EP0914020B1 - Loudspeaker - Google Patents

Loudspeaker Download PDF

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Publication number
EP0914020B1
EP0914020B1 EP98119683A EP98119683A EP0914020B1 EP 0914020 B1 EP0914020 B1 EP 0914020B1 EP 98119683 A EP98119683 A EP 98119683A EP 98119683 A EP98119683 A EP 98119683A EP 0914020 B1 EP0914020 B1 EP 0914020B1
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EP
European Patent Office
Prior art keywords
flat membrane
loudspeaker
centering
support means
drive system
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
EP98119683A
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German (de)
French (fr)
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EP0914020A2 (en
EP0914020A3 (en
Inventor
Leonhard Kreitmeier
Berhard Puls
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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 EP0914020A2 publication Critical patent/EP0914020A2/en
Publication of EP0914020A3 publication Critical patent/EP0914020A3/en
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R7/00Diaphragms for electromechanical transducers; Cones
    • H04R7/02Diaphragms for electromechanical transducers; Cones characterised by the construction
    • H04R7/04Plane diaphragms
    • H04R7/06Plane diaphragms comprising a plurality of sections or layers
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R9/00Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/06Loudspeakers
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R9/00Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/02Details
    • H04R9/04Construction, mounting, or centering of coil
    • H04R9/041Centering

Definitions

  • Loudspeakers with flat membranes are generally constructed so that a drive system is connected to a loudspeaker basket.
  • the flat membrane In the speaker basket, the flat membrane is arranged at an axial distance to the drive system.
  • the drive system facing side of the flat membrane is provided with a push rod which extends in the direction of the drive system. If such a trained speaker with low-pitched sound signals of a sound signal source acted upon, these are transformed by the drive system acting on the push rod and thus also on the flat membrane strokes, whereby the flat membrane is placed according to the supplied audio signals in a sound event reproducing vibrations.
  • the flat membrane offset in vibrations along the loudspeaker central axis retains its centricity to the loudspeaker central axis in each oscillation state, it is fastened with elastic centering means by at least the edge of the flat membrane being connected to the loudspeaker basket by means of a so-called bead. If it were left alone in this type of centering, it would have to be designed to achieve adequate guidance of the flat membrane "very hard.” But since a hard design of the bead considerably limits the scope of such speakers, it has gone on, especially in woofer to further centering provided, for example, in the in the US 4,567,327 and the JP 57-083995 described speakers is the case.
  • the invention has for its object to provide a speaker with flat membrane, which has a reduced depth despite the presence of axially spaced centering.
  • the side facing the drive system of the flat membrane is provided with support means which extend in the direction of the drive system, and the flat membrane opposite ends of the support means are provided with centering (centering), so that the already existing space, which laterally (radially) to the drive system connects, can be used for centering, without an increase in the depth of the speaker is necessary to maintain the axial distance bid between bead and centering diaphragm.
  • the flat membrane is made in one piece with the support means made of foamed plastic material, so that the structure of inventive loudspeakers is particularly simple.
  • the use of foamed plastic material has the advantage that the additional weight of the support means increases the oscillating mass of the speaker only slightly.
  • FIG. 4 shows a loudspeaker 10 with a flat membrane 11 according to the prior art.
  • This speaker 10 is essentially formed by a drive system 12, a loudspeaker frame 13 and said flat membrane 11, which is arranged at an axial distance from the drive system 12 in the loudspeaker frame 13.
  • the drive system 12 is presently formed by a yoke assembly 12.1 and a permanent magnet 12.2, wherein an air gap 14 remains in the drive system 12, in which a voice coil 15 is immersed. If the voice coil 15 with low-pitched sound signals of a sound signal source applied (all not shown), the voice coil 15 moves in the direction of the loudspeaker center axis 16. This movement of the voice coil 15, since the voice coil 15 via a push rod 17 (also called voice coil bobbin) with the Drive system 12 facing side of the flat membrane 11 is connected to the flat membrane 11 transmitted.
  • a push rod 17 also called voice coil bobbin
  • centering means 18 are provided.
  • the first centering means 18.1 which is also referred to as a bead, connects the edge of the flat membrane 11 to the loudspeaker frame 13.
  • the second centering means 18.2 in the form of the so-called centering membrane surrounds the voice coil former 17 without spacing and is likewise connected to the loudspeaker frame 13. It is noticeable in this type of arrangement that between the first centering means 18.1 and the centering diaphragm 18.2 there is a distance A in the direction of the loudspeaker central axis 16.
  • This distance A is necessary in order to tilt the voice coil carrier 17, which is also referred to as wobbling, during the movement of the voice coil carrier 17 in the direction of the loudspeaker center axis 16 excluded.
  • Larger distances A than those shown in FIG. 1 reduce the tendency to tumble but cause the depth T of the loudspeaker 10 to increase even further.
  • the distance A can be reduced at the expense of a smaller stroke of the loudspeaker 10, since at a smaller stroke of the flat membrane 11 in the direction the speaker center axis 16, a tumbling of the voice coil bobbin 17 is not so strong in appearance.
  • a reduced stroke causes such speakers 10 are unusable for the bass reproduction.
  • the centering membrane 18.2 fills a part of the distance A1 between the flat membrane 11 and the drive system 12 by its wavy structure with the height H. Regardless of the requirement that the distance A between the two centering means 18.1 and 18.2 for the bass reproduction should be as large as possible, the height H of the centering diaphragm 18.2 inevitably leads to an increase in the distance A1 and thus also the depth T of the loudspeaker 10th
  • the loudspeaker 10 is formed by a drive system 12 and a loudspeaker basket 13.
  • the flat membrane 12 is inserted into the loudspeaker frame 13 at an axial distance from the drive system 12.
  • the outer edge of the flat membrane 12 is by means of the bead 18.1 with the Loudspeaker basket 13 connected.
  • the drive system 12 facing side of the flat membrane 11 is provided with a support means 19 which has a trapezoidal cross section and which extends in the direction of the drive system 12.
  • the flat membrane 12 facing away from the end 20 of the support means 19 is connected to the centering diaphragm 18.2, wherein the centering diaphragm 18.2 extends away from the drive system 12 and is connected at its other end to the loudspeaker frame 13.
  • the embodiment according to FIG. 2 differs from the embodiment according to FIG. 1 in that the centering diaphragm 18.2 connected to the support means 19 extends in the direction of the drive system 12.
  • the centering diaphragm 18.2 in FIG. 2 is connected to the loudspeaker basket 13, in another embodiment (not shown) the toe ring diaphragm 18.2 can also be connected directly to the drive system 121.
  • the flat membrane 11 and the support means 19 is integrally formed of foamed plastic material in the embodiment of Figure 2.

