AU598754B2 - Means for electrically connecting electrodes on different surfaces of piezoelectric polymeric films - Google Patents
Means for electrically connecting electrodes on different surfaces of piezoelectric polymeric films Download PDFInfo
- Publication number
- AU598754B2 AU598754B2 AU63433/86A AU6343386A AU598754B2 AU 598754 B2 AU598754 B2 AU 598754B2 AU 63433/86 A AU63433/86 A AU 63433/86A AU 6343386 A AU6343386 A AU 6343386A AU 598754 B2 AU598754 B2 AU 598754B2
- Authority
- AU
- Australia
- Prior art keywords
- film
- lead
- leads
- conductive material
- channel
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
Links
- 239000004020 conductor Substances 0.000 claims description 33
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 14
- 230000000694 effects Effects 0.000 claims description 11
- 239000002184 metal Substances 0.000 claims description 8
- 229910052751 metal Inorganic materials 0.000 claims description 8
- 229920006254 polymer film Polymers 0.000 claims description 8
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 7
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims description 7
- 229910052802 copper Inorganic materials 0.000 claims description 7
- 239000010949 copper Substances 0.000 claims description 7
- 239000011159 matrix material Substances 0.000 claims description 7
- 229910052759 nickel Inorganic materials 0.000 claims description 7
- 229920000642 polymer Polymers 0.000 claims description 7
- 229910052709 silver Inorganic materials 0.000 claims description 7
- 239000004332 silver Substances 0.000 claims description 7
- 239000011248 coating agent Substances 0.000 claims description 6
- 238000000576 coating method Methods 0.000 claims description 6
- MIZLGWKEZAPEFJ-UHFFFAOYSA-N 1,1,2-trifluoroethene Chemical group FC=C(F)F MIZLGWKEZAPEFJ-UHFFFAOYSA-N 0.000 claims description 2
- BQCIDUSAKPWEOX-UHFFFAOYSA-N 1,1-Difluoroethene Chemical compound FC(F)=C BQCIDUSAKPWEOX-UHFFFAOYSA-N 0.000 claims description 2
- 229920001577 copolymer Polymers 0.000 claims description 2
- BFKJFAAPBSQJPD-UHFFFAOYSA-N tetrafluoroethene Chemical group FC(F)=C(F)F BFKJFAAPBSQJPD-UHFFFAOYSA-N 0.000 claims description 2
- 229920000131 polyvinylidene Polymers 0.000 claims 1
- 238000000034 method Methods 0.000 description 10
- 238000012216 screening Methods 0.000 description 7
- 238000000151 deposition Methods 0.000 description 5
- 239000002033 PVDF binder Substances 0.000 description 4
- 229920002981 polyvinylidene fluoride Polymers 0.000 description 4
- 238000005507 spraying Methods 0.000 description 4
- 238000010422 painting Methods 0.000 description 3
- 238000007639 printing Methods 0.000 description 2
- 230000002463 transducing effect Effects 0.000 description 2
- 229920002799 BoPET Polymers 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- SIKJAQJRHWYJAI-UHFFFAOYSA-N Indole Chemical compound C1=CC=C2NC=CC2=C1 SIKJAQJRHWYJAI-UHFFFAOYSA-N 0.000 description 1
- 229920006370 Kynar Polymers 0.000 description 1
- 239000005041 Mylar™ Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 239000007772 electrode material Substances 0.000 description 1
- 238000009713 electroplating Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 238000007641 inkjet printing Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- -1 polyethylene terephthalate Polymers 0.000 description 1
- 229920000139 polyethylene terephthalate Polymers 0.000 description 1
- 239000005020 polyethylene terephthalate Substances 0.000 description 1
- WQGWDDDVZFFDIG-UHFFFAOYSA-N pyrogallol Chemical compound OC1=CC=CC(O)=C1O WQGWDDDVZFFDIG-UHFFFAOYSA-N 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
- 238000001771 vacuum deposition Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N30/00—Piezoelectric or electrostrictive devices
- H10N30/01—Manufacture or treatment
- H10N30/06—Forming electrodes or interconnections, e.g. leads or terminals
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Piezo-Electric Transducers For Audible Bands (AREA)
Description
AUSTRALIA
Patents Act 598754 COMPLETE SPECIFICATION
(ORIGINAL)
Class Int. Class Application Number: L W I S Lodged: Complete Specification Lodged: Accepted: Published: Priority Related Art: 4laaodu~ntftra Ae indol SciOD ~g ftD$ te crrecl tri pzrxorlxz.
