EP1077014B1 - FLAT ACOUSTIC PANEL with driver - Google Patents

FLAT ACOUSTIC PANEL with driver Download PDF

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Publication number
EP1077014B1
EP1077014B1 EP99923592A EP99923592A EP1077014B1 EP 1077014 B1 EP1077014 B1 EP 1077014B1 EP 99923592 A EP99923592 A EP 99923592A EP 99923592 A EP99923592 A EP 99923592A EP 1077014 B1 EP1077014 B1 EP 1077014B1
Authority
EP
European Patent Office
Prior art keywords
voice coil
driver
acoustic panel
moving coil
coil bobbin
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP99923592A
Other languages
German (de)
French (fr)
Other versions
EP1077014A1 (en
Inventor
Wolfgang Bachmann
Gerhard Krump
Hans-Jürgen Regl
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Harman Becker Automotive Systems GmbH
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Harman Becker Automotive Systems GmbH
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Publication date
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Publication of EP1077014A1 publication Critical patent/EP1077014A1/en
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Classifications

    • 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
    • H04R9/066—Loudspeakers using the principle of inertia
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R17/00—Piezoelectric transducers; Electrostrictive transducers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R7/00—Diaphragms for electromechanical transducers; Cones
    • H04R7/02—Diaphragms for electromechanical transducers; Cones characterised by the construction
    • H04R7/04—Plane diaphragms
    • H04R7/06—Plane diaphragms comprising a plurality of sections or layers
    • H04R7/10—Plane diaphragms comprising a plurality of sections or layers comprising superposed layers in contact
    • 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
    • H04R9/045—Mounting
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R31/00—Apparatus or processes specially adapted for the manufacture of transducers or diaphragms therefor
    • H04R31/006—Interconnection of transducer parts
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R7/00—Diaphragms for electromechanical transducers; Cones
    • H04R7/02—Diaphragms for electromechanical transducers; Cones characterised by the construction
    • H04R7/04—Plane diaphragms
    • H04R7/045—Plane diaphragms using the distributed mode principle, i.e. whereby the acoustic radiation is emanated from uniformly distributed free bending wave vibration induced in a stiff panel and not from pistonic motion

