreshed from Google Patents.
US4914565A
Expired / Lapsed
US
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Piezo-electric transducer having electrodes that adhere well both to ceramic as well as to plastics
Assignee: Siemens AG
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Filing: 1988-04-28
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Granted: 1990-04-03
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Expires: 2008-04-28
Abstract
Abstract The invention is directed to a piezo-electric transducer having electrodes that adhere well both to ceramic as well as to plastics and that are composed of intrinsically conductive plastic. The invention is also directed to a method for the manufacture thereof. A conductive polymer layer is produced on the surface of a piezo-ceramic component by chemical or anodic oxidation of a monomer. The monomers are selected from the class of 5-member heterocycles containing sulfur or nitrogen as heteroatom, or aniline, azuline, or derivatives of the said compounds. The components provided with the economical electrodes can be advantageously composed to form sandwich-like transducers having plastic intermediate layers that exhibit good electro-acoustical properties.
Inventors
- 👤 Manfred Schnoeller
- 👤 Jutta Mohaupt
- 👤 Wolfram Wersing
- 👤 Karl Lubitz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:08
CPC Classifications
H; H10; H10N; H10N30/00; H10N30/01; H10N30/06; H10N30/80; H10N30/87; H10N30/871; H10N30/067; H10N30/877; H10N30/878
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
110 words
A method for manufacturing a piezo-electric transducer having electrodes that adhere both to ceramic and plastic comprising the steps of: applying a monomer of an intrinsically conductive plastic to mutually opposite sides of a lamina-shaped, piezo-ceramic component, said intrinsically conductive plastic being a plastic which is electrically conductive without the addition of electrically conductive particles; polymerizing the monomer by an oxidation chosen from the group consisting of chemical or anodic oxidation to produce an intrinsic conductive electrode layer; and joining a plurality of piezo-ceramic components to form a sandwich-like structure, the components being arranged in layers above one another at a defined spacing and interspaces are filled with a plastic.
Claim 2
Independent Claim
110 words
A method for manufacturing a piezo-electric transducer having electrodes that adhere both to ceramic and plastic comprising the steps of: applying a monomer of an intrinsically conductive plastic to mutually opposite sides of a lamina-shaped, piezo-ceramic component, said intrinsically conductive plastic being a plastic which is electrically conductive without the addition of electrically conductive particles; polymerizing the monomer by an oxidation chosen from the group consisting of chemical or anodic oxidation to produce an intrinsic conductive electrode layer; and joining a plurality of piezo-ceramic components to form a sandwich-like structure, the components being arranged in layers above one another at a defined spacing and interspaces are filled with a plastic.
Claim 3
Dependent Claim
44 words
The method of claim 1 wherein the monomer is chosen from the group of compounds consisting of the class of five-membered heterocyclenes, aniline, azulene, and derivatives of these compounds which contain an element chosen from the group consisting of sulfur and nitrogen as heteroatom.
Claim 4
Dependent Claim
15 words
The method of claim 2 wherein the interspaces are filled with an injection molding method.
Claim 5
Dependent Claim
14 words
The method of claim 2 wherein the interspaces are filled with expanded cellular material.
Claim 6
Dependent Claim
20 words
The method of claim 2 wherein the anodic oxidation of the monomer ensues in the presence of a conducting salt.
Claim 7
Dependent Claim
20 words
The method of claim 1 wherein the anodic oxidation of the monomer ensues in the presence of a conducting salt.
Claim 8
Dependent Claim
38 words
The method of claim 6 wherein a plurality of piezo-ceramic components are joined to form a sandwich-like structure, the components being arranged in layers above one another at a defined spacing and interspaces are filled with a plastic.
Claim 9
Dependent Claim
19 words
The method of claim 1 wherein the interspaces are filled out by gluing the components to suitable plastic foils.
Claim 10
Dependent Claim
15 words
The method of claim 1 wherein the interspaces are filled by an injection molding method.
Claim 11
Dependent Claim
14 words
The method of claim 1 wherein the interspaces are filled with expanded cellular material.
Claim 12
Dependent Claim
70 words
A piezo-electric transducer having a composite structure, which comprises at least the following sequence of layers: ceramic, electrode, plastic, and which electrode material is an intrinsically conductive plastic and constructed from a monomer consisting of a compound chosen from the group of materials consisting of: five-membered heterocyclenes; aniline; azulene; derivatives of five-membered heterocyclenes, aniline, and azulene containing an element chosen from the group consisting of sulfur and nitrogen as heteroatom.
Claim 13
Dependent Claim
70 words
A piezo-electric transducer having a composite structure, which comprises at least the following sequence of layers: ceramic, electrode, plastic, and which electrode material is an intrinsically conductive plastic and constructed from a monomer consisting of a compound chosen from the group of materials consisting of: five-membered heterocyclenes; aniline; azulene; derivatives of five-membered heterocyclenes, aniline, and azulene containing an element chosen from the group consisting of sulfur and nitrogen as heteroatom.
Claim 14
Dependent Claim
14 words
The piezo-electric transducer of claim 11 wherein the monomer is polymerized by anodic oxidation.
Claim 15
Dependent Claim
21 words
The piezo-electric transducer of claim 12 wherein the anodic oxidation of the monomer ensues in the presence of a conducting salt.
Claim 16
Dependent Claim
24 words
The piezo-electric transducer of claim 13 wherein the conducting salt is chosen from the group consisting of organic sulfates, sulfonic acids, and inorganic salts.
Claim 17
Dependent Claim
14 words
The piezo-electric transducer of claim 11 wherein the monomer is polymerized by chemical oxidation.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-04-02 | 1993-10-02 | 1994-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-04-02 | 1997-10-02 | 1998-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-04-02 | 2001-10-02 | 2002-04-03 | $7700.00 | Window Closed / Lapsed |