EP0687128B1 - Voice coil and method for production thereof - Google Patents

Voice coil and method for production thereof Download PDF

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Publication number
EP0687128B1
EP0687128B1 EP95107541A EP95107541A EP0687128B1 EP 0687128 B1 EP0687128 B1 EP 0687128B1 EP 95107541 A EP95107541 A EP 95107541A EP 95107541 A EP95107541 A EP 95107541A EP 0687128 B1 EP0687128 B1 EP 0687128B1
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EP
European Patent Office
Prior art keywords
coil
voice coil
voice
ultrasonic welding
wire
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EP95107541A
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German (de)
French (fr)
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EP0687128A1 (en
Inventor
Stefan Geisenberger
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Harman Audio Electronic Systems GmbH
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Harman Audio Electronic Systems GmbH
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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
    • H04R9/02—Details
    • H04R9/04—Construction, mounting, or centering of coil
    • H04R9/041—Centering

Definitions

  • the invention is concerned with the production of Voice coils for speakers, especially with the high temperature resistant connection of the individual Wire turns of the voice coil with each other or with a voice coil former.
  • voice coils from Speakers generally formed so that a metallic, mostly made of copper Coil wire first with an insulating layer and then is covered with a layer of baked lacquer before it Wire to form the voice coil around a carrier is wrapped.
  • a so-called voice coil former act who when he provided the voice coil is connected to the speaker diaphragm.
  • the carrier has only that Function of a mandrel, of which the Voice coil pulled after its manufacture and as such is connected to the speaker membrane.
  • Both versions have in common that if the Turns are wound around the corresponding carrier, these are subjected to a temperature process in order to a connection of the turns with each other and / or the Manufacture voice coil former.
  • This Temperature process can be designed so that first by means of a current surge through the Coil winding a pre-fixation is achieved and then to establish the final strength of the via the baked enamel the connection Voice coil is subjected to an annealing process. If the winding around the respective carrier Coil winding already has sufficient stability, can be carried out before the tempering process Pre-fixation by the surge is also eliminated.
  • the invention is based on the object Specify voice coil which is up to about 400 degrees Celsius is temperature stable, as well as a To specify manufacturing processes for voice coils, according to which high temperature resistant voice coils quickly and can be trained less energy-intensive.
  • Is according to claim 1 which also in the prior art known insulating layer of the voice coil wire a high temperature resistant polymer material and are the ones in contact with each other Areas of insulation layers of different Turns of the coil with each other ultrasonically welded, is a high temperature resistant Given the turns of the coil, without a further coating of the insulation of the Voice coil wire with baking varnish is necessary.
  • the insulation can too to connect the coil to the Voice coil former can be used without the Voice coil former has a special coating for Establishes the connection.
  • the voice coil former at least in the area with the turns the coil is also provided with a high temperature resistant polymer material coated, the voice coil wires with the Voice coil former using the Ultrasonic welding technology particularly strong and high temperature resistant (up to about 400 degrees Celsius) connect with each other.
  • a particularly good and high temperature resistant connection between voice coil wire and voice coil former is reached when at least the area of the Voice coil former, which with the Voice coil wire is wound with a high temperature resistant polymer material coated becomes.
  • a baked varnish coating can have even according to the prior art Voice coil former, which is used in baking lacquer technology Find use, a baked varnish coating can have.
  • FIG. 1 is a section through a Voice coil former 10 perpendicular to Paper plane extending speaker axis 11 shown.
  • This voice coil former is tubular and in the present case is made of aluminum.
  • the feasibility the invention neither on the use of a Voice coil former 10 still on the use of Aluminum as a material for the voice coil former 10 is limited.
  • the applicability of the Arrangements formed according to the invention do not Limited applications where temperatures of prevail over 150 degrees Celsius.
  • the voice coil wire 13 which in the present case is made of Copper is formed, has a diameter D of about 250 ⁇ m and has an insulating layer 15 encased.
  • the thickness d of this insulating layer 15 is about 50 ⁇ m.
  • This insulating layer is in the present case from a high temperature resistant Amide-imide polymer material formed. With this up about 400 degrees Celsius temperature resistant
  • the outer jacket 12 is also an amide-imide polymer material of the voice coil bobbin 10 coated. This with 16 designated insulation layer is only in the area the outer jacket 12 of the voice coil bobbin 10 which of the voice coil wires 13 or the coil 14 is covered, and has also a thickness of 50 ⁇ m.
  • Figure 1 which the voice coil former 10 in shows wrapped condition, makes it clear that after the voice coil wire 13 around the voice coil former 10 is wound, the insulating layers 15, 16 lie together. To a high temperature resistant and stable connection of up to this point only wound coil wires 13 with each other and with the To effect voice coil former 10, the Insulating layers 15, 16 with each other ultrasonically welded. To realize the Ultrasonic welding of an embodiment according to the figure 1 and to ensure adequate Insulation of the coil wires 13 after welding should the thickness d of the insulating layer 15 and the Insulating layer 16 is not below 20 microns.
  • the connection process of voice coil former 10 and wound coil 14 is closer in Figure 2 shown.
  • the tubular voice coil former 10 is in a bracket 17 is used.
  • This bracket encased the outer jacket 12 of the voice coil former 10 except for a narrow area 18.
  • the bracket 17 can with the voice coil bobbin 10th already during the winding of the coil wire 13 be connected.
  • the narrow one Area 18 for limiting the winding width B of the Coil 14 on the outer jacket 12 of the Voice coil former 10 can be used.
  • Can too during the winding of the coil wire 13 around the Outer jacket 12 is a mandrel (not in Figure 2 shown) the inner cross section of the Fill in the voice coil bobbin 10.
  • the one with the reference number 19 in FIG. 2 The electrode forms the so-called sonotrode Ultrasonic welding arrangement.
  • the insulating layers 15, 16 (FIG. 1) of voice coil former 10 and voice coil wire 13 by means of the electrode 19 and the Counter electrode 20 formed Ultrasonic welding arrangement with each other ultrasonically welded.
  • Ultrasonic welding arrangement can also be such are used in which the counter electrode 20 is not completely on the surface of the coil 14 is applied and the rotatable sonotrode 19 with velvet the voice coil bobbin 10 and the coil 14 for Welding the coil wires 13 together or with the voice coil bobbin 10 on the counter electrode 20 moved over.
  • the ultrasonic welding process is on an assembly Completed according to Figure 2, for example Front part 17.1 of the holder 17 in the direction of the arrow P3 removed and the with the voice coil bobbin 10th connected coil 14 in the direction of arrow P3 Arrangement can be taken after the segments of the Counter electrode 20 in the direction of arrow P2 from the Coil 14 have been lifted off.
  • Figure 3 is an arrangement for forming so-called voice coil carrier-free coils 14.1 shown. Under such coils 14.1 are understood where the the coil wires 13.1 forming coil wires 13 without the presence of a voice coil former 10 connected with each other and as such with the Speaker membrane (not shown) connected become.
  • connection of a strapless coil 14.1 the arrangement according to Figure 3 is such that those discussed in connection with Figure 1 Voice coil wires 13 around the outer jacket 21 of the Electrode 19 are wound.
  • the area of Electrode 19, which is coated with the coil 14.1 should be very smooth-walled and / or with a release agent to be coated to form a connection the insulation 15 with the outer jacket 21 of the electrode 19 to prevent during the welding process.
  • the electrode 19 are then the segments of the counter electrode 20 on the wound coil 14.1 lowered and the individual coil wires 13 on each other in Touching insulation 15 under the effect of Connected to ultrasonic welding technology strapless coil 14.1 in the direction of arrow P3 the electrode 19 are withdrawn after the Segments of the counter electrode 20 from the coil 14.1 were lifted off and the front part 17.1 of the Bracket 17 has been removed. Also in The embodiment according to FIG. 3 forms the electrode 19 the sonotrode of the ultrasonic welding arrangement.

