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EP1079664A2 - Electrodynamic driver - Google Patents

Electrodynamic driver Download PDF

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Publication number
EP1079664A2
EP1079664A2 EP00118512A EP00118512A EP1079664A2 EP 1079664 A2 EP1079664 A2 EP 1079664A2 EP 00118512 A EP00118512 A EP 00118512A EP 00118512 A EP00118512 A EP 00118512A EP 1079664 A2 EP1079664 A2 EP 1079664A2
Authority
EP
European Patent Office
Prior art keywords
driver according
electrodynamic driver
adapter
cavities
cavity
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.)
Granted
Application number
EP00118512A
Other languages
German (de)
French (fr)
Other versions
EP1079664B1 (en
EP1079664A3 (en
Inventor
Wolfgang Dr. Bachmann
Gerhard Dr. Krump
Hans-Jürgen Regl
Andreas Ziganki
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
Original Assignee
Harman Becker Automotive Systems GmbH
Harman Audio Electronic Systems GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Harman Becker Automotive Systems GmbH, Harman Audio Electronic Systems GmbH filed Critical Harman Becker Automotive Systems GmbH
Publication of EP1079664A2 publication Critical patent/EP1079664A2/en
Publication of EP1079664A3 publication Critical patent/EP1079664A3/en
Application granted granted Critical
Publication of EP1079664B1 publication Critical patent/EP1079664B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • 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 relates to an electrodynamic driver for a membrane with one on a tubular coil support applied voice coil, one with respect to the voice coil concentrically arranged, axially movable magnet system, an adapter for attaching the coil carrier to the membrane, one arranged between the membrane and the magnet system elastic element, with at least one cavity between Forms membrane and magnet system.
  • Record speakers essentially consist of a bracket (Frame), a membrane (plate) and a drive system.
  • the drive system of the plate loudspeaker consists of one or more electromechanical transducers.
  • As a converter only piezoelectric drivers (PVDF foils or Piezo-ceramics) or electrodynamic drivers (Magnetic system / oscillating head) for use.
  • the oscillating head of the electrodynamic driver consists of the voice coil, the coil support, an elastic element and the adapter. Any one for anchoring becomes an adapter of the coil carrier on the plate suitable connecting element designated.
  • a generic driver is e.g. from European Patent EP 0 847 676 B1 known. The transmission quality of the drivers will be different for some However, applications are still considered too small.
  • the object of the invention is an electrodynamic driver to further improve the type mentioned at the beginning.
  • the one voice coil mounted on a tubular coil support, a concentrically arranged with respect to the voice coil, axially movable magnet system, an adapter for fastening of the coil carrier on the membrane and one between the membrane and have a magnet system arranged elastic element
  • Cavities usually form between the membrane and the magnet system.
  • Air-permeable elements can be used to equalize the pressure (e.g. coarse-pored tissue, fleece) that with the outside air in Contact is established and / or pressure compensation channels (e.g. bore, Grooves, notch) leading from the cavity to the outside air become.
  • at least one cavity can have a pressure compensation opening (e.g. windows, slots) to the outside air.
  • means for pressure compensation can also be used be provided between at least two cavities. These can again have air-permeable elements and / or Pressure equalization channels can be connected to one another and / or one have common pressure equalization opening.
  • the pressure equalization openings can be elastic Element introduced.
  • an elastic element circumferential bead are provided, the at least one Has pressure equalization opening and / or is air-permeable.
  • the magnet system and / or the adapter can (also) at least one at least in contact with a cavity standing pressure equalization opening and / or a pressure equalization channel exhibit.
  • the pressure equalization openings explained above serve on the one hand dynamic and static pressure equalization. They also provide cooling for the driver system.
  • a tubular coil support 8a, on which a coil 8 is wound is, by means of an adapter plate 9a and one Adapter foot 9b existing, concentric, one-piece Adapters 9 attached to a plate membrane 12.
  • the plate membrane 12 is opposite in the axial direction of the coil carrier 8a with a coil 8 arranged a magnet system, which forms an air gap 18 in which the coil 8 and partially immerse the coil carrier 8a.
  • the magnet system consists of a ferro-magnetic magnetic pot 4, the the coil 8 on its outer surface and on that of the plate membrane 12 encloses opposite cross-sectional area, and from inside the magnetic pot 4 and the coil carrier 8a arranged permanent magnets 5 in connection with a pole disk 6.
  • the load bead 2 has the task of the magnet system (magnetic pot 4, permanent magnet 5 and pole disc 6) on the plate membrane 12 to fix (for axial movement soft spring, for radial and Tilting movements hard resilient).
  • the load bead 2 could also extend further outwards from the outer edge of the magnet system or further inside. But you could also with one other types of bracket are completely eliminated.
  • the centering bead 7 in turn has Task, the oscillating head (voice coil 8, coil support 8a and Fix adapter 9) to the magnet system (for axial movement soft resilient, hard resilient for radial and tilting movements).
  • the centering bead 7 could also be from the outer edge of the Extend the oscillating head further outwards or further inwards. With a different type of holder, it could also be whole omitted.
  • the load bead 2 from an independent component.
  • it can also Be part of the housing 3 itself, if this is made of compound material exists in which the receiving the magnet system Housing part hard and the load bead part to For the purpose of cushioning is made of softer material.
  • Another cavity (housing chamber 11) is through the housing 3, the centering bead 7, the adapter 3, the voice coil 8 with the coil holder 8a and the air gap 18 are defined.
  • a magnetic chamber 10 are mentioned Cavity through the magnetic pot 4, the permanent magnet 5, the Pole disk 6, the voice coil 8 with coil carrier 8a and enclosed the air gap 18 and a pole chamber 13 called Cavity through adapter 9, the coil holder 8a and the pole disc 6 fixed, wherein in the embodiment axial height hp of the pole chamber 13 advantageously less is as the free height hm in the magnetic chamber 10.
  • Another Cavity adapter chamber 15 is finally from the adapter 9 formed in connection with the plate membrane 12.
  • Pressure compensation takes place from the crimp chamber 17 the housing chamber 11 and the adapter chamber 15 is the centering bead 7 made of air-permeable material, for example made from coarse-pored elastic fabric, which has a plurality of small pressure equalization openings 20.
  • the adapter 9 has a bore that extends from the bead chamber 17 leads to the adapter chamber 15 and as a pressure compensation opening 16 serves between these two chambers.
  • a pressure equalization opening 14 is provided, the pole chamber 13 also with the housing chamber 11 via a pressure equalization opening 21 serving bore in the coil holder 8a connected is. Since the air gap 18 usually one too has a small effective cross section for pressure equalization, is a bore provided as a pressure compensation opening 24 in the magnetic pot 4 introduced such that this the magnetic chamber 10 connects to the outside air. This creates two cavities directly in contact with the outside air while the remaining cavities indirectly at least through these two and possibly also further cavities also with the Outside air contact. This ensures that in there is always external pressure in all cavities.
  • Such pressure equalization openings are in particular also advantageous, even necessary if ferrofluid is in the air gap is used, which would prevent pressure equalization.
  • pressure equalization openings and cavities can also have holes or other recesses in the housing, be provided in the membrane or the pole disk. These holes and recesses also serve as an introduction already mentioned the cooling of the interior of the housing.
  • the pole disk 6 is in the embodiment 2 is T-shaped in cross section and is shown in FIG Contact with a combined weight and load bead 23, in which is an adapter foot 23a, an adapter head 23c and a intervening flexible adapter intermediate ring 23c incorporated are.
  • the adapter with adapter foot 23a, adapter head part 23c and adapter intermediate ring 23c are used for fastening the driver on the sound plate 12.
  • Cavities are formed in particular in this embodiment inside the adapter (adapter chamber 15), between adapter, Voice coil 8 and pole disc 6 (pole chamber 13) and between Pole disk 6, permanent magnet 5 and magnetic pot 4 (magnetic chamber 10).
  • a pressure equalization opening 14 there are adapter chambers 15 and pole chamber 13 connected to each other, wherein the adapter chamber 15 via a pressure equalization opening at 16 is in contact with the outside air.
  • the pressure equalization of the In addition to the air gap 18, the magnetic chamber 10 also takes place by means of a pressure compensation opening formed by a hole in the magnetic pot 24, Finally, could be optional - as with Embodiment according to Figure 1 - also through a hole the coil former 8a is provided as a pressure compensation opening 21 are (not shown in Figure 2).

