EP0264557A2 - Transducteur de son piézoélectrique - Google Patents

Transducteur de son piézoélectrique Download PDF

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Publication number
EP0264557A2
EP0264557A2 EP87111434A EP87111434A EP0264557A2 EP 0264557 A2 EP0264557 A2 EP 0264557A2 EP 87111434 A EP87111434 A EP 87111434A EP 87111434 A EP87111434 A EP 87111434A EP 0264557 A2 EP0264557 A2 EP 0264557A2
Authority
EP
European Patent Office
Prior art keywords
support ring
metal membrane
sound transducer
membrane
distance
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Withdrawn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
EP87111434A
Other languages
German (de)
English (en)
Other versions
EP0264557A3 (fr
Inventor
Gerd Bertl
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.)
Stettner and Co
Original Assignee
Stettner and Co
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 Stettner and Co filed Critical Stettner and Co
Publication of EP0264557A2 publication Critical patent/EP0264557A2/fr
Publication of EP0264557A3 publication Critical patent/EP0264557A3/fr
Withdrawn legal-status Critical Current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; 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
    • H04R17/00—Piezoelectric transducers; Electrostrictive transducers

Definitions

  • the invention relates to a piezoceramic sound transducer with a metal membrane, which carries a ceramic disc in the middle, and with a support ring molded onto the outer circumference of the membrane.
  • the outer circumference of the metal membrane carrying a ceramic disc is inserted between the two parts of a support ring made of plastic which are to be joined concentrically, and these are ultrasonically welded to one another.
  • a support ring made of plastic which are to be joined concentrically, and these are ultrasonically welded to one another.
  • This interference source is avoided in another sound transducer, however, in that the membrane or the like on the support ring with a silicone adhesive. is glued.
  • this production proves to be too expensive - especially since a piezoceramic transducer is a mass-produced item.
  • the support ring is therefore molded onto the metal membrane.
  • these inexpensively manufactured piezoceramic sound transducers both have a large oscillation frequency range and also meet the precision requirements, a disadvantageous side effect can also be seen here.
  • the cooling process of the plastic ring is considerable Shrinkage stresses that bulge the metal membrane in one direction. If, for example, the metal membrane is arched in the other direction due to external influences, undesirable tones are produced which have a very disruptive effect on the reproduction of the tones by the sound transducer.
  • the invention has for its object to design a piezoceramic transducer of the type mentioned in such a way that it is voltage-free and an improved reproduction quality of speech and sound sequences under inexpensive manufacturing conditions and while maintaining a large vibration frequency range is made possible.
  • the invention sees a solution to this problem in that the metal membrane has at least one concentric annular groove at a distance from the supporting ring.
  • the shrinkage stresses transferred to the membrane when the plastic support or assembly ring is cooled are shifted into the area of the metal membrane between the outermost channel and the said support ring, so that the area within the existing outermost channel is relaxed.
  • the ring-shaped grooves provide the metal membrane with a higher level of stiffening.
  • the invention provides that the groove (s) is / are stamped into the metal membrane after the support ring has been molded on, in order to achieve extremely simple and, at the same time, inexpensive manufacture.
  • the groove (s) is / are stamped into the metal membrane after the support ring has been molded on, in order to achieve extremely simple and, at the same time, inexpensive manufacture.
  • the embossing of the concentric annular channels is of different depths and - when using multiple channels - the distance of these channels from one another or from the support ring is different, which results in a considerable range of setting options for the signal transmitter .
  • the first embodiment 1 has a circular metal membrane 2, in the center of which a likewise circular thin ceramic plate 3 is arranged concentrically.
  • An annular groove-like indentation 4 is introduced into the membrane 2.
  • the groove 4 is located in the comparatively large distance 5 from the outer circumference 7 of the metal membrane 2 in this embodiment.
  • This arrangement is only exemplary.
  • the gutter 4 can of course also be located further out, approximately directly on the inner edge 8 of the support ring 9 receiving the membrane 2.
  • This support ring 9 is made of plastic and is injection molded onto the outer circumference of the metal membrane 2.
  • the diameter of the ceramic plate 3 corresponds approximately to that of the inner edge of the embossed channel 4.
  • the basic principle of the embodiment according to FIG. 2 corresponds to that according to FIG. 1. Only here the metal membrane 2 carrying the metal plate 3 has two channels 4 arranged at a distance 10 from one another.
EP87111434A 1986-08-27 1987-08-07 Transducteur de son piézoélectrique Withdrawn EP0264557A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3629093 1986-08-27
DE19863629093 DE3629093A1 (de) 1986-08-27 1986-08-27 Piezokeramischer schallwandler

