EP0201421A1 - Körperschallaufnehmer mit einer piezopolymeren Membran - Google Patents

Körperschallaufnehmer mit einer piezopolymeren Membran Download PDF

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Publication number
EP0201421A1
EP0201421A1 EP86400958A EP86400958A EP0201421A1 EP 0201421 A1 EP0201421 A1 EP 0201421A1 EP 86400958 A EP86400958 A EP 86400958A EP 86400958 A EP86400958 A EP 86400958A EP 0201421 A1 EP0201421 A1 EP 0201421A1
Authority
EP
European Patent Office
Prior art keywords
piezoelectric
grooves
contact sensor
membrane
polymer film
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.)
Withdrawn
Application number
EP86400958A
Other languages
English (en)
French (fr)
Inventor
Bruno De Fleurieu
José Cherqui
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Societe Industrielle de Liaisons Electriques SA
Original Assignee
Societe Industrielle de Liaisons Electriques SA
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 Societe Industrielle de Liaisons Electriques SA filed Critical Societe Industrielle de Liaisons Electriques SA
Publication of EP0201421A1 publication Critical patent/EP0201421A1/de
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/46—Special adaptations for use as contact microphones, e.g. on musical instrument, on stethoscope
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R17/00—Piezoelectric transducers; Electrostrictive transducers
    • H04R17/02—Microphones
    • H04R17/025—Microphones using a piezoelectric polymer

Definitions

  • the present invention relates to a piezoelectric contact microphone.
  • This sensor can be used as a laryngophone and as a bone or mechanical solidary vibration sensor.
  • the operation of the present invention will be described in its use as a bone vibration sensor when it is placed on the head at the top of the speaker's cranial box, the other uses being deduced in an obvious manner.
  • the transducer object of the present invention allows the transmission of the speech of a subject placed in unfavorable environmental conditions. It sometimes happens that in various circumstances it is not possible to use an ordinary proximity microphone.
  • the object of the invention is therefore a sensor contact microphone comprising a polymer piezo membrane with metallized faces disposed between a thin plastic plate and a plate acting as an "anvil", both provided with grooves on their facing faces which concentrically stretch the polymer piezo film and a electronic preamplifier circuit, characterized in that said membrane consists of a piezo-polymer film, the two faces of which are metallized forming the armatures of a capacitor so that the potential difference which is established between the two armatures constitutes the signal sent to the amplifier and from there to the outside, and also characterized in that the said membrane is slightly pretended by the grooves of the facing plastic plates.
  • the vibrations of the skull bones generated by the subject's voice are transmitted to the external hard plastic wafer.
  • This external plate being slightly projecting relative to the housing and having a thinned peripheral zone, moves around its rest position during vibrations.
  • the grooves of the two plates are offset, so that the projecting grooved part of the external plate, comes to fit in the groove of the groove of the internal plate and vice versa which keeps the piezo polymer film in permanent contact with the two plates.
  • any impulse transmitted by the cranial bone tends to push the projecting part into the groove of the internal plate which produces a deformation of the piezoelectric film.
  • this deformation generates electric charges on the faces of the piezo polymer film.
  • These charges collected by the metal faces of the film, create a potential difference, across the terminals of the polarized solid dielectric capacitor that constitutes the film used, which is amplified by the preamplifier built into the transducer.
  • the signal is then sent outside of said transducer.
  • the plastic plate situated outside 2 can be protected against any external attack as well as for reasons of comfort by a thin layer of protective material (rubber for example).
  • the invention may be better understood by referring to an exemplary embodiment which is in no way limitative in which the sensor assumes the cylindrical shape and in which the grooves of the two plates are concentric circles and which will be described below with reference to the figure. unique.
  • the piezo polymer film 5 with metallized faces 4 and 6 is held on the metal ring 7 of the lower plate 8 (provided with circular grooves 13) by the ring 7. Then stacked successively in the casing 1, the upper plate 2 (provided circular grooves 14), the piezo-polymer film assembly, housing, lower plate described above, a metal spacer 9 containing the preamplifier 11 and a closure part 10 pierced with holes 12 for the output of the conductors from the amplifier which transmit the signal received to the outside.
  • the sensitive piezo polymer film used consists of a piezoelectric polymer layer 5, each of the faces of which is metallized 4 and 6.
  • a vibration propagates through the bones of the skull and induces a displacement of the plate 2 and its projecting parts 14 relative to the part (8 with grooves 13) serving as anvil.
  • a series of sounds corresponding to a sentence will correspond to a succession of electrical signals.
  • the signal thus obtained will be too weak to be used directly.
  • This signal is therefore directed to a correcting preamplifier with very high input impedance.
  • the signal from the preamplifier will be taken by conductors passing through the closure plate through one or two openings such as 12.
  • the sensitive layer is constituted by a piezoelectric polymer film of the polyvinylfluoride type. It will have a thickness of a few tens of microns. Films of this type are found commercially covered on both sides with a metallized layer (AR, Ni, Au, etc.) having very satisfactory adhesion to the polymer in most cases.
  • a metallized layer AR, Ni, Au, etc.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Piezo-Electric Transducers For Audible Bands (AREA)
EP86400958A 1985-05-02 1986-04-30 Körperschallaufnehmer mit einer piezopolymeren Membran Withdrawn EP0201421A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8506663 1985-05-02
FR8506663A FR2581496B1 (fr) 1985-05-02 1985-05-02 Capteur microphonique de contact a membrane piezo polymere