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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)
  • Electric Cable Installation (AREA)

Abstract

The driver has a moving coil (8) on a tubular coil holder (8a), with a magnet system (4,5,6) arranged concentric to the coil. An adaptor (9) is provided for attaching the coil holder to the diaphragm (12). An elastic element (2,7) is arranged between the diaphragm and the magnet system. A cavity (10,11,15,17) is formed between the diaphragm and the magnet system. An element (7) made of air permeable material is provided for equalising the pressure of the cavity. A pressure equalising channel (24,16) may be provided from the cavity to the outside air.

Description

Die Erfindung betrifft einen elektrodynamischen Treiber für eine Membran mit einer auf einem rohrförmigen Spulenträger aufgebrachten Schwingspule, einem bezüglich der Schwingspule konzentrisch angeordneten, axial beweglichen Magnetsystem, einem Adapter zum Befestigen des Spulenträgers an der Membran, einem zwischen Membran und Magnetsystem angeordneten elastischen Element, wobei sich mindestens ein Hohlraum zwischen Membran und Magnetsystem bildet.The invention relates to an electrodynamic driver for a membrane with one on a tubular coil support applied voice coil, one with respect to the voice coil concentrically arranged, axially movable magnet system, an adapter for attaching the coil carrier to the membrane, one arranged between the membrane and the magnet system elastic element, with at least one cavity between Forms membrane and magnet system.