Definitions

  • the invention is concerned with the formation of drivers for flat. Sound panels, especially with the formation of drivers, which can be used as a prefabricated component in a variety of sound panels.
  • electrodynamic drivers To generate bending waves in the respective sound panel, this is excited by one or more electrodynamic drivers (shakers). Sound panels are also known, which are driven exclusively or combined with the above-mentioned electrodynamic drivers of piezoelectric bending oscillator discs. However, the subject of this application are only the electrodynamic drivers.
  • a driver for a flat sound panel which has a voice coil bobbin on which a voice coil is mounted, and at least one permanent magnet, a yoke assembly and an air gap in which the voice coil bobbin dives with the voice coil, the voice coil bobbin with the permanent magnet and / or the yoke assembly is connected by means of an elastic membrane.
  • These drivers are essentially formed by a voice coil provided with a voice coil former, at least one permanent magnet and a scrubschussußan extract; wherein the voice coil dives into an existing air gap by the mutual arrangement of the various components.
  • the yoke assembly also includes such arrangements that merely direct or direct the magnetic field lines.
  • the air gap in the sense of this application is not to be understood merely as a gap between components into which the voice coil former or the voice coil is immersed.
  • the combination between sound panel and electrodynamic drivers is solved by placing the drivers on one side of the sound panel or integrating them into it. If the drivers are attached to one side of the sound panel, it is possible to resort to driver principles that are also used to drive cone speakers. In detail, this is realized so that the unit formed from the yoke assembly and the respective permanent magnet is connected by means of brackets with the Klangpaneel.
  • the voice coil which acts on the Klangpaneel and is also connected for this purpose with this, can be centered in this embodiment on the known from the cone speakers ago Zentriermembranen.
  • the centering diaphragm which is connected to the voice coil bobbin, attached to the holder.
  • the invention has for its object to provide a driver for a sound panel, which are pre-produced for a variety of applications and can be integrated without further centering in Klangpaneel.
  • a driver is created, which can be integrated without further centering in a sound panel.
  • the voice coil support pot-shaped and connected according to claim 3 its bottom to the Klangpaneel, in contrast to the usual ring-shaped voice coil carriers, a relatively large-scale excitation of the sound panel caused.
  • the floor itself or a plate arranged between the floor and the sound panel has a diameter which is smaller than or equal to the diameter of the clamping coil support.
  • the base itself or the plate is designed as a piezoelectric bending wave scanner, because in this case its contacting is simplified by the close spatial connection of two drivers. In this case, however, to avoid a mutual. Influencing driver and piezoelectric bending wave oscillator, the piezoelectric bending wave oscillator with the voice coil carrier of the driver to be decoupled connected.
  • Fig. 1 shows a sound panel 11, which consists of a core layer 11 'formed of rigid foam and two cover layers 11 "connected to the core layer 11' Further, Fig. 1 shows an electromagnetic driver 12, which in a cutout in Klangpaneel 11 is used.
  • This driver 12 is essentially formed by a pot-shaped yoke assembly 14, a permanent magnet 15 and a voice coil 17 provided with a voice coil 17.
  • the permanent magnet is inserted and connected in the cup-shaped return yoke assembly. Since the diameter of the permanent magnet 15 is smaller than the inner diameter of the cup-shaped yoke assembly 14, there is a mutual radial distance between these parts (14, 15), which is referred to as air gap 18 in the context of this application.
  • the voice coil bobbin 17 which is likewise pot-shaped, is inserted into the air gap 18 at its edge 17 'provided with the voice coil 16.
  • the bottom 17 “of the voice coil bobbin 17 is under Intermediate arrangement of a plate 19 connected to the bottom 20 of the cutout 13.
  • a separate plate 19 is not necessary if the plate 19 is replaced by a corresponding design of the bottom 17 "of the voice coil bobbin 17 and / or the bottom 20 of the cutout 13.
  • the plate 19 has a smaller diameter compared to the voice coil former 17.
  • This reduction in diameter causes an improved impression of bending waves in the Klangpaneel 11, because on the one hand, the force is concentrated on a small area and, moreover, this also for the production of.
  • the remote from the permanent magnet 15 bottom of the yoke assembly is provided with an anchor plate 21 and connected via this with the Klangpaneel 11.
  • the edge 14 'of the yoke assembly 14 is provided with a ring 22 which surrounds the edge Extended 14 'in the direction of the plate 19.
  • a Zentriermembranen 23 is present, which extends in the air gap 18 between the ring 22 and the edge 17 'of the voice coil bobbin 17.
  • the plate 19 is designed as a piezoelectric bending wave disk, advantages arise with respect to the contacting when the plate 19 designed as a bending wave disk is already in the factory, ie before its connection to the bottom 20 was already connected to the voice coil bobbin 17.
  • the centering diaphragm 23 and / or the bottom 17 "of the voice coil bobbin 17 breakthroughs (not shown), through which spacers (not shown) can be inserted during assembly of the driver 12 shown in Fig. 1. If openings in the centering membrane 23 and / or the bottom 17 "are to be dispensed with, the required centering can be achieved also means of a centric guided by the permanent magnet 15 and the yoke assembly 17 pin (not shown), which depending on the design and only in the core layer 11 'can end.
  • Fig. 2 differs from the embodiment of FIG. 1 in that the ring 22 is replaced by a corresponding extension of the edge 14 'of the yoke assembly 14 and that the Zentriermembranen 23 is formed as a flat disc.
  • the centering diaphragm 23 is connected to the end faces 24 of the rim 14 'and the bottom 17 "of the voice coil bobbin 17, resulting in further manufacturing advantages.
  • the centering diaphragm 23 and / or the bottom 17 "of the voice coil bobbin 17 may be provided with corresponding apertures (not shown) for producing the centricity of the voice coil 16 to the permanent magnet 15.
  • FIG. 3 shows in more detail a voice coil carrier 17 for a driver for driving a sound panel 11 according to FIG. 1 or FIG. 2. 3 clearly shows that the edge 17 'of the voice coil bobbin 17 has a region 25 with reduced wall thickness and that the voice coil 16 is disposed in this region 25. Due to the relatively thick-walled design of the voice coil bobbin 17 ensures that required for the drive of the Klangpaneels 11 forces are transmitted largely free of deformation losses on the Klangpaneel 11. The thin-walled region 25 ensures that, despite the relatively thick-walled voice coil carrier 17 i.ü. the air gap 18 ( Figure 1) can be made very narrow and thus at the same time also very low loss.
  • stage 26 between the thin-walled portion 25 and the remaining voice coil bobbin acts as an additional anchorage of the voice coil 16 on the voice coil bobbin 17.
  • a centering diaphragm 23 is shown, which is curved and is connected to the voice coil bobbin 17.
  • the voice coil bobbin 17 is formed in two parts as shown in FIG. 4 and consists of a relatively thick-walled pot 27 and a thin-walled tube 27 '.
  • the tube 27 ', which is provided with the voice coil 16 is connected to the pot 27.
  • This bipartite nature of the voice coil bobbin 17 has the advantage that the unit of voice coil 16 and tube 27 'can be manufactured on devices which are also used in the manufacture of such cone speaker units.
  • the voice coil bobbin 17 is connected to the end faces 24 of the edge 14 'of the yoke assembly 14 by means of a flat centering diaphragm 23.
  • this plate is designed as a piezoelectric bending wave disc 19 'and inserted into the bottom 17 "of the voice coil bobbins 17 and decoupled with the voice coil bobbin 17 (not shown) connected.
  • This combination of piezoelectric bending wave disk 19 'and electromagnetic driver 12 has the advantage that it is available in a confined space for different frequency ranges optimized drivers (12, 19') are available.
  • FIG. 5 shows a further embodiment of a voice coil carrier 17 according to FIG. 3.
  • This one-piece voice coil bobbin 17 is designed so that its bottom 17 "has a reduced diameter compared to the diameter of the rim 17. If the voice coil bobbin 17 is formed as shown in FIG. 5, the use of the plate shown in FIG 19 can be dispensed with, because over the diameter of the bottom 17 "of a voice coil bobbin 17 as shown in FIG. 5, the desired distances A (Fig. 1) can be easily adjusted.

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

Description

Technisches GebietTechnical area

Die Erfindung befaßt sich mit der Ausbildung von Treibern für flache. Klangpaneele, insbesondere mit der Bildung von Treibern, die bei einer Vielzahl von Klangpaneelen als vorgefertigtes Bauteil verwendet werden können.The invention is concerned with the formation of drivers for flat. Sound panels, especially with the formation of drivers, which can be used as a prefabricated component in a variety of sound panels.

Stand der TechnikState of the art

Gemäß dem Stand der Technik sind Klangpaneele bekannt, die nach dem Multiresonanzprinzip arbeiten und auch als Multiresonanzplattenlautsprecher bekannt sind. Nähere Einzelheiten zu diesen Anordnungen sind den Anmeldungen DE-A-197 57 097 . bis 197 57 099 sowie weiteren Anmeldungen der Anmelderin, welche unter dem Anmeldetag dieser Anmeldung hinterlegt wurden, entnehmbar.According to the prior art, sound panels are known which operate according to the multi-resonance principle and are also known as multi-resonant panel loudspeakers. Further details of these arrangements are the applications DE-A-197 57 097 , to 197 57 099 and other applications of the applicant, which were filed under the filing date of this application, removable.

