EP0604766B1 - Moving coil-bonding for loudspeakers - Google Patents

Moving coil-bonding for loudspeakers Download PDF

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Publication number
EP0604766B1
EP0604766B1 EP93119081A EP93119081A EP0604766B1 EP 0604766 B1 EP0604766 B1 EP 0604766B1 EP 93119081 A EP93119081 A EP 93119081A EP 93119081 A EP93119081 A EP 93119081A EP 0604766 B1 EP0604766 B1 EP 0604766B1
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EP
European Patent Office
Prior art keywords
intermediate piece
loudspeaker
collar
voice coil
pole core
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EP93119081A
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German (de)
French (fr)
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EP0604766A3 (en
EP0604766A2 (en
Inventor
Hermann Gruber
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Nokia Technology GmbH
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Nokia Technology GmbH
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Publication of EP0604766A3 publication Critical patent/EP0604766A3/en
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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
    • H04R1/06—Arranging circuit leads; Relieving strain on circuit leads
    • 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
    • H04R9/06—Loudspeakers

Definitions

  • the invention is concerned with the voice coil contacting of loudspeakers, in particular with the contacting of thermally highly stressed loudspeakers.
  • Cone loudspeakers are essentially formed by a magnet system, a conical membrane and a loudspeaker basket.
  • the speaker basket is usually connected to the upper pole plate of the magnet system.
  • the membrane is inserted into the loudspeaker basket and its large diameter connects it to the upper edge of the loudspeaker basket via a circumferential bead.
  • the tubular voice coil former is attached to the small diameter of the membrane.
  • the outer surface of this voice coil bobbin is wrapped with the voice coil.
  • the voice coil or the small diameter of the membrane is plate-shaped with a plan view and in Provide a cross section of an accordion-shaped centering membrane.
  • the outer edge of the centering membrane is connected to the speaker basket. So that the centering membrane has centering capabilities on the one hand and on the other hand does not hinder the stroke of the membrane or only impedes it proportionally to the lifting height, centering membranes are generally formed from a resin-impregnated woven fabric.
  • the resilience of the vibrating membrane is characterized by the spring properties of the centering membrane and the bead, which takes over the outer suspension of the membrane.
  • At least one rod is provided for centering and guiding the membrane, on which at least one sleeve is slidably arranged.
  • the respective sleeve can be connected to the membrane by means of an intermediate piece.
  • two collars are provided to limit the displacement of the sleeve on the respective rod, which are mutually axially connected to the rod.
  • connection contact of the voice coil is solved in such a way that a terminal strip is attached to the speaker cage, from which the so-called speaker wires are guided to the winding ends of the voice coils in a self-supporting manner.
  • the speaker strands can also be guided on the top or bottom of the membrane with partial gluing to the winding ends of the voice coil. Solutions are also known in which the voice coil contact is made through the pole core or in which the speaker strands are woven into the centering membrane are.
  • the speaker strands are formed from a wire mesh, which is woven around a core made of plastic. Cadmium can be added to this material in order to increase the bending capacity of the material from which the wire mesh is formed.
  • the voice coil contact is formed according to claim 1, it is possible to connect the leads coming from an amplifier to the winding ends of the voice coil without the lead cables having to be stranded at any point. This makes the voice coil contact extremely resistant to thermal loads.
  • the centering membrane can also be omitted. This eliminates the problems that otherwise occur in connection with centering membranes above 80 ° C.
  • the voice coil contact according to the invention there are no losses in the reproduction quality if the loudspeakers are used to reproduce long-stroke sound signals. Due to the extraordinarily high temperature resistance of the voice coil contact, the speakers designed in this way can also be used in Operate rooms with a high temperature level for an extraordinarily long period of time. This training is particularly important in the field of "Active Noise Cancellation". This is because, in order to cancel out ambient noise, the loudspeakers have to be arranged at locations that sometimes have a high ambient temperature. For example, the arrangement of loudspeakers in the engine compartment or in exhaust systems of motor vehicles is mentioned.
