EP0081780A1 - Electrodynamic transducer - Google Patents

Electrodynamic transducer Download PDF

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Publication number
EP0081780A1
EP0081780A1 EP82111252A EP82111252A EP0081780A1 EP 0081780 A1 EP0081780 A1 EP 0081780A1 EP 82111252 A EP82111252 A EP 82111252A EP 82111252 A EP82111252 A EP 82111252A EP 0081780 A1 EP0081780 A1 EP 0081780A1
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EP
European Patent Office
Prior art keywords
opening
membrane
pin
transducer according
converter
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Granted
Application number
EP82111252A
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German (de)
French (fr)
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EP0081780B1 (en
Inventor
Kai Borge Hansen
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Pulse HVT ApS
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International Standard Electric Corp
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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 converter with a membrane voice coil arrangement held by a fastening ring and a permanent magnet system arranged in a housing.
  • a transducer is described in European Patent Application No. 81 302 213.4 (Publication No. 0 040 948).
  • the object underlying the invention is to provide a transducer in which the undesirable low frequencies are damped by design measures and thus the sensitivity of the transducer to these frequencies is reduced.
  • the frequency dependence of the acoustic resistance shifts towards higher frequencies, while the acoustic reactive resistance is increased, as a result of which the total impedance of the acoustic shunt by the voice coil 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.
  • This transducer consists of the membrane voice 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 shoes 3 and 4.
  • the converter also has a retaining ring 20.
  • FIGS. 28 and 2C show schematically and greatly enlarged an exemplary embodiment for the elongated opening 21, which is arranged concentrically in the membrane 13.
  • several elongated openings 22, 23 are provided. It has been found that these embodiments represent a far better problem solution for an acoustic shunt than a simple cylindrical hole. However, such elongated openings are not so easy to manufacture.
  • FIG. 3 also greatly enlarged, another embodiment of an acoustic shunt is shown, in which the opening 24 be a piece of pipe 25 be stands, which is fixed in a hole in the membrane.
  • the pipe section 25 should fit well into the hole and there through a glue or dgL. be attached.
  • the advantage of this embodiment is that the air flow through this opening is influenced not only by the diameter of the pipe section 25, but also by the inner surface of the pipe section, which dampens the air flow and thus increases the acoustic reactive resistance causes. The effect achieved depends on both the inside diameter of the tube and its length.
  • FIGS. 4 and 5 illustrate further acoustic shunts according to the invention, which differ in two ways from a shunt which consists of an ordinary hole.
  • the representations in Figures 4 and 5 are not to scale, and the bypass is shown greatly enlarged.
  • the acoustic shunt consists of an elongated circular opening 26 which arises between the outer surface of a pin 27, 28 and the inner surface of a hole 29 into which the pin is immersed.
  • the ring width A (Fig. 6), 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 consequence of this is that the acoustic reactive resistance 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 converter, as illustrated in FIG. 1, facilitates the implementation of the pin-hole arrangement, as shown in FIGS. 4 and 5.
  • 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 attached to the support ring 10 and with the help of the same reference surfaces which are used for the Adjustment of the voice coil can be used, adjusted. Further details in connection with the manufacture and assembly of the voice coil are described in European Patent Application No. 81 302 213.4.
  • FIG. 5 Another embodiment of the pin-hole arrangement is illustrated in FIG. 5. Instead of connecting the pin to the concentrically arranged guide rod 2, the same effect can be achieved if the pin 28 (FIG. 5) 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)

Abstract

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).

Description

Die Erfindung betrifft einen elektrodynamischen Wandler mit einer von einem Befestigungsring gehaltenen Membran-Schwingspulenanordnung und einem in einem Gehäuse angeordneten Dauermagnetsystem. Ein solcher Wandler ist in der europäischen Patentanmeldung Nr. 81 302 213.4 (Veröffentlichung Nr. 0 040 948) beschrieben.The invention relates to an electrodynamic converter with a membrane voice coil arrangement held by a fastening ring and a permanent magnet system arranged in a housing. Such a transducer is described in European Patent Application No. 81 302 213.4 (Publication No. 0 040 948).

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 zugrunde Liegende Aufgabe besteht darin, einen Wandler zu schaffen, bei dem durch konstruktive Maßnahmen die unerwünschten tiefen Frequenzen bedämpft werden und somit die Empfindlichkeit des Wandlers für diese Frequenzen verringert wird.The object underlying the invention is to provide a transducer in which the undesirable low frequencies are damped by design measures and thus the sensitivity of the transducer to these frequencies is reduced.