Plattenlautsprecher bestehen im wesentlichen aus einer Halterung (Rahmen), einer Membran (Platte) und einem Antriebssystem. Das Antriebssystem des Plattenlautsprechers besteht aus einem oder mehreren elektromechanischen Wandlern. Als Wandler kommen derzeit nur piezoelektrische Treiber (PVDF-Folien oder Piezo-Keramiken) oder elektrodynamische Treiber (Magnetsystem/Schwingkopf) zur Anwendung.Record speakers essentially consist of a bracket (Frame), a membrane (plate) and a drive system. The drive system of the plate loudspeaker consists of one or more electromechanical transducers. As a converter only piezoelectric drivers (PVDF foils or Piezo-ceramics) or electrodynamic drivers (Magnetic system / oscillating head) for use.

Der Schwingkopf des elektrodynamischen Treibers besteht aus der Schwingspule, dem Spulenträger, einem elastischen Element und dem Adapter. Als Adapter wird ein beliebiges zur Verankerung des Spulenträgers auf der Platte geeignetes Verbindungselement bezeichnet. Ein derartiger, gattungsgemäßer Treiber ist z.B. aus der Europäischen Patentschrift EP 0 847 676 B1 bekannt. Die Übertragungsqualität der Treiber wird für einige Anwendungen allerdings noch als zu gering angesehen. The oscillating head of the electrodynamic driver consists of the voice coil, the coil support, an elastic element and the adapter. Any one for anchoring becomes an adapter of the coil carrier on the plate suitable connecting element designated. Such a generic driver is e.g. from European Patent EP 0 847 676 B1 known. The transmission quality of the drivers will be different for some However, applications are still considered too small.

Aufgabe der Erfindung ist es, einen elektrodynamischen Treiber der eingangs genannten Art weiter zu verbessern.The object of the invention is an electrodynamic driver to further improve the type mentioned at the beginning.

Die Aufgabe wird durch einen Treiber gemäß Patentanspruch 1 gelöst. Ausgestaltungen und Weiterbildungen des Erfindungsgedankens sind Gegenstand von Unteransprüchen.The object is achieved by a driver according to claim 1 solved. Refinements and developments of the inventive concept are the subject of subclaims.

Bei elektrodynamischen Treibern für eine Membran, die eine auf einem rohrförmigen Spulenträger aufgebrachte Schwingspule, ein bezüglich der Schwingspule konzentrisch angeordnetes, axial bewegliches Magnetsystem, einen Adapter zum Befestigen des Spulenträgers an der Membran sowie ein zwischen Membran und Magnetsystem angeordnetes elastisches Element aufweisen, bilden sich meistens Hohlräume zwischen Membran und Magnetsystem. Erfindungsgemäß wurde festgestellt, daß die darin eingeschlossene Luft bei Bewegung der Membran wie ein zusätzliches elastisches Element wirkt, das selbst von äußeren Einflüssen (z.B. Luftdruck, Temperatur) abhängig ist und seinerseits entsprechend die Übertragungseigenschaften des Treibers beeinflußt. Die Erfindung sieht daher Mittel zum Druckausgleich des mindestens einen Hohlraums vor.In the case of electrodynamic drivers for a membrane, the one voice coil mounted on a tubular coil support, a concentrically arranged with respect to the voice coil, axially movable magnet system, an adapter for fastening of the coil carrier on the membrane and one between the membrane and have a magnet system arranged elastic element, Cavities usually form between the membrane and the magnet system. According to the invention it was found that the included therein Air when the membrane moves like an additional one elastic element that acts even from external influences (e.g. air pressure, temperature) is dependent and in turn accordingly the transmission properties of the driver influenced. The invention therefore provides means for pressure compensation of the at least one cavity.

Zum Druckausgleich können dabei luftdurchlässige Elemente (z.B. grobporiges Gewebe, Flies) das mit der Außenluft in Kontakt steht, und/oder Druckausgleichskanäle (z.B. Bohrung, Nute, Kerbe), die vom Hohlraum zur Außenluft führen, vorgesehen werden. Außerdem kann mindestens ein Hohlraum eine Druckausgleichsöffnung (z.B. Fenster, Schlitze) zur Außenluft aufweisen.Air-permeable elements can be used to equalize the pressure (e.g. coarse-pored tissue, fleece) that with the outside air in Contact is established and / or pressure compensation channels (e.g. bore, Grooves, notch) leading from the cavity to the outside air become. In addition, at least one cavity can have a pressure compensation opening (e.g. windows, slots) to the outside air.

Im Falle mehrerer Hohlräume können auch Mittel zum Druckausgleich zwischen mindestens zwei Hohlräumen vorgesehen werden. Diese können wieder über luftdurchlässige Elemente und/oder Druckausgleichskanäle miteinander verbunden sein und/oder eine gemeinsame Druckausgleichsöffnung aufweisen.In the case of several cavities, means for pressure compensation can also be used be provided between at least two cavities. These can again have air-permeable elements and / or Pressure equalization channels can be connected to one another and / or one have common pressure equalization opening.

