EP0354520A2 - Transducteur électro-acoustique - Google Patents

Transducteur électro-acoustique Download PDF

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Publication number
EP0354520A2
EP0354520A2 EP89114587A EP89114587A EP0354520A2 EP 0354520 A2 EP0354520 A2 EP 0354520A2 EP 89114587 A EP89114587 A EP 89114587A EP 89114587 A EP89114587 A EP 89114587A EP 0354520 A2 EP0354520 A2 EP 0354520A2
Authority
EP
European Patent Office
Prior art keywords
bearing
electroacoustic transducer
transducer according
bearing body
areas
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
EP89114587A
Other languages
German (de)
English (en)
Other versions
EP0354520B1 (fr
EP0354520A3 (fr
Inventor
Gerd Böhnke
Stefan Pieper
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
Siemens Corp
Original Assignee
Siemens AG
Siemens Corp
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, Siemens Corp filed Critical Siemens AG
Priority to AT8989114587T priority Critical patent/ATE104823T1/de
Publication of EP0354520A2 publication Critical patent/EP0354520A2/fr
Publication of EP0354520A3 publication Critical patent/EP0354520A3/fr
Application granted granted Critical
Publication of EP0354520B1 publication Critical patent/EP0354520B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • H04R17/00—Piezoelectric transducers; Electrostrictive transducers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; 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 circular transducer plate arranged in a transducer housing and clamped between bearing bodies in the edge region and provided with a piezoelectric layer, in particular for telephone sets.
  • one of the tasks to be solved in the manufacture of electroacoustic transducers is to ensure that the relationship between the acoustic parameters of the sound field and the electrical variables of the transducer in the transmission range is largely frequency-independent.
  • the frequency dependency of the relationship between the parameters of the sound field and the electrical variables of the transducer is determined in particular by the frequency dependency of the vibratory mechanical structure consisting of the membrane and the coupled air spaces or the like.
  • the membranes of high quality sound receivers e.g. of condenser microphones are clamped and arranged in such a way that the resonance frequency corresponding to their fundamental vibration lies far above the frequency range of interest, so that the relationship between the deflection of the membrane and the parameters of the sound field in this frequency range is practically frequency-independent.
  • Newer piezoelectric transducers have, instead of the usual membrane, a transducer plate which is clamped between bearing bodies in their edge area and which is provided with a piezoelectric layer. If such a plate is then excited electrically or acoustically, pronounced peaks form on the plate depending on the measured sound pressure and frequency, which can be made visible by holographic interferometry and which are characterized by circular node lines and node diameters.
  • the elevations which are distinguished by the node diameter play no role.
  • the circular node lines are essential.
  • the partial vibration characterized by the 1st circular node line can be dampened by two ⁇ / 2 resonators (DE-PS 1 167 897).
  • the partial oscillation marked by the second circular node line was not dampened in the past because it did not fall within a tolerance scheme specified by the postal administrations. However, due to the expansion of the tolerance range from 8 kHz to 10 kHz, this partial oscillation led to the tolerance range being exceeded, so that it must now be damped.
  • This partial oscillation could be damped with a broadband Helmholtz resonator, which, however, can be arranged only with difficulty in the existing converter housing.
  • the object of the invention is to carry out the damping of the partial vibration characterized by two circular node lines with the simplest possible means.
  • At least one bearing area of a bearing body has a rotationally asymmetrical shape.
  • the transducer plate which vibrates with its natural frequency, generates a sound pressure level that can lie between a pronounced increase in sound pressure and a drop in sound pressure.
  • the sound pressure that arises is the result of the partial-phase vibrating partial surfaces. They each displace volumes that compensate for an effectively displaced volume. To a good approximation, the effectively displaced volume is proportional to the sound pressure.
  • the basic resonance generates the maximum sound pressure of all natural frequencies, because no sub-areas vibrate in opposite phases. If it is now possible to make the out-of-phase displaced volumes equal for ⁇ ⁇ 1, the sound pressure generated must ver dwindle (damping).
  • the modification of the converter plate bearings according to the invention has now made it possible to bring the volumes oscillating in opposite phases into the same order of magnitude.
  • the basic resonance remains relatively unaffected.
  • the invention now advantageously shows a way of avoiding complex resonators for damping partial vibrations.
  • tests can be used to determine how the rotationally asymmetrical shape of the bearing should be designed.
  • the two bearing bodies may have a rotationally asymmetrical shape and to be arranged opposite the transducer plate in such a way that the bearing areas lie opposite one another.
  • bearing body may also be expedient for the bearing body to be formed by a first concentric ring (ring-shaped extension) which splits into two partial rings in one sector.
  • the support areas can be formed by pointed bearings. To dampen the partial vibrations, it has been found that it is expedient if the bearing areas of the bearing bodies are formed by flat surfaces.
  • the bearing body are integrally formed with the housing parts.
  • the converter shown in FIG. 1 has a lower housing part 1, into which a carrier 2 is inserted.
  • a resonator ring 3 is arranged above the carrier 2.
  • the converter housing is closed by a cover 4 which has sound passage openings 5.
  • the piezoelectric layer here has electrodes, not shown, which are guided to connectors (connector 8 shown) via tapes or the like.
  • a Helmholtz resonator 9 connects the anteroom of the support 2 with the rear area and serves to dampen the basic resonance.
  • the converter plate 6 is firmly clamped in its edge area.
  • Bearing bodies are used for this purpose, which consist of cylindrical annular projections 10 to 15 of the carrier 2 and of the resonator ring 3.
  • the carrier was shown in separate figures.
  • the carrier according to FIGS. 2 and 3 was shown rotated by 180 ° in relation to the representation in FIG.
  • the support areas for the transducer plate which are formed by annular cylindrical projections, are now clearly recognizable. That's how it is initially the annular extension 16 can be seen, which splits into two partial rings 17, 18 in the left image plane.
  • the support area for the converter plate thus has a rotationally asymmetrical shape.
  • the contact area of the resonator ring is designed similarly.
  • the term resonator ring was chosen because there can be two ⁇ / 2 resonators in it.
  • the 4 shows the frequency response of the converter.
  • the ordinate means the sensitivity E in dB, the abscissa the frequency in Hertz.
  • Lines 19, 20 delimit the tolerance range between which the frequency curve is to be located.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Piezo-Electric Transducers For Audible Bands (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
EP89114587A 1988-08-10 1989-08-07 Transducteur électro-acoustique Expired - Lifetime EP0354520B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT8989114587T ATE104823T1 (de) 1988-08-10 1989-08-07 Elektroakustischer wandler.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3827165 1988-08-10
DE3827165 1988-08-10