  • the leads are guided through openings running along the center axis of the loudspeaker in the pole core, the small diameter of the membrane can be hermetically sealed with a dust protection cap.
  • a dust protection cap can be protected against aggressive media such as air or gases by appropriate coatings.
  • a particularly simple way of contacting the springs is specified in claim 3, in which the collar and the intermediate piece together with the sleeve are formed from insulating material and on the sides of the collar and the intermediate piece, which face the spiral springs, disks made of electrically conductive material are.
  • FIG. 1 shows a drive system 10 for loudspeakers.
  • the magnet system of this loudspeaker is only indicated in this illustration and shows only the upper pole plate 11 and the pole core 12.
  • the pole plate 11 and the pole core 12 are arranged centrally to the loudspeaker central axis 13.
  • the air gap 14 of the magnet system is formed between the outer jacket of the pole core 12 and the flanks of the pole plate 11.
  • the conical membrane 15 is arranged centrally to the loudspeaker center axis.
  • the large diameter of the membrane 15 is connected to the upper edge of the loudspeaker frame via a bead (not shown).
  • the tubular voice coil former 16 is attached and connected to the small diameter of the membrane 15.
  • the free end of the voice coil bobbin 16 protrudes into the air gap 14.
  • the voice coil 17 is wound around the outer jacket of the voice coil bobbin 16.
  • a rod 18 is placed centrally to the loudspeaker center axis 13 and in the direction of the diaphragm 15, which in the exemplary embodiment shown here for fastening reasons until it is inserted into the pole core 12.
  • the free rag length of the rod 18 is limited at the top and bottom - facing the pole core 12 - in each case with a collar 19 O, 19 U formed of insulating material.
  • a sleeve 20 is slidably arranged on the rod 18, which in the exemplary embodiment shown here is connected in one piece to a plate-shaped intermediate piece 21.
  • the outer periphery of the intermediate piece 21 is connected to the inner jacket of the voice coil bobbin 16.
  • On the upper and lower side 22 O, 22 U of the intermediate piece 22 discs 23 made of electrically conductive material are placed and fastened.
  • the collars 19 O, 19 U are also provided with disks 23 on their sides facing the intermediate piece 21.
  • a spiral spring 24 O, 24 U clamped from electrically conductive material.
  • the two winding ends 25 of the voice coil 17 are guided to the disks 23 arranged on the intermediate piece 21, one winding end 25 with the disk 23 on the top 22 O and the other winding end 25 with the disk 23 on the underside 22 U of the intermediate piece 21 being conductive connected is.
  • the two feed lines 26 coming from the signal source are passed through the bell of the diaphragm 15 to the washers 23 on the collars 19 O and 19 U, one feed line 26 being electrically conductively connected to the washer 23 of the collar 19 O and the other feed line being connected to the washer 23 of the collar 19 U. . So that the movement of the voice coil 17 or the diaphragm 15 is not hindered by the feed line 26 leading to the disk 23 of the lower collar 19 U, the intermediate piece 21 has a corresponding opening through which this feed line 26 is passed.
  • FIG. 2 largely corresponds to the exemplary embodiment according to FIG. 1, so that components which have already been explained in connection with FIG. 1 are designated by the reference numerals used in connection with FIG. 2 and not further explained.
  • This type of routing of the supply lines 26 to the respective disks 23 allows the smaller diameter of the membrane 15 to be hermetically sealed by means of a dust protection cap 28. As a result, the entire drive system 10 can be encapsulated. This is advantageous if the membrane 15 emits in dust-laden rooms.
  • This dust protection cap 28 could also close the small diameter of the membrane 15 in the exemplary embodiment according to FIG. 1. It would be disadvantageous, however, that the supply lines 26 must be guided through the dust protection cap 28 and rub the opening areas in the dust protection cap 28 along the supply lines 26 during operation if the bushing is to be dust-tight. The latter on the one hand hinders the stroke of the membrane 15 and, on the other hand, has the effect that the dust tightness does not last long.