Es ist festgestellt worden, daß die Empfindlichkeit eines Wandlers für tiefe Frequenzen dadurch verringert werden kann, daß die Membran ein kleines Loch erhält. GLeichzeitig wurde aber auch beobachtet, daß die erwünschte Wirkung von einer unerwünschten Verzerrung der tiefen Frequenzen im übertragungsbereich begleitet war. Es hat sich gezeigt, daß die Ursache für diese Verzerrungen der akustische Scheinwiderstand des Lochs in der Membran war. Der akustische Widerstand eines einzelnen Loches in einer dünnen Membran (dessen Durchmesser groß genug für die erwünschte Dämpfung ist) ist in dem Bereich der tiefen Frequenzen des übertragungsbereiches frequenzabhängig, in welchem der akustische BLindwiderstand des Loches niedrig ist.It has been found that this lowers the sensitivity of a transducer to low frequencies can give the membrane a small hole. At the same time, however, it was also observed that the desired effect was accompanied by an undesirable distortion of the low frequencies in the transmission range. It has been shown that the cause of these distortions was the acoustic impedance of the hole in the membrane. The acoustic resistance of a single hole in a thin membrane (the diameter of which is large enough for the desired damping) is frequency-dependent in the range of the low frequencies of the transmission range in which the acoustic reactive resistance of the hole is low.

Die Lösung der Aufgabe ist in den Ansprüchen enthalten.The solution to the problem is contained in the claims.

Bei der erfindungsgemäßen Lösung verschiebt sich die Frequenzabhängigkeit des akustischen Widerstandes nach höheren Frequenzen hin, während der akustische BLindwiderstand erhöht wird, wodurch der gesamte Scheinwiderstand des akustischen NebenschLusses durch die Schwingspule bei solchen Frequenzen größer ist, bei denen der akustische Widerstand 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, while the acoustic reactive resistance is increased, as a result of which the total impedance of the acoustic shunt by the voice coil 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 6 gezeigter Ausführungsbeispiele verdeutlicht. Es zeigen:

  • Fig. 1 den Schnitt durch einen bekannten Wandler,
  • Fig.2A, verschiedene Ausführungsformen der öffnungen in 2B u.2C, der Membran,
  • Fig. 3 eine andere Ausführungsform der öffnung in Form eines Rohres,
  • Fig. 4 weitere Ausführungsformen der öffnung in der und 5 Membran und
  • Fig. 6 die kreisförmige öffnung in der Membran gemäß Fig. 4 und 5.
The invention is illustrated below with reference to several exemplary embodiments shown in FIGS. 1 to 6. Show it:
  • 1 shows the section through a known converter,
  • 2A, different embodiments of the openings in 2B and 2C, the membrane,
  • 3 shows another embodiment of the opening in the form of a tube,
  • Fig. 4 further embodiments of the opening in the and 5 membrane and
  • 6 shows the circular opening in the membrane according to FIGS. 4 and 5.

Fig. 1 zeigt einen Wandler, welcher zur AusgestaLtung gemäß der Erfindung geeignet ist. Dieser Wandler besteht aus der auf dem Befestigungsring 10 angeordneten Membran-Schwingspulenanordnung 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 20.1 shows a converter which is suitable for the embodiment according to the invention. This transducer consists of the membrane voice 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 shoes 3 and 4. The converter also has a retaining ring 20.

Fig. 2A zeigt schematisch und stark vergrößert ein Ausführungsbeispiel für die Langgestreckte öffnung 21, welche konzentrisch in der Membran 13 angeordnet ist. Bei den Ausführungsbeispielen gemäß Fig. 28 und 2C sind dagegen mehrere Langgestreckte öffnungen 22, 23 vorgesehen. Es hat sich herausgestellt, daß diese Ausführungsformen für einen akustischen NebenschLuß eine weit bessere ProbLemlösung darstellen als ein einfaches zylindrisches Loch. SoLche Langgestreckten öffnungen sind aber nicht so einfach herstellbar.2A shows schematically and greatly enlarged an exemplary embodiment for the elongated opening 21, which is arranged concentrically in the membrane 13. In contrast, in the exemplary embodiments according to FIGS. 28 and 2C, several elongated openings 22, 23 are provided. It has been found that these embodiments represent a far better problem solution for an acoustic shunt than a simple cylindrical hole. However, such elongated openings are not so easy to manufacture.

