EP0007436A1 - Transducteur électroacoustique avec une membrane munie d'une couche piézo-électrique - Google Patents

Transducteur électroacoustique avec une membrane munie d'une couche piézo-électrique Download PDF

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Publication number
EP0007436A1
EP0007436A1 EP79102027A EP79102027A EP0007436A1 EP 0007436 A1 EP0007436 A1 EP 0007436A1 EP 79102027 A EP79102027 A EP 79102027A EP 79102027 A EP79102027 A EP 79102027A EP 0007436 A1 EP0007436 A1 EP 0007436A1
Authority
EP
European Patent Office
Prior art keywords
membrane
socket
partition plate
passage openings
sound passage
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.)
Granted
Application number
EP79102027A
Other languages
German (de)
English (en)
Other versions
EP0007436B1 (fr
Inventor
Erwin Dipl.-Ing. Martin
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.)
Siemens AG
Original Assignee
Siemens AG
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 Siemens AG filed Critical Siemens AG
Priority to AT79102027T priority Critical patent/ATE1659T1/de
Publication of EP0007436A1 publication Critical patent/EP0007436A1/fr
Application granted granted Critical
Publication of EP0007436B1 publication Critical patent/EP0007436B1/fr
Expired 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; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R17/00—Piezoelectric transducers; Electrostrictive transducers
    • H04R17/02—Microphones
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
    • H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only 
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2499/00—Aspects covered by H04R or H04S not otherwise provided for in their subgroups
    • H04R2499/10—General applications
    • H04R2499/11—Transducers incorporated or for use in hand-held devices, e.g. mobile phones, PDA's, camera's