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

Description

Technisches GebietTechnical field

Die Erfindung befaßt sich mit der Schwingspulenkontaktierung von Lautsprechern, insbesondere mit der Kontaktierung von thermisch hochbelasteten Lautsprechern.The invention is concerned with the voice coil contacting of loudspeakers, in particular with the contacting of thermally highly stressed loudspeakers.

Stand der TechnikState of the art

Antriebssysteme von Lautsprechern sind im Stand der Technik seit langem bekannt, so daß an dieser Stelle deren Beschreibung auf ein Mindestmaß beschränkt werden kann.Drive systems for loudspeakers have long been known in the prior art, so that their description can be kept to a minimum here.

Konuslautsprecher werden im wesentlichen von einem Magnetsystem, einer konischen Membran und einem Lautsprecherkorb gebildet. Der Lautsprecherkorb ist zumeist mit der oberen Polplatte des Magnetsystems verbunden. Die Membran ist in den Lautsprecherkorb eingesetzt und mit ihrem großen Durchmesser mit dem oberen Rand des Lautsprecherkorbes über eine umlaufende Sicke verbunden. An dem kleinen Durchmesser der Membran ist der rohrförmig ausgebildete Schwingspulenträger angesetzt. Die äußere Mantelfläche dieses Schwingspulenträgers ist mit der Schwingspule umwickelt. Ist der Lautsprecher montiert, taucht das freie nicht mit der Membran verbundene Ende des Schwingspulenträgers in den Luftspalt des Magnetsystems ein, der dort durch die gegenseitige Beabstandung von oberer Polplatte und Polkern gebildet ist. Damit die Membran während des Betriebs des Lautsprechers eine zentrische Lage zur Lautsprechermittelachse beibehält und verhindert wird, daß beispielsweise das freie Ende des Schwingspulenträgers nach einem Aufwärtshub auf der oberen Polplatte aufsetzt, ist die Schwingspule oder der kleine Durchmesser der Membran mit einer in Draufsicht tellerförmig und im Querschnitt ziehharmonikaförmig ausgebildeten Zentriermembran versehen. Der äußere Rand der Zentriermembran ist mit dem Lautsprecherkorb verbunden. Damit die Zentriermembran einerseits Zentrierfähigkeiten besitzt und andererseits den Hub der Membran nicht oder nur proportional zur Hubhöhe behindert, sind Zentriermembranen im allgemeinen aus einem harzgetränkten Gewebegeflecht gebildet. Die Federeigenschaften der Zentriermembran und der Sicke, welche die äußere Aufhängung der Membran übernimmt, kennzeichnen die Nachgiebigkeit der schwingenden Membran.Cone loudspeakers are essentially formed by a magnet system, a conical membrane and a loudspeaker basket. The speaker basket is usually connected to the upper pole plate of the magnet system. The membrane is inserted into the loudspeaker basket and its large diameter connects it to the upper edge of the loudspeaker basket via a circumferential bead. The tubular voice coil former is attached to the small diameter of the membrane. The outer surface of this voice coil bobbin is wrapped with the voice coil. When the loudspeaker is mounted, the free end of the voice coil carrier, which is not connected to the membrane, is immersed in the air gap of the magnet system, which is formed there by the mutual spacing of the upper pole plate and the pole core. So that the membrane maintains a central position to the loudspeaker central axis during operation of the loudspeaker and prevents, for example, that the free end of the voice coil bobbin touches the upper pole plate after an upward stroke, the voice coil or the small diameter of the membrane is plate-shaped with a plan view and in Provide a cross section of an accordion-shaped centering membrane. The outer edge of the centering membrane is connected to the speaker basket. So that the centering membrane has centering capabilities on the one hand and on the other hand does not hinder the stroke of the membrane or only impedes it proportionally to the lifting height, centering membranes are generally formed from a resin-impregnated woven fabric. The resilience of the vibrating membrane is characterized by the spring properties of the centering membrane and the bead, which takes over the outer suspension of the membrane.

Eine andere und den Obergriff der vorliegenden Anmeldung bestimmende Zentrierung der Membran ist aus US-A 4.327.257 bekannt. Gemäß dieser Schrift ist zur Zentrierung und Führung der Membran zumindest eine Stange vorgesehen, auf welcher zumindest eine Hülse verschiebbar angeordnet ist. Je nach Ausbildung der Anordnung kann die jeweilige Hülse mittels eines Zwischenstücks mit der Membran verbunden sein. Ferner sind zur Begrenzung des Verschiebewegs der Hülse auf der jeweiligen Stange zwei Kragen vorgesehen, welche zueinander in gegenseitigem Axialabstand mit der Stange verbunden sind.Another centering of the membrane, which determines the overall grip of the present application, is known from US-A 4,327,257. According to this document, at least one rod is provided for centering and guiding the membrane, on which at least one sleeve is slidably arranged. Depending on the design of the arrangement, the respective sleeve can be connected to the membrane by means of an intermediate piece. Furthermore, two collars are provided to limit the displacement of the sleeve on the respective rod, which are mutually axially connected to the rod.

Die Anschlußkontaktierung der Schwingspule ist so gelöst, daß am Lautsprecherkorb eine Anschlußleiste angesetzt ist, von der aus die sogenannten Lautsprecherlitzen freitragend zu den Wickelenden der Schwingspulen geführt sind. Gemäß weiterer hierzu bekannter Lösungen können die Lautsprecherlitzen auch an der Ober- oder Unterseite der Membran unter teilweiser Verklebung mit dieser zu den Wickelenden der Schwingspule geführt sein. Auch sind Lösungen bekannt, bei denen die Schwingspulenkontaktierung durch den Polkern erfolgt bzw. bei denen die Lautsprecherlitzen in der Zentriermembran eingewoben sind. Unabhängig von der konkreten Art der Realisierung erfordert dies aber Litzen, die zum einen durch ihre Flexibilität den Hubbewegungen der Membran bzw. der Schwingspule ohne Behinderung folgen und zum weiteren - trotz ihrer Flexibilität - unter der vom Hub hervorgerufenen Biege-Wechsel-Belastungen hohe Standzeiten im Bezug auf Litzenbrüche haben. Deshalb werden die Lautsprecherlitzen aus einem Drahtgeflecht gebildet, welches um eine aus Kunststoff gebildete Seele gewoben ist. Zur Erhöhung der Biege-Wechsel-Belastbarkeit des Materials, aus dem das Drahtgeflecht gebildet ist, kann diesem Material Kadmium zugesetzt sein.The connection contact of the voice coil is solved in such a way that a terminal strip is attached to the speaker cage, from which the so-called speaker wires are guided to the winding ends of the voice coils in a self-supporting manner. According to further solutions known for this purpose, the speaker strands can also be guided on the top or bottom of the membrane with partial gluing to the winding ends of the voice coil. Solutions are also known in which the voice coil contact is made through the pole core or in which the speaker strands are woven into the centering membrane are. Regardless of the specific type of implementation, this requires strands, which on the one hand follow the lifting movements of the membrane or the voice coil without hindrance due to their flexibility and, on the other hand - despite their flexibility - long service life under the bending and alternating loads caused by the stroke Regarding strand breaks. Therefore, the speaker strands are formed from a wire mesh, which is woven around a core made of plastic. Cadmium can be added to this material in order to increase the bending capacity of the material from which the wire mesh is formed.

