EP0025955A1 - Piezo-electric ringing transducer - Google Patents

Piezo-electric ringing transducer Download PDF

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Publication number
EP0025955A1
EP0025955A1 EP80105477A EP80105477A EP0025955A1 EP 0025955 A1 EP0025955 A1 EP 0025955A1 EP 80105477 A EP80105477 A EP 80105477A EP 80105477 A EP80105477 A EP 80105477A EP 0025955 A1 EP0025955 A1 EP 0025955A1
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EP
European Patent Office
Prior art keywords
transducer
plate
resonance
resonance frequency
piezoelectric
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
EP80105477A
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German (de)
French (fr)
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EP0025955B1 (en
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
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Siemens AG
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Filing date
Publication date
Application filed by Siemens AG filed Critical Siemens AG
Priority to AT80105477T priority Critical patent/ATE11478T1/en
Publication of EP0025955A1 publication Critical patent/EP0025955A1/en
Application granted granted Critical
Publication of EP0025955B1 publication Critical patent/EP0025955B1/en
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 transducer for emitting a ringing tone with a transducer plate clamped between bearing bodies and provided with a piezoelectric layer, in particular for signal generators of telephone systems.
  • a piezoelectric transducer of the type specified above is known from DE-PS 19 61 217.
  • Transducers of this type can basically be used as sound generators or sound receivers. 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.
  • the transducer is controlled by a ringing oscillator which supplies two alternating signals, the frequencies of which are tuned to two resonant frequencies of the transducer.
  • the desired strength of the call can be achieved relatively easily.
  • the one resonance frequency is formed by the plate resonance determined by the transducer plate.
  • the resonance of the transducer plate in addition to the strength and size of W a ndlerplatte itself determined by their clamping to a decisive extent.
  • the resonance can develop to a maximum when the transducer plate is clamped in its edge region as undamped as possible, as can advantageously be achieved by clamping the transducer plate in two elastic bearing bodies.
  • the other resonance frequency can advantageously be determined by a Helmholtz resonator, which is arranged in front of the sound-emitting side of the transducer plate.
  • 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 this resonance frequency. A small spread of the frequency and the sound level is advantageous.
  • the signal generator shown in Fig. 1 consists of a Ge housing 1, in the interior of which is provided with a piezoelectric layer 2 transducer plate 3 between two elastic bearing 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 21, its frictional resistance r 2 and the area A 2 .
  • the converter plate 3 has a mass m 1 , a suspension c 1 and a frictional resistance r 1 .
  • the converter On the outside, the converter is terminated with the acoustic impedance Z ak .

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)

Abstract

1. A piezo-electric transducer for radiating a ringing tone, having a transducer plate (3) clamped between two elastic support bodies (4, 5) at the edge thereof and provided with a piezo-electric layer (2) controlled by a ringing tone oscillator, which supplies two a.c. signals, in particular for telephone installations, characterised in that the frequencies of the signals are tuned to two resonance frequencies of the transducer, the one resonance frequency being determined by the fundamental oscillatory resonance of the transducer plate (3), and the other resonance frequency being determined by a Helmholtz resonator (7 and 8, C) arranged on the sound-radiating side of the transducer plate.

Description

Die Erfindung betrifft einen piezoelektrischen Wandler zur Abstrahlung eines Tonrufes mit einer zwischen Lagerkörpern eingespannten mit einer piezoelektrischen Schicht versehenen Wandlerplatte, insbesondere für Signalgeber von Fernsprechanlagen.The invention relates to a piezoelectric transducer for emitting a ringing tone with a transducer plate clamped between bearing bodies and provided with a piezoelectric layer, in particular for signal generators of telephone systems.

Ein piezoelektrischer Wandler der oben angegebenen Bauart ist durch die DE-PS 19 61 217 bekannt. Wandler dieser Art sind'grundsätzlich als Schallgeber oder Schallempfänger verwendbar. Verwendet man diese Wandler als Schallgeber, insbesondere als Signalgeber für Fernsprechgeräte, so ist es erforderlich, bestimmte Maßnahmen zu treffen, um eine hohe Lautstärke zu erzielen.A piezoelectric transducer of the type specified above is known from DE-PS 19 61 217. Transducers of this type can basically be used as sound generators or sound receivers. 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.