Name(s) of Applicant(s): Address(es) of Applicant(s): APPLICANT'S REF.: IR 2795 PENNWALT CORPORATION Pennwalt Building, Three Parkway, Philadelphia, Pennsylvania 19102, UNITED STATES OF AMERICA.
Peter Francis Radice Actual Inventor(s): Address for Service is: PHILLIPS, ORMONDE AND FITZPATRICK Patent and Trade Mark Attorneys 367 Collins Street Melbourne, Australia, 3000 Complete Specification for the invention entitled: "Means for Electrically Connecting Electrodes on Different Surfaces of Piezoelectric Polymeric Films" The following statement is a full description of this invention, including the best method of performing it known to applicant(s): P19/3/84 -lk "Means for Electrically Connecting Electrodes On Different Surfaces of Piezoelectric Polymeric Films" (IR 2795) Statement of the Invention This invention relates to piezoelectric transducers and more particularly to transducers employing polymeric film as the piezoelectric element wherein an electrode on one surface ri I of the film is quickly and easily electrically connected to an electrode on the opposite surface of the film or to an electrode deposited on a surface of another film, or to allow an electrical connection to be made to the opposite surface of the film.
Background and Summary of the Invention In the vast area of piezo film applications, it is necessary to have a means of detecting the charge or voltage produced by a piezo or pyro event. An electrode is needed on each side of the film for any application. Most such applications require the electrodes on opposite surfaces of the film to be electrically isolated from each other. Thus, care must be observed when depositing the electrodes on film surfaces to insure that metal migration does not occur over the edges of the film to result in possible shorting out of the electrodes. It is sometimes necessary however to electrically connect an electrode on one film surface with an electrode on the opposing film surface or to an electrode on the surface of another film to control capacitance or impedance; to effect a common electrical connection; to move a conductor from one film surface to another surface; to permit ease of lead attachment for termination, and the like.
According to the present invention there is provided a piezoelectric transducer comprising a piezoelectric polymer film, a ground electrode with a first lead deposited on one surface of -uid film, a signal generating electrode with a second lead deposited on the other surface of said film, said leads being deposited in staggered relationship on said film and extending substantially parallel to each other in the same direction, 00 said film having a channel provided therethrough, said o channel piercing one of said leads to form a pierced lead, conductive material affixed to said film over said channel to provide a linking lead on the opposite surface of said film to the surface carrying said pierced lead, said i conductive material coating sidewalls of said channel to effect continuity of said conductive material between said pierced lead and said linking lead, said conductive material being resilient, durable and ii- rubber-like and comprising a polymer matrix having a conductive metal embedded therein selected from the group consisting of silver, nickel and copper, said ground electrode Swith said first lead and said sigal generating electrode with said second lead consistinq of said conductive material, and means for connecting said linking lead and the other lead on the same surface of said film to electrical connectors.
The present invention further provides a piezoelectric transducer comprising a piezoelectric polymer film, a signal generating electrode deposited on each surface of said film, 1B L
C'
lB II a lead attached to each of said signal generating electrodes, said leads having portions thereof in aligned superposed relationship, means for electrically connecting said leads in series through said film, means for facilitating electrical connectjn--- aid leads by electrically disposjig-s-aidleads on the same surface of said E~_lm-r-saiad means comprising, said film having a channel piercing each of said aligned superposed leads to 'orm pierced leads, conductive material affixed to one of said pierced leads, said conductive material coating sidewalls of said channel to effect continuity of said conductive material between said pierced leads, said conductive material being resilient, durable and rubber-like and comprising a polymer matrix having a conductive metal embedded therein selected from the group consisting of silver, nickel and copper, said signal generating electrodes with said leads consisting of said conductive material, and means for connecting each of said signal generating electrodes to electrical connectors.