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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)
  • Pressure Welding/Diffusion-Bonding (AREA)

Abstract

The moving coil assembly of a loudspeaker unit is produced with the windings formed on a tubular carrier (10) the axis of which forms that of the loudspeaker. The coil windings (14) are separated from each other by layers of insulation that are of a high temperature resistant polymer. The outer surface of the carrier tube also has a layer of insulation. The bonding of the curves of the coil with the carrier is produced by ultrasonic welding, with the assembly supported between electrodes (19, 20). <IMAGE>

Description

Technisches GebietTechnical field

Die Erfindung befaßt sich mit der Herstellung von Schwingspulen für Lautsprecher, insbesondere mit der hochtemperaturfesten Verbindung der einzelnen Drahtwindungen der Schwingspule miteinander bzw. mit einem schwingspulenträger.The invention is concerned with the production of Voice coils for speakers, especially with the high temperature resistant connection of the individual Wire turns of the voice coil with each other or with a voice coil former.

Eine solche Anordnung ist aus der US-A- 5 091 028 bekannt, welche auch die Merkmale des Oberbegriffs des Anspruchs 1 offenbart.Such an arrangement is known from US-A-5 091 028, which also the features of the preamble of claim 1 disclosed.

Stand der TechnikState of the art

Gemäß dem Stand der Technik werden Schwingspulen von Lautsprechern allgemein so gebildet, daß ein metallischer, zumeist aus Kupfer gebildeter Spulendraht zunächst mit einer Isolierschicht und dann mit einer Backlackschicht ummantelt wird, bevor dieser Draht zur Ausbildung der Schwingspule um einen Träger gewickelt wird. Je nach Ausbildung kann es sich bei dem Träger um einen sogenannten Schwingspulenträger handeln, der, wenn er mit der Schwingspule versehen ist, mit der Lautsprechermembran verbunden wird. Sofern die Ausbildung einer schwingspulenträgerfreien Schwingspule gewünscht ist, hat der Träger nur die Funktion eines Wickeldorns, von welchem die Schwingspule nach ihrer Herstellung abgezogen und als solche mit der Lautsprechermembran verbunden wird.According to the prior art, voice coils from Speakers generally formed so that a metallic, mostly made of copper Coil wire first with an insulating layer and then is covered with a layer of baked lacquer before it Wire to form the voice coil around a carrier is wrapped. Depending on the training it can be the carrier around a so-called voice coil former act who when he provided the voice coil is connected to the speaker diaphragm. Provided the formation of a voice coil bobbin-free Voice coil is desired, the carrier has only that Function of a mandrel, of which the Voice coil pulled after its manufacture and as such is connected to the speaker membrane.