Die Druckausgleichsöffnungen können dabei in das elastische Element eingebracht sein. Als elastisches Element kann eine umlaufende Sicke vorgesehen werden, die mindestens eine Druckausgleichsöffnung aufweist und/oder luftdurchlässig ist.The pressure equalization openings can be elastic Element introduced. As an elastic element circumferential bead are provided, the at least one Has pressure equalization opening and / or is air-permeable.

Darüber hinaus kann (auch) das Magnetsystem und/oder der Adapter mindestens eine zumindest mit einem Hohlraum in Kontakt stehende Druckausgleichsöffnung und/oder einen Druckausgleichskanal aufweisen.In addition, the magnet system and / or the adapter can (also) at least one at least in contact with a cavity standing pressure equalization opening and / or a pressure equalization channel exhibit.

Die oben erläuterten Druckausgleichsöffnungen dienen zum einen dem dynamischen und zum anderen dem statischen Druckausgleich. Darüber hinaus sorgen sie für eine Kühlung des Treibersystems.The pressure equalization openings explained above serve on the one hand dynamic and static pressure equalization. They also provide cooling for the driver system.

Die Erfindung wird nachfolgend anhand der in den Figuren der Zeichnung gezeigten Ausführungsbeispiele näher erläutert, wobei gleiche Elemente mit den selben Bezugszeichen versehen sind. Es zeigt:

Figur 1
eine bevorzugte erste Ausführungsform eines erfindungsgemäßen Treibers und
Figur 2
eine bevorzugte zweite Ausführungsform eines erfindungsgemäßen Treibers.
The invention is explained in more detail below with reference to the exemplary embodiments shown in the figures of the drawing, the same elements being provided with the same reference numerals. It shows:
Figure 1
a preferred first embodiment of a driver according to the invention and
Figure 2
a preferred second embodiment of a driver according to the invention.

Bei dem in Figur 1 gezeigten elektrodynamischen Treiber 1 ist ein rohrförmiger Spulenträger 8a, auf den eine Spule 8 aufgewickelt ist, mittels eines aus einer Adapterplatte 9a und einem Adapterfuß 9b bestehenden, konzentrischen, einstückigen Adapters 9 an einer Plattenmembran 12 befestigt. Der Plattenmembran 12 gegenüberliegend ist in axialer Richtung des Spulenträgers 8a mit Spule 8 ein Magnetsystem angeordnet, welches einen Luftspalt 18 bildet, in welchem die Spule 8 und teilweise der Spulenträger 8a eintauchen. Das Magnetsystem besteht dabei aus einem ferro-magnetischen Magnettopf 4, der die Spule 8 an ihrer Mantelfläche sowie an der der Plattenmembran 12 gegenüberliegenden Querschnittsfläche umschließt, und aus einem im Inneren des Magnettopfes 4 und des Spulenträgers 8a angeordneten Permanentmagneten 5 in Verbindung mit einer Polscheibe 6. An der Mantelfläche des Magnettopfes 4 ist ein sich in radialer Richtung vom Magnettopf 4 weg sowie in axialer Richtung zur Plattenmembran 12 hin erstreckendes, konzentrisches Gehäuse 3 befestigt, an dem seinerseits die Enden zweier Sicken (eine Zentriersicke 7 und eine Lastsicke 2) angebracht sind. Das andere Ende der Zentriersicke 7 ist dabei mit dem Adapter 9 und das andere Ende der Lastsicke 2 ist in entgegengesetzter Richtung mit der Plattenmembran 12 verbunden.In the electrodynamic driver 1 shown in FIG a tubular coil support 8a, on which a coil 8 is wound is, by means of an adapter plate 9a and one Adapter foot 9b existing, concentric, one-piece Adapters 9 attached to a plate membrane 12. The plate membrane 12 is opposite in the axial direction of the coil carrier 8a with a coil 8 arranged a magnet system, which forms an air gap 18 in which the coil 8 and partially immerse the coil carrier 8a. The magnet system consists of a ferro-magnetic magnetic pot 4, the the coil 8 on its outer surface and on that of the plate membrane 12 encloses opposite cross-sectional area, and from inside the magnetic pot 4 and the coil carrier 8a arranged permanent magnets 5 in connection with a pole disk 6. On the lateral surface of the magnetic pot 4 is a radially away from the magnet pot 4 and extending in the axial direction towards the plate membrane 12, concentric housing 3 attached to which in turn the Ends of two beads (a centering bead 7 and a load bead 2) are attached. The other end of the centering bead 7 is doing so with the adapter 9 and the other end of the load bead 2 is in the opposite direction with the plate membrane 12 connected.

