EP0025955B1 - Transducteur piézoélectrique d'appel - Google Patents

Transducteur piézoélectrique d'appel Download PDF

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Publication number
EP0025955B1
EP0025955B1 EP80105477A EP80105477A EP0025955B1 EP 0025955 B1 EP0025955 B1 EP 0025955B1 EP 80105477 A EP80105477 A EP 80105477A EP 80105477 A EP80105477 A EP 80105477A EP 0025955 B1 EP0025955 B1 EP 0025955B1
Authority
EP
European Patent Office
Prior art keywords
transducer
plate
resonance
piezo
helmholtz resonator
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.)
Expired
Application number
EP80105477A
Other languages
German (de)
English (en)
Other versions
EP0025955A1 (fr
Inventor
Klaus Baier
Erwin 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 AT80105477T priority Critical patent/ATE11478T1/de
Publication of EP0025955A1 publication Critical patent/EP0025955A1/fr
Application granted granted Critical
Publication of EP0025955B1 publication Critical patent/EP0025955B1/fr
Expired legal-status Critical Current

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    • 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 
    • H04R1/225—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only  for telephonic receivers
    • 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
    • H04R17/10—Resonant transducers, i.e. adapted to produce maximum output at a predetermined frequency
    • 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 a piezoelectric ringing transducer for emitting a ringing tone with a transducer plate which is clamped between elastic bearing bodies in its edge region and is provided with a piezoelectric layer and is actuated by a ringing oscillator which supplies two alternating signals.
  • a piezoelectric transducer of the type specified above is known from German patent 1 961 217. This type of transducer can basically be used as a sound generator or sound receiver. If these transducers are used as sound generators, in particular as signal generators for telephone sets, it is necessary to take certain measures in order to achieve a high volume.
  • transducers are used as ringer transducers in telephone systems, there are no requirements for a uniform frequency response, but the resonance points can be used to increase the sound to be emitted.
  • the object is achieved according to the invention in that the frequencies of the Singale two resonant frequencies of the transducer are tuned, wherein the resonance frequency is determined by the by the Wandlerpla t te certain plate resonance of the fundamental frequency and the other resonant frequency by a Helmholtz resonator, the front of the sound-emitting side of the transducer plate is arranged.
  • the desired strength of the call can be achieved relatively easily.
  • DE-A 2 310 582 discloses a piezoelectric transducer for emitting a ringing tone, which has a transducer plate provided with a piezoelectric disk, the plate being able to vibrate with two different resonance frequencies.
  • a special resonance element is provided, on which copper disks are applied and which serves as a carrier plate for the converter element.
  • a transducer plate is provided in the invention, which is provided with a piezoelectric layer. This arrangement is mounted in its edge area and coupled to a Helmholtz resonator, which is arranged in front of the sound-radiating side of the transducer plate.
  • a transducer is also known in which a Helmholtz resonator is arranged in the rear space of the transducer plate.
  • the task is to design this Helmholtz resonator so that it flattens the resonance peaks caused by the plate resonance.
  • the plate has two resonance frequencies. One is given by the fundamental and is around 1600 Hz, the second by the harmonic at around 3500 Hz. Since the transducer is to be designed as a microphone, these resonances must be damped to a predetermined level so as not to interfere with the Frequency response of the converter. This is achieved in that the Helmholtz resonator located behind the transducer plate is matched to the basic resonances and dampens them.
  • the harmonic is damped in another way, e.g. B. by appropriate storage or rigidity of the transducer plate.
  • DE-A 2 738 773 also describes a transducer which has at least two resonance frequencies.
  • the transducer has two oscillating plates, the first oscillating plate being able to oscillate electromagnetically.
  • the object of this arrangement is to make the frequency band wider, so that a large number of tone colors can be produced with low power consumption.
  • the transducer according to the invention is a ringing transducer.
  • a Helmholtz resonator is arranged in front of the transducer plate, which does not dampen but rather amplify a plate resonance of the transducer plate determined by the fundamental vibration.
  • the second resonance determined by the harmonic of the transducer plate is not used, since this cannot be achieved by a Helmholtz resonator.
  • the resonance of the Helmholtz resonator and the resonance frequency of the fundamental oscillation are close to each other, but they are not the same. It is essential that these resonances according to the invention from the ringing oscillator given frequencies are matched.
  • both call signals are reproduced at approximately the same volume.
  • the resonance frequency of the Helmholtz resonator may be higher than the resonance frequency of the transducer plate.
  • the maximum possible volume of the signal generator is determined by the resonance frequency of the Helmholtz resonator. A slight scatter in the frequency and the sound level is advantageous.
  • the signal transmitter shown in FIG. 1 consists of a housing 1, in the interior of which a transducer plate 3 provided with a piezoelectric layer 2 is arranged between two elastic long bodies 4 and 5.
  • the converter plate By arranging the converter plate, the converter is divided into different volumes, namely into a rear space 6 with the volume V 3 and the suspension C 3 , and into an anteroom 7 with the volume V 2 and the suspension C 2 .
  • a cylindrical opening 8 is provided on the outside, which forms the Helmholtz resonator opening with its mass m 2 , its frictional resistance r 2 and the area A 2 .
  • the converter plate 3 has a mass m i , a suspension CI and a frictional resistance r.
  • the transducer On the outside, the transducer is terminated with the acoustic impedance Z ak .
  • FIG. 2 is divided into the following areas:

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Piezo-Electric Transducers For Audible Bands (AREA)
  • Apparatuses For Generation Of Mechanical Vibrations (AREA)

Claims (2)

1. Transducteur d'appel piézoélectrique servant à émettre un appel et comportant une plaque de transducteur (3), qui est munie d'une couche piézoélectrique (2), est serrée au niveau de son bord entre deux supports élastiques (4, 5) et est commandée par un oscillateur d'appel qui délivre deux signaux alternants, notamment pour des installations de téléphonie, caractérisé par le fait que les fréquences des signaux sont réglées sur deux fréquences de résonance du transducteur, une fréquence de résonance étant déterminée par le résonance, déterminée par la plaque (3), de l'oscillation de base et l'autre fréquence de résonance étant déterminée par le résonateur de Helmholtz (7 avec 8, C), qui est disposé en avant de la face de la plaque du transducteur, qui émet le son.
2. Transducteur piézoélectrique selon la revendication 1, caractérisé par le fait que la fréquence de résonance du résonateur de Helmholtz est supérieure à la fréquence de résonance de la plaque du transducteur.
EP80105477A 1979-09-19 1980-09-12 Transducteur piézoélectrique d'appel Expired EP0025955B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT80105477T ATE11478T1 (de) 1979-09-19 1980-09-12 Piezoelektrischer tonrufwandler.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2937922 1979-09-19
DE19792937922 DE2937922A1 (de) 1979-09-19 1979-09-19 Piezoelektrischer wandler

Publications (2)

Publication Number Publication Date
EP0025955A1 EP0025955A1 (fr) 1981-04-01
EP0025955B1 true EP0025955B1 (fr) 1985-01-23

Family

ID=6081296

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80105477A Expired EP0025955B1 (fr) 1979-09-19 1980-09-12 Transducteur piézoélectrique d'appel

Country Status (10)

Country Link
EP (1) EP0025955B1 (fr)
JP (1) JPS5651200A (fr)
AR (1) AR223549A1 (fr)
AT (1) ATE11478T1 (fr)
AU (1) AU538420B2 (fr)
BR (1) BR8005981A (fr)
DE (1) DE2937922A1 (fr)
FI (1) FI74183C (fr)
GR (1) GR70029B (fr)
ZA (1) ZA805775B (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3131349C2 (de) * 1981-08-07 1983-05-11 Rosenthal Technik Ag, 8672 Selb Piezoelektrischer Dreitongeber
US4413198A (en) * 1981-12-30 1983-11-01 Motorola, Inc. Piezoelectric transducer apparatus
DE3446183A1 (de) * 1984-12-18 1986-06-26 Siemens AG, 1000 Berlin und 8000 München Piezoelektrischer wandler
JPS6295399U (fr) * 1985-12-03 1987-06-18
AU588989B2 (en) * 1986-04-10 1989-09-28 Alcatel Australia Limited An improved transducer
DE4311701C2 (de) * 1993-04-08 1999-08-26 Siemens Ag Anordnung zur Erzeugung von akustischen Signalen, insbesondere Tonrufen in Telekommunikationsgeräten

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1961217C3 (de) * 1969-12-05 1978-08-24 Siemens Ag, 1000 Berlin Und 8000 Muenchen Elektroakustischer Wandler, insbesondere Mikrofon für Fernsprechanlagen

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB202938A (en) * 1922-02-06 1923-08-07 Signal Gmbh Improvements in acoustic apparatus
DE2119911B2 (de) * 1971-04-23 1973-11-15 Siemens Ag, 1000 Berlin U. 8000 Muenchen Elektroakustischer Wandler, insbe sondere Mikrofon fur Fernsprechanlagen
GB1370164A (en) * 1972-01-30 1974-10-16 Mullard Ltd Piezoelectric transducer
DE2223531B1 (de) * 1972-05-15 1973-11-08 Siemens Ag Elektroakustischer wandler
US4006371A (en) * 1973-03-19 1977-02-01 Whitewater Electronics, Inc. Electroacoustical transducer comprising piezoelectric element
US4056741A (en) * 1973-04-18 1977-11-01 Airco, Inc. Audible signal generating apparatus having selectively controlled audible output
US3922672A (en) * 1974-03-04 1975-11-25 Mallory & Co Inc P R Audible alarm device
JPS5330296A (en) * 1976-09-01 1978-03-22 Seiko Instr & Electronics Ltd Electro-acoustic transducer

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1961217C3 (de) * 1969-12-05 1978-08-24 Siemens Ag, 1000 Berlin Und 8000 Muenchen Elektroakustischer Wandler, insbesondere Mikrofon für Fernsprechanlagen

Also Published As

Publication number Publication date
GR70029B (fr) 1982-07-23
DE2937922A1 (de) 1981-04-09
BR8005981A (pt) 1981-03-31
ZA805775B (en) 1981-09-30
ATE11478T1 (de) 1985-02-15
AU538420B2 (en) 1984-08-16
DE2937922C2 (fr) 1988-11-24
FI802943A (fi) 1981-03-20
FI74183C (fi) 1987-12-10
AR223549A1 (es) 1981-08-31
JPS5651200A (en) 1981-05-08
FI74183B (fi) 1987-08-31
EP0025955A1 (fr) 1981-04-01
AU6250980A (en) 1981-04-09

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