Definitions

  • the invention relates to an electroacoustic transducer with a transducer membrane arranged in a capsule, through which the volume in the capsule is divided into a diaphragm antechamber and a diaphragm rear space, furthermore with a socket, which closes the diaphragm antechamber and is provided with sound passage openings, wherein means for damping the Resonance peaks are provided.
  • the sensitivity should not continue to increase, since otherwise feedback between speech and hearing will occur at these frequencies capsule in the handset of a telephone are possible.
  • the frequency curve should drop steeply above 3500 Hz in order to avoid interference from adjacent channels when carrying carrier-frequency messages over long-distance lines (channel width 4 kHz).
  • the interference noise caused by the convolution in the speech signal should be suppressed
  • additional resonators and harmonics (DE-PS 1 961 217) are used, in particular the fourth partial oscillation characterized by a node circle.
  • the damping material directly behind the injection holes can be contaminated when the capsule is discussed. This changes the damping resistance over time and thus the frequency response and sensitivity of the microphone. Furthermore, cleaning the microphone capsule is hardly possible if the telephone is replaced. In addition, sticking the silk to the inside of the frame is relatively complex. Finally, the known damping devices behind the frame are usually not sufficient to dampen resonance peaks above 2000 Hz sufficiently.
  • a separating plate is arranged in the membrane antechamber between the membrane and the holder, and that both the holder and the separating plate are provided with sound passage openings; wherein the sound passage openings of the socket are arranged offset with respect to the sound passage openings of the partition plate, and in the area of the partition plate there are damping properties which cover the sound passage openings of the partition plate.
  • the low-pass filter thus formed can be adapted to a wide variety of requirements by varying the damping properties.
  • the sensitivity can be varied within certain limits without having to make changes to the membrane or its storage. May further include the cutoff frequency f o and the slope of the low pass Various - NEN needs to be adapted.
  • damping properties are provided in the space between the partition plate and the holder and / or in the space between the membrane and the partition plate, which partially fill this area.
  • the means having damping properties can advantageously be formed by a damping disc arranged in the holder.
  • a damping disc arranged in the holder.
  • the slope, cut-off frequency and damping can be varied.
  • the socket is provided with a cylindrical extension in which the damping disk provided with a central recess is mounted.
  • the holder and / or cutting disc has ribs facing the volume behind the sound passage openings and pointing radially outwards. As a result, additional resonances of plastic parts in the sound path can be reduced or excluded in a simple manner.
  • the carrier 2 which carries a circuit board 3 with electronic components on its side facing the bottom of the housing 1.
  • a circuit board 3 with electronic components on its side facing the bottom of the housing 1.
  • two contact blades are arranged (contact blades 4 shown) which protrude through recesses 5 of the housing, form the electrical connection to the outside and the carrier 2 with Defines circuit board 3 in the housing.
  • the carrier 2 is provided with two absorption resonators, of which the absorption resonator 6 covered with a silk disk 7 is shown.
  • a bearing body 8 is also arranged on the carrier 2, over which a transducer plate 10 provided with a piezoceramic layer 9 is supported. Another bearing body 11 forms the counter bearing.
  • the housing 1 is closed off by a partition plate 12 which is inseparably connected to the housing. This partition plate has a plurality of sound passage openings 13 arranged in a circle. Furthermore, the separating plate is provided on the side facing the membrane with radially outwardly extending ribs 14.
  • the transducer thus formed is closed by a socket 15, which in turn has sound passage openings 16 arranged in a circle. These sound passage openings are arranged in a circle with a larger diameter than the sound passage openings arranged in the partition plate.
  • a damping disc 17 is arranged between the partition plate and the holder, which is mounted in a cylindrical projection 18 of the holder and partially fills the space in front of the partition plate. The damping disc is dimensioned so that it covers the sound passage openings of the partition plate.
  • FIG. 2 shows a converter according to FIG. 1 in a schematic representation as a microphone.
  • the parts corresponding to FIG. 1 are given the same reference numerals.
  • the space between the removable socket 15 and the vibration system 8, 9, 10, 11 is divided by a partition plate 12 into two rooms V 3 and V 4 .
  • This acoustic oscillation structure corresponds electrically to a T-element acting as a low-pass filter (FIG. 3).
  • the cut-off frequency of the low-pass filter is set at the upper limit of the transmission range. The following applies to the cut-off frequency if one assumes the air masses in the openings of the socket and partition plate are the same size
  • a good low-pass effect can be achieved with channel lengths ⁇ 1 mm (possibly with an additional neck), which can be easily achieved with plastic injection molded parts for the socket and partition plate.
  • the attenuation must be sufficiently large so that the attenuation curve of the low-pass filter runs continuously from the passband to the stop band.
  • the acoustic frictional resistance r 3K and r 4 on the channel walls of the frame and partition plate H air flow resistance (prop ) is usually not sufficient for this.
  • the additional damping r 32 is realized here by a porous foam between the frame and the partition plate.
  • m 3Z represents the additional mass of the air enclosed in the porous material.
  • FIG. 3 shows the equivalent circuit diagram to FIG. 2.
  • section A means the handset being spoken to
  • section B the low-pass filter formed by the holder and separating plate
  • section C the mechanical and acoustic vibration system.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)
  • Details Of Audible-Bandwidth Transducers (AREA)
  • Obtaining Desirable Characteristics In Audible-Bandwidth Transducers (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
  • Telephone Set Structure (AREA)
EP79102027A 1978-07-17 1979-06-19 Transducteur électroacoustique avec une membrane munie d'une couche piézo-électrique Expired EP0007436B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT79102027T ATE1659T1 (de) 1978-07-17 1979-06-19 Elektroakustischer wandler mit piezoelektrischer schicht versehener membran.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2831411 1978-07-17
DE2831411A DE2831411C2 (de) 1978-07-17 1978-07-17 Elektroakustischer Wandler mit mit piezoelektrischer Schicht versehener Membran

Publications (2)

Publication Number Publication Date
EP0007436A1 true EP0007436A1 (fr) 1980-02-06
EP0007436B1 EP0007436B1 (fr) 1982-10-13

Family

ID=6044619

Family Applications (1)