Publications (1)

Publication Number Publication Date
EP0201421A1 true EP0201421A1 (de) 1986-11-12

Family

ID=9318883

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86400958A Withdrawn EP0201421A1 (de) 1985-05-02 1986-04-30 Körperschallaufnehmer mit einer piezopolymeren Membran

Country Status (2)

Country Link
EP (1) EP0201421A1 (de)
FR (1) FR2581496B1 (de)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3623587A1 (de) * 1986-07-12 1988-01-21 Gerd Kress Geraet zum messen der betriebszeit von maschinen
EP0334219A3 (de) * 1988-03-21 1991-04-03 M-P & SD DI-PARISI EUGENIO MARKETING PROMOTION & SYSTEMS DEVELOPMENT Kontaktmikrophon
EP0390758A3 (de) * 1989-03-06 1991-11-13 Leif Palmaer Kontaktmikrophon-Verstärker
WO1995006525A1 (en) * 1993-08-30 1995-03-09 Medacoustics, Inc. Disposable acoustic pad sensors
WO2000010462A1 (en) * 1998-08-20 2000-03-02 Medacoustics, Inc. Thin film piezoelectric polymer sensor
US6193668B1 (en) 1997-11-10 2001-02-27 Medacoustics, Inc. Acoustic sensor array for non-invasive detection of coronary artery disease
US6243599B1 (en) 1997-11-10 2001-06-05 Medacoustics, Inc. Methods, systems and computer program products for photogrammetric sensor position estimation
US20100290660A1 (en) * 2008-02-08 2010-11-18 Temco Japan Co., Ltd. Vibration pickup microphone
CN1997243B (zh) * 2005-12-31 2011-07-27 财团法人工业技术研究院 可挠式扬声器及其制法
WO2018104807A1 (en) * 2016-12-05 2018-06-14 Sateco Ag Button assemblies

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3816774A (en) * 1972-01-28 1974-06-11 Victor Company Of Japan Curved piezoelectric elements
NL7508534A (en) * 1975-07-17 1977-01-19 Philips Nv Transducer for loudspeakers or microphones - provided with independently acting but adjacently located transducer membrane films
US4056742A (en) * 1976-04-30 1977-11-01 Tibbetts Industries, Inc. Transducer having piezoelectric film arranged with alternating curvatures
DE3022770A1 (de) * 1980-06-18 1981-12-24 Helmut 8501 Feucht Schaller Piezokeramischer tonabnehmer
FR2507424A1 (fr) * 1981-06-05 1982-12-10 Cgr Transducteur piezoelectrique autocollant et dispositif de mise en oeuvre du transducteur

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3816774A (en) * 1972-01-28 1974-06-11 Victor Company Of Japan Curved piezoelectric elements
NL7508534A (en) * 1975-07-17 1977-01-19 Philips Nv Transducer for loudspeakers or microphones - provided with independently acting but adjacently located transducer membrane films
US4056742A (en) * 1976-04-30 1977-11-01 Tibbetts Industries, Inc. Transducer having piezoelectric film arranged with alternating curvatures
DE3022770A1 (de) * 1980-06-18 1981-12-24 Helmut 8501 Feucht Schaller Piezokeramischer tonabnehmer
FR2507424A1 (fr) * 1981-06-05 1982-12-10 Cgr Transducteur piezoelectrique autocollant et dispositif de mise en oeuvre du transducteur

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3623587A1 (de) * 1986-07-12 1988-01-21 Gerd Kress Geraet zum messen der betriebszeit von maschinen
EP0334219A3 (de) * 1988-03-21 1991-04-03 M-P & SD DI-PARISI EUGENIO MARKETING PROMOTION & SYSTEMS DEVELOPMENT Kontaktmikrophon
EP0390758A3 (de) * 1989-03-06 1991-11-13 Leif Palmaer Kontaktmikrophon-Verstärker
WO1995006525A1 (en) * 1993-08-30 1995-03-09 Medacoustics, Inc. Disposable acoustic pad sensors
US5885222A (en) * 1993-08-30 1999-03-23 Medacoustics, Inc. Disposable acoustic pad sensors
US6193668B1 (en) 1997-11-10 2001-02-27 Medacoustics, Inc. Acoustic sensor array for non-invasive detection of coronary artery disease
US6243599B1 (en) 1997-11-10 2001-06-05 Medacoustics, Inc. Methods, systems and computer program products for photogrammetric sensor position estimation
WO2000010462A1 (en) * 1998-08-20 2000-03-02 Medacoustics, Inc. Thin film piezoelectric polymer sensor
US6278890B1 (en) 1998-11-09 2001-08-21 Medacoustics, Inc. Non-invasive turbulent blood flow imaging system
CN1997243B (zh) * 2005-12-31 2011-07-27 财团法人工业技术研究院 可挠式扬声器及其制法
US20100290660A1 (en) * 2008-02-08 2010-11-18 Temco Japan Co., Ltd. Vibration pickup microphone
WO2018104807A1 (en) * 2016-12-05 2018-06-14 Sateco Ag Button assemblies
US11025251B2 (en) * 2016-12-05 2021-06-01 Sateco Ag Button assemblies

Also Published As

Publication number Publication date
FR2581496B1 (fr) 1987-06-26
FR2581496A1 (fr) 1986-11-07

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Inventor name: DE FLEURIEU, BRUNO

Inventor name: CHERQUI, JOSE