Um im jeweiligen Klangpaneel Biegewellen zu erzeugen, wird dieses von einem oder auch von mehreren elektrodynamischen Treibern (Shakern) angeregt. Auch sind Klangpaneele bekannt, die ausschließlich oder auch kombiniert mit den eben benannten elektrodynamischen Treibern von piezoelektrischen Biegeschwingerscheiben angetrieben werden. Gegenstand dieser Anmeldung sind aber nur die elektrodynamische Treiber.To generate bending waves in the respective sound panel, this is excited by one or more electrodynamic drivers (shakers). Sound panels are also known, which are driven exclusively or combined with the above-mentioned electrodynamic drivers of piezoelectric bending oscillator discs. However, the subject of this application are only the electrodynamic drivers.

Beispielsweise aus der US 3,801,943 ist ein Treiber für ein flaches Klangpaneel bekannt, der einen Schwingspulenträger, auf welchem eine Schwingspule befestigt ist, sowie wenigstens einen Dauermagneten, eine Rückschlußanordnung und einen Luftspalt, in welchen der Schwingspulenträger mit der Schwingspule eintaucht, aufweist, wobei der Schwingspulenträger mit dem Dauermagneten und/oder der Rückschlußanordnung mittels einer elastischen Membran verbunden ist.For example, from the US 3,801,943 a driver for a flat sound panel is known, which has a voice coil bobbin on which a voice coil is mounted, and at least one permanent magnet, a yoke assembly and an air gap in which the voice coil bobbin dives with the voice coil, the voice coil bobbin with the permanent magnet and / or the yoke assembly is connected by means of an elastic membrane.

Diese Treiber werden im wesentlichen von einem mit einer Schwingspule versehenen Schwingspulenträger, wenigstens einem Dauermagneten und einer Rückschtußanordnung gebildet; wobei durch die gegenseitige Anordnung der verschiedenen Bauteile die Schwingspule in einen vorhandenen Luftspalt eintaucht. Schon an dieser Stelle sei darauf hingewiesen, daß die Rückschlußanordnung auch solche Anordnungen umfaßt, die die magnetischen Feldlinien lediglich lenken oder leiten. Auch ist der Luftspalt im Sinne dieser Anmeldung nicht bloß als Spalt zwischen Bauteilen zu verstehen, in den der Schwingspulenträger bzw. die Schwingspule eintaucht.These drivers are essentially formed by a voice coil provided with a voice coil former, at least one permanent magnet and a Rückschussußanordnung; wherein the voice coil dives into an existing air gap by the mutual arrangement of the various components. It should be noted at this point that the yoke assembly also includes such arrangements that merely direct or direct the magnetic field lines. The air gap in the sense of this application is not to be understood merely as a gap between components into which the voice coil former or the voice coil is immersed.

Die Kombination zwischen Klangpaneel und elektrodynamischen Treibern ist so gelöst, daß die Treiber an einer Seite des Klangpaneels aufgesetzt oder in diesem integriert werden. Werden die Treiber an eine Seite des Klangpaneels aufgesetzt, kann auf Treiberprinzipien zurückgegriffen werden, die auch zum Antrieb von Konuslautsprechern verwendet werden. Im Einzelnen ist dies so realisiert, daß die aus der Rückschlußanordnung und den jeweiligen Dauermagneten gebildete Einheit mittels von Halterungen mit dem Klangpaneel verbunden wird. Die Schwingspule, welche auf das Klangpaneel wirkt und zu diesem Zweck ebenfalls mit diesem verbunden ist, kann bei dieser Ausführungsform über die von den Konuslautsprechern her bekannten Zentriermembranen zentriert werden. Dazu ist die Zentriermembran, welche mit dem Schwingspulenträger verbunden ist, an der Halterung befestigt. Auch wenn solche Einheiten unter Nutzung der aus der Konuslautsprechertechnik bekannten Fertigkeiten in großen Stückzahlen preiswert hergestellt werden können, ist der Einsatz dieser Treiber bei flachen Klangpaneelen mit einer Reihe von Nachteilen behaftet. Abgesehen davon, daß aufgesetzte Treiber zu einer Vergrößerung der Bautiefe führen, wird durch die Verwendung der bei dieser Antriebstechnik notwendigen Halterungen eine Versteifung des Klangpaneels herbeigeführt, welche die Einprägung und Ausbreitung von Biegewellen im Klangpaneel behindert.The combination between sound panel and electrodynamic drivers is solved by placing the drivers on one side of the sound panel or integrating them into it. If the drivers are attached to one side of the sound panel, it is possible to resort to driver principles that are also used to drive cone speakers. In detail, this is realized so that the unit formed from the yoke assembly and the respective permanent magnet is connected by means of brackets with the Klangpaneel. The voice coil, which acts on the Klangpaneel and is also connected for this purpose with this, can be centered in this embodiment on the known from the cone speakers ago Zentriermembranen. For this purpose, the centering diaphragm, which is connected to the voice coil bobbin, attached to the holder. Although such units can be inexpensively manufactured in large numbers using the skills known from cone speaker technology, the use of these drivers in flat sound panels has a number of disadvantages. Apart from the fact that patch drivers lead to an increase in depth, a stiffening of the sound panel is brought about by the use of necessary in this drive technology brackets, which hinders the imprint and propagation of bending waves in the Klangpaneel.

