WO1986004477A1 - Transducteur electromecanique - Google Patents

Transducteur electromecanique Download PDF

Info

Publication number
WO1986004477A1
WO1986004477A1 PCT/GB1986/000038 GB8600038W WO8604477A1 WO 1986004477 A1 WO1986004477 A1 WO 1986004477A1 GB 8600038 W GB8600038 W GB 8600038W WO 8604477 A1 WO8604477 A1 WO 8604477A1
Authority
WO
WIPO (PCT)
Prior art keywords
layers
pin
electro
transducer
conductive
Prior art date
Application number
PCT/GB1986/000038
Other languages
English (en)
Inventor
Thomas Griffith Jones
Original Assignee
Thomas Griffith Jones
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Thomas Griffith Jones filed Critical Thomas Griffith Jones
Publication of WO1986004477A1 publication Critical patent/WO1986004477A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R17/00—Piezoelectric transducers; Electrostrictive transducers
    • H04R17/005—Piezoelectric transducers; Electrostrictive transducers using a piezoelectric polymer

Definitions

  • the present invention relates to an electro-mechanical transducer.
  • Electro-mechanical transducers such as microphones, are often used with musical instruments to detect the audio frequency waves generated by the instrument and convert these to an electrical signal which can then be amplified to amplify the sound of the musical instrument.
  • the microphone is in the form of a pick-up mounted on the body of the guitar.
  • the present invention seeks to provide an improved form of electro-mechanical transducer.
  • the present invention provides an electro-mechanical transducer comprising two layers of a polarised piezoelectric polymer coated on each face with a conductive layer, the said layers being arranged with conductive layers of one polarity facing one another, and wherein the outer conductive layers of the transducer are interconnected to form a screen and the inner conductive layers are interconnected to form a signal source.
  • Figure 1 is a diagrammatic view of an electro-mechanical transducer according to the present invention.
  • Figure 2 is a section along the line 2-2 of the transducer of Figure 1, and
  • Figure 3 is a section on the line 3-3 of Figure 1 showing a preferred form of electrical connection to the transducer.
  • FIG. 1 is a diagrammatic view of a preferred form of, electro-mechanical transducer 10 according to the invention, in which a piezoelectric device 12 is. conveniently enclosed for protection in a plastics material sheath 14. The latter is conveniently moulded about the device and is formed of, for example, polyvinyl chloride. An external cable 16 is connected to the piezoelectric device 12, the junction being protected by an injection moulding 18 conveniently of ther o plastics material.
  • the piezoelectric device itself is shown in cross section in Figure 2 and comprises two layers 20 of a polarised piezoelectric polymer, each face of each layer being coated with a conductive material 22.
  • the two layers 20 are arranged back to back, that is with their positively charged conductive coatings 22 adjacent, the two layers being secured together by means of a layer of double-sided adhesive tape 24 which may be ther oadhesive or self adhesive
  • the outer, negatively charged conductive coatings 22 are protected by respective layers 26 of insulating material with the whole of the device conveniently enclosed in a protective sheath 28, conveniently of plastics material.
  • the two outer, negatively charged conductive coatings 22 are connected together and to earth conveniently through the earth. shield of conductor 16 while the two positively charged conductive coatings are connected to the signal output wire of the cable 16.
  • the piezoelectric polymer which is used is conveniently polyvinylidene fluoride (PVdF) which is both piezoelectric and pyroelectric, conveniently in thin film form.
  • the outer conductive coatings when connected to earth form an electro-magnetic and electro-static screen around the two inner conductive coatings forming the signal source.
  • the effect of this configuration is to increase the output signal provided by the piezoelectric device and also to provide a built-in conductive shield which considerably reduces extraneous and unwanted spurious signals which could otherwise be generated in the device due to external fluctuating electro-magnetic and electro-static fields.
  • the device since the device is piezoelectric in operation no external power source is required.
  • Figure 3 shows a preferred way of connecting the piezoelectric device 12 to the external cable 16.
  • two electically conductive connecting pins 30, 32 pierce the two polymer layers 20 and tape 24 so that the ends of the pins project slightly above the adjacent conductive coating 22 and are secured to respective connectors 34.
  • the pins 32 are located on respective sides of the device 12 in the end region adjacent the cable 16, the protective sheath 28 being omitted from the drawing for clarity.
  • the pin 30 as shown in the drawing connects the inner conductive coatings 22 to the inner wire of cable 16 while the pin 32 connects the outer conductive coatings 22 to the screen of cable 16.
  • the two outer conductive coatings 22 are removed in the region of the connectors 34 of pin 30 while the two inner conductive coatings are removed in the region of pin 32 in order to ensure electrical isolation of the two pins.
  • pin 32 passes through the inner conductive coatings 22 at right-angles in order to ensure a good electrical connection with the coatings the latter are thickened at the locations where they are pierced by pin 30 by the addition of one or more layers of conductive ink. This is sufficient to ensure a sound connection of the inner coatings 22 with the pin 30.
  • the connectors 34 may be crimped, soldered or otherwise connected to the pins and, in the case of pin 32, to the outer conductive layers 22.
  • a conductive adhesive may also be used.
  • the outer conductive coating 22 may also be thickened by the addition of a conductive ink in like manner to that for pin 30 in order to provide an effective electrical connection between pin 32 and the outer conductive coatings.
  • the device In use, when used as for example, a pick up for a musical instrument such as a guitar, the device is attached to the body of the guitar and senses mechanical vibrations of the instrument which are transmitted both through the body of the instrument and through the air to the piezoelectric device.
  • these can be formed in any suitable manner such as metalising and can comprise any suitable metal such as aluminium.