Bei hochwertigen Wandlern werden Vorkehrungen getroffen, die Resonanzfrequenzen weit außerhalb des für den Fernsprechverkehr interessierenden Frequenzbereiches zu legen, so daß die Bestimmungsgrößen des Schallfeldes und der mechanischen Auslenkung der Wandlerplatte innerhalb des interessierenden Frequenzbereiches weitgehend frequenzunabhängig sind. Im Interesse eines möglichst großen Wirkungsgrades kann man bei elektroakustischen Wandlern für Fernsprechzwecke im allgemeinen nicht darauf verzichten, die Einspannung der Wandlerplatte so zu wählen, daß eine oder mehrere Resonanzfrequenzen innerhalb oder in der Nähe des interessierenden Frequenzbereiches liegen. Um dennoch die Frequenzabhängigkeit des elektroakustischen Übertragungsfaktors innerhalb eines vorgegebenen Toleranzschemas zu halten, werden derartige Wandler mit entsprechend abgestimmten Resonatoren gekoppelt, mit deren Hilfe Resonanzspitzen kompensiert werden können.With high-quality transducers, precautions are taken to place the resonance frequencies far outside the frequency range of interest for telephone traffic, so that the parameters of the sound field and the mechanical deflection of the transducer plate are largely independent of frequency within the frequency range of interest. In the interest of the greatest possible efficiency, electroacoustic transducers for telephone purposes generally cannot do without selecting the clamping of the transducer plate in such a way that one or more resonance frequencies lie within or in the vicinity of the frequency range of interest. In order nevertheless to keep the frequency dependence of the electroacoustic transmission factor within a predetermined tolerance scheme, such transducers are coupled with appropriately tuned resonators, with the aid of which resonance peaks can be compensated for.

Werden derartige Wandler als Signalgeber in Fernsprechanlagen eingesetzt, so werden keine Anforderungen an einen gleichmäßigen Frequenzgang gestellt, sondern es können die Resonanzstellen zur Erhöhung des abzustrahlenden Schalles ausgenutzt werden.If such converters are used as signal transmitters 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.

Es ist Aufgabe der vorliegenden Erfindung, Wandler und Tonrufoszillator als Ansteuerteil so aufeinander abzustimmen, daß ein durchdringender, lauter Ruf des Signalgebers erzielbar ist.It is an object of the present invention to match the transducer and ringing oscillator as a control part so that a penetrating, loud call from the signal generator can be achieved.

Die Aufgabe wird gemäß der Erfindung dadurch gelöst, daß der Wandler von einem Tonrufoszillator angesteuert wird, der zwei alternierende Signale liefert, deren Frequenzen auf zwei Resonanzfrequenzen des Wandlers abgestimmt sind.The object is achieved according to the invention in that the transducer is controlled by a ringing oscillator which supplies two alternating signals, the frequencies of which are tuned to two resonant frequencies of the transducer.

Durch die zwei alternierenden, auf die Resonanzfrequenzen des Wandlers abgestimmten Signale des Tonrufoszillators ist die gewünschte Stärke des Rufes relativ unproblematisch erzielbar.Due to the two alternating signals of the ringing oscillator, which are matched to the resonance frequencies of the transducer, the desired strength of the call can be achieved relatively easily.

Es ist zweckmäßig, wenn die eine Resonanzfrequenz durch die von der Wandlerplatte bestimmten Plattenresonanz gebildet ist.It is expedient if the one resonance frequency is formed by the plate resonance determined by the transducer plate.

Die Resonanz der Wandlerplatte wird neben der Stärke und Größe der Wandlerplatte selbst in entscheidendem Maß durch deren Einspannung bestimmt. Die Resonanz kann sich dann maximal ausbilden, wenn die Wandlerplatte in ihrem Randbereich möglichst ungedämpft eingespannt ist, wie dies in vorteilhafter Weise durch die Einspannung der Wandlerplatte in zwei elastischen Lagerkörpern erzielt werden kann.The resonance of the transducer plate, in addition to the strength and size of W a ndlerplatte itself determined by their clamping to a decisive extent. The resonance can develop to a maximum when the transducer plate is clamped in its edge region as undamped as possible, as can advantageously be achieved by clamping the transducer plate in two elastic bearing bodies.

Die andere Resonanzfrequenz kann in vorteilhafter Weise durch einen Helmholtzresonator bestimmt sein, der vor der .schallabstrahlenden Seite der Wandlerplatte angeordnet ist.The other resonance frequency can advantageously be determined by a Helmholtz resonator, which is arranged in front of the sound-emitting side of the transducer plate.

Weiterhin kann es zweckmäßig sein, daß die Resonanzfrequenz des Helmholtzresonators höher ist als die Resonanzfrequenz der Wandlerplatte. Durch diese Resonanzfrequenz ist die maximal mögliche Lautstärke des Signalgebers bestimmt. Vorteilhaft ist dabei eine geringe Streuung der Frequenz und des Schallpegels.Furthermore, it may be appropriate for the resonance frequency of the Helmholtz resonator to be higher than the resonance frequency of the transducer plate. The maximum possible volume of the signal generator is determined by this resonance frequency. A small spread of the frequency and the sound level is advantageous.

Im folgenden sei die Erfindung anhand von zwei Figuren näher erläutert.The invention is explained in more detail below with reference to two figures.