Aus diesen Gründen heraus ist man dazu übergegangen, auf Halterungen gänzlich zu verzichten und die Treiber im Klangpaneel zu integrieren. Derartige Anordnungen sind der DE-A-197 57 097 entnehmbar. Wesentlich bei diesen Anordnungen ist, daß der Schwingspulenträger bzw. die Schwingspule nicht mit den übrigen Bauteilen des Treibers (Rückschlußanordnung, Dauermagnet) verbunden ist. Dies bedeutet, daß der Aufbau solcher Anordnungen außerordentlich aufwendig ist, um eine streifende Berührung zwischen dem Schwingspulenträger bzw. der Schwingspule und den übrigen Bauteilen des Treibers während des Betriebs auszuschließen. Die Verwendung einer aus der Konuslautsprechertechnik bekannten Zentriermenbran zwischen dem Schwingspulenträger und dem Klangpaneel in Fig. 1 gemäß DE-A- 197 57 097 könnte dieses Problem sicherlich lösen. Damit ist aber immer noch nicht das weitere Problem beseitigt, daß bei den im Klangpaneel angeordneten Treibern immer noch eine paßgenaue Zuordnung zwischen den übrigen Bauteilen des Treibers (= den Teil 17.4 in Fig. 1 gemäß DE-A-197 57097 ) und der Schwingspule im Klangpaneel selbst herbeigeführt werden muß.For these reasons, one has gone over to completely dispense with brackets and integrate the drivers in the sound panel. Such arrangements are the DE-A-197 57 097 removable. Essential in these arrangements is that the voice coil former or the voice coil is not connected to the other components of the driver (yoke assembly, permanent magnet). This means that the structure of such arrangements is extremely expensive to exclude a grazing contact between the voice coil former or the voice coil and the other components of the driver during operation. The use of a Zentriermenbran known from the cone loudspeaker technology between the voice coil bobbin and the sound panel in Fig. 1 according to DE-A-197 57 097 could certainly solve this problem. However, this still does not eliminate the further problem that in the sound panel arranged drivers still fit exactly between the other components of the driver (= the part 17.4 in Fig. 1 according to DE-A-197 57097 ) and the voice coil in the sound panel itself must be brought about.

Daher liegt der Erfindung die Aufgabe zugrunde, einen Treiber für ein Klangpaneel anzugeben, welcher für eine Vielzahl von Anwendungsfällen vorproduziert werden und ohne weitere Zentrierungsarbeiten im Klangpaneel integriert werden kann.Therefore, the invention has for its object to provide a driver for a sound panel, which are pre-produced for a variety of applications and can be integrated without further centering in Klangpaneel.

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 abhängigen Ansprüchen entnehmbar.This object is achieved with the features specified in claim 1. Advantageous embodiments and further developments of the invention can be taken from the dependent claims.

Wird der Schwingspulenträger im Luftspalt mit den Dauermagneten und/oder der Rückschlußanordnung mittels einer elastischen Membran verbunden, ist ein Treiber geschaffen, der ohne weitere Zentrierungsarbeiten in einem Klangpaneel integriert werden kann.If the voice coil bobbin in the air gap with the permanent magnet and / or the yoke assembly connected by means of an elastic membrane, a driver is created, which can be integrated without further centering in a sound panel.

Da der dem Dauermagneten abgewandte Boden der Rückschlußanordnung mit einer Ankerplatte versehen und über diese mit dem Klangpaneel verbunden ist, wird eine einfachere Montage des Treibers ermöglicht.Since the remote from the permanent magnet bottom of the yoke assembly is provided with an anchor plate and connected via this with the Klangpaneel, a simpler installation of the driver is possible.

Ist gemäß Anspruch 2 der Schwingspulenträger topfförmig ausgebildet und gemäß Anspruch 3 sein Boden mit dem Klangpaneel verbunden, wird im Gegensatz zu den sonst üblichen ringförmigen Schwingspulenträgern eine relativ großflächige Anregung des Klangpaneels hervorgerufen.Is in accordance with claim 2, the voice coil support pot-shaped and connected according to claim 3, its bottom to the Klangpaneel, in contrast to the usual ring-shaped voice coil carriers, a relatively large-scale excitation of the sound panel caused.

Letzteres gilt insbesondere dann, wenn gemäß Anspruch 4 der Boden selbst oder eine zwischen dem Boden und dem Klangpaneel angeordnete Platte einen Durchmesser hat, der kleiner /gleich dem Durchmesser des Sclzwingspulenträgers ist.The latter applies in particular if, according to claim 4, the floor itself or a plate arranged between the floor and the sound panel has a diameter which is smaller than or equal to the diameter of the clamping coil support.

Besonders vorteilhaft ist es, wenn der Boden selbst oder die Platte als piezoelektrischer Biegewellensclnvinger ausgebildet ist, weil in diesem Fall durch die enge räumliche Verbindung zweier Treiber sich deren Kontaktierung vereinfacht. In diesem Falle sollte aber zur Vermeidung einer gegenseitigen . Beeinflussung von Treiber und piezoelektrischem Biegewellenschwinger der piezoelektrische Biegewellenschwinger mit dem Schwingspulenträger des Treiber entkoppelt verbunden sein.It is particularly advantageous if the base itself or the plate is designed as a piezoelectric bending wave scanner, because in this case its contacting is simplified by the close spatial connection of two drivers. In this case, however, to avoid a mutual. Influencing driver and piezoelectric bending wave oscillator, the piezoelectric bending wave oscillator with the voice coil carrier of the driver to be decoupled connected.