Application Number Title Priority Date Filing Date
EP79102027A Expired EP0007436B1 (fr) 1978-07-17 1979-06-19 Transducteur électroacoustique avec une membrane munie d'une couche piézo-électrique

Country Status (11)

Country Link
US (1) US4292561A (fr)
EP (1) EP0007436B1 (fr)
JP (1) JPS596119B2 (fr)
AR (1) AR216604A1 (fr)
AT (1) ATE1659T1 (fr)
AU (1) AU524112B2 (fr)
BR (1) BR7904532A (fr)
DE (1) DE2831411C2 (fr)
GB (1) GB2025734B (fr)
IN (1) IN150914B (fr)
ZA (1) ZA793580B (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3007834A1 (de) * 1980-02-29 1981-09-17 Siemens AG, 1000 Berlin und 8000 München Elektroakustischer wandler
EP0118356A1 (fr) * 1983-03-07 1984-09-12 Thomson-Csf Transducteur électroacoustique à diaphragme piézoélectrique
EP0158230A1 (fr) * 1984-04-11 1985-10-16 Siemens Aktiengesellschaft Transducteur piézo-électrique-acoustique pour cellules électroacoustiques avec mise en oeuvre de construction pour l'assemblage
WO1986000188A1 (fr) * 1984-06-12 1986-01-03 Ottokar John Wolf Dispositif hygienique pour telephone
EP3169082A1 (fr) * 2015-10-20 2017-05-17 Sonion Nederland B.V. Ensemble microphone avec suppression de la réponse de fréquence

Families Citing this family (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3007773A1 (de) * 1980-02-29 1981-09-17 Siemens AG, 1000 Berlin und 8000 München Elektroakustischer wandler
DE3007808A1 (de) * 1980-02-29 1981-09-10 Siemens AG, 1000 Berlin und 8000 München Elektroakustischer wandler
DE3107344A1 (de) * 1981-02-26 1982-11-18 Siemens AG, 1000 Berlin und 8000 München Anordnung zur frequenzgangverbesserung von elektroakustischen wandlern
DE3127406C2 (de) * 1981-07-10 1986-03-27 Siemens Ag, 1000 Berlin Und 8000 Muenchen Modulationsvorrichtung zur optischen Signalübertragung
US4607186A (en) * 1981-11-17 1986-08-19 Matsushita Electric Industrial Co. Ltd. Ultrasonic transducer with a piezoelectric element
US4418248A (en) * 1981-12-11 1983-11-29 Koss Corporation Dual element headphone
US4413198A (en) * 1981-12-30 1983-11-01 Motorola, Inc. Piezoelectric transducer apparatus
EP0085194A1 (fr) * 1982-01-19 1983-08-10 Hugo R. Michiels Transducteur électro-acoustique
CA1202713A (fr) * 1984-03-16 1986-04-01 Beverley W. Gumb Emetteur sur combine telephonique
GB2164819B (en) * 1984-09-19 1988-09-28 Gibson Dawson Joseph Microphone
DE3518819A1 (de) * 1985-05-24 1986-11-27 Siemens AG, 1000 Berlin und 8000 München Elektroakustischer wandler
DE3602351C1 (de) * 1986-01-27 1986-12-11 Endress + Hauser GmbH + Co., 79689 Maulburg Schallwandlersystem
JPS63143621U (fr) * 1987-03-12 1988-09-21
JPS6427322U (fr) * 1987-08-11 1989-02-16
US4918738A (en) * 1988-12-05 1990-04-17 Federal Signal Corporation Structural assembly for housing an acoustical system
JPH0727715Y2 (ja) * 1989-02-06 1995-06-21 株式会社東芝 ハンドセット
WO2002052894A1 (fr) * 2000-12-22 2002-07-04 Brüel & Kjær Sound & Vibration Measurement A/S Transducteur capacitif micro-usine
JP4540659B2 (ja) * 2006-12-19 2010-09-08 岩崎通信機株式会社 送話器
JPWO2013183098A1 (ja) * 2012-06-06 2016-01-21 日本電気株式会社 スピーカ装置及び電子機器