Beiden Ausführungen ist gemein, daß, wenn die Windungen um den entsprechenden Träger gewickelt sind, diese einem Temperaturprozeß unterzogen werden, um eine Verbindung der Windungen miteinander und/oder dem Schwingspulenträger herzustellen. Dieser Temperaturprozeß kann so ausgestaltet sein, daß zunächst mittels eines Stromstoßes durch die Spulenwicklung eine Vorfixierung erreicht wird und dann zum Herstellen der endgültigen Festigkeit der über den Backlack hergestellten Verbindung die Schwingspule einem Temperprozeß unterzogen wird. Sofern die um den jeweiligen Träger gewundene Spulenwicklung schon eine genügende Stabilität besitzt, kann vor Ausführung des Temperprozesses die Vorfixierung durch den Stromstoß auch entfallen.Both versions have in common that if the Turns are wound around the corresponding carrier, these are subjected to a temperature process in order to a connection of the turns with each other and / or the Manufacture voice coil former. This Temperature process can be designed so that first by means of a current surge through the Coil winding a pre-fixation is achieved and then to establish the final strength of the via the baked enamel the connection Voice coil is subjected to an annealing process. If the winding around the respective carrier Coil winding already has sufficient stability, can be carried out before the tempering process Pre-fixation by the surge is also eliminated.

Bei dieser Verfahrensführung wird aber als nachteilig empfunden, daß der Temperprozeß relativ lange, d. h. etwa eine Stunde dauert. Ferner wird als nachteilig erachtet, daß derart ausgebildete Schwingspulen unter mechanischer Beanspruchung nur bis etwa 150 Grad Celsius temperaturstabil sind. Werden Backspulen oberhalb des genannten Temperaturbereichs betrieben, kann dies zu einem Ablösen der Spulendrähte führen. Da aber Lautsprecher und somit auch Schwingspulen in neueren Anwendungen bei weit höheren Temperaturen arbeiten sollen, sind derartig ausgebildete (Backlack-) Schwingspulen nicht mehr einsetztbar.This procedure is considered disadvantageous felt that the annealing process for a relatively long time, i. H. takes about an hour. It is also considered disadvantageous considers that such trained voice coils under mechanical stress only up to about 150 degrees Celsius are temperature stable. Become baking coils operated above the specified temperature range, this can cause the coil wires to come off. There but speakers and thus voice coils in newer applications at far higher temperatures are supposed to work in this way (Backlack) voice coils can no longer be used.

Daher liegt der Erfindung die Aufgabe zu Grunde, eine Schwingspule anzugeben, welche bis etwa 400 Grad Celsius temperaturstabil ist, sowie ein Herstellverfahren für Schwingspulen anzugeben, nach welchem hochtemperaturfeste Schwingspulen schnell und weniger energieintensiv ausgebildet werden können.Therefore, the invention is based on the object Specify voice coil which is up to about 400 degrees Celsius is temperature stable, as well as a To specify manufacturing processes for voice coils, according to which high temperature resistant voice coils quickly and can be trained less energy-intensive.

Darstellung der ErfindungPresentation of the invention

Diese Aufgabe wird in vorrichtungsmäßiger Hinsicht durch die Merkmale von Anspruch 1 und in verfahrensmäßiger Hinsicht durch die Merkmale gemäß Anspruch 5 gelöst. Vorteilhafte Aus- und Weiterbildungen der Erfindung sind den Ansprüchen 2 bis 4 bzw. 6 bis 8 entnehmbar.This task is done in terms of device by the features of claim 1 and in procedurally due to the features according to Claim 5 solved. Advantageous training and Further developments of the invention are claims 2 up to 4 or 6 to 8 removable.

Wird gemäß Anspruch 1 die auch beim Stand der Technik bekannte Isolierschicht des Schwingspulendrahtes aus einem hochtemperaturfesten Polymer-Material gebildet und sind die miteinander in Berührung stehenden Bereiche der Isolierschichten der verschiedenen Windungen der Spule miteinander ultraschallverschweißt, ist eine hochtemperaturfeste Verbindung der Windungen der Spule gegeben, ohne daß eine weitere Beschichtung der Isolierung des Schwingspulendrahtes mit Backlack notwendig ist.Is according to claim 1 which also in the prior art known insulating layer of the voice coil wire a high temperature resistant polymer material and are the ones in contact with each other Areas of insulation layers of different Turns of the coil with each other ultrasonically welded, is a high temperature resistant Given the turns of the coil, without a further coating of the insulation of the Voice coil wire with baking varnish is necessary.

Ist der Spulendraht mit der in Anspruch 1 angegeben Isolierung beschichtet und gemäß Anspruch 2 um einen Schwingspulenträger gewunden, kann die Isolierung auch zur Verbindung der Spule mit dem Schwingspulenträger genutzt werden, ohne daß der Schwingspulenträger eine besondere Beschichtung zur Herstellung der Verbindung aufweist.Is the coil wire with that specified in claim 1 Insulation coated and according to claim 2 around Coiled voice coil former, the insulation can too to connect the coil to the Voice coil former can be used without the Voice coil former has a special coating for Establishes the connection.