Weist der Rand des Schwingspulenträgers einen Bereich mit verminderter Wandstärke auf und ist in diesem Bereich die Schwingspule mit dem Schwingspulenträger verbunden, können dank der massiveren Ausgestaltung des Schwingspulen große Kräfte übertragen werden, ohne daß Wickelvorrichtungen, die für das Wickeln von Schwingspulen auf dünnwandigen Schwingspulenträgern ausgelegt sind, modifiziert werden müssen. Ist der Übergang vom Bereich verminderter Wandstärke zum übrigen Rand des Schwingspulenträgers als Stufe ausgebildet, muß wegen der durch die Stufe gegebenen zusätzlichen Verzahnung der Schwingspule auf dem Schwingspulenträger auch eine Ablösung der Schwingspule vom Schwingspulenträger selbst bei großen Übertragungskräften nicht befürchtet werden.Has the edge of the voice coil bobbin an area with reduced wall thickness and is connected in this area the voice coil with the voice coil bobbin, large forces can be transmitted thanks to the massive design of the voice coil without winders that are designed for winding voice coils on thin-walled voice coil bobbins , must be modified. If the transition from the area of reduced wall thickness to the remaining edge of the voice coil bobbin is designed as a step, because of the given by the stage additional teeth of the voice coil on the voice coil bobbin and a replacement of the voice coil from the voice coil bobbin even with large transmission forces must not be feared.

Schon an dieser Stelle sei darauf hingewiesen, daß ein gemäß den Ansprüchen 2, 3,4 und 6 ausgebildeter Schwingspulenträger eigenständig verwendbar ist.It should be noted at this point that a trained according to claims 2, 3, 4 and 6 voice coil carrier is used independently.

Kurze Darstellung der FigurenShort illustration of the figures

Es zeigen:

Fig. 1
einen Schnitt durch ein Klangpaneel;
Fig. 2
eine weitere Darstellung gemäß Fig. 1;
Fig. 3
einen Schnitt durch einen Schwingspulenträger;
Fig. 4
eine weitere Darstellung gemäß Fig. 3; und
Fig. 5
eine weitere Darstellung gemäß Fig. 3.
Show it:
Fig. 1
a section through a sound panel;
Fig. 2
a further illustration of FIG. 1;
Fig. 3
a section through a voice coil bobbin;
Fig. 4
a further illustration of FIG. 3; and
Fig. 5
a further illustration of FIG. 3.

Wege zum Ausführen der ErfindungWays to carry out the invention

Die Erfindung soll nun anhand der Figuren näher erläutert werden.The invention will now be explained in more detail with reference to FIGS.

Die in Fig. 1 gezeigte Anordnung zeigt ein Klangpaneel 11, welches aus einer aus Hartschaum gebildeten Kernschicht 11' und zwei mit der Kernschicht 11' verbundenen Deckschichten 11" besteht. Ferner zeigt Fig. 1 einen elektromagnetischen Treiber 12, welcher in eine Ausfräsung im Klangpaneel 11 eingesetzt ist.The arrangement shown in Fig. 1 shows a sound panel 11, which consists of a core layer 11 'formed of rigid foam and two cover layers 11 "connected to the core layer 11' Further, Fig. 1 shows an electromagnetic driver 12, which in a cutout in Klangpaneel 11 is used.

Dieser Treiber 12 wird im wesentlichen von einer topfförmig ausgebildeten Rückschlußanordnung 14, einem Dauermagneten 15 und einem mit einer Schwingspule 16 versehenen Schwingspulenträger 17 gebildet. Der Dauermagnet ist in die topfförmige ausgebildete Rückschlußanordnung eingesetzt und verbunden. Da der Durchmesser des Dauermagneten 15 kleiner ist als der Innendurchmesser der topfförmig ausgebildeten Rückschlußanordnung 14, besteht zwischen diesen Teilen (14, 15) ein gegenseitiger radialer Abstand, welcher im Zusammenhang mit dieser Anmeldung als Luftspalt 18 bezeichnet wird.This driver 12 is essentially formed by a pot-shaped yoke assembly 14, a permanent magnet 15 and a voice coil 17 provided with a voice coil 17. The permanent magnet is inserted and connected in the cup-shaped return yoke assembly. Since the diameter of the permanent magnet 15 is smaller than the inner diameter of the cup-shaped yoke assembly 14, there is a mutual radial distance between these parts (14, 15), which is referred to as air gap 18 in the context of this application.

Der Schwingspulenträger 17, welcher gleichfalls topfförmig ausgebildete ist, ist an seinem mit der Schwingspule 16 versehenen Rand 17' in den Luftspalt 18 eingesetzt. Der Boden 17" des Schwingspulenträgers 17 ist unter Zwischenordnung einer Platte 19 mit dem Boden 20 der Ausfräsung 13 verbunden. Schon an dieser Stelle sei darauf hingewiesen, daß eine gesonderte Platte 19 dann nicht notwendig ist, wenn die Platte 19 durch eine entsprechende Gestaltung des Bodens 17" des Schwingspulenträgers 17 und/oder des Bodens 20 der Ausfräsung 13 ersetzt wird.The voice coil bobbin 17, which is likewise pot-shaped, is inserted into the air gap 18 at its edge 17 'provided with the voice coil 16. The bottom 17 "of the voice coil bobbin 17 is under Intermediate arrangement of a plate 19 connected to the bottom 20 of the cutout 13. Already at this point it should be noted that a separate plate 19 is not necessary if the plate 19 is replaced by a corresponding design of the bottom 17 "of the voice coil bobbin 17 and / or the bottom 20 of the cutout 13.

