EP0081780B1 - Electrodynamic transducer - Google Patents

Electrodynamic transducer Download PDF

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Publication number
EP0081780B1
EP0081780B1 EP19820111252 EP82111252A EP0081780B1 EP 0081780 B1 EP0081780 B1 EP 0081780B1 EP 19820111252 EP19820111252 EP 19820111252 EP 82111252 A EP82111252 A EP 82111252A EP 0081780 B1 EP0081780 B1 EP 0081780B1
Authority
EP
European Patent Office
Prior art keywords
pin
transducer
membrane
aperture
acoustic
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
EP19820111252
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German (de)
French (fr)
Other versions
EP0081780A1 (en
Inventor
Kai Borge Hansen
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.)
Pulse HVT ApS
Original Assignee
International Standard Electric 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 International Standard Electric Corp filed Critical International Standard Electric Corp
Publication of EP0081780A1 publication Critical patent/EP0081780A1/en
Application granted granted Critical
Publication of EP0081780B1 publication Critical patent/EP0081780B1/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
    • H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/10—Telephone receivers
    • 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 

Definitions

  • the invention relates to an electrodynamic transducer with a membrane voice coil arrangement held by a fastening ring and a permanent magnet system arranged in a housing, in which the membrane is provided with an opening for damping the low frequencies.
  • Such a converter is known (DE-B-1 230 858).
  • a tube is arranged in the free-swinging part of the membrane.
  • it is also difficult to dimension an acoustic filter designed in this way exactly.
  • a speaker i.e. H. a transducer known (FR-E-34 820), in which the membrane is mechanically guided in such a way that lateral deflection is avoided. This is done using a pin that protrudes into an opening in the center of the membrane. In this known loudspeaker, the opening surrounds the pin so tightly that both can just slide together. In the known loudspeaker, the technical problem and its solution are completely different from those of the application.
  • the object on which the invention is based is to create a transducer in which the undesired low frequencies are damped by simple design measures and the sensitivity of the transducer to these frequencies is thus reduced.
  • the frequency dependence of the acoustic resistance shifts towards higher frequencies.
  • the acoustic reactance is higher than the acoustic resistance, so that the impedance of the acoustic shunt is greater at those frequencies at which the acoustic resistance is frequency-dependent.
  • the distortions resulting from the sensitivity correcting shunt are reduced to a minimum.
  • FIG. 1 shows a known converter which is suitable for the configuration according to the invention.
  • This transducer consists of the membrane vibration coil arrangement 13, 15 arranged on the fastening ring 10 and the permanent magnet system 5, 4, 3, which is held together by the guide rod 2 forming part of the housing 1.
  • the voice coil 15 is arranged concentrically in the air gap 6 formed by the pole pieces 3 and 4.
  • the converter also has a retaining ring 20.
  • the acoustic shunt consists of an elongated circular opening 26 which arises between the outer surfaces of a pin 27, 28 and the inner surface of a hole 29 into which the pin projects.
  • the ring width A (Fig. 4), which limits the path of the air flow through the membrane, is smaller than the diameter of a hole which would be necessary to achieve the same acoustic resistance. As a result, the frequency at which the acoustic resistance becomes frequency-dependent is shifted towards higher frequencies.
  • the fixed pins 27, 28 projecting into the hole 29 ensure that one of the edges delimiting the air flow has a large surface area towards the air flow. The result of this is that the acoustic reactance is large compared to the acoustic resistance at those frequencies at which the resistance is frequency dependent.
  • the annular opening 26 should preferably be arranged concentrically in the membrane.
  • the construction of the transducer, as illustrated in FIG. 1, facilitates the implementation of the pin-hole arrangement, as shown in FIGS. 2 and 3.
  • the pin 27 is a component of the guide rod 2.
  • the hole 29 in the membrane 13 can be punched after the membrane has been fastened to the support ring 10 and with the aid of the same reference surfaces which are used for the adjustment the voice coil can be used, adjusted. Further details related to the manufacture and assembly of the swingarm coils are described in European patent application 0040948.
  • FIG. 3 Another embodiment of the pin-hole arrangement is illustrated in FIG. Instead of connecting the pin to the concentrically arranged guide rod 2, the same effect can be achieved if the pin 28 (FIG. 3) is attached to the retaining ring 20. However, it could prove more difficult to adjust such a pin 28.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)

Description

Die Erfindung betrifft einen elektrodynamischen Wandler mit einer von einem Befestigungsring gehaltenen Membran-Schwingspulenanordnung und einem in einem Gehäuse angeordneten Dauermagnetsystem bei dem die Membran mit einer Öffnung zur Bedämpfung der tiefen Frequenzen versehen ist.The invention relates to an electrodynamic transducer with a membrane voice coil arrangement held by a fastening ring and a permanent magnet system arranged in a housing, in which the membrane is provided with an opening for damping the low frequencies.