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

Description

Stand der TechnikState of the art

Lautsprecher mit Flachmembranen sind allgemein so aufgebaut, daß ein Antriebssystem mit einem Lautsprecherkorb verbunden ist. In dem Lautsprecherkorb ist die Flachmembran mit axialem Abstand zum Antriebssystem eingeordnet. Die dem Antriebssystem zugewandte Seite der Flachmembran ist mit einer Schubstange versehen, welche sich in Richtung des Antriebssystems erstreckt. Wird ein derart ausgebildeter Lautsprecher mit niederfrequenten Tonsignalen einer Tonsignalquelle beaufschlagt, werden diese vom Antriebssystem in auf die Schubstange und damit auch auf die Flachmembran wirkende Hubbewegungen umgeformt, womit die Flachmembran entsprechend der zugeführten Tonsignale in ein Schallereignis wiedergebende Schwingungen versetzt wird.Loudspeakers with flat membranes are generally constructed so that a drive system is connected to a loudspeaker basket. In the speaker basket, the flat membrane is arranged at an axial distance to the drive system. The drive system facing side of the flat membrane is provided with a push rod which extends in the direction of the drive system. If such a trained speaker with low-pitched sound signals of a sound signal source acted upon, these are transformed by the drive system acting on the push rod and thus also on the flat membrane strokes, whereby the flat membrane is placed according to the supplied audio signals in a sound event reproducing vibrations.