Abstract

Un transducteur électromécanique possède deux couches (20) d'un polymère piézoélectrique polarisé recouvert sur chaque face d'un revêtement conducteur (22). Les deux couches sont arrangées dos à dos et fixées par une bande adhésive double-face (24), leurs revêtements conducteurs chargés positivement étant orientés l'un contre l'autre. Des couches protectrices (26) d'isolation et une gaine protectrice (28) sont prévues. Les revêtements conducteurs internes sont reliés par une broche (30) traversant les couches polymères, le revêtement conducteur externe étant absent à proximité de la broche. Les revêtements conducteurs externes également sont reliés par une broche (32), et la connexion avec un câble externe blindé est réalisée par ces broches, la broche (32) étant reliée au blindage externe du câble et la broche (30) au câble interne de signal. Etant donné que le dispositif est piézoélectrique, aucune alimentation en courant n'est nécessaire et l'interconnexion des deux revêtements internes conducteurs améliore le signal produit par le dispositif, tandis que les deux revêtements externes forment un blindage électromagnétique et électrostatique réduisant les signaux parasites étrangers et indésirés qui pourraient troubler le fonctionnement du dispositif.
PCT/GB1986/000038 1985-01-21 1986-01-21 Transducteur electromecanique WO1986004477A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB858501475A GB8501475D0 (en) 1985-01-21 1985-01-21 Electro-mechanical transducer
GB8501475 1985-01-21

Publications (1)

Publication Number Publication Date
WO1986004477A1 true WO1986004477A1 (fr) 1986-07-31

Family

ID=10573163

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1986/000038 WO1986004477A1 (fr) 1985-01-21 1986-01-21 Transducteur electromecanique

Country Status (4)

Country Link
EP (1) EP0210214A1 (fr)
AU (1) AU5354886A (fr)
GB (2) GB8501475D0 (fr)
WO (1) WO1986004477A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1992018256A1 (fr) * 1991-04-20 1992-10-29 Jones Richard W Dispositif de generation d'ondes acoustiques

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH587595A5 (fr) * 1974-05-30 1977-05-13 Plessey Handel Investment Ag
US4166229A (en) * 1978-02-23 1979-08-28 The United States Of America As Represented By The Secretary Of The Navy Piezoelectric polymer membrane stress gage
DE2944506A1 (de) * 1978-11-05 1980-05-08 Ngk Spark Plug Co Piezoelektrischer wandler fuer elektrische saiteninstrumente und diesen enthaltende tonabnehmer
JPS58156299A (ja) * 1982-03-12 1983-09-17 Toshiba Corp 多層高分子トランスジユ−サ
US4475014A (en) * 1982-09-13 1984-10-02 Harman-Motive Inc. Acoustical transducer

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH587595A5 (fr) * 1974-05-30 1977-05-13 Plessey Handel Investment Ag
US4166229A (en) * 1978-02-23 1979-08-28 The United States Of America As Represented By The Secretary Of The Navy Piezoelectric polymer membrane stress gage
DE2944506A1 (de) * 1978-11-05 1980-05-08 Ngk Spark Plug Co Piezoelektrischer wandler fuer elektrische saiteninstrumente und diesen enthaltende tonabnehmer
JPS58156299A (ja) * 1982-03-12 1983-09-17 Toshiba Corp 多層高分子トランスジユ−サ
US4475014A (en) * 1982-09-13 1984-10-02 Harman-Motive Inc. Acoustical transducer

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, Volume 7, No. 276 (E-215) (1421), 9 December 1983 & JP,A,58 156299 (Tokyo Shibaura Denki K.K.) 17 September 1983 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1992018256A1 (fr) * 1991-04-20 1992-10-29 Jones Richard W Dispositif de generation d'ondes acoustiques

Also Published As

Publication number Publication date
AU5354886A (en) 1986-08-13
GB8622675D0 (en) 1986-10-22
GB2181621B (en) 1989-07-19
GB2181621A (en) 1987-04-23
GB8501475D0 (en) 1985-02-20
EP0210214A1 (fr) 1987-02-04

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