Ein solcher Wandler ist bekannt (DE-B-1 230 858). Bei diesem bekannten Wandler ist im freischwingenden Teil der Membran ein Rohr angeordnet. Abgesehen davon, daß die Herstellung der Membran beim bekannten Wandler schwierig und daher kostenungünstig ist, ist es auch schwierig, ein in dieser Weise gestaltetes akustisches Filter exakt zu dimensionieren.Such a converter is known (DE-B-1 230 858). In this known transducer, a tube is arranged in the free-swinging part of the membrane. Apart from the fact that the manufacture of the membrane in the known transducer is difficult and therefore inexpensive, it is also difficult to dimension an acoustic filter designed in this way exactly.

Es ist auch ein Lautsprecher, d. h. ein Wandler bekannt (FR-E-34 820), bei dem die Membran in der Weise mechanisch geführt ist, daß eine seitliche Auslenkung vermieden ist. Dazu dient ein Stift, der in eine Öffnung im Zentrum der Membran hineinragt. Bei diesem bekannten Lautsprecher umschließt die Öffnung den Stift so eng, daß beide gerade aneinandergleiten können. Beim bekannten Lautsprecher sind das technische Problem und dessen Lösung von denjenigen der Anmeldung völlig verschieden.It is also a speaker, i.e. H. a transducer known (FR-E-34 820), in which the membrane is mechanically guided in such a way that lateral deflection is avoided. This is done using a pin that protrudes into an opening in the center of the membrane. In this known loudspeaker, the opening surrounds the pin so tightly that both can just slide together. In the known loudspeaker, the technical problem and its solution are completely different from those of the application.

Bei in Telefonapparaten verwendeten elektroakustischen Wandlern ist es notwendig, daß sie geringe Verzerrungen erzeugen, eine flache Frequenzcharakteristik aufweisen und nur für den üblicherweise übertragenen Frequenzbereich (300 Hz-4 kHz) empfindlich sind. Die Begrenzung der Ansprechempfindlichkeit außerhalb des Übertragungsbereiches sollte durch akustische Filter bewirkt werden, so daß das elektrische Filtern dieser Signale vermieden wird, welche als unerwünschtes elektrisches Rauschen auftreten.In the case of electroacoustic transducers used in telephone apparatuses, it is necessary that they produce low distortion, have a flat frequency characteristic and are only sensitive to the frequency range which is usually transmitted (300 Hz-4 kHz). The response sensitivity outside the transmission range should be limited by acoustic filters, so that the electrical filtering of these signals, which occur as unwanted electrical noise, is avoided.

Die der Erfindung zugrundeliegende Aufgabe besteht darin, einen Wandler zu schaffen, bei dem durch einfache konstruktive Maßnahmen die unerwünschten tiefen Frequenzen bedämpft werden und somit die Empfindlichkeit des Wandlers für diese Frequenzen verringert wird.The object on which the invention is based is to create a transducer in which the undesired low frequencies are damped by simple design measures and the sensitivity of the transducer to these frequencies is thus reduced.

Diese Aufgabe ist erfindungsgemäß dadurch gelöst, daß in die Öffnung ein feststehend angeordneter Stift hineinragt,_daß der Stift einen kreisförmigen Querschnitt besitzt und sein Durchmesser geringfügig kleiner als der Durchmesser der Öffnung istThis object is achieved in that a fixed pin protrudes into the opening, that the pin has a circular cross section and its diameter is slightly smaller than the diameter of the opening

Vorteilhafte Ausgestaltungen der Erfindung sind in den Ansprüchen 2 und 3 enthalten.Advantageous embodiments of the invention are contained in claims 2 and 3.

Bei der erfindungsgemäßen Lösung verschiebt sich die Frequenzabhängigkeit des akustischen Widerstands nach höheren Frequenzen hin. Bei diesen höheren Frequenzen ist der akustische Blindwiderstand höher als der akustische Wirkwiderstand, so daß der Scheinwiderstand des akustischen Nebenschlusses bei solchen Frequenzen größer ist, bei denen der akustische Wirkwiderstand frequenzabhängig ist. Als Folge davon sind die von dem die Empfindlichkeit korrigierenden Nebenschluß herrührenden Verzerrungen auf ein Minimum reduziert.In the solution according to the invention, the frequency dependence of the acoustic resistance shifts towards higher frequencies. At these higher frequencies, the acoustic reactance is higher than the acoustic resistance, so that the impedance of the acoustic shunt is greater at those frequencies at which the acoustic resistance is frequency-dependent. As a result, the distortions resulting from the sensitivity correcting shunt are reduced to a minimum.