Publications (3)

Publication Number Publication Date
EP0354520A2 true EP0354520A2 (fr) 1990-02-14
EP0354520A3 EP0354520A3 (fr) 1991-04-03
EP0354520B1 EP0354520B1 (fr) 1994-04-20

Family

ID=6360604

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89114587A Expired - Lifetime EP0354520B1 (fr) 1988-08-10 1989-08-07 Transducteur électro-acoustique

Country Status (6)

Country Link
US (1) US5030872A (fr)
EP (1) EP0354520B1 (fr)
JP (1) JPH0281600A (fr)
CN (1) CN1015289B (fr)
AT (1) ATE104823T1 (fr)
DE (1) DE58907495D1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0483559A3 (en) * 1990-10-30 1993-04-14 Siemens Aktiengesellschaft Handset structure for telephone sets

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5406161A (en) * 1994-05-24 1995-04-11 Industrial Technology Research Institute Piezoelectric composite receiver
WO2007054919A1 (fr) * 2005-11-14 2007-05-18 Nxp B.V. Systeme de deplacement asymetrique pour un haut-parleur piezoelectrique et haut-parleur asymetrique

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL267294A (fr) * 1960-07-22
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
US3872470A (en) * 1973-04-18 1975-03-18 Airco Inc Audible signal generating apparatus having selectively controlled audible output
US4302695A (en) * 1979-11-16 1981-11-24 General Electric Company Support arrangement for a flexible sound generating diaphragm
US4295009A (en) * 1980-03-07 1981-10-13 Amp Incorporated Piezoelectric audio transducer mounting and electrical connector
DE3107293C2 (de) * 1981-02-26 1987-05-14 Siemens AG, 1000 Berlin und 8000 München Anordnung zur Frequenzgangverbesserung für elektroakustische Wandler
US4429247A (en) * 1982-01-28 1984-01-31 Amp Incorporated Piezoelectric transducer supporting and contacting means
DE3609461A1 (de) * 1986-03-20 1987-09-24 Siemens Ag Elektroakustischer wandler

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0483559A3 (en) * 1990-10-30 1993-04-14 Siemens Aktiengesellschaft Handset structure for telephone sets

Also Published As

Publication number Publication date
ATE104823T1 (de) 1994-05-15
JPH0281600A (ja) 1990-03-22
US5030872A (en) 1991-07-09
EP0354520B1 (fr) 1994-04-20
CN1015289B (zh) 1992-01-01
DE58907495D1 (de) 1994-05-26
CN1040297A (zh) 1990-03-07
EP0354520A3 (fr) 1991-04-03

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