Abgesehen davon, daß der Einsatz von Kadmium aus Umweltgesichtspunkten nicht unproblematisch ist, wird außerdem als nachteilig empfunden, daß die Lebensdauer von Lautsprecher im vorbeschriebenen Sinne bei Umgebungstemperaturen über 80° C nur sehr gering ist. Dies ist darauf zurückzuführen, daß zum einen die Zentriermembran bei diesen Temperaturen nach kurzer Zeit ihre oben angeführten Eigenschaften verliert und die Kunststoffseelen der Lautsprecherlitzen altern. Letzteres führt dazu, daß die Lautsprecherlitzen sehr schnell brechen und damit die Kontaktierung zwischen der Anschlußleiste und der Schwingspule unterbrechen. Daher liegt der Erfindung die Aufgabe zugrunde, einen Lautsprecher anzugeben, dessen Schwingspulenkontaktierung unter Dauerbelastung und Umgebungstemperaturen bis zu 150° C für lange Zeit beständig bleibt.In addition to the fact that the use of cadmium is not unproblematic from an environmental point of view, it is also found to be disadvantageous that the lifespan of loudspeakers in the sense described above is only very short at ambient temperatures above 80 ° C. This is due to the fact that on the one hand the centering membrane loses its properties mentioned above at these temperatures after a short time and the plastic cores of the speaker wires age. The latter leads to the speaker wires breaking very quickly and thus interrupting the contact between the terminal block and the voice coil. It is therefore the object of the invention to provide a loudspeaker whose voice coil contact remains stable under long-term stress and ambient temperatures of up to 150 ° C. for a long time.

Darstellung der ErfindungPresentation of the invention

Diese Aufgabe wird mit den in Anspruch 1 angegebenen Merkmalen gelöst. Vorteilhafte Aus- und Weiterbildungen der Erfindung sind den Ansprüchen 2 und 3 entnehmbar.This object is achieved with the features specified in claim 1. Advantageous training and further education the invention can be found in claims 2 and 3.

Wird die Schwingspulenkontaktierung gemäß Anspruch 1 ausgebildet, ist es möglich, die von einem Verstärker kommenden Zuleitungen mit den Wicklungsenden der Schwingspule zu verbinden, ohne daß die Zuleitungskabel an irgendeiner Stelle litzenförmig ausgebildet sein müssen. Dies macht die Schwingspulenkontaktierung außerordentlich resistent gegenüber thermischen Belastungen.If the voice coil contact is formed according to claim 1, it is possible to connect the leads coming from an amplifier to the winding ends of the voice coil without the lead cables having to be stranded at any point. This makes the voice coil contact extremely resistant to thermal loads.

Ganz besonders vorteilhaft ist es, daß nach der Erfindung auch die Zentriermembran weggelassen werden kann. Hierdurch sind die Probleme beseitigt, die sonst im Zusammenhang mit Zentriermembranen oberhalb von 80° C auftreten. Durch die Verwendung der erfindungsgemäßen Schwingspulenkontaktierung sind keine Einbußen in der Wiedergabequalität zu verzeichnen, wenn die Lautsprecher zur Wiedergabe langhubiger Tonsignale eingesetzt werden. Bedingt durch die außerordentliche hohe Temperaturbelastbarkeit der Schwingspulenkontaktierung lassen sich die so ausgestalteten Lautsprecher auch in Räumen mit hohem Temperaturniveau über einen außerordentlich langen Zeitraum betreiben. Diese Ausbildung gewinnt auf dem Gebiet "Active Noise Cancellation" besondere Bedeutung. Dies deshalb, weil zur Auslöschung von Umgebungsgeräusche die Lautsprecher an Stellen angeordnet werden müssen, die mitunter eine hohe Umgebungstemperatur aufweisen. Beispielsweise sei hierfür die Anordnung von Lautsprechern im Motorraum oder in Auspuffanlagen von Kraftfahrzeugen genannt.It is very particularly advantageous that, according to the invention, the centering membrane can also be omitted. This eliminates the problems that otherwise occur in connection with centering membranes above 80 ° C. By using the voice coil contact according to the invention, there are no losses in the reproduction quality if the loudspeakers are used to reproduce long-stroke sound signals. Due to the extraordinarily high temperature resistance of the voice coil contact, the speakers designed in this way can also be used in Operate rooms with a high temperature level for an extraordinarily long period of time. This training is particularly important in the field of "Active Noise Cancellation". This is because, in order to cancel out ambient noise, the loudspeakers have to be arranged at locations that sometimes have a high ambient temperature. For example, the arrangement of loudspeakers in the engine compartment or in exhaust systems of motor vehicles is mentioned.