Es zeigen

  • Fig. 1 den prinzipiellen Aufbau eines piezoelektrischen Signalgebers im Schnitt und
  • Fig. 2 eine Ersatzschaltung zu der Anordnung nach Fig. 1.
Show it
  • Fig. 1 shows the basic structure of a piezoelectric signal generator in section and
  • 2 shows an equivalent circuit to the arrangement according to FIG. 1.

Der in Fig. 1 gezeigte Signalgeber besteht aus einem Gehäuse 1, in dessen Inneren eine mit einer piezoelektrischen Schicht 2 versehene Wandlerplatte 3 zwischen zwei elastischen Lagerkörpern 4 und 5 angeordnet ist. Durch die Anordnung der Wandlerplatte wird der Wandler in verschiedene Volumina aufgeteilt und zwar in einen Rückraum 6 mit dem Volumen V3 und der Federung C3, und in einen Vorraum 7 mit dem Volumen V2 und der Federung C2. Nach außen ist eine zylinderförmige Öffnung 8 vorgesehen, die die Helmholtzresonatoröffnung mit ihrer Masse m21 ihren Reibungswiderstand r2 und der Fläche A2 bildet. Die Wandlerplatte 3 weist eine Masse m1, eine Federung c1 und einen Reibungswiderstand r1 auf. Nach außen hin ist der Wandler mit der akustischen Impedanz Zak abgeschlossen.The signal generator shown in Fig. 1 consists of a Ge housing 1, in the interior of which is provided with a piezoelectric layer 2 transducer plate 3 between two elastic bearing bodies 4 and 5. 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 21, its frictional resistance r 2 and the area A 2 . The converter plate 3 has a mass m 1 , a suspension c 1 and a frictional resistance r 1 . On the outside, the converter is terminated with the acoustic impedance Z ak .

Unter- Verwendung der angegebenen Bezeichnungen ist nun in Fig. 2 ein Ersatzschaltbild dargestellt, das sich in folgende Bereiche aufgliedert:

  • A für den Generator
  • B für den Wandler
  • C für den Helmholtzresonator und
  • D für den akustischen Abschluß Zak.
Using the specified designations, an equivalent circuit diagram is now shown in FIG. 2, which is divided into the following areas:
  • A for the generator
  • B for the converter
  • C for the Helmholtz resonator and
  • D for the acoustic termination Z ak .

Claims (5)

1. Piezoelektrischer Wandler zur Abstrahlung eines Tonrufes mit einer zwischen Lagerkörpern eingespannten mit einer piezoelektrischen Schicht versehenen Wandlerplatte, insbesondere für Signalgeber von Fernsprechanlagen, dadurch gekennzeichnet , daß der Wandler von einem Tonrufoszillator angesteuert wird, der zwei alternierende Signale liefert, deren Frequenzen auf zwei Resonanzfrequenzen des Wandlers abgestimmt sind.1. Piezoelectric transducer for emitting a ringing tone with a transducer plate clamped between bearing bodies and provided with a piezoelectric layer, in particular for signal generators of telephone systems, characterized in that the transducer is driven by a ringing tone oscillator which supplies two alternating signals, the frequencies of which are at two resonance frequencies Converter are matched. 2. Piezoelektrischer Wandler nach Anspruch 1, dadurch gekennzeichnet , daß. die eine Resonanzfrequenz durch die von der Wandlerplatte (3) bestimmten Plattenresonanz gebildet ist.2. Piezoelectric converter according to claim 1, characterized in that. which a resonance frequency is formed by the plate resonance determined by the transducer plate (3). 3. Piezoelektrischer Wandler nach Anspruch 2, d a - durch gekennzeichnet, daß die Wandlerplatte von zwei elastischen Lagerkörpern (4, 5) in ihrem Randbereich gehalten ist.3. Piezoelectric transducer according to claim 2, d a - characterized in that the transducer plate is held by two elastic bearing bodies (4, 5) in its edge region. 4. Piezoelektrischer Wandler nach Anspruch 1, dadurch gekennzeichnet , daß die andere Resonanzfrequenz durch einen Helmholtzresonator bestimmt ist, der vor der schallabstrahlenden Seite der Wandlerplatte angeordnet ist.4. Piezoelectric transducer according to claim 1, characterized in that the other resonance frequency is determined by a Helmholtz resonator which is arranged in front of the sound-emitting side of the transducer plate. 5. Piezoelektrischer Wandler nach einem oder mehreren der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Resonanzfrequenz des Helmholtzresonators höher ist als die Resonanzfrequenz der Wandlerplatte.5. Piezoelectric transducer according to one or more of the preceding claims, characterized in that the resonance frequency of the Helmholtz resonator is higher than the resonance frequency of the transducer plate.
EP80105477A 1979-09-19 1980-09-12 Piezo-electric ringing transducer Expired EP0025955B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT80105477T ATE11478T1 (en) 1979-09-19 1980-09-12 PIEZOELECTRICAL TONE TRANSDUCER.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19792937922 DE2937922A1 (en) 1979-09-19 1979-09-19 PIEZOELECTRIC CONVERTER
DE2937922 1979-09-19