In Fig. 3 ist, ebenfalls stark vergrößert, ein anderes Ausführungsbeispiel für einen akustischen NebenschLuß gezeigt, bei dem die öffnung 24 aus einem Rohrstück 25 besteht, das in einem Loch der Membran befestigt ist. Das Rohrstück 25 sollte gut in das Loch passen und dort durch einen KLeber oder dgL. befestigt sein. Im VergLeich zu einem gewöhnlichen Loch besteht der VorteiL dieser Ausführungsform darin, daß die Luftströmung durch diese öffnung nicht nur durch den Durchmesser des Rohrstücks 25 beeinflußt wird, sondern auch von der InnenfLäche des Rohrstücks, welche eine Dämpfung der Luftströmung und damit eine Vergrößerung des akustischen BLindwiderstandes bewirkt. Die erzielte Wirkung ist sowohl vom Innendurchmesser des Rohres als auch von dessen Länge abhängig.In Fig. 3, also greatly enlarged, another embodiment of an acoustic shunt is shown, in which the opening 24 be a piece of pipe 25 be stands, which is fixed in a hole in the membrane. The pipe section 25 should fit well into the hole and there through a glue or dgL. be attached. Compared to an ordinary hole, the advantage of this embodiment is that the air flow through this opening is influenced not only by the diameter of the pipe section 25, but also by the inner surface of the pipe section, which dampens the air flow and thus increases the acoustic reactive resistance causes. The effect achieved depends on both the inside diameter of the tube and its length.

In den Figuren 4 und 5 sind weitere akustische NebenschLüsse gemäß der Erfindung verdeutlicht, welche sich auf zweierlei Weise von einem NebenschLuß unterscheiden, der aus einem gewöhnlichen Loch besteht. Die Darstellungen in den Figuren 4 und 5 sind nicht maßstabsgerecht, und der NebenschLuß ist stark vergrößert dargestellt.FIGS. 4 and 5 illustrate further acoustic shunts according to the invention, which differ in two ways from a shunt which consists of an ordinary hole. The representations in Figures 4 and 5 are not to scale, and the bypass is shown greatly enlarged.

Aus den Figuren 4 und 5 ist ersichtlich, daß bei den dort dargestellten AusführungsbeispieLen der akustische Nebenschluß aus einer Langgestreckten kreisförmigen öffnung 26 besteht, welche zwischen der AußenfLäche eines Stiftes 27, 28 und der InnenfLäche eines Loches 29, in das der Stift eintaucht, entsteht.It can be seen from FIGS. 4 and 5 that in the exemplary embodiments shown there the acoustic shunt consists of an elongated circular opening 26 which arises between the outer surface of a pin 27, 28 and the inner surface of a hole 29 into which the pin is immersed.

Die Ringbreite A (Fig. 6), welche den Weg des Luftstromes durch die Membran begrenzt, ist geringer als der Durchmesser eines 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. 6), 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 consequence of this is that the acoustic reactive resistance 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 4 und 5 dargestellt ist.The annular opening 26 should preferably be arranged concentrically in the membrane. The construction of the converter, as illustrated in FIG. 1, facilitates the implementation of the pin-hole arrangement, as shown in FIGS. 4 and 5.

Bei der aus Fig. 4 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 SchwinspuLe sind in der europäischen Patentanmeldung Nr. 81 302 213.4 beschrieben.In the embodiment shown in FIG. 4, 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 attached to the support ring 10 and with the help of the same reference surfaces which are used for the Adjustment of the voice coil can be used, adjusted. Further details in connection with the manufacture and assembly of the voice coil are described in European Patent Application No. 81 302 213.4.

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 Fig. 5 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. 5) an dem HaLtering 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. 5. Instead of connecting the pin to the concentrically arranged guide rod 2, the the same effect can be achieved if the pin 28 (FIG. 5) is attached to the retaining ring 20. However, it could prove more difficult to adjust such a pin 28.

Claims (7)