Sind gemäß Anspruch 2 die Zuleitungen durch längs der Lautsprechermittelachse im Polkern verlaufende Öffnungen geführt, kann der kleine Durchmesser der Membran mit einer Staubschutzkalotte hermetisch verschlossen werden. Zusammen mit einer entsprechenden Konstruktion des Lautsprecherkorbes kann damit der gesamte Innenraum des Lautsprechers von dem Raum separiert werden, in welchen die Lautsprechermembran abstrahlt. Dies ist besonders in den Fällen wichtig, in denen der Lautsprecher in staubbelasteten Räumen eingesetzt wird. Weiter läßt sich die Oberfläche der Membran und der Staubschutzkalotte durch entsprechende Beschichtungen gegen aggressive Medien, wie zum Beispiel Luft oder Gase schützen.If, according to claim 2, the leads are guided through openings running along the center axis of the loudspeaker in the pole core, the small diameter of the membrane can be hermetically sealed with a dust protection cap. Together with a corresponding construction of the loudspeaker basket, the entire interior of the loudspeaker can thus be separated from the space in which the loudspeaker diaphragm emits. This is particularly important in cases where the loudspeaker is used in dusty rooms. Furthermore, the surface of the membrane and the dust protection cap can be protected against aggressive media such as air or gases by appropriate coatings.

Eine besonders einfache Art der Kontaktierung der Federn ist in Anspruch 3 angegeben, in dem die Kragen und das Zwischenstück mitsamt der Hülse aus Isolierstoffmaterial gebildet sind und an den Seiten der Kragen und des Zwischenstücks, die den Spiralfedern zugewandt sind, Scheiben aus elektrisch leitfähigem Material angeordnet sind.A particularly simple way of contacting the springs is specified in claim 3, in which the collar and the intermediate piece together with the sleeve are formed from insulating material and on the sides of the collar and the intermediate piece, which face the spiral springs, disks made of electrically conductive material are.

Kurze Darstellung der FigurenBrief presentation of the figures

Es zeigen:

Figur 1
einen durch den Mittelpunkt eines Lautsprechers verlaufenden Schnitt, wobei aus Gründen der Übersichtlichkeit nicht alle Schnittflächen schraffiert worden sind und
Figur 2
eine weitere Darstellung gemäß Figur 1.
Show it:
Figure 1
a cut running through the center of a loudspeaker, whereby not all cut surfaces have been hatched for reasons of clarity and
Figure 2
another representation according to FIG. 1.