Ist gemäß Anspruch 3 auch der Schwingspulenträger zumindest in dem Bereich, welcher mit den Windungen der Spule versehen wird, ebenfalls mit einem hochtemperaturfesten Polymer-Material beschichtet, lassen sich die Schwingspulendrähte mit dem Schwingspulenträger unter Anwendung der Ultraschallschweißtechnik besonders fest und hochtemperaturfest (bis etwa 400 Grad Celsius) miteinander verbinden.According to claim 3 is also the voice coil former at least in the area with the turns the coil is also provided with a high temperature resistant polymer material coated, the voice coil wires with the Voice coil former using the Ultrasonic welding technology particularly strong and high temperature resistant (up to about 400 degrees Celsius) connect with each other.

Besonders gute Ergebnisse werden erzielt, wenn - wie in Anspruch 4 angegeben - die Beschichtung von Schwingspulendraht und/oder Schwingspulenträgern aus einem Amid-Imid-Polymer-Material gebildet wird. Particularly good results are achieved if - how specified in claim 4 - the coating of Voice coil wire and / or voice coil formers an amide-imide polymer material is formed.

Die in Anspruch 5 angegebene Schrittfolge zur Herstellung einer Schwingspule zeigt deutlich, daß die nach dem Stand der Technik erforderliche Beschichtung der Isolierung des Schwingspulendrahtes mit Backlack entfallen kann. Da außerdem die Verbindung der Schwingspulendrähte miteinander durch Anwendung der Ultraschallschweißtechnik erfolgt, entfällt ein sonst erforderlicher und langwieriger Temperprozeß.The sequence of steps specified in claim 5 Manufacture of a voice coil clearly shows that the coating required according to the prior art the insulation of the voice coil wire with baking lacquer can be omitted. Since also the connection of the Voice coil wires to each other by using the Ultrasonic welding technology takes place, an otherwise omitted required and lengthy annealing process.

Die Verfahrensführung ist weiter vereinfacht, wenn gemäß Anspruch 6 entweder die Gegenelektrode oder die Sonotrode der Ultraschallschweißanordnung den Wickeldorn zur Ausbildung der Schwingspule bildet.The procedure is further simplified if according to claim 6 either the counter electrode or the Sonotrode of the ultrasonic welding arrangement Forms mandrel to form the voice coil.

Sollen Schwingspulen ausgebildet werden, die einen Schwingspulenträger aufweisen, ist es notwendig auf den Wickeldorn einen Schwingspulenträger aufzuschieben, bevor die Wicklung ausgeführt wird.Should voice coils be formed that one Have voice coil former, it is necessary the voice mandrel a voice coil former to be delayed before the winding is carried out.

Eine besonders gute und hochtemperaturfeste Verbindung zwischen Schwingspulendraht und Schwingspulenträger ist dann erreicht, wenn zumindest der Bereich des Schwingspulenträgers, welcher mit dem Schwingspulendraht bewickelt wird, mit einem hochtemperaturfesten Polymer-Material beschichtet wird. In diesem Zusammenhang sei darauf hingewiesen, daß auch nach dem Stand der Technik die Schwingspulenträger, welche bei der Backlacktechnik Verwendung finden, eine Backlackbeschichtung aufweisen können.A particularly good and high temperature resistant connection between voice coil wire and voice coil former is reached when at least the area of the Voice coil former, which with the Voice coil wire is wound with a high temperature resistant polymer material coated becomes. In this context, it should be noted that even according to the prior art Voice coil former, which is used in baking lacquer technology Find use, a baked varnish coating can have.

Kurze Darstellung der FigurenBrief presentation of the figures

Es zeigen:

Figur 1
einen Schnitt durch einen Schwingspulenträger;
Figur 2
einen Schnitt durch eine Verschweißanordnung; und
Figur 3
eine weitere Darstellung gemäß Figur 2.
Show it:
Figure 1
a section through a voice coil former;
Figure 2
a section through a welding assembly; and
Figure 3
another representation according to FIG. 2.

Wege zum Ausführen der ErfindungWays of Carrying Out the Invention

Die Erfindung soll nun anhand der Figuren näher erläutert werden.The invention will now be described with reference to the figures are explained.

Mit Figur 1 ist ein Schnitt durch einen Schwingspulenträger 10 quer zur senkrecht zur Papierebene verlaufenden Lautsprecherachse 11 gezeigt. Dieser Schwingspulenträger ist rohrförmig ausgebildet und besteht vorliegend aus Aluminium. Schon an dieser Stelle sei darauf hingewiesen, daß die Ausführbarkeit der Erfindung weder auf die Verwendung eines Schwingspulenträgers 10 noch auf die Verwendung von Aluminium als Werkstoff für den Schwingspulenträger 10 beschränkt ist. Auch ist die Anwendbarkeit der erfindungsgemäß gebildeten Anordnungen nicht auf Anwendungen beschränkt, bei denen Temperaturen von über 150 Grad Celsius vorherrschend sind.With Figure 1 is a section through a Voice coil former 10 perpendicular to Paper plane extending speaker axis 11 shown. This voice coil former is tubular and in the present case is made of aluminum. Already at this It should be noted that the feasibility the invention neither on the use of a Voice coil former 10 still on the use of Aluminum as a material for the voice coil former 10 is limited. The applicability of the Arrangements formed according to the invention do not Limited applications where temperatures of prevail over 150 degrees Celsius.