The present invention further provides a piezoelectric transducer comprising a pair of piezoelectric polymer films, each of said pair of films having an electrode with a lead deposited on one surface thereof, means for electrically disposinqg aid---leads~ n^ te same surface of-one-e-f- said films, said means comprising, one of said films having a channel provided therethrough 33 which pierces the lead on the other of said pair of films to form a pierced lead, conductive material affixed to said one film over said channel to provide a connecting lead on the surface of said film carrying the lead which remains unl.ierced, said conductive material coating sidewalls of saic channel to effect continuity of said conductive material between said pierced lead and said unpierced lead, said conductive material being resilient, durable and 39 rubber-like and comprising a polymer matrix having a
,KA
Le Ni IC conductive metal embedded therein selected from the group consisting of silver, nickel and copper, said electrodes and leads consisting of said conductive material.
i 0 i Id 2 i 3 38.~4105k ;u KA Vsk
KS
1D 1 ~L~ii i i
F-
0 -2electrically connect an electrode on one film surface .yi-h an electrode on the opposing film surface or to electrode on the surface of another film to cro capacitance or impedance; to effect a ommon electrical connection; to move a conductor o one film surface to another surface; to pe~-tease of lead attachment for termination, and the like.
The present invention provides a facile and convenient method for electrically connecting electrodes on opposing surfaces of a piezoelectric film by forming at least one hole or channel through the film as well as the lead to be electrically connected or linked to another surface. The hole may be formed by pin, punch, or laser, for example.
Then, by depositing conductive ink over the hole by silk-screening, for example, a portion of the ink will adhere to the hole sidewalls while penetrating the hole to effect the electrical connection with the pierced electrode.
If it is desired to electrically move an electrode from the surface of one film to the surface of another film, it is only necessary to align the films, pierce the film whose surface is to be linked to the already deposited electrode, and silk-screen conductive ink over the pierced hole or channel.
The invention is not intended to be limited to silk-screening processes for depositing a conductive ink over :k the hole, but may employ electrostatic printing and
I
F"'
L.-
I r, 1 s 3 xerography techniques, spraying, painting, ink jet printing, carbon particle deposition, and the like.
Brief Description of the Drawings FIG. 1 is a sectional view through a piezoelectric acoustic or vibration pick-up transducing device employing the "plated-through-hole" technique of the present invention.
FIG. 2 is a sectional view of FIG, 1 looking in the direction of arrows 2-2.
FIG. 3 is a sectional view of a portion of FIG. 2 taken 10 along line 3-3 thereof and including a plated-through-hole and resultant electrical connection made in accordance with the present invention.
FIC. 4 is a perspective view, part in phantom, of a piezoelectric transducer employing the plated-through-hole technique of the present invention.
FIGS. 5 and 6 are sectional views of FIG. 4 taken along lines 5-5 and 6-6 respectively, including components j! FIG. 7 is a view similar to FIG. 3 illustrating the electral "moving" of an electrode from one film to the surface of another film.
Detailed Description of the Invention Referring to FIGS 1, 2 and 3, a piezoelectric acoustic or vibration pick-up transducing device 10 is affixed to a guitar 12, for example, in vibration receiving relationship.
Vibration pick-up 10 comprises a piezoelectric polymeric film
~LI
~111 4- ,I 14, typically Kynar@, a polyvinylidene fluoride (PVDF) product of Pennwalt Corporation, Philadelphia, Pennsylvania, assignee of the present invention. The piezoelectric film 14 is provided with a ground electrode 16 and termination lead 18, both simultaneously deposited on an upper surface of the film, and a signal generating or detecting electrode 20 with termination lead 22 deposited on its lower surface. The electrodes 16 and 20 are deposited in substantial superposed relationship, unlike leads 18 and 22 which are staggered. An insulating film or sheet 24, typically Mylar, a polyethylene terephthalate resin film product of duPont, separates the signal generating electrode 20 from a grounding shield 26. A plastic protection laminate 28 embraces pick-up 10 except at its front end, where termination leads 18 and 22 extend.
Ground electrode 16, signal generating electrode 20, and leads 18 and 22 are preferably deposited on film 14 by a silk-screening process. The silk-screening conductive ink comprises a finely divided electrically conductive metal, suitably silver, nickel or copper, embedded within a polymer matrix. Shield 26 may be deposited on the undersurface of insulating sheet 24 by a silk-screening process, or by an electroplating process, vacuum deposition by evaporation or sputtering, and the like. Shield 26 insures against spurious voltages or radiation being picked up by acoustic transducer The laminated acoustic pick-up 10 may have a total thickness of about 6 to 8 mils. Thickness of piezoelectric film 14 may range between 61 to 110p, and preferably 20 to The insulating film 24 thickness may range between about 6 to 25p while the electrodes 16 and 20 and shield 26 thicknesses will typically be about 6-8p.