Wege zum Ausführen der ErfindungWays of Carrying Out the Invention

Die in Figur 1 gezeigte Darstellung zeigt ein Antriebssystem 10 für Lautsprecher. Das Magnetsystem dieses Lautsprechers ist in dieser Darstellung nur angedeutet und zeigt nur die obere Polplatte 11 und den Polkern 12. Die Polplatte 11 und der Polkern 12 sind zentrisch zur Lautsprechermittelachse 13 angeordnet. Zwischen dem Außenmantel des Polkerns 12 und den Flanken der Polplatte 11 ist der Luftspalt 14 des Magnetsystems gebildet. Oberhalb des Magnetsystems ist zentrisch zur Lautsprechermittelachse die konische Membran 15 angeordnet. Der große Durchmesser der Membran 15 ist mit dem oberen Rand des Lautsprecherkorbes über eine Sicke umlaufend verbunden (nicht dargestellt). Am kleinen Durchmesser der Membran 15 ist der rohrförmig ausgebildete Schwingspulenträger 16 angesetzt und verbunden. Das freie Ende des Schwingspulenträgers 16 ragt in den Luftspalt 14 hinein. Um den Außenmantel des Schwingspulenträgers 16 ist die Schwingspule 17 gewickelt. Auf dem Polkern 12 ist zentrisch zur Lautsprechermittelachse 13 und mit Richtung zur Membran 15 eine Stange 18 aufgesetzt, die im hier dargestellten Ausführungsbeispiel aus Befestigungsgründen bis in den Polkern 12 hineingeführt ist. Die freie Raglänge der Stange 18 ist am oberen und unteren - dem Polkern 12 zugewandten - Ende jeweils mit einem aus Isolierstoffmaterial gebildeten Kragen 19 O, 19 U begrenzt. Auf der Stange 18 ist verschiebbar eine Hülse 20 angeordnet, die im hier dargestellten Ausführungsbeispiel einstückig mit einem tellerförmigen Zwischenstück 21 verbunden ist. Der äußere Umfang des Zwischenstücks 21 ist mit dem Innenmantel des Schwingspulenträgers 16 verbunden. Auf der oberen und unteren Seite 22 O, 22 U des Zwischenstücks 22 sind Scheiben 23 aus elektrisch leitfähigem Material aufgesetzt und befestigt. Auch die Kragen 19 O, 19 U sind an ihrem dem Zwischenstück 21 zugewandten Seiten mit Scheiben 23 versehen. Zwischen der Scheibe 23 an dem oberen Kragen 19 O und der Scheibe 23 an der Oberseite 22 O des Zwischenstücks 21 sowie zwischen der Scheibe 23 an dem unteren Kragen 19 U und an der Scheibe 23 der Unterseite 22 U des Zwischenstücks 21 ist jeweils eine Spiralfeder 24 O, 24 U aus elektrisch leitfähigen Material eingespannt. Diese Federn 24, welche aus Gründen der Einhaltung von Gleichgewichtsbedingungen gleiche Länge, gleiche Dicke und gleiche Steigung haben, kontaktieren die an jeder Seite des Zwischenstücks 21 angeordneten Scheiben 23 mit den jeweiligen und an den Kragen 19 O, 19 U befestigten Scheiben 23.The illustration shown in FIG. 1 shows a drive system 10 for loudspeakers. The magnet system of this loudspeaker is only indicated in this illustration and shows only the upper pole plate 11 and the pole core 12. The pole plate 11 and the pole core 12 are arranged centrally to the loudspeaker central axis 13. The air gap 14 of the magnet system is formed between the outer jacket of the pole core 12 and the flanks of the pole plate 11. Above the magnet system, the conical membrane 15 is arranged centrally to the loudspeaker center axis. The large diameter of the membrane 15 is connected to the upper edge of the loudspeaker frame via a bead (not shown). The tubular voice coil former 16 is attached and connected to the small diameter of the membrane 15. The free end of the voice coil bobbin 16 protrudes into the air gap 14. The voice coil 17 is wound around the outer jacket of the voice coil bobbin 16. On the pole core 12, a rod 18 is placed centrally to the loudspeaker center axis 13 and in the direction of the diaphragm 15, which in the exemplary embodiment shown here for fastening reasons until it is inserted into the pole core 12. The free rag length of the rod 18 is limited at the top and bottom - facing the pole core 12 - in each case with a collar 19 O, 19 U formed of insulating material. A sleeve 20 is slidably arranged on the rod 18, which in the exemplary embodiment shown here is connected in one piece to a plate-shaped intermediate piece 21. The outer periphery of the intermediate piece 21 is connected to the inner jacket of the voice coil bobbin 16. On the upper and lower side 22 O, 22 U of the intermediate piece 22 discs 23 made of electrically conductive material are placed and fastened. The collars 19 O, 19 U are also provided with disks 23 on their sides facing the intermediate piece 21. Between the washer 23 on the upper collar 19 O and the washer 23 on the upper side 22 O of the intermediate piece 21 and between the washer 23 on the lower collar 19 U and on the washer 23 of the lower side 22 U of the intermediate piece 21 is a spiral spring 24 O, 24 U clamped from electrically conductive material. These springs 24, which have the same length, thickness and pitch for reasons of maintaining equilibrium conditions, contact the disks 23 arranged on each side of the intermediate piece 21 with the respective disks 23 fastened to the collars 19 O, 19 U.

Die beiden Wickelenden 25 der Schwingspule 17 sind zu den an dem Zwischenstück 21 angeordneten Scheiben 23 geführt, wobei ein Wickelende 25 mit der Scheibe 23 an der Oberseite 22 O und das andere Wickelende 25 mit der Scheibe 23 an der Unterseite 22 U des Zwischenstücks 21 leitend verbunden ist.The two winding ends 25 of the voice coil 17 are guided to the disks 23 arranged on the intermediate piece 21, one winding end 25 with the disk 23 on the top 22 O and the other winding end 25 with the disk 23 on the underside 22 U of the intermediate piece 21 being conductive connected is.

Die beiden von der Signalquelle kommenden Zuleitungen 26 sind durch den Schalltrichter der Membran 15 zu den Scheiben 23 an die Kragen 19 O und 19 U geführt, wobei die eine Zuleitung 26 mit der Scheibe 23 des Kragens 19 O und die andere Zuleitung mit der Scheibe 23 des Kragens 19 U elektrisch leitend verbunden ist. Damit die Bewegung der Schwingspule 17 bzw. der Membran 15 durch die zur Scheibe 23 des unteren Kragens 19 U geführten Zuleitung 26 nicht behindert wird, weist das Zwischenstück 21 eine entsprechende Öffnung auf, durch welche diese Zuleitung 26 hindurchgeführt ist.The two feed lines 26 coming from the signal source are passed through the bell of the diaphragm 15 to the washers 23 on the collars 19 O and 19 U, one feed line 26 being electrically conductively connected to the washer 23 of the collar 19 O and the other feed line being connected to the washer 23 of the collar 19 U. . So that the movement of the voice coil 17 or the diaphragm 15 is not hindered by the feed line 26 leading to the disk 23 of the lower collar 19 U, the intermediate piece 21 has a corresponding opening through which this feed line 26 is passed.