1. ELektrodynamischer Wandler mit einer von einem Befestigungsring (10) gehaltenen Membran-SchwingspuLenanordnung (13, 15) und einem in einem Gehäuse (1) angeordneten Dauermagnetsystem (5,4,3), dadurch gekennzeichnet , daß die EmpfindLichkeit des Wandlers für unerwünschte niedrige Frequenzen durch einen akustischen Widerstand in Form wenigstens einer langgestreckten öffnung (21,22,23,24,26) in der Membran vermindert ist.1.Electrodynamic converter with a mounting ring (10) holding a membrane voice coil arrangement (13, 15) and a permanent magnet system (5, 4, 3) arranged in a housing (1), characterized in that the sensitivity of the converter to undesirable low levels Frequencies is reduced by an acoustic resistance in the form of at least one elongated opening (21, 22, 23, 24, 26) in the membrane. 2. Wandler nach Anspruch 1, dadurch gekennzeichnet, daß die öffnung(en) konzentrisch in der Membran angeordnet ist(sind).2. Transducer according to claim 1, characterized in that the opening (s) is (are) arranged concentrically in the membrane. 3. Wandler nach Anspruch 1, dadurch gekennzeichnet, daß die öffnung (24) aus einem in einer konzentrisch in der Membran gelegenen öffnung befestigten zylindrischen Rohr (25) besteht.3. Transducer according to claim 1, characterized in that the opening (24) consists of a cylindrical tube (25) fixed in an opening located concentrically in the membrane. 4. Wandler nach Anspruch 1, dadurch gekennzeichnet, daß die öffnung aus einem ringförmigen Raum zwischen einer zylindrischen öffnung (29) in der Membran und einem feststehend angeordneten, in diese öffnung hineinragenden Stift (27,28) besteht.4. Transducer according to claim 1, characterized in that the opening consists of an annular space between a cylindrical opening (29) in the membrane and a fixedly arranged, projecting into this opening pin (27, 28). 5. Wandler nach Anspruch 4, dadurch gekennzeichnet, daß der Stift (27,28) einen kreisförmigen Querschnitt besitzt und sein Durchmesser geringfügig kleiner aLs der Durchmesser der öffnung (29) ist.5. Transducer according to claim 4, characterized in that the pin (27, 28) has a circular cross section and its diameter is slightly smaller than the diameter of the opening (29). 6. Wandler nach Anspruch 4, dadurch gekennzeichnet, daß der Stift (27) an dem Führungsstab (2) befestigt oder einstückig mit diesem verbunden ist.6. Transducer according to claim 4, characterized in that the pin (27) on the guide rod (2) attached or integrally connected thereto. 7. WandLer nach'Anspruch 4, dadurch gekennzeichnet, daß der Stift (28) an dem HaLtering (20) befestigt oder einstückig mit diesem verbunden ist.7. converter according to claim 4, characterized in that the pin (28) is fastened to the retaining ring (20) or is integrally connected to it.
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 true EP0081780A1 (en) 1983-06-22
EP0081780B1 EP0081780B1 (en) 1986-10-01

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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)

Cited By (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
US5155773A (en) * 1989-10-09 1992-10-13 Kirk Acoustics A/S Electrodynamic transducer including inset
WO2012114159A1 (en) * 2011-02-25 2012-08-30 Nokia Corporation A transducer apparatus

Citations (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
GB819146A (en) * 1956-11-26 1959-08-26 Standard Telephones Cables Ltd Improvements in or relating to acoustic impedance devices
US2966558A (en) * 1956-10-11 1960-12-27 Hugh S Knowles Transducer and vibratory diaphragm
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
DE2322475A1 (en) * 1972-02-09 1974-11-21 Lehner Fernsprech Signal ELECTROACOUSTIC CONVERTER, IN PARTICULAR FOR TELEPHONE AND TELEPHONE CAPSULES OF TELEPHONE SETS

Patent Citations (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
US2966558A (en) * 1956-10-11 1960-12-27 Hugh S Knowles Transducer and vibratory diaphragm
GB819146A (en) * 1956-11-26 1959-08-26 Standard Telephones Cables Ltd Improvements in or relating to acoustic impedance devices
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
DE2322475A1 (en) * 1972-02-09 1974-11-21 Lehner Fernsprech Signal ELECTROACOUSTIC CONVERTER, IN PARTICULAR FOR TELEPHONE AND TELEPHONE CAPSULES OF TELEPHONE SETS

Cited By (4)

* 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
US5155773A (en) * 1989-10-09 1992-10-13 Kirk Acoustics A/S Electrodynamic transducer including inset
WO2012114159A1 (en) * 2011-02-25 2012-08-30 Nokia Corporation A transducer apparatus
US9271067B2 (en) 2011-02-25 2016-02-23 Nokia Technologies Oy Transducer apparatus having a mechanical acoustic filter with movable blocking member

Also Published As

Publication number Publication date
DK547381A (en) 1983-06-11
DE3273600D1 (en) 1986-11-06
EP0081780B1 (en) 1986-10-01
DK148550C (en) 1986-04-21
DK148550B (en) 1985-07-29
AU9113282A (en) 1983-06-16
AU556443B2 (en) 1986-11-06
NZ202625A (en) 1985-08-16

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