In order to facilitate connections to be made to leads 18 and 22, to permit connections to be readily made on the same film surface, reference is made to FIGS. 2 and 3 of the drawings wherein an electrically linking or connecting electrode 30 is formed on the upper surface of film 14, as is ground electrode 16 and lead 18. Linking electrode 30 is caused to become electrically connected to signal generating electrode 20 (FIG. 1) deposited on the lower surface of piezoelectric film 14. To that end, a hole or channel 32, typically a pin hole or punched-out hole, is provided through film 14 and lead 22. Linking electrode 30 is then formed over channel 32 by depositing or applying conductive ink 33 thereon by silk-screening, or spraying, painting, and the like.
More specifically, by silk-screening, spraying or printing, the linking electrode 30 on the film, a portion of the conductive ink or material 33 will penetrate nole 32 to contact lead 22 to fill, or partially fill hole 32, or at least to coat the walls thereof to thereby form an electrical connection between the signal generating electrode 20 on the m 6 lower surface of film 14 and the linking electrode 30 formed on the film's upperL surface.
The invention may be practiced by forming a plurality of pin holes and the like in lieu of a single hole and then plating through the holes as abovedescribed. Larger hole sizes, those approaching k inch in diameter, which expose more film 14 sidewall area than the area exposed by one or more pin holes result in electrical connections which are at least equally reliable to connections formed by the '0 single pin hole method. Ground electrode 16 and shield 26 are led to ground (not shown) by conventional means.
Referring now to FIG. 4 of the drawings, a piezoelectric transducer 40, such as an acoustic pick-up, includes an electrode deposited on each surface of a piezoelectric film, the electrodes being connected in series for controlling or matching impedance of the system. More specifically, ii transducer 40 includes a signal generating electrode 42 with ii termination lead 44 and connecting lead 46 deposited on an upper surface of piezoelectric film 14'. An identical electrode 48 with termination lead 50 and connecting lead 52 is deposited on the lower surface of film 14', shown by dotted lines. Electrodes 42 and 48 are deposited in staggered relationship and include shoulder portions 54 and 56 respectively. Connecting leads 46 and 52 are similarly staggered but turn inwardly in order that end portions of each become aligned and superimposed. Termination leads 44 t-4 -7and 50 may be brought to the same surface of film 14' by means described hereinabove.
A hole or channel 60 is provided through the end portions of connecting leads 46 and 52 as well as film 14', and a conductive ink 62 silk-screened, for example, over the upper signal generating electrode 42. Ink 62 penetrates hole 60 to contact electrode 48 on the lower surface of film 1 4' to effect a series connection between the electrodes. As mentioned above, ink 62 or suitable conductive material may 10 be applied by spraying, painting, and the like, and may fill, partially fill, or only coat the walls of hole or channel to thereby effect the desired electrical connection.
Similarly, a plurality of holes 60 may be provided along the end portions of the connecting leads as aforementioned.
In b G, 7, PVDF films 70 and 72 have electrodes 74 and 76 deposited on upper surfaces thereof respectively and it is desired to electrically "move" electrode 76 to the same surface of film 70 as is electrode 74. A hole or channel 78 is provided in film 70 which may then be coated or filled with a conductive ink or electrode material While the preferred piezoelectric polymeric film is PVDF, films made from copolymers of vinylidene fluoride and copolymerizable comonomers of tetrafluoroethylene and trifluoroethylene, for example, may be used advantageously with the present invention.
Claims (7)
1. A piezoelectric transducer comprising a piezoelectric polymer film, a ground electrode with a first lead deposited on one surface of said film, a signal generating electrode with a second lead deposited on the other surface of said film, said leads being deposited in staggered relationship on said film and extending substantially parallel to each other in the same direction, means for facilitating electrical connecti-on-s---to said leads by electrically disposing-said leads on the same surface of said .il-mi,-said means comprising,___ said film having a channel provided therethrough, said channel piercing one of said leads to form a pierced lead, conductive material affixed to said film over said channel to provide a linking lead on the opposite surface of said film to the surface carrying said pierced lead, said conductive material coating sidewalls of said channel to effect continuity of said conductive material between said pierced lead and said linking lead, said conductive material being resilient, durable and rubber-like and comprising a polymer matrix having a conductive metal embedded therein selected from the group S consisting of silver, nickel and copper, said ground electrode with said first lead and said signal generating electrode with said second lead consisting of said conductive material, and means for connecting said leads on said same surface f said film to electrical connectors.