Deutlich ist der Darstellung gemäß Fig. 1 entnehmbar, daß die Platte 19 im Vergleich zum Schwingspulenträger 17 einen kleineren Durchmesser hat. Diese Durchmesserverringerung bewirkt eine verbesserte Einprägung von Biegewellen in das Klangpaneel 11, weil zum einen die Krafteinprägung auf eine kleine Fläche konzentriert ist und sich zum weiteren hierdurch auch der für die Erzeugung von . Biegewellen wesentliche radiale Abstand A zwischen dem Bereich, an dem die Krafteinleitung erfolgt, und dem Bereich, in welchem der unter Betriebsbedingungen nicht schwingende Teil des Treibers 12 mit dem Klangpaneel 11 verbunden ist, vergrößert ist.It can clearly be seen from the illustration according to FIG. 1 that the plate 19 has a smaller diameter compared to the voice coil former 17. This reduction in diameter causes an improved impression of bending waves in the Klangpaneel 11, because on the one hand, the force is concentrated on a small area and, moreover, this also for the production of. Biegewellen essential radial distance A between the area where the force is applied, and the area in which the non-vibrating under operating conditions part of the driver 12 is connected to the Klangpaneel 11, is increased.

Der dem Dauermagneten 15 abgewandte Boden der Rückschlußanordnung ist mit einer Ankerplatte 21 versehen und über diese mit dem Klangpaneel 11 verbunden.The remote from the permanent magnet 15 bottom of the yoke assembly is provided with an anchor plate 21 and connected via this with the Klangpaneel 11.

Um den Treiber 12 für eine Vielzahl von Anwendungen vorzuproduzieren bzw. um beim Zusammenbau von Treiber 12 und Klangpaneel 11 aufwendige Zentrierungsarbeiten zu vermeiden, ist im in Fig. 1 gezeigten Ausführungsbeispiel der Rand 14' der Rückschlußanordnung 14 mit einem Ring 22 versehen, welcher den Rand 14' in Richtung der Platte 19 verlängert. Außerdem ist eine Zentriermembranen 23 vorhanden, welche sich im Luftspalt 18 zwischen dem Ring 22 und dem Rand 17' des Schwingspulenträgers 17 erstreckt. Wird der Treiber 12 gemäß Fig. 1 ausgebildet, kann die Verbindung zwischen Treiber 12 und Klangpaneel 11 sehr einfach dadurch realisiert werden, daß der vorproduzierte und bereits mit der Ankerplatte 21 versehene Treiber 12 lediglich in die Ausfräsung 13 im Klangpaneel 11 eingesetzt und verbunden wird. Ob der Schwingspulenträger 17 schon werksseitig mit der Platte 19 verbunden ist oder ob diese Verbindung erst später realisiert wird, ist ohne Bedeutung, wenn die Platte 19 lediglich gegenüber dem Schwingspulenträger 17 eine Durchmesser Verringerung sicherstellen soll. Wird jedoch die Platte 19 -wie im Zusammenhang mit Fig. 4 noch erläutert werden wird- als piezoelektrische Biegenwellenscheibe ausgebildet, ergeben sich in bezug auf die Kontaktierung Vorteile, wenn die als Biegenwellenscheibe ausgebildete Platte 19 schon werksseitig, d.h. vor ihrem Verbinden mit dem Boden 20 bereits mit dem Schwingspulenträger 17 verbunden war.To vorzuproduzieren the driver 12 for a variety of applications or to avoid complex centering when assembling driver 12 and sound panel 11, in the embodiment shown in FIG. 1, the edge 14 'of the yoke assembly 14 is provided with a ring 22 which surrounds the edge Extended 14 'in the direction of the plate 19. In addition, a Zentriermembranen 23 is present, which extends in the air gap 18 between the ring 22 and the edge 17 'of the voice coil bobbin 17. If the driver 12 according to FIG. 1 is formed, the connection between the driver 12 and the sound panel 11 can be realized very simply by inserting and connecting the pre-produced driver 12 already provided with the armature plate 21 only into the cutout 13 in the sound panel 11. Whether the voice coil bobbin 17 is already connected to the plate 19 at the factory or whether this connection is realized later, is irrelevant if the plate 19 is to ensure only a diameter reduction relative to the voice coil bobbin 17. However, if the plate 19, as will be explained in connection with FIG. 4, is designed as a piezoelectric bending wave disk, advantages arise with respect to the contacting when the plate 19 designed as a bending wave disk is already in the factory, ie before its connection to the bottom 20 was already connected to the voice coil bobbin 17.

Nur der Vollständigkeit halber sei darauf hingewiesen, daß zur Einstellung der gewünschten Radialabstände zwischen dem Dauermagneten 15 und dem Schwingspulenträger 17 bzw. zwischen der Schwingspule 16 und dem Rand 14' der Rückschlußanordnung 17 die Zentriermembran 23 und/oder der Boden 17" des Schwingspulenträgers 17 Durchbrüche (nicht gezeigt) aufweisen kann, durch welche bei der Montage des in Fig. 1 gezeigten Treibers 12 Abstandhalter (nicht gezeigt) eingeschoben werden können. Soll auf Durchbrüche in der Zentriermembran 23 und/oder dem Boden 17" verzichtet werden, kann die erforderliche Zentrierung auch mittel eines zentrisch durch den Dauermagneten 15 und die Rückschlußanordnung 17 geführten Stifts (nicht gezeigt) erfolgen, welcher je nach Ausführung auch erst in der Kernschicht 11' enden kann.Only for the sake of completeness it should be noted that to set the desired radial distances between the permanent magnet 15 and the voice coil bobbin 17 and between the voice coil 16 and the edge 14 'of the yoke assembly 17, the centering diaphragm 23 and / or the bottom 17 "of the voice coil bobbin 17 breakthroughs (not shown), through which spacers (not shown) can be inserted during assembly of the driver 12 shown in Fig. 1. If openings in the centering membrane 23 and / or the bottom 17 "are to be dispensed with, the required centering can be achieved also means of a centric guided by the permanent magnet 15 and the yoke assembly 17 pin (not shown), which depending on the design and only in the core layer 11 'can end.