Publications (2)

Publication Number Publication Date
EP0264557A2 true EP0264557A2 (fr) 1988-04-27
EP0264557A3 EP0264557A3 (fr) 1989-12-06

Family

ID=6308271

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87111434A Withdrawn EP0264557A3 (fr) 1986-08-27 1987-08-07 Transducteur de son piézoélectrique

Country Status (5)

Country Link
EP (1) EP0264557A3 (fr)
JP (1) JPS6367900A (fr)
KR (1) KR900006323B1 (fr)
DE (1) DE3629093A1 (fr)
IL (1) IL83648A0 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2232321A (en) * 1989-03-07 1990-12-05 Mitsubishi Mining & Cement Co Focusing piezoelectric transducer
GB2348564A (en) * 1999-04-01 2000-10-04 Thomson Marconi Sonar Limited An acoustic transducer for underwater use

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3360558B2 (ja) * 1997-01-06 2002-12-24 株式会社村田製作所 圧電型電気音響変換器

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR854121A (fr) * 1938-12-14 1940-04-05 Csf Perfectionnements aux appareils électromécaniques vibrants
DE1112548B (de) * 1960-02-01 1961-08-10 Krone Kg Sprechkapsel fuer fernmeldetechnische Zwecke
US4449019A (en) * 1980-11-10 1984-05-15 Murata Manufacturing Co., Ltd. Piezoelectric loudspeaker

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4056742A (en) * 1976-04-30 1977-11-01 Tibbetts Industries, Inc. Transducer having piezoelectric film arranged with alternating curvatures
FR2394512A1 (fr) * 1977-06-14 1979-01-12 Rhone Poulenc Ind Procede de separation d'acide acrylique a partir de ses solutions dans le phosphate de tri-n-butyle
DE3041742C2 (de) * 1980-11-05 1982-10-28 Siemens AG, 1000 Berlin und 8000 München Luftschallgeber

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR854121A (fr) * 1938-12-14 1940-04-05 Csf Perfectionnements aux appareils électromécaniques vibrants
DE1112548B (de) * 1960-02-01 1961-08-10 Krone Kg Sprechkapsel fuer fernmeldetechnische Zwecke
US4449019A (en) * 1980-11-10 1984-05-15 Murata Manufacturing Co., Ltd. Piezoelectric loudspeaker

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2232321A (en) * 1989-03-07 1990-12-05 Mitsubishi Mining & Cement Co Focusing piezoelectric transducer
GB2348564A (en) * 1999-04-01 2000-10-04 Thomson Marconi Sonar Limited An acoustic transducer for underwater use
US6404106B1 (en) 1999-04-01 2002-06-11 Thales Underwater Systems Limited Pressure tolerant transducer
GB2348564B (en) * 1999-04-01 2003-06-18 Thomson Marconi Sonar Ltd Transducers
EP1041537A3 (fr) * 1999-04-01 2004-12-01 Thales Underwater Systems Limited Transducteur tolérant à la pression

Also Published As

Publication number Publication date
DE3629093A1 (de) 1988-03-10
KR900006323B1 (ko) 1990-08-28
JPS6367900A (ja) 1988-03-26
KR880003535A (ko) 1988-05-17
EP0264557A3 (fr) 1989-12-06
IL83648A0 (en) 1988-01-31

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Inventor name: BERTL, GERD