Publications (2)

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

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ID=6081296

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80105477A Expired EP0025955B1 (en) 1979-09-19 1980-09-12 Piezo-electric ringing transducer

Country Status (10)

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

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1983002364A1 (en) * 1981-12-30 1983-07-07 Motorola Inc Piezoelectric loudspeaker coupled with resonant structures
DE3446183A1 (en) * 1984-12-18 1986-06-26 Siemens AG, 1000 Berlin und 8000 München Piezo-electric transducer

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3131349C2 (en) * 1981-08-07 1983-05-11 Rosenthal Technik Ag, 8672 Selb Piezoelectric three-tone generator
JPS6295399U (en) * 1985-12-03 1987-06-18
AU588989B2 (en) * 1986-04-10 1989-09-28 Alcatel Australia Limited An improved transducer
DE4311701C2 (en) * 1993-04-08 1999-08-26 Siemens Ag Arrangement for generating acoustic signals, in particular tone calls in telecommunication devices

Citations (7)

* 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
DE2119911A1 (en) * 1971-04-23 1972-11-02 Siemens AG, 1000 Berlin u. 8000 München Electroacoustic transducers, in particular microphones for telephone systems
DE2310582A1 (en) * 1972-01-30 1973-09-13 Philips Nv PIEZOELECTRIC CONVERTER
DE2223531A1 (en) * 1972-05-15 1973-11-08
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
DE2738773A1 (en) * 1976-09-01 1978-03-09 Seiko Instr & Electronics ELECTROACOUSTIC CONVERTER

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE759888A (en) * 1969-12-05 1971-06-04 Siemens Ag ELECTRO-ACOUSTIC TRANSDUCER, ESPECIALLY MICROPHONE FOR TELEPHONE SYSTEMS
US3922672A (en) * 1974-03-04 1975-11-25 Mallory & Co Inc P R Audible alarm device

Patent Citations (10)

* 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
DE2119911A1 (en) * 1971-04-23 1972-11-02 Siemens AG, 1000 Berlin u. 8000 München Electroacoustic transducers, in particular microphones for telephone systems
US3798392A (en) * 1971-04-23 1974-03-19 Siemens Ag Electroacoustic transducer
DE2310582A1 (en) * 1972-01-30 1973-09-13 Philips Nv PIEZOELECTRIC CONVERTER
GB1370164A (en) * 1972-01-30 1974-10-16 Mullard Ltd Piezoelectric transducer
DE2223531A1 (en) * 1972-05-15 1973-11-08
US4027115A (en) * 1972-05-15 1977-05-31 Siemens Aktiengesellschaft Electroacoustic sound generator
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
DE2738773A1 (en) * 1976-09-01 1978-03-09 Seiko Instr & Electronics ELECTROACOUSTIC CONVERTER

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
JAPAN ELECTRONIC ENGINEERING, Band 16, Heft 155, November 1979, Tokyo, JP, J. KUWABARA et al.: "Piezoelectric buzzer applications expand", Seiten 50-54 * Das ganze Dokument * *
JAPAN ELECTRONIS ENGINEERING, Band 17, Heft 157, Januar 1980, Tokyo, JP, KENROKU TANI: "Piezoelectric ceramic buzzers achieve high sound levels", Seiten 71-74 * Das ganze Dokument * *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1983002364A1 (en) * 1981-12-30 1983-07-07 Motorola Inc Piezoelectric loudspeaker coupled with resonant structures
US4413198A (en) * 1981-12-30 1983-11-01 Motorola, Inc. Piezoelectric transducer apparatus
DE3446183A1 (en) * 1984-12-18 1986-06-26 Siemens AG, 1000 Berlin und 8000 München Piezo-electric transducer

Also Published As

Publication number Publication date
ZA805775B (en) 1981-09-30
FI802943A (en) 1981-03-20
ATE11478T1 (en) 1985-02-15
JPS5651200A (en) 1981-05-08
AR223549A1 (en) 1981-08-31
AU538420B2 (en) 1984-08-16
EP0025955B1 (en) 1985-01-23
DE2937922A1 (en) 1981-04-09
AU6250980A (en) 1981-04-09
DE2937922C2 (en) 1988-11-24
FI74183B (en) 1987-08-31
BR8005981A (en) 1981-03-31
GR70029B (en) 1982-07-23
FI74183C (en) 1987-12-10

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