Das in Fig. 2 gezeigte Ausführungsbeispiel unterscheidet sich von dem Ausführungsbeispiel gemäß Fig. 1 dadurch, daß der Ring 22 durch eine entsprechende Verlängerung der Randes 14' der Rückschlußanordnung 14 ersetzt ist und daß die Zentriermembranen 23 als flache Scheibe ausgebildet ist. Außerdem ist in Fig. 2 die Zentriermembrane 23 mit den Stirnflächen 24 des Randes 14' und dem Boden 17" des Schwingspulenträgers 17 verbunden, wodurch sich weitere Herstellungsvorteile ergeben.The embodiment shown in Fig. 2 differs from the embodiment of FIG. 1 in that the ring 22 is replaced by a corresponding extension of the edge 14 'of the yoke assembly 14 and that the Zentriermembranen 23 is formed as a flat disc. In addition, in Fig. 2, the centering diaphragm 23 is connected to the end faces 24 of the rim 14 'and the bottom 17 "of the voice coil bobbin 17, resulting in further manufacturing advantages.

Auch in diesem Ausführungsbeispiel kann zur Herstellung der Zentrizität der Schwingspule 16 zum Dauermagneten 15 die Zentriermembrane 23 und/ oder der Boden 17" des Schwingspulenträgers 17 mit entsprechenden Durchbrüchen (nicht gezeigt) versehen sein.Also in this embodiment, the centering diaphragm 23 and / or the bottom 17 "of the voice coil bobbin 17 may be provided with corresponding apertures (not shown) for producing the centricity of the voice coil 16 to the permanent magnet 15.

In Fig. 3 ist ein Schwingspulenträger 17 für einen Treiber zum Antrieb eines Klangpaneels 11 gemäß Fig. 1 oder Fig. 2 näher dargestellt. Deutlich ist der Darstellung gemäß Fig. 3 entnehmbar, daß der Rand 17' des Schwingspulenträgers 17 einen Bereich 25 mit verminderter Wandstärke aufweist und daß die Schwingspule 16 in diesem Bereich 25 angeordnet ist. Durch die relativ dickwandige Ausbildung des Schwingspulenträgers 17 wird sichergestellt, daß für den Antrieb des Klangpaneels 11 erforderlichen Kräfte weitgehend frei von Verformungsverlusten auf das Klangpaneel 11 übertragen werden. Der dünnwandige Bereich 25 gewährleistet, daß trotz des relativ dickwandigen Schwingspulenträgers 17 i.ü. der Luftspalt 18 (Fig.1) sehr schmal und damit gleichzeitig auch sehr verlustarm ausgebildet werden kann. Außerdem wirkt die Stufe 26 zwischen dem dünnwandigen Bereich 25 und dem übrigen Schwingspulenträger als zusätzliche Verankerung der Schwingspule 16 auf dem Schwingspulenträger 17. Ferner ist in Fig. 3 noch eine Zentriermembrane 23 gezeigt, welche gewölbt ausgebildet ist und mit dem Schwingspulenträger 17 verbunden ist.FIG. 3 shows in more detail a voice coil carrier 17 for a driver for driving a sound panel 11 according to FIG. 1 or FIG. 2. 3 clearly shows that the edge 17 'of the voice coil bobbin 17 has a region 25 with reduced wall thickness and that the voice coil 16 is disposed in this region 25. Due to the relatively thick-walled design of the voice coil bobbin 17 ensures that required for the drive of the Klangpaneels 11 forces are transmitted largely free of deformation losses on the Klangpaneel 11. The thin-walled region 25 ensures that, despite the relatively thick-walled voice coil carrier 17 i.ü. the air gap 18 (Figure 1) can be made very narrow and thus at the same time also very low loss. In addition, the stage 26 between the thin-walled portion 25 and the remaining voice coil bobbin acts as an additional anchorage of the voice coil 16 on the voice coil bobbin 17. Furthermore, in Fig. 3, a centering diaphragm 23 is shown, which is curved and is connected to the voice coil bobbin 17.

Im Gegensatz zum Schwingspulenträger 17 gemäß Fig. 3 ist der Schwingspulenträger 17 gemäß Fig. 4 zweiteilig ausgebildet und besteht aus einem relativ dickwandigen Topf 27 und einem dünnwandigen Rohr 27'. Das Rohr 27', welches mit der Schwingspule 16 versehen ist, ist mit dem Topf 27 verbunden. Diese Zweiteiligkeit des Schwingspulenträgers 17 hat den Vorteil, daß die Einheit aus Schwingspule 16 und Rohr 27' auf Vorrichtungen hergestellt werden kann, die auch bei der Herstellung solcher Einheiten für Konuslautsprecher verwendet werden.In contrast to the voice coil bobbin 17 shown in FIG. 3, the voice coil bobbin 17 is formed in two parts as shown in FIG. 4 and consists of a relatively thick-walled pot 27 and a thin-walled tube 27 '. The tube 27 ', which is provided with the voice coil 16 is connected to the pot 27. This bipartite nature of the voice coil bobbin 17 has the advantage that the unit of voice coil 16 and tube 27 'can be manufactured on devices which are also used in the manufacture of such cone speaker units.