Die Lastsicke 2 hat die Aufgabe, das Magnetsystem (Magnettopf 4, Permanentmagnet 5 und Polscheibe 6) an der Plattenmembran 12 zu fixieren (für Axialbewegung weich federnd, für Radial- und Kippbewegungen hart federnd). Die Lastsicke 2 könnte sich auch vom Außenrand des Magnetsystems weiter nach außen erstrecken oder weiter nach innen. Sie könnte aber auch bei einer andersartigen Halterung ganz entfallen. Zur Vermeidung von statischen Kippmomenten greift die Lastsicke 2 in der Schwerpunktsebene an. Die Zentriersicke 7 wiederum hat die Aufgabe, den Schwingkopf (Schwingspule 8, Spulenträger 8a und Adapter 9) am Magnetsystem zu fixieren (für Axialbewegung weich federnd, für Radial- und Kippbewegungen hart federnd). Die Zentriersicke 7 könnte sich aber auch vom Außenrand des Schwingkopfes weiter nach außen oder weiter nach innen erstrecken. Bei andersartiger Halterung könnte sie auch ganz entfallen.The load bead 2 has the task of the magnet system (magnetic pot 4, permanent magnet 5 and pole disc 6) on the plate membrane 12 to fix (for axial movement soft spring, for radial and Tilting movements hard resilient). The load bead 2 could also extend further outwards from the outer edge of the magnet system or further inside. But you could also with one other types of bracket are completely eliminated. To avoid of static tipping moments engages the load bead 2 in the Center of gravity. The centering bead 7 in turn has Task, the oscillating head (voice coil 8, coil support 8a and Fix adapter 9) to the magnet system (for axial movement soft resilient, hard resilient for radial and tilting movements). The centering bead 7 could also be from the outer edge of the Extend the oscillating head further outwards or further inwards. With a different type of holder, it could also be whole omitted.

Bei dem beschriebenen Ausführungsbeispiel besteht die Lastsicke 2 aus einem selbständigen Bauteil. Sie kann jedoch auch Teil des Gehäuses 3 selbst sein, wenn dieses aus Compound-Material besteht, bei welchem das das Magnetsystem aufnehmende Gehäuseteil hart ausgebildet und das Lastsickenteil zum Zwecke der Abfederung aus weicherem Material besteht. In the described embodiment there is the load bead 2 from an independent component. However, it can also Be part of the housing 3 itself, if this is made of compound material exists in which the receiving the magnet system Housing part hard and the load bead part to For the purpose of cushioning is made of softer material.

Bei einem derartigen Aufbau ergeben sich verschiedene Hohlräume, deren Volumina sich beim Betrieb des Treibers entsprechend vergrößern und verkleinern. Die in den Hohlräumen mehr oder weniger dicht eingeschlossene Luft wird dann entsprechend komprimiert oder expandiert. Es ergibt sich dann eine zusätzliche Federwirkung, die insbesondere abhängig ist vom Volumen und der Dichtheit des Hohlraums. Die Eigenschaften der zusätzlichen Feder lassen sich aber nur schwer konstant halten und variieren von Exemplar zu Exemplar und unter verschiedenen Betriebsbedingungen. Erfindungsgemäß wird daher bei den Hohlräumen des Ausführungsbeispiels für einen Druckausgleich gesorgt, der für einen schnellen Luftaustausch in beide Richtungen sorgt, so daß keine Federwirkung entsteht.With such a structure there are different cavities, the volumes of which change accordingly when the driver is in operation zoom in and out. The more in the cavities or less tightly enclosed air will then become appropriate compressed or expanded. Then there is one additional spring action, which is particularly dependent on Volume and tightness of the cavity. The properties the additional spring is difficult to keep constant hold and vary from specimen to specimen and among different Operating conditions. According to the invention in the cavities of the embodiment for pressure equalization provided for a quick air exchange in ensures both directions so that there is no spring action.