Um den Außenmantel 12 des Schwingspulenträgers 10 ist der Schwingspulendraht 13 gewickelt, welcher die Spule 14 (in Figur 1 nicht dargestellt) des Lautsprechers bildet. Deutlich ist dem in Figur 1 gezeigten Ausführungsbeispiel entnehmbar, daß der Schwingspulendraht 13 in zwei Lagen um den Außenmantel 12 des Schwingspulenträgers 10 gewickelt ist.Around the outer jacket 12 of the voice coil bobbin 10 the voice coil wire 13 wound, which the Coil 14 (not shown in Figure 1) of Speaker forms. This is clear in Figure 1 Embodiment shown that the Voice coil wire 13 in two layers around the outer jacket 12 of the voice coil bobbin 10 is wound.

Der Schwingspulendraht 13, welcher vorliegend aus Kupfer gebildet ist, weist einen Durchmesser D von etwa 250 µm auf und ist mit einer Isolierschicht 15 ummantelt. Die Dicke d dieser Isolierschicht 15 beträgt etwa 50 µm. Diese Isolierschicht ist vorliegend aus einem hochtemperaturfesten Amid-Imid-Polymer-Material gebildet. Mit diesem bis etwa 400 Grad Celsius temperaturfestem Amid-Imid-Polymer-Material ist auch der Außenmantel 12 des Schwingspulenträgers 10 beschichtet. Diese mit 16 bezeichnete Isolierschicht ist nur in dem Bereich auf dem Außenmantel 12 des Schwingspulenträgers 10 ausgebildet, welcher von den Schwingspulendrähten 13 bzw. der Spule 14 ummantelt ist, und hat ebenfalls eine Dicke von 50 µm.The voice coil wire 13, which in the present case is made of Copper is formed, has a diameter D of about 250 µm and has an insulating layer 15 encased. The thickness d of this insulating layer 15 is about 50 µm. This insulating layer is in the present case from a high temperature resistant Amide-imide polymer material formed. With this up about 400 degrees Celsius temperature resistant The outer jacket 12 is also an amide-imide polymer material of the voice coil bobbin 10 coated. This with 16 designated insulation layer is only in the area the outer jacket 12 of the voice coil bobbin 10 which of the voice coil wires 13 or the coil 14 is covered, and has also a thickness of 50 µm.

Figur 1, welche den Schwingspulenträger 10 im bewickelten Zustand zeigt, macht deutlich, daß nachdem der Schwingspulendraht 13 um den Schwingspulenträger 10 gewickelt ist, die Isolierschichten 15, 16 aneinander liegen. Um eine hochtemperaturfeste und stabile Verbindung der bis zu diesem Zeitpunkt nur gewickelten Spulendrähte 13 miteinander und mit dem Schwingspulenträger 10 zu bewirken, werden die Isolierschichten 15, 16 miteinander ultraschallverschweißt. Zur Realisierung der Ultraschallverschweißung einer Ausführung gemäß Figur 1 und zur Sicherstellung einer ausreichenden Isolierung der Spulendrähte 13 nach dem Verschweißen sollte die Dicke d der Isolierschicht 15 und der Isolierschicht 16 nicht unterhalb von 20 µm liegen.Figure 1, which the voice coil former 10 in shows wrapped condition, makes it clear that after the voice coil wire 13 around the voice coil former 10 is wound, the insulating layers 15, 16 lie together. To a high temperature resistant and stable connection of up to this point only wound coil wires 13 with each other and with the To effect voice coil former 10, the Insulating layers 15, 16 with each other ultrasonically welded. To realize the Ultrasonic welding of an embodiment according to the figure 1 and to ensure adequate Insulation of the coil wires 13 after welding should the thickness d of the insulating layer 15 and the Insulating layer 16 is not below 20 microns.

Der Verbindungsvorgang von Schwingspulenträger 10 und gewickelter Spule 14 ist in Figur 2 näher gezeigt. Der rohrförmige Schwingspulenträger 10 ist in eine Halterung 17 eingesetzt. Diese Halterung ummantelt den Außenmantel 12 des Schwingspulenträgers 10 bis auf einen schmalen Bereich 18. Dieser Bereich 18, welcher den Außenmantel 12 des Schwingspulenträgers 10 nicht abdeckt, ist mit den die Spule 14 bildenden Spulendrähten 13 bewickelt. Die Halterung 17 kann mit dem Schwingspulenträger 10 schon während des Wickelns des Spulendrahtes 13 verbunden sein. In diesem Fall kann der schmale Bereich 18 zur Begrenzung der Wickelbreite B der Spule 14 auf dem Außenmantel 12 des Schwingspulenträgers 10 genutzt werden. Auch kann während des Wickelns des Spulendrahtes 13 um den Außenmantel 12 ein Wickeldorn (in Figur 2 nicht dargestellt) den Innenquerschnitt des Schwingspulenträgers 10 ausfüllen.The connection process of voice coil former 10 and wound coil 14 is closer in Figure 2 shown. The tubular voice coil former 10 is in a bracket 17 is used. This bracket encased the outer jacket 12 of the voice coil former 10 except for a narrow area 18. This area 18, which the outer jacket 12 of the Voice coil carrier 10 does not cover, with the Coil 14 forming coil wires 13 wound. The bracket 17 can with the voice coil bobbin 10th already during the winding of the coil wire 13 be connected. In this case, the narrow one Area 18 for limiting the winding width B of the Coil 14 on the outer jacket 12 of the Voice coil former 10 can be used. Can too during the winding of the coil wire 13 around the Outer jacket 12 is a mandrel (not in Figure 2 shown) the inner cross section of the Fill in the voice coil bobbin 10.