Die Erfindung ist nachstehend anhand mehrerer in den Figuren 1 bis 4 gezeigter Ausführungsbeispiele verdeutlicht. Es zeigen :

  • Figur 1 den Schnitt durch einen bekannten Wandler,
  • Figur 2 und
  • Figur 3 Ausführungsformen der Öffnung in der Membran und
  • Figur 4 die kreisförmige Öffnung in der Membran gemäß Fig. 2 und 3.
The invention is illustrated below with reference to several exemplary embodiments shown in FIGS. 1 to 4. Show it :
  • FIG. 1 shows the section through a known converter,
  • Figure 2 and
  • Figure 3 embodiments of the opening in the membrane and
  • 4 shows the circular opening in the membrane according to FIGS. 2 and 3.

Figur 1 zeigt einen bekannten Wandler, welcher zur Ausgestaltung gemäß der Erfindung geeignet ist. Dieser Wandler besteht aus der auf dem Befestigungsring 10 angeordneten Membran-Schwingungspulenanordnung 13, 15 und dem Dauermagnetsystem 5, 4, 3, welches von dem ein Bestandteil des Gehäuses 1 bildenden Führungsstab 2 zusammengehalten ist. Die Schwingspule 15 ist konzentrisch in dem von den Polschuhen 3 und 4 gebildeten Luftspalt 6 angeordnet. Der Wandler besitzt außerdem einen Haltering 20.FIG. 1 shows a known converter which is suitable for the configuration according to the invention. This transducer consists of the membrane vibration coil arrangement 13, 15 arranged on the fastening ring 10 and the permanent magnet system 5, 4, 3, which is held together by the guide rod 2 forming part of the housing 1. The voice coil 15 is arranged concentrically in the air gap 6 formed by the pole pieces 3 and 4. The converter also has a retaining ring 20.

Aus den Figuren 2 und 3 ist ersichtlich, daß bei den dort dargestellten Ausführungsbeispielen der akustischen Nebenschluß aus einer langgestreckten kreisförmigen Öffnung 26 besteht, welche zwischen den Außenflächen eines Stiftes 27, 28 und der Innenfläche eines Loches 29, in das der Stift hineinragt, entsteht.It can be seen from FIGS. 2 and 3 that in the exemplary embodiments shown there the acoustic shunt consists of an elongated circular opening 26 which arises between the outer surfaces of a pin 27, 28 and the inner surface of a hole 29 into which the pin projects.

Die Ringbreite A (Fig. 4), welche den Weg des Luftstromes durch die Membran begrenzt, ist geringer als der Durchmesser eine Loches, welcher zur Verwirklichung des gleichen akustischen Widerstandes notwendig wäre. Dadurch wird diejenige Frequenz, bei welcher der akustische Widerstand frequenzabhängig wird, nach höheren Frequenzen hin verschoben.The ring width A (Fig. 4), which limits the path of the air flow through the membrane, is smaller than the diameter of a hole which would be necessary to achieve the same acoustic resistance. As a result, the frequency at which the acoustic resistance becomes frequency-dependent is shifted towards higher frequencies.

Die feststehenden, in das Loch 29 hineinragenden Stifte 27, 28 stellen sicher, daß eine der den Luftstrom begrenzenden Kanten eine große Oberfläche zum Luftstrom hin besitzt. Die Folge davon ist, daß der akustische Blindwiderstand im Vergleich zum akustischen Widerstand bei solchen Frequenzen groß ist, bei denen der Widerstand frequenzabhängig ist.The fixed pins 27, 28 projecting into the hole 29 ensure that one of the edges delimiting the air flow has a large surface area towards the air flow. The result of this is that the acoustic reactance is large compared to the acoustic resistance at those frequencies at which the resistance is frequency dependent.

Die kreisringförmige Öffnung 26 sollte vorzugsweise konzentrisch in der Membran angeordnet sein. Der Aufbau des Wandlers, wie er in Fig. 1 verdeutlicht ist, erleichtert die Verwirklichung der Stift-Loch-Anordnung, wie sie in den Figuren 2 und 3 dargestellt ist.The annular opening 26 should preferably be arranged concentrically in the membrane. The construction of the transducer, as illustrated in FIG. 1, facilitates the implementation of the pin-hole arrangement, as shown in FIGS. 2 and 3.

Bei der aus Figur 2 ersichtlichen Ausführungsform ist der Stift 27 ein Bestandteil des Führungsstabes 2. Das Loch 29 in der Membran 13 kann gestanzt werden, nachdem die Membran auf dem Tragring 10 befestigt worden ist, und mit Hilfe der gleichen Referenzflächen, welche für die Justage der Schwingspule verwendet werden, justiert werden. Weitere Einzelheiten im Zusammenhang mit der Herstellung und Montage der Schwingspule sind in der europäischen Patentanmeldung 0040948 beschrieben.In the embodiment shown in FIG. 2, the pin 27 is a component of the guide rod 2. The hole 29 in the membrane 13 can be punched after the membrane has been fastened to the support ring 10 and with the aid of the same reference surfaces which are used for the adjustment the voice coil can be used, adjusted. Further details related to the manufacture and assembly of the swingarm coils are described in European patent application 0040948.