Damit die in Schwingungen längs der Lautsprechermittelachse versetzte Flachmembran in jedem Schwingungszustand ihre Zentrizität zur Lautsprechermittelachse behält, ist diese mit elastischen Zentriermitteln befestigt, indem zumindest der Rand der Flachmembran mit dem Lautsprecherkorb mittels einer sogenannten Sicke verbunden ist. Würde man es allein bei dieser Art der Zentrierung belassen, müßte diese zur Erreichung einer ausreichenden Führung der Flachmembran sehr hart" ausgelegt werden. Da aber eine harte Auslegung der Sicke den Anwendungsbereich derartiger Lautsprecher erheblich einschränkt, ist man insbesondere bei Tieftonlautsprecher dazu übergegangen, weitere Zentriermittel vorzusehen, wie dies beispielsweise bei den in der US 4,567,327 und der JP 57-083995 beschriebenen Lautsprechern der Fall ist. Diese weiteren Zentriermittel, welche auch als Zentrierspinnen oder Zentriermembranen bekannt sind, werden gemäß dem Stand der Technik bei Lautsprechern mit Flachmembranen radial zur Lautsprechermittelachse zwischen der Schubstange und dem Lautsprecherkorb angeordnet. Damit diese zusätzlichen Zentriermittel aber wirkungsvoll arbeiten, ist ein axialer Abstand zwischen der Sicke und der Zentriermembran notwendig. Um dies zu realisieren, muß der axiale Abstand der Flachmembran zumIn order that the flat membrane offset in vibrations along the loudspeaker central axis retains its centricity to the loudspeaker central axis in each oscillation state, it is fastened with elastic centering means by at least the edge of the flat membrane being connected to the loudspeaker basket by means of a so-called bead. If it were left alone in this type of centering, it would have to be designed to achieve adequate guidance of the flat membrane "very hard." But since a hard design of the bead considerably limits the scope of such speakers, it has gone on, especially in woofer to further centering provided, for example, in the in the US 4,567,327 and the JP 57-083995 described speakers is the case. These further centering means, which are also known as centering or centering, are arranged according to the prior art in speakers with flat membranes radially to the loudspeaker center axis between the push rod and the loudspeaker frame. In order for these additional centering but effective work, an axial distance between the bead and the centering diaphragm is necessary. To realize this, the axial distance of the flat membrane for

Antriebssystem bzw. die Länge der Schubstange vergrößert werden, damit ein möglichst großer Abstand zwischen den beiden Zentriermitteln verbleibt. Diese Abstandsvergrößerung führt aber unweigerlich auch zu einer Vergrößerung der Tiefe des Lautsprechers insgesamt.Drive system or the length of the push rod can be increased so that the largest possible distance between the two centering remains. However, this increase in distance inevitably leads to an increase in the depth of the speaker as a whole.

Daher liegt der Erfindung die Aufgabe zugrunde, einen Lautsprecher mit Flachmembran anzugeben, welcher trotz des Vorhandenseins von in axialem Abstand zueinander angeordneten Zentriermitteln eine verminderte Bautiefe aufweist.Therefore, the invention has for its object to provide a speaker with flat membrane, which has a reduced depth despite the presence of axially spaced centering.

Darstellung der ErfindungPresentation of the invention

Diese Aufgabe wird mit den in Anspruch 1 angegebenen Merkmalen gelöst. Eine vorteilhafte Aus- und Weiterbildung der Erfindung ist dem Anspruch 2 entnehmbar.This object is achieved with the features specified in claim 1. An advantageous development and development of the invention is the claim 2 removable.