Ist der Schwingspulenträger 10 mit dem Spulendraht 13 bewickelt, wird zunächst der Wickeldorn (sofern er vorhanden ist) entfernt und durch eine - ebenfalls im Innenquerschnitt des Schwingspulenträgers 10 ausfüllende - Elektrode 19 der Ultraschallschweißanordnung ersetzt und in Pfeilrichtung P1 bis zu der Position vorgeschoben, die durch die gestrichelte Linie angedeutet ist. Es ist offensichtlich, daß auf die Verwendung eines eigenständigen Wickeldorns dann verzichtet werden kann, wenn die Elektrode 19 schon während des Wickelns des Spulendrahtes 13 in dem Innenquerschnitt des Schwingspulenträgers 10 eingeschoben ist. In diesem Fall übernimmt die Elektrode 19 die Funktion des Wickeldorns.Is the voice coil bobbin 10 with the coil wire 13 the winding mandrel (if it is is present) and removed by - also in Internal cross section of the voice coil bobbin 10 filling - electrode 19 of the Ultrasonic welding assembly replaced and in Arrow direction P1 advanced to the position that is indicated by the dashed line. It is obvious that on the use of a independent winding mandrel can then be dispensed with can, if the electrode 19 already during winding of the coil wire 13 in the inner cross section of the Voice coil former 10 is inserted. In this In this case, the electrode 19 takes on the function of Mandrel.

Die in Figur 2 mit dem Bezugszeichen 19 versehene Elektrode bildet die sogenannte Sonotrode der Ultraschallschweißanordnung.The one with the reference number 19 in FIG. 2 The electrode forms the so-called sonotrode Ultrasonic welding arrangement.

Desweiteren wird eine entlang der Pfeilrichtung P2 bewegliche Gegenelektrode 20 der Ultraschallschweißanordnung auf die gewickelte Spule 14 abgesenkt. Die mit der Spule 14 in Berührung stehenden Bereiche der vorliegend aus zwei halbrohrförmigen Segmenten gebildeten Gegenelektrode 20 üben dabei einen leichten Druck auf die gewickelte Spule 14 aus.Furthermore, along the arrow direction P2 movable counter electrode 20 of the Ultrasonic welding assembly on the wound Coil 14 lowered. The one with the coil 14 areas in contact with the present two semi-tubular segments formed Counterelectrode 20 exert slight pressure the wound coil 14 from.

Sodann werden die Isolierschichten 15, 16 (Figur 1) von Schwingspulenträger 10 und Schwingspulendraht 13 mittels der aus der Elektrode 19 und der Gegenelektrode 20 gebildeten Ultraschallschweißanordnung miteinander ultraschallverschweißt.Then the insulating layers 15, 16 (FIG. 1) of voice coil former 10 and voice coil wire 13 by means of the electrode 19 and the Counter electrode 20 formed Ultrasonic welding arrangement with each other ultrasonically welded.

Abweichend zu der in Figur 2 gezeigten Ultraschallschweißanordnung kann auch eine solche verwendet werden, bei der die Gegenelektrode 20 nicht vollständig an der Oberfläche der Spule 14 anliegt und sich die drehbare Sonotrode 19 mit samt dem Schwingspulenträger 10 und der Spule 14 zur Verschweißung der Spulendrähte 13 miteinander bzw. mit dem Schwingspulenträger 10 an der Gegenelektrode 20 vorbei bewegt.Deviating from that shown in Figure 2 Ultrasonic welding arrangement can also be such are used in which the counter electrode 20 is not completely on the surface of the coil 14 is applied and the rotatable sonotrode 19 with velvet the voice coil bobbin 10 and the coil 14 for Welding the coil wires 13 together or with the voice coil bobbin 10 on the counter electrode 20 moved over.

Ist der Ultraschallschweißprozeß auf einer Anordnung gemäß Figur 2 abgeschlossen, kann beispielsweise das Vorderteil 17.1 der Halterung 17 in Pfeilrichtung P3 abgenommen und die mit dem Schwingspulenträger 10 verbundene Spule 14 in Pfeilrichtung P3 der Anordnung entnommen werden, nachdem die Segmente der Gegenelektrode 20 in Pfeilrichtung P2 von der Spule 14 abgehoben wurden.The ultrasonic welding process is on an assembly Completed according to Figure 2, for example Front part 17.1 of the holder 17 in the direction of the arrow P3 removed and the with the voice coil bobbin 10th connected coil 14 in the direction of arrow P3 Arrangement can be taken after the segments of the Counter electrode 20 in the direction of arrow P2 from the Coil 14 have been lifted off.