Wie schon im Zusammenhang mit Fig. 2 erläutert, ist auch in Fig. 4 der Schwingspulenträger 17 mittels einer flachen Zentriermembrane 23 mit den Stirnflächen 24 des Randes 14' der Rückschlußanordnung 14 verbunden.As already explained in connection with FIG. 2, in FIG. 4 the voice coil bobbin 17 is connected to the end faces 24 of the edge 14 'of the yoke assembly 14 by means of a flat centering diaphragm 23.

Abweichend zu der in Fig. 2 gezeigten und lediglich als Distanzstück dienenden Platte 19 ist in Fig. 4 diese Platte als piezoelektrische Biegewellenscheibe 19' ausgestaltet und in den Boden 17" des Schwingspulenträgern 17 eingelassen und mit dem Schwingspulenträger 17 entkoppelt (nicht gezeigt) verbunden. Diese Kombination von piezoelektrischer Biegewellenscheibe 19' und elektromagnetischem Treiber 12 hat den Vorteil, daß damit auf engstem Raum für unterschiedliche Frequenzbereiche optimiert ausgelegte Treiber (12, 19') zur Verfügung stehen.Notwithstanding the shown in Fig. 2 and serving only as a spacer plate 19 in Fig. 4, this plate is designed as a piezoelectric bending wave disc 19 'and inserted into the bottom 17 "of the voice coil bobbins 17 and decoupled with the voice coil bobbin 17 (not shown) connected. This combination of piezoelectric bending wave disk 19 'and electromagnetic driver 12 has the advantage that it is available in a confined space for different frequency ranges optimized drivers (12, 19') are available.

In Fig. 5 ist eine weitere Ausführungsform eines Schwingspulenträgers 17 gemäß Fig. 3 gezeigt. Dieser einteilige Schwingspulenträger 17 ist so gestaltet, daß dessen Boden 17" gegenüber dem Durchmesser des Randes 17'einen verminderten Durchmesser hat. Wird der Schwingspulenträger 17 gemäß Fig. 5 ausgebildet, kann wegen dieser Formgebung auf die Verwendung der beispielsweise in Fig. I gezeigten Platte 19 verzichtet werden, da über den Durchmesser des Bodens 17" eines Schwingspulenträgers 17 gemäß Fig. 5 die gewünschten Abstände A (Fig. 1) problemlos eingestellt werden können.FIG. 5 shows a further embodiment of a voice coil carrier 17 according to FIG. 3. This one-piece voice coil bobbin 17 is designed so that its bottom 17 "has a reduced diameter compared to the diameter of the rim 17. If the voice coil bobbin 17 is formed as shown in FIG. 5, the use of the plate shown in FIG 19 can be dispensed with, because over the diameter of the bottom 17 "of a voice coil bobbin 17 as shown in FIG. 5, the desired distances A (Fig. 1) can be easily adjusted.

Claims (7)

  1. An acoustic panel with a driver (12), which includes a moving coil carrier (17) to which a moving coil (16) is secured, and at least one permanent magnet (15), a flux guide device (14) and an air gap (18), into which the moving coil carrier (17) with the moving coil (16) enters, wherein the moving coil carrier (17) is connected to the permanent magnet (15) and/or the flux guide device (14) by means of an elastic membrane (23), characterised in that the base, remote from the permanent magnet (15), of the flux guide device (14) is provided with an anchor plate (21) and is directly connected by the latter to the acoustic panel (11).
  2. An acoustic panel with a driver (12) as claimed in Claim 1, characterised in that the moving coil carrier (17) is of cup-shape and has a base (17") and an edge (17).
  3. An acoustic panel with a driver (12) as claimed in Claim 2, characterised in that the base (17") of the moving coil carrier (17) is connected to the acoustic panel (11).
  4. An acoustic panel with a driver (12) as claimed in Claim 3, characterised in that the base (17") or a plate (19) disposed between the base (17") and acoustic panel (11) has a diameter which is smaller than or equal to the diameter of the edge (17') of the moving coil carrier (17).
  5. An acoustic panel with a driver (12) as claimed in Claim 4, characterised in that the base (17") itself or the plate (19) is constructed in the form of a piezo-electric flexural wave disk (19').
  6. An acoustic panel with a driver (12) as claimed in one of Claims 2 to 5, characterised in that the edge (17') of the moving coil carrier (17) has a region (25) of reduced wall thickness and that the moving coil (16) is connected to the moving coil carrier (17) in the region (25) of the reduced wall thickness.
  7. An acoustic panel with a driver (12) as claimed in one of Claims 1 to 6, characterised in that the driver (12) is inserted into a recess (13) in the acoustic panel (11).
EP99923592A 1998-05-15 1999-05-14 FLAT ACOUSTIC PANEL with driver Expired - Lifetime EP1077014B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19821860A DE19821860A1 (en) 1998-05-15 1998-05-15 Driver for flat panel loudspeaker
DE19821860 1998-05-15
PCT/EP1999/003305 WO1999060820A1 (en) 1998-05-15 1999-05-14 Driver for a flat acoustic panel

Publications (2)

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EP1077014A1 EP1077014A1 (en) 2001-02-21
EP1077014B1 true EP1077014B1 (en) 2007-08-08

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EP99923592A Expired - Lifetime EP1077014B1 (en) 1998-05-15 1999-05-14 FLAT ACOUSTIC PANEL with driver

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US (1) US6347149B1 (en)
EP (1) EP1077014B1 (en)
DE (2) DE19821860A1 (en)
WO (1) WO1999060820A1 (en)

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WO1999060820A1 (en) 1999-11-25
EP1077014A1 (en) 2001-02-21
DE59914445D1 (en) 2007-09-20
US6347149B1 (en) 2002-02-12
DE19821860A1 (en) 1999-11-18

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