Beim Ausführungsbeispiel wird einer der Hohlräume - im weiteren Sickenkammer 17 genannt - durch die Plattenmembran 12, den Adapter 9, die Zentriersicke 7, das Gehäuse 3 und die Lastsicke 2 begrenzt. Ein anderer Hohlraum (Gehäusekammer 11) wird durch das Gehäuse 3, die Zentriersicke 7, den Adapter 3, die Schwingspule 8 mit Spulenhalter 8a sowie den Luftspalt 18 definiert. Weiterhin werden ein Magnetkammer 10 genannter Hohlraum durch den Magnettopf 4, den Permanentmagneten 5, die Polscheibe 6, die Schwingspule 8 mit Spulenträger 8a sowie dem Luftspalt 18 umschlossen und ein Polkammer 13 genannter Hohlraum durch Adapter 9, den Spulenhalter 8a sowie die Polscheibe 6 festgelegt, wobei beim Ausführungsbeispiel die axiale Höhe hp der Polkammer 13 vorteilhafterweise geringer ist als die freie Höhe hm in der Magnetkammer 10. Ein weiterer Hohlraum (Adapterkammer 15) wird schließlich vom Adapter 9 in Verbindung mit der Plattenmembran 12 gebildet.In the exemplary embodiment, one of the cavities - hereinafter Called crimp chamber 17 - through the plate membrane 12, the adapter 9, the centering bead 7, the housing 3 and the Load bead 2 limited. Another cavity (housing chamber 11) is through the housing 3, the centering bead 7, the adapter 3, the voice coil 8 with the coil holder 8a and the air gap 18 Are defined. Furthermore, a magnetic chamber 10 are mentioned Cavity through the magnetic pot 4, the permanent magnet 5, the Pole disk 6, the voice coil 8 with coil carrier 8a and enclosed the air gap 18 and a pole chamber 13 called Cavity through adapter 9, the coil holder 8a and the pole disc 6 fixed, wherein in the embodiment axial height hp of the pole chamber 13 advantageously less is as the free height hm in the magnetic chamber 10. Another Cavity (adapter chamber 15) is finally from the adapter 9 formed in connection with the plate membrane 12.

Zum Druckausgleich der Sickenkammer 17 wurde beim Ausführungsbeispiel erfindungsgemäß die Lastsicke 2 mit einer Perforation versehen, durch deren Druckausgleichsöffnungen 19 ein Luftaustausch mit der Außenluft stattfinden kann, wodurch der gleiche Druck in der Sickenkammer 17 wie an der Außenluft erzielt wird. Von der Sickenkammer 17 aus erfolgt ein Druckausgleich der Gehäusekammer 11 und der Adapterkammer 15. Dazu ist die Zentriersicke 7 aus luftdurchlässigem Material, beispielsweise aus grobporigem elastischem Gewebe hergestellt, das eine Vielzahl kleiner Druckausgleichsöffnungen 20 aufweist. Der Adapter 9 weist eine Bohrung auf, die von der Sickenkammer 17 zur Adapterkammer 15 führt und als Druckausgleichsöffnung 16 zwischen diesen beiden Kammern dient. Darüber hinaus ist zwischen Adapterkammer 15 und Polkammer 13 eine Druckausgleichsöffnung 14 vorgesehen, wobei die Polkammer 13 auch mit der Gehäusekammer 11 über eine als Druckausgleichsöffnung 21 dienende Bohrung in dem Spulenhalter 8a verbunden ist. Da der Luftspalt 18 in der Regel einen zu kleinen effektiven Querschnitt für einen Druckausgleich hat, ist eine als Druckausgleichsöffnung 24 vorgesehene Bohrung in den Magnettopf 4 eingebracht derart, daß diese die Magnetkammer 10 mit der Außenluft verbindet. Damit stehen zwei Hohlräume unmittelbar mit der Außenluft in Verbindung, während die übrigen Hohlräume mittelbar zumindest über diese beiden und gegebenenfalls noch weitere Hohlräume ebenfalls mit der Außenluft Kontakt haben. Damit ist sichergestellt, daß in sämtlichen Hohlräumen immer Außendruck herrscht.For pressure equalization of the crimp chamber 17 was in the embodiment According to the invention, the load bead 2 with a perforation provided, through their pressure equalization openings 19th an air exchange with the outside air can take place, whereby the same pressure in the crimp chamber 17 as in the outside air is achieved. Pressure compensation takes place from the crimp chamber 17 the housing chamber 11 and the adapter chamber 15 is the centering bead 7 made of air-permeable material, for example made from coarse-pored elastic fabric, which has a plurality of small pressure equalization openings 20. The adapter 9 has a bore that extends from the bead chamber 17 leads to the adapter chamber 15 and as a pressure compensation opening 16 serves between these two chambers. About that is also between adapter chamber 15 and pole chamber 13 a pressure equalization opening 14 is provided, the pole chamber 13 also with the housing chamber 11 via a pressure equalization opening 21 serving bore in the coil holder 8a connected is. Since the air gap 18 usually one too has a small effective cross section for pressure equalization, is a bore provided as a pressure compensation opening 24 in the magnetic pot 4 introduced such that this the magnetic chamber 10 connects to the outside air. This creates two cavities directly in contact with the outside air while the remaining cavities indirectly at least through these two and possibly also further cavities also with the Outside air contact. This ensures that in there is always external pressure in all cavities.

Derartige Druckausgleichsöffnungen sind insbesondere auch vorteilhaft, ja sogar notwendig, wenn im Luftspalt Ferrofluid verwendet wird, was den Druckausgleich verhindern würde.Such pressure equalization openings are in particular also advantageous, even necessary if ferrofluid is in the air gap is used, which would prevent pressure equalization.