Wenngleich sich das in Zusammenhang mit Figur 2 gezeigte Verfahren auf die Ausbildung einer Spule 14 gemäß Figur 1 bezieht, läßt sich dieses Verfahren auch zur Ausbildung einer Träger-Spulen-Kombination anwenden, bei der der Schwingspulenträger 10 selbst keine eigenständige Isolierschicht 16 aufweist. Um in diesem Fall eine gute Haftung der Isolierung 15 des Spulendrahtes 13 auf dem Außenmantel 12 des Schwingspulenträgers zu erzielen, sollte der Bereich des Außenmantels 12, welcher mit der Spule 14 belegt wird, aufgeraut sein. Weist der Schwingspulenträger 10 selbst keine zusätzliche Beschichtung auf, d.h. wird der isolierte Spulendraht 13 direkt um den Außenmantel 12 des Schwingspulenträgers 10 gewunden, sollte die Dicke d der Isolierschicht 15 mindestens 20 µm betragen.Although this is in connection with Figure 2 shown methods on the formation of a 1 relates to coil 14, can be this procedure also for training a Use carrier-coil combination in which the Voice coil 10 itself no independent Has insulating layer 16. To in this case good adhesion of the insulation 15 of the coil wire 13 on the outer jacket 12 of the voice coil former the area of the outer jacket 12, which is occupied by the coil 14, roughened his. If the voice coil former 10 itself does not have one additional coating, i.e. becomes the isolated Coil wire 13 directly around the outer jacket 12 of the Voice coil former 10 wound, the thickness d the insulating layer 15 be at least 20 microns.

In Figur 3 ist eine Anordnung zum Ausbilden von sogenannten schwingspulenträgerfreien Spulen 14.1 gezeigt. Unter derartigen Spulen 14.1 werden solche verstanden, bei denen die die Spule 14.1 bildenden Spulendrähte 13 ohne die Anwesenheit eines Schwingspulenträgers 10 miteinander verbunden und als solche mit der Lautsprechermembran (nicht dargestellt) verbunden werden.In Figure 3 is an arrangement for forming so-called voice coil carrier-free coils 14.1 shown. Under such coils 14.1 are understood where the the coil wires 13.1 forming coil wires 13 without the presence of a voice coil former 10 connected with each other and as such with the Speaker membrane (not shown) connected become.

Die Ausbildung derartiger Spulen 14.1 macht immer einen Wickeldorn erforderlich, um dessen Außenmantel die Schwingspulendrähte 13 gewickelt werden. Vorliegend wird die Funktion des Wickeldorns von der Elektrode 19 der Ultraschallschweißanordnung gebildet. Um die Wickelbreite B der trägerlosen Spule 14.1 während des Wickelns zu begrenzen bzw. um eine Ausweitung der Wickelbreite B der gewünschten Spule 14.1 unter dem Druck der auf sie abgesenkten Segmente der Gegenelektrode 20 vorzubeugen, kann die Elektrode 19 von einer Halterung 17 umgeben sein. Letzteres ist durch die gestrichelte Umrandung angedeutet.The formation of such coils 14.1 always required a winding mandrel to its Outer sheath the voice coil wires 13 wound become. The function of the winding mandrel is present from the electrode 19 of the ultrasonic welding arrangement educated. Around the winding width B of the strapless Limit coil 14.1 during winding or by an expansion of the winding width B of the desired coil 14.1 under the pressure of lowered segments of the counter electrode 20 to prevent the electrode 19 from a bracket 17 be surrounded. The latter is indicated by the dashed line Outline indicated.

Die Verbindung einer trägerlosen Spule 14.1 auf der Anordnung gemäß Figur 3 erfolgt dergestalt, daß die in Zusammenhang mit Figur 1 erörterten Schwingspulendrähte 13 um den Außenmantel 21 der Elektrode 19 gewickelt werden. Der Bereich der Elektrode 19, welcher mit der Spule 14.1 belegt wird, sollte sehr glattwandig ausgebildet und/oder mit einem Trennmittel beschichtet sein, um eine Verbindung der Isolierung 15 mit dem Außenmantel 21 der Elektrode 19 während des Schweißprozesses zu verhindern. Sind sodann die Segmente der Gegenelektrode 20 auf die gewickelte Spule 14.1 abgesenkt und die einzelnen Spulendrähte 13 an ihren miteinander in Berührung stehenden Isolierungen 15 unter Wirkung der Ultraschallschweißtechnik verbunden, kann die trägerlose Spule 14.1 in Pfeilrichtung P3 von der Elektrode 19 abgezogen werden, nachdem zuvor die Segmente der Gegenelektrode 20 von der Spule 14.1 abgehoben wurden und das Vorderteil 17.1 der Halterung 17 entfernt wurde. Auch im Ausführungsbeispiel gemäß Figur 3 bildet die Elektrode 19 die Sonotrode der Ultraschallschweißanordnung.The connection of a strapless coil 14.1 the arrangement according to Figure 3 is such that those discussed in connection with Figure 1 Voice coil wires 13 around the outer jacket 21 of the Electrode 19 are wound. The area of Electrode 19, which is coated with the coil 14.1 should be very smooth-walled and / or with a release agent to be coated to form a connection the insulation 15 with the outer jacket 21 of the electrode 19 to prevent during the welding process. are then the segments of the counter electrode 20 on the wound coil 14.1 lowered and the individual coil wires 13 on each other in Touching insulation 15 under the effect of Connected to ultrasonic welding technology strapless coil 14.1 in the direction of arrow P3 the electrode 19 are withdrawn after the Segments of the counter electrode 20 from the coil 14.1 were lifted off and the front part 17.1 of the Bracket 17 has been removed. Also in The embodiment according to FIG. 3 forms the electrode 19 the sonotrode of the ultrasonic welding arrangement.