2. A piezoelectric transducer comprising a ezoelectric polymer film, a signal generating electrode dep sted on each surface of said film, a lead attached to ea of said signal generating electrodes, said leads ing portions thereof in aligned superposed relationsh' means for ectrically connecting said leads in series through sai ilm, ns for facilitating electrical connections to said 39 1 s by electrically disposing said leads on the same surface 8 01 i l;i~ i ai 8a means for connecting said linking lead and the other lead on the same surface of said film to electrical connectors. 2. A piezoelectric transducer comprising a piezoelectric polymer film, a signal generating electrode deposited on each surface of said film, a lead attached to each of said signal generating electrodes, said leads having portions thereof in aligned superposed relationship, means for electrically connecting said leads in series through said film, ,1.1 AR -FI: of said film, said means eemrising, said film having a channel piercing each of said aligned superposed leads to form pierced leads, conductive material affixed to one of said pierced leads, said conductive material coating sidewalls of said channel to effect continuity of said conductive material between said pierced leads, said conductive material being resilient, durable and rubber-like and comprising a polymer matrix having a conductive metal embedded therein selected from the group consisting of silver, nickel and copper, said signal generating electrodes with said leads consisting of said conductive material, and means for connecting each of said signal generating electrodes to electrical connectors.
3. A piezoelectric transducer comprising a pair of piezoelectric polymer films, each of said pair of films having an electrode with a lead deposited on one surface thereof, means for electrically disposing said _aeaed-n--n-i sm surfa- _foe-o----s-id-fi-i-m, said means comprising, one of said films having a channel provided therethiough which pierces the lead on the other of said pair of films to form a pierced lead, conductive material affixed to said one film over said channel to provide a connecting lead on the surface of said film carrying the lead which remains unpierced, said conductive material coating sidewalls of said channel to effect continuity of said conductive material between said pierced lead and said unpierced lead, 0 said conductive material being resilient, durable and rubber-like and comprising a polymer matrix having a conductive metal embedded therein selected from the group consisting of silver, nickel and copper, said electrodes and leads consisting of said conductive material.
4. A transducer according to claim 2 wherein said signal generated electrodes are deposited in non-aligned or staggered relationship. A transducer according to any one of claims 1 to 4 39 wherein a plurality of channels is provided. cA 2, I; 9
6. A transducer according to any one of claims 1 to wherein said piezoelectric polymer film is selected from the group consisting of polyvinylidene -luoride, copolymers of vinylidene fluoride, and copolymerizable comonomers of tetrafluoroethylene and trifluoroethylene.
7. A piezoelectric transducer substantially as herein described with reference to the drawings. DATED: 14 March, 1990 CO C 0 00 4 PHILLIPS ORMONDE FITZPATRICK Attorneys for: PENNWALT CORPORATION 4104k
39. i- 10
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US06/745,986 US4633122A (en) | 1985-06-18 | 1985-06-18 | Means for electrically connecting electrodes on different surfaces of piezoelectric polymeric films |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| AU6343386A AU6343386A (en) | 1988-04-14 |
| AU598754B2 true AU598754B2 (en) | 1990-07-05 |
Family
ID=24999056
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU63433/86A Ceased AU598754B2 (en) | 1985-06-18 | 1986-10-02 | Means for electrically connecting electrodes on different surfaces of piezoelectric polymeric films |
Country Status (1)
| Country | Link |
|---|---|
| AU (1) | AU598754B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4734044A (en) * | 1986-04-18 | 1988-03-29 | Radice Peter F | Connectors for use with piezoelectric polymeric film transducers |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU7307887A (en) * | 1986-04-18 | 1987-11-09 | Atochem North America, Inc. | Piezoelectric transducer |
-
1986
- 1986-10-02 AU AU63433/86A patent/AU598754B2/en not_active Ceased
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU7307887A (en) * | 1986-04-18 | 1987-11-09 | Atochem North America, Inc. | Piezoelectric transducer |
Also Published As
| Publication number | Publication date |
|---|---|
| AU6343386A (en) | 1988-04-14 |
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