Anstelle der beschriebenen Druckausgleichsöffnungen und Hohlräume können auch Bohrungen oder sonstige Aussparungen im Gehäuse, in der Membran oder der Polscheibe vorgesehen sein. Auch diese Bohrungen und Aussparungen dienen, wie einleitend bereits erwähnt der Kühlung des Gehäuseinneren.Instead of the described pressure equalization openings and cavities can also have holes or other recesses in the housing, be provided in the membrane or the pole disk. These holes and recesses also serve as an introduction already mentioned the cooling of the interior of the housing.

Gegenüber der in Figur 1 gezeigten Ausführungsform ist die Ausführungsform nach Figur 2 dahingehend abgeändert, daß Gehäuse 3, Zentriersicke 7 und Lastsicke 2 aus Figur 1 entfallen. Außerdem ist die Polscheibe 6 beim Ausführungsbeispiel nach Figur 2 im Querschnitt t-förmig ausgebildet und steht in Kontakt mit einer kombinierten Zentner- und Lastsicke 23, in die ein Adapter-Fußteil 23a, ein Adapter-Kopfteil 23c und ein dazwischen liegender flexibler Adapter-Zwischenring 23c eingearbeitet sind. Der Adapter mit Adapter-Fußteil 23a, Adapter-Kopfteil 23c und Adapter-Zwischenring 23c dienen zur Befestigung des Treibers an der Klangplatte 12.Compared to the embodiment shown in FIG Embodiment according to Figure 2 modified so that the housing 3, centering bead 7 and load bead 2 from Figure 1 are omitted. In addition, the pole disk 6 is in the embodiment 2 is T-shaped in cross section and is shown in FIG Contact with a combined weight and load bead 23, in which is an adapter foot 23a, an adapter head 23c and a intervening flexible adapter intermediate ring 23c incorporated are. The adapter with adapter foot 23a, adapter head part 23c and adapter intermediate ring 23c are used for fastening the driver on the sound plate 12.

Hohlräume bilden sich bei dieser Ausführungsform insbesondere im Inneren des Adapters (Adapterkammer 15), zwischen Adapter, Schwingspule 8 und Polscheibe 6 (Polkammer 13) sowie zwischen Polscheibe 6, Permanentmagnet 5 und Magnettopf 4 (Magnetkammer 10). Durch eine Druckausgleichsöffnung 14 sind Adapterkammer 15 und Polkammer 13 miteinander verbunden, wobei die Adapterkammer 15 über eine Druckausgleichsöffnung bei 16 mit der Außenluft in Kontakt steht. Der Druckausgleich der Magnetkammer 10 erfolgt außer dem Luftspalt 18 auch mittels einer durch eine Bohrung im Magnettopf gebildete Druckausgleichsöffnung 24, Schließlich könnte optional - wie beim Ausführungsbeispiel nach Figur 1 - zudem eine Bohrung durch den Spulenkörper 8a als Druckausgleichsöffnung 21 vorgesehen werden (in Figur 2 nicht gezeigt).Cavities are formed in particular in this embodiment inside the adapter (adapter chamber 15), between adapter, Voice coil 8 and pole disc 6 (pole chamber 13) and between Pole disk 6, permanent magnet 5 and magnetic pot 4 (magnetic chamber 10). Through a pressure equalization opening 14 there are adapter chambers 15 and pole chamber 13 connected to each other, wherein the adapter chamber 15 via a pressure equalization opening at 16 is in contact with the outside air. The pressure equalization of the In addition to the air gap 18, the magnetic chamber 10 also takes place by means of a pressure compensation opening formed by a hole in the magnetic pot 24, Finally, could be optional - as with Embodiment according to Figure 1 - also through a hole the coil former 8a is provided as a pressure compensation opening 21 are (not shown in Figure 2).

Claims (12)