Claims (8)

  1. A voice coil for loudspeakers,
    having a metallic wire (13), which is surrounded by an insulating later (15) and whose windings forming the coil (14) are connected to one another,
    characterised in that the insulating layer (15) is formed from a high-temperature resistant polymer material,
    and in that the windings forming the coil (14) are connected by ultrasonic welding of the insulating layers (15) at their regions of the insulating layer (15) touching one another.
  2. A voice coil according to Claim 1,
    characterised in that the coil (14) is wound around a tubular voice coil support (10)
    and in that the insulating layers (15) of the coil wires (13) after ultrasonic welding simultaneously also connect the coil wires (13) with the voice coil support (10).
  3. A voice coil according to Claim 2,
    characterised in that the voice coil support (10) is provided with an insulating layer (16) made from a high-temperature resistant polymer material at least in the region around which the coil (14) is wound.
  4. A voice coil according to Claim 1 or Claim 3,
    characterised in that the insulating layer (15; 16) is formed by voice coil wire (13) and/or voice coil support (10) of an amide-imide polymer material.
  5. A process for the manufacture of voice coils,
       characterised by the following steps - given in chronological order:
    1st step: coating the metallic coil wire (13) with an insulating layer (15) made of a high temperature resistant polymer material;
    2nd step: winding the coated coil wire (13) around a winding spindle to produce a coil (14);
    3rd step: placing sonotrode (19) and counter-electrode (20) of an ultrasonic welding arrangement in the region of the winding spindle in which the coil (14) has been wound, whereby the coil (14) is disposed between the electrodes (19, 20);
    4th step: ultrasonic welding of the insulating layers (15) of the coil wire (13) to one another; and
    5th step: pulling the coil wires (13) welded together from the winding spindle.
  6. A process according to Claim 5,
    characterised in that the winding spindle is formed by the sonotrode (19) or the counter-electrode (20) of the ultrasonic welding arrangement.
  7. A process according to Claim 5 or Claim 6,
    characterised in that a voice coil support (10) is pushed onto the winding spindle before the second step,
    in that the insulating layer (15) of the coil wires (13) are connected to one another and to the voice coil support (10) by the ultrasonic welding according to step four,
    and in that the voice coil support (10) is pulled from the winding spindle in the state connected with the coil (14).
  8. A process according to Claim 7,
    characterised in that before winding the voice coil support (10) is coated with a high-temperature resistant polymer material at least in the region which is wound with the coil wire (13).
EP95107541A 1994-06-01 1995-05-18 Voice coil and method for production thereof Expired - Lifetime EP0687128B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4419252A DE4419252A1 (en) 1994-06-01 1994-06-01 Voice coil and method of making it
DE4419252 1994-06-01

Publications (2)

Publication Number Publication Date
EP0687128A1 EP0687128A1 (en) 1995-12-13
EP0687128B1 true EP0687128B1 (en) 2000-04-19

Family

ID=6519589

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95107541A Expired - Lifetime EP0687128B1 (en) 1994-06-01 1995-05-18 Voice coil and method for production thereof

Country Status (4)

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EP (1) EP0687128B1 (en)
JP (1) JPH0847088A (en)
AT (1) ATE192010T1 (en)
DE (2) DE4419252A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT404206B (en) * 1996-11-20 1998-09-25 Harman Int Ind METHOD FOR PRODUCING COILS

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3963882A (en) * 1975-03-14 1976-06-15 Control Data Corporation Boron or graphite reinforced voice coil and manufacturing process
US4048713A (en) * 1975-06-09 1977-09-20 Mogens Hvass Method of making compact electric coils
DE3247941A1 (en) * 1982-12-24 1984-06-28 Standard Elektrik Lorenz Ag, 7000 Stuttgart SPEAKER
JPS61226000A (en) * 1985-03-30 1986-10-07 Totoku Electric Co Ltd Manufacture of extremely heat resistant voice coil
US4825533A (en) * 1985-10-11 1989-05-02 Pioneer Electronic Corporation Method of making a voice coil with rectangular coil wire and foil leads
DE3635152A1 (en) * 1986-10-15 1988-04-21 Hoegl Helmut ELECTROMAGNETIC ARRANGEMENT, ESPECIALLY ELECTROMAGNETIC WINDING
JPH02283200A (en) * 1989-04-25 1990-11-20 Matsushita Electric Ind Co Ltd Manufacture of voice coil for speaker

Also Published As

Publication number Publication date
ATE192010T1 (en) 2000-05-15
DE4419252A1 (en) 1995-12-07
EP0687128A1 (en) 1995-12-13
JPH0847088A (en) 1996-02-16
DE59508182D1 (en) 2000-05-25

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