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1036501A (fr) * 1950-05-11 1953-09-08 Filtre pour vibrations sonores et appareils en comportant application
DE1076182B (de) * 1957-02-21 1960-02-25 F & H Schumann G M B H Filteranordnung fuer elektro-akustische Wandler
DE1462228A1 (de) * 1965-09-30 1969-02-06 Siemens Ag Mikrofon
DE2256792A1 (de) * 1971-11-23 1973-05-30 Plessey Ducon Pty Ltd Daempfungseinrichtung fuer einen elektroakustischen wandler

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1069685B (de) * 1959-11-26 Wien Dipl.-Ing. Dr. techn. Walter Fiala Elektroakustischer W'andler mit Reibungshemmung
DE1288146B (de) * 1962-10-31 1969-01-30 Siemens Ag Elektroakustischer Wandler
BE759888A (fr) * 1969-12-05 1971-06-04 Siemens Ag Transducteur electro-acoustique, notamment microphone pour installations telephoniques
US3708702A (en) * 1970-12-02 1973-01-02 Siemens Ag Electroacoustic transducer
CH528197A (de) * 1971-12-20 1972-09-15 Ibm Gehäuseanordnung mit einem elektro-akustischen Wandler, und Verwendung derselben in einem Telefonapparat einer Nachrichtenübertragungsanlage mit PCM-Codierung

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1036501A (fr) * 1950-05-11 1953-09-08 Filtre pour vibrations sonores et appareils en comportant application
DE1076182B (de) * 1957-02-21 1960-02-25 F & H Schumann G M B H Filteranordnung fuer elektro-akustische Wandler
DE1462228A1 (de) * 1965-09-30 1969-02-06 Siemens Ag Mikrofon
DE2256792A1 (de) * 1971-11-23 1973-05-30 Plessey Ducon Pty Ltd Daempfungseinrichtung fuer einen elektroakustischen wandler

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3007834A1 (de) * 1980-02-29 1981-09-17 Siemens AG, 1000 Berlin und 8000 München Elektroakustischer wandler
EP0035220B1 (fr) * 1980-02-29 1984-06-13 Siemens Aktiengesellschaft Transducteur électroacoustique
EP0118356A1 (fr) * 1983-03-07 1984-09-12 Thomson-Csf Transducteur électroacoustique à diaphragme piézoélectrique
FR2542552A1 (fr) * 1983-03-07 1984-09-14 Thomson Csf Transducteur electroacoustique a diaphragme piezo-electrique
US4607145A (en) * 1983-03-07 1986-08-19 Thomson-Csf Electroacoustic transducer with a piezoelectric diaphragm
EP0158230A1 (fr) * 1984-04-11 1985-10-16 Siemens Aktiengesellschaft Transducteur piézo-électrique-acoustique pour cellules électroacoustiques avec mise en oeuvre de construction pour l'assemblage
WO1986000188A1 (fr) * 1984-06-12 1986-01-03 Ottokar John Wolf Dispositif hygienique pour telephone
EP3169082A1 (fr) * 2015-10-20 2017-05-17 Sonion Nederland B.V. Ensemble microphone avec suppression de la réponse de fréquence

Also Published As

Publication number Publication date
IN150914B (fr) 1983-01-15
AU524112B2 (en) 1982-09-02
AU4893179A (en) 1980-01-24
AR216604A1 (es) 1979-12-28
DE2831411C2 (de) 1983-10-06
ZA793580B (en) 1980-06-25
JPS5514800A (en) 1980-02-01
ATE1659T1 (de) 1982-10-15
JPS596119B2 (ja) 1984-02-09
BR7904532A (pt) 1980-04-08
GB2025734A (en) 1980-01-23
DE2831411A1 (de) 1980-01-31
GB2025734B (en) 1982-11-24
US4292561A (en) 1981-09-29
EP0007436B1 (fr) 1982-10-13

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