Werden die Zuleitungen 26 mit Tonsignalen beaufschlagt und dadurch die Schwingspule 17 in Hubbewegungen versetzt, so ist offensichtlich, daß die Kontaktierung der Schwingspule weder auf Biege-Wechsel-Belastungen beanspruchte Litzen oder Zuleitungen 26 erfordert, da die Kontaktierung mittels der für die Hubbewegungen ausgelegten und somit bruchunempfindlichen Federn 24 bewirkt wird. Versuche haben gezeigt, daß diese Art der Kontaktierung von Schwingspulen unter Vollast und Umgebungstemperaturen von 150° C eine außerordentlich hohe Lebensdauer aufweisen.If the feed lines 26 are acted upon by sound signals and the voice coil 17 is thereby set into lifting movements, it is obvious that the contacting of the voice coil does not require strands or leads 26 which are subjected to alternating bending stresses, since the contacting is made by means of the designed for the lifting movements and thus break-resistant springs 24 is caused. Experiments have shown that this type of contacting of voice coils has an extremely long service life under full load and ambient temperatures of 150 ° C.

Dadurch, daß die Hülse 20 zusammen mit der Stange 18 die Zentrierung des Systems gewährleistet, sind auch die Probleme gelöst, die sonst im Zusammenhang mit Zentriermembranen in diesem Temperaturbereich entstehen.The fact that the sleeve 20 together with the rod 18 ensures the centering of the system also solves the problems which otherwise arise in connection with centering membranes in this temperature range.

Das in Figur 2 gezeigte Ausführungsbeispiel entspricht weitgehend dem Ausführungsbeispiel gemäß Figur 1, so daß durch die im Zusammenhang mit Figur 2 verwendeten und nicht weiter erläuterten Bezugszeichen Bauteile bezeichnet werden, die bereits im Zusammenhang mit Figur 1 erläutert wurden.The exemplary embodiment shown in FIG. 2 largely corresponds to the exemplary embodiment according to FIG. 1, so that components which have already been explained in connection with FIG. 1 are designated by the reference numerals used in connection with FIG. 2 and not further explained.

Abweichend von Figur 1 sind in Figur 2 die Zuleitungen 26 durch im Polkern 12 eingelassene Öffnungen 27 geführt.In a departure from FIG. 1, in FIG. 2 the feed lines 26 are guided through openings 27 embedded in the pole core 12.

Diese Art der Führung der Zuleitungen 26 zu den jeweiligen Scheiben 23 erlaubt es, den kleineren Durchmesser der Membran 15 mittels einer Staubschutzkalotte 28 hermetisch zu verschließen. Dadurch kann das gesamte Antriebssystem 10 gekapselt ausgebildet werden. Dies ist dann von Vorteil, wenn die Membran 15 in staubbelastete Räume abstrahlt.This type of routing of the supply lines 26 to the respective disks 23 allows the smaller diameter of the membrane 15 to be hermetically sealed by means of a dust protection cap 28. As a result, the entire drive system 10 can be encapsulated. This is advantageous if the membrane 15 emits in dust-laden rooms.

Diese Staubschutzkalotte 28 könnte auch im Ausführungsbeispiel gemäß Figur 1 den kleinen Durchmesser der Membran 15 verschließen. Nachteilig wäre dabei aber, daß die Zuleitungen 26 durch die Staubschutzkalotte 28 geführt werden müssen und im Betrieb, wenn die Durchführung staubdicht sein soll, die Öffnungsbereiche in der Staubschutzkalotte 28 an den Zuleitungen 26 entlang reiben. Letzteres behindert zum einen den Hub der Membran 15 und bewirkt zum weiteren, daß die Staubdichtheit nicht lange vorhält.This dust protection cap 28 could also close the small diameter of the membrane 15 in the exemplary embodiment according to FIG. 1. It would be disadvantageous, however, that the supply lines 26 must be guided through the dust protection cap 28 and rub the opening areas in the dust protection cap 28 along the supply lines 26 during operation if the bushing is to be dust-tight. The latter on the one hand hinders the stroke of the membrane 15 and, on the other hand, has the effect that the dust tightness does not last long.