Elektrodynamischer Treiber für eine Membran (12) mit einer auf einem rohrförmigen Spulenträger (8a) aufgebrachten Schwingspule (8), einem bezüglich der Schwingspule (8) konzentrisch angeordneten, axial beweglichen Magnetsystem (4, 5, 6), einem Adapter (9) zum Befestigen des Spulenträgers (8a) an der Membran (12), einem zwischen Membran (12) und Magnetsystem (4, 5, 6) angeordneten elastischen Element (2, 7, 23b), wobei sich mindestens ein Hohlraum (10, 11, 15, 17) zwischen Membran (12) und Magnetsystem (4, 5, 6) bildet, gekennzeichnet durch Mittel zum Druckausgleich (14, 16, 19, 20, 21, 24) des mindestens einen Hohlraums (10, 11, 15, 17).Electrodynamic driver for a membrane (12) with a voice coil (8) mounted on a tubular coil support (8a), an axially movable magnet system (4, 5, 6) concentrically arranged with respect to the voice coil (8), an adapter (9) for Fastening the coil carrier (8a) to the membrane (12), an elastic element (2, 7, 23b) arranged between the membrane (12) and the magnet system (4, 5, 6), at least one cavity (10, 11, 15 , 17) between membrane (12) and magnet system (4, 5, 6), characterized by means for pressure equalization (14, 16, 19, 20, 21, 24) of the at least one cavity (10, 11, 15, 17) . Elektrodynamischer Treiber nach Anspruch 1, dadurch gekennzeichnet, daß zum Druckausgleich ein Element (7) aus luftdurchlässigem Material vorgesehen ist, das mit der Außenluft in Kontakt steht.Electrodynamic driver according to claim 1, characterized in that an element (7) for pressure equalization air-permeable material is provided, which with the outside air is in contact. Elektrodynamischer Treiber nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß mindestens ein Druckausgleichskanal (24, 16) vorgesehen ist, der vom Hohlraum (10, 14) zur Außenluft führen.Electrodynamic driver according to claim 1 or 2, characterized characterized in that at least one pressure compensation channel (24, 16) is provided, from the cavity (10, 14) to the outside air to lead. Elektrodynamischer Treiber nach Anspruch 1, 2 oder 3, dadurch gekennzeichnet, daß mindestens ein Hohlraum (17) eine Druckausgleichsöffnung (19) zur Außenluft aufweist. Electrodynamic driver according to claim 1, 2 or 3, characterized characterized in that at least one cavity (17) is a Has pressure equalization opening (19) to the outside air. Elektrodynamischer Treiber nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß sich mehrere Hohlräume (10, 11, 15, 17) bilden und daß Mittel zum Druckausgleich (16, 18, 20, 21) zwischen mindestens zwei Hohlräumen (10, 11, 15, 17) vorgesehen sind.Electrodynamic driver according to one of claims 1 to 4, characterized in that several cavities (10, 11, 15, 17) and that means for pressure compensation (16, 18, 20, 21) between at least two cavities (10, 11, 15, 17) are provided. Elektrodynamischer Treiber nach Anspruch 5, dadurch gekennzeichnet, daß mindestens zwei Hohlräume (11, 17) über ein luftdurchlässiges Element (7) miteinander verbunden sind.Electrodynamic driver according to claim 5, characterized in that at least two cavities (11, 17) over a air-permeable element (7) are interconnected. Elektrodynamischer Treiber nach Anspruch 5 oder 6, dadurch gekennzeichnet, daß mindestens ein Druckausgleichskanal (16) mindestens zwei Hohlräume (15, 17) miteinander verbindet.Electrodynamic driver according to claim 5 or 6, characterized characterized in that at least one pressure compensation channel (16) connects at least two cavities (15, 17). Elektrodynamischer Treiber nach einem der Ansprüche 5 bis 7, dadurch gekennzeichnet, daß mindestens zwei Hohlräume (13, 15) eine gemeinsame Druckausgleichsöffnung (14) aufweisen.Electrodynamic driver according to one of claims 5 to 7, characterized in that at least two cavities (13, 15) have a common pressure compensation opening (14). Elektrodynamischer Treiber nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, daß das elastische Element (2, 7) mindestens eine Druckausgleichsöffnung (19) aufweist und/oder luftdurchlässig (20) ist.Electrodynamic driver according to one of the preceding claims, characterized in that the elastic element (2, 7) has at least one pressure compensation opening (19) and / or is air permeable (20). Elektrodynamischer Treiber nach Anspruch 9, dadurch gekennzeichnet, daß als elastisches Element eine umlaufende Sicke (2, 7) vorgesehen ist, die mindestens eine Druckausgleichsöffnung (19) aufweist und/oder luftdurchlässig (20) ist.Electrodynamic driver according to claim 9, characterized in that as a circumferential elastic element Bead (2, 7) is provided, the at least one pressure compensation opening (19) and / or air-permeable (20) is. Elektrodynamischer Treiber nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, daß das Magnetsystem (4, 5, 6) mindestens eine Druckausgleichsöffnung (18) und/oder mindestens einen Druckausgleichskanal (10) aufweist.Electrodynamic driver according to one of the preceding claims, characterized in that the magnet system (4, 5, 6) at least one pressure compensation opening (18) and / or at least has a pressure equalization channel (10). Elektrodynamischer Treiber nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, daß der Adapter (9) mindestens eine Druckausgleichsöffnung (14) und/oder mindestens einen Druckausgleichskanal (16) aufweist.Electrodynamic driver according to one of the preceding claims, characterized in that the adapter (9) at least a pressure compensation opening (14) and / or at least has a pressure equalization channel (16).
EP00118512A 1999-08-27 2000-08-25 Electrodynamic driver Expired - Lifetime EP1079664B1 (en)

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DE19940930A DE19940930A1 (en) 1999-08-27 1999-08-27 Electrodynamic driver
DE19940930 1999-08-27

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Also Published As

Publication number Publication date
EP1079664B1 (en) 2011-10-19
EP1079664A3 (en) 2007-03-07
ATE530030T1 (en) 2011-11-15
DE19940930A1 (en) 2001-03-29

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