Auf diese Weise wird die größte Sicherheit für eine konzentrische Anordnung des Stiftes 27 in dem Loch 29 erzielt, wodurch die Verwirklichung einer sehr schmalen Ringbreite A zwischen den Luftstromgrenzen möglich ist.In this way, the greatest security for a concentric arrangement of the pin 27 in the hole 29 is achieved, whereby the realization of a very narrow ring width A between the air flow limits is possible.

In Figur 3 ist eine andere Ausführungsform der Stift-Loch-Anordnung verdeutlicht. Anstatt den Stift mit dem konzentrisch angeordneten Führungsstab 2 zu verbinden, kann die gleiche Wirkung dadurch erzielt werden, wenn der Stift 28 (Fig. 3) an dem Haltring 20 befestigt ist. Es könnte sich jedoch als schwieriger erweisen, einen solchen Stift 28 zu justieren.Another embodiment of the pin-hole arrangement is illustrated in FIG. Instead of connecting the pin to the concentrically arranged guide rod 2, the same effect can be achieved if the pin 28 (FIG. 3) is attached to the retaining ring 20. However, it could prove more difficult to adjust such a pin 28.

Claims (3)

1. Electrodynamic transducer comprising a diaphragm/moving-coil assembly (13, 15) which is held by a retaining ring (10) and a permanent- magnet assembly (5, 4, 3) fitted in a housing, in which the diaphragm (13) is provided with an aperture (29) for attenuating low frequencies, characterized in that a fixed pin (27, 28) projects into the aperture (29), that the pin (27, 28) has a circular cross section and that its diameter is slightly smaller than the diameter of the aperture (29).
2. Transducer as claimed in Claim 1, characterized in that the pin (27) is attached or integrally connected to the guide rod (2).
3. Transducer as claimed in Claim 1, characterized in that the pin (28) is attached or integrally connected to the retaining ring (20).
EP19820111252 1981-12-10 1982-12-04 Electrodynamic transducer Expired EP0081780B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DK5473/81 1981-12-10
DK547381A DK148550C (en) 1981-12-10 1981-12-10 ELECTRODYNAMIC TRANSDUCER WITH MOBILE COIL

Publications (2)

Publication Number Publication Date
EP0081780A1 EP0081780A1 (en) 1983-06-22
EP0081780B1 true EP0081780B1 (en) 1986-10-01

Family

ID=8142738

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19820111252 Expired EP0081780B1 (en) 1981-12-10 1982-12-04 Electrodynamic transducer

Country Status (5)

Country Link
EP (1) EP0081780B1 (en)
AU (1) AU556443B2 (en)
DE (1) DE3273600D1 (en)
DK (1) DK148550C (en)
NZ (1) NZ202625A (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3530869A1 (en) * 1985-08-29 1987-03-12 Sennheiser Electronic Diaphragm for an electro-acoustic reproduction transducer
DK164621C (en) * 1989-10-09 1992-12-07 Kirk Acoustics As ELECTRODYNAMIC TRANSDUCER
WO2012114159A1 (en) * 2011-02-25 2012-08-30 Nokia Corporation A transducer apparatus

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR34820E (en) * 1925-01-09 1927-10-21
DE864269C (en) * 1948-10-31 1953-01-22 Charlotte Thomson Electrodynamic voice coil with self-cooling
NL111663C (en) * 1956-10-11
BE562680A (en) * 1956-11-26
DE1230858B (en) * 1960-06-22 1966-12-22 Siemens Ag Diaphragm for an electroacoustic transducer
DE1762676A1 (en) * 1968-08-02 1970-07-02 Peerles Mb Gmbh Feinmechanik U Membrane for microphone system with omnidirectional characteristics or loudspeaker system
DE2322475C2 (en) * 1972-02-09 1981-10-08 Fernsprech- Und Signalbau Lehner & Co Kg, 4300 Essen Electroacoustic transducer, in particular for speech and earphone capsules for telephone sets

Also Published As

Publication number Publication date
NZ202625A (en) 1985-08-16
EP0081780A1 (en) 1983-06-22
AU556443B2 (en) 1986-11-06
DE3273600D1 (en) 1986-11-06
DK148550C (en) 1986-04-21
DK547381A (en) 1983-06-11
DK148550B (en) 1985-07-29
AU9113282A (en) 1983-06-16

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