Claims (3)

  1. Loudspeaker with
    - a magnet system comprising a pole core (12) that is centric with respect to the centre axis (13) of the loudspeaker and
    - with a diaphragm (15), to one end of which a voice coil (17) is attached,
    characterised in that
    - the lower end of a rod (18) is inserted in the pole core (12), the free upper end of said rod and the lower region of said rod facing the pole core are each provided with a collar (19 O, 19 U), the lower collar (19 U) resting on the pole core,
    - a bushing (20) is arranged displaceably on the rod (18), said bushing being connected via an intermediate piece (21) to the diaphragm (15) or to the voice-coil support (16),
    - between the upper side (22 O) of the intermediate piece (21) and the upper collar (19 O) and also between the underside (22 U) of the intermediate piece (21) and the lower collar (19 U) there is arranged in each case a helical spring (24 O, 24 U) formed from electrically conductive material and extending along the rod (18) and
    - the electrical contact of one winding end (25) of the voice coil (17) together with the lower helical spring (24 U) is formed on the underside (22 U) of the intermediate piece (21) and the contact of the other winding end (25) together with the upper helical spring (24 O) is formed on the upper side (22 O) of the intermediate piece (21) and one feed wire (26) stemming from the signal source is conductively connected at the upper collar (19 O) to the upper helical spring (24 O) and the other feed wire (26) is conductively connected at the lower collar (19 U) to the lower helical spring (24 U).
  2. Loudspeaker according to Claim 1,
    characterised in that
    the feed wires (26) are guided through holes (27) extending along the centre axis (13) of the loudspeaker in the pole core (12).
  3. Loudspeaker according to Claim 1 or Claim 2,
    characterised in that
    the collars (19 U, 19 O), the bushing (20) and the intermediate piece (21) are formed from insulating material and on the sides of the collars (19 O, 19 U) and of the intermediate piece (21) facing the helical springs (24 O, 24 U) in each case a disk (23) made of electrically conductive material is provided.
EP93119081A 1992-12-08 1993-11-26 Moving coil-bonding for loudspeakers Expired - Lifetime EP0604766B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4241212A DE4241212A1 (en) 1992-12-08 1992-12-08 Drive system for moving coil loudspeakers - has moving coil supplied by central contact discs with coil springs loading carrier coupled to coil
DE4241212 1992-12-08

Publications (3)

Publication Number Publication Date
EP0604766A2 EP0604766A2 (en) 1994-07-06
EP0604766A3 EP0604766A3 (en) 1995-01-25
EP0604766B1 true EP0604766B1 (en) 1997-02-19

Family

ID=6474633

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93119081A Expired - Lifetime EP0604766B1 (en) 1992-12-08 1993-11-26 Moving coil-bonding for loudspeakers

Country Status (3)

Country Link
EP (1) EP0604766B1 (en)
JP (1) JPH077793A (en)
DE (2) DE4241212A1 (en)

Cited By (1)

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Publication number Priority date Publication date Assignee Title
RU210726U1 (en) * 2021-09-06 2022-04-28 Олег Григорьевич Лобанов LINEAR DYNAMIC SPEAKER

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Publication number Priority date Publication date Assignee Title
DE4419312A1 (en) * 1994-06-01 1995-12-07 Nokia Deutschland Gmbh speaker
DE4437476A1 (en) * 1994-10-20 1996-05-02 Nokia Deutschland Gmbh Connecting line
FR3067201B1 (en) * 2017-05-30 2020-03-13 Devialet ELECTRODYNAMIC SPEAKER HAVING INTERNAL POWER SUPPLY WIRES IN RELATION TO THE COIL HOLDER
JP7226982B2 (en) * 2018-12-07 2023-02-21 フォルシアクラリオン・エレクトロニクス株式会社 vibration generator

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US4327257A (en) * 1979-09-10 1982-04-27 Schwartz Leslie H Alignment device for electro-acoustical transducers
DE2946981C2 (en) * 1979-11-21 1981-05-14 Bm-Elektronik Meletzky Kg, 1000 Berlin Electroacoustic converter
DE3334442A1 (en) * 1983-09-23 1985-04-11 Telefunken Fernseh Und Rundfunk Gmbh, 3000 Hannover Loudspeaker
NO172469C (en) * 1984-01-25 1993-07-21 Per Kirksaeter SOUND REPLACEMENT SYSTEM
US4590333A (en) * 1984-06-14 1986-05-20 John Strohbeen Multidriver loudspeaker
DE8604597U1 (en) * 1986-02-20 1987-06-19 Erede, Marco, Lucca Dynamic loudspeaker for the reproduction of digital audio signals
DE68921924T3 (en) * 1988-06-02 2002-04-11 Boaz Elieli Electroacoustic transducer and loudspeaker.

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU210726U1 (en) * 2021-09-06 2022-04-28 Олег Григорьевич Лобанов LINEAR DYNAMIC SPEAKER

Also Published As

Publication number Publication date
JPH077793A (en) 1995-01-10
EP0604766A3 (en) 1995-01-25
DE4241212A1 (en) 1994-06-09
EP0604766A2 (en) 1994-07-06
DE59305497D1 (en) 1997-03-27

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