Die dem Antriebssystem zugewandte Seite der Flachmembran ist mit Stütz-mitteln versehen, die sich in Richtung des Antriebssystems erstrecken, und die der Flachmembran abgewandten Enden der Stützmittel sind mit Zentriermitteln (Zentriermembran) versehen, sodass der ohnehin vorhandene Raum, welcher seitlich (radial) an das Antriebssystem anschließt, zur Zentrierung genutzt werden kann, ohne daß für die Wahrung des axialen Abstandsgebots zwischen Sicke und Zentriermembran eine Vergrößerung der Tiefe des Lautsprechers notwendig wird.The side facing the drive system of the flat membrane is provided with support means which extend in the direction of the drive system, and the flat membrane opposite ends of the support means are provided with centering (centering), so that the already existing space, which laterally (radially) to the drive system connects, can be used for centering, without an increase in the depth of the speaker is necessary to maintain the axial distance bid between bead and centering diaphragm.

Beträgt gemäß Anspruch 2 der radiale Abstand, den die von den Flachmembranen abgewandten Enden der Stützmittel zur Lautsprecherachse haben, wenigstens ¾ des Abstandes zwischen der Lautsprechermittelachse und dem äußeren Rand der Flachmembran, wird ein besonders guter Taumelschutz der Flachmembran erreicht.According to claim 2, the radial distance which the ends of the support means facing away from the flat membranes to the loudspeaker axis, at least ¾ of the distance between the loudspeaker central axis and the outer edge of the flat membrane, a particularly good Taumelschutz the flat membrane is achieved.

Die Flachmembran ist zusammen mit den Stützmitteln einstückig aus geschäumtem Kunststoffmaterial hergestellt, sodass der Aufbau von erfindungs-gemäßen Lautsprechern besonders einfach ist. Außerdem hat die Verwendung von geschäumtem Kunststoffmaterial den Vorteil, daß das zusätzliche Gewicht der Stützmittel die schwingende Masse des Lautsprechers nur unwesentlich erhöht.The flat membrane is made in one piece with the support means made of foamed plastic material, so that the structure of inventive loudspeakers is particularly simple. In addition, the use of foamed plastic material has the advantage that the additional weight of the support means increases the oscillating mass of the speaker only slightly.

Kurze Darstellung der FigurenShort illustration of the figures

Es zeigen:

Figur 1
einen Lautsprecher im Schnitt;
Figur 2
eine weitere Darstellung gemäß Figur 1;
Figur 3
einen weiteren Lautsprecher im Schnitt; und
Figur 4
einen Lautsprecher gemäß dem Stand der Technik.
Show it:
FIG. 1
a speaker in section;
FIG. 2
a further illustration of Figure 1;
FIG. 3
another speaker in section; and
FIG. 4
a speaker according to the prior art.

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.

In Figur 4 ist ein Lautsprecher 10 mit einer Flachmembran 11 gemäß dem Stand der Technik gezeigt. Dieser Lautsprecher 10 wird im wesentlichen von einem Antriebssystem 12, einem Lautsprecherkorb 13 und der besagten Flachmembran 11 gebildet, welche mit axialem Abstand zum Antriebssystem 12 im Lautsprecherkorb 13 angeordnet ist. Das Antriebssystem 12 wird vorliegend von einer Rückschlußanordnung 12.1 und einem Dauermagneten 12.2 gebildet, wobei ein Luftspalt 14 im Antriebssystem 12 verbleibt, in welche eine Schwingspule 15 eintaucht. Wird die Schwingspule 15 mit niederfrequenten Tonsignalen einer Tonsignalquelle beaufschlagt (alles nicht gezeigt), bewegt sich die Schwingspule 15 in Richtung der Lautsprechermittelachse 16. Diese Bewegung der Schwingspule 15 wird, da die Schwingspule 15 über eine Schubstange 17 (auch Schwingspulenträger genannt) mit der dem Antriebssystem 12 zugewandten Seite der Flachmembran 11 verbunden ist, auf die Flachmembran 11 übertragen.FIG. 4 shows a loudspeaker 10 with a flat membrane 11 according to the prior art. This speaker 10 is essentially formed by a drive system 12, a loudspeaker frame 13 and said flat membrane 11, which is arranged at an axial distance from the drive system 12 in the loudspeaker frame 13. The drive system 12 is presently formed by a yoke assembly 12.1 and a permanent magnet 12.2, wherein an air gap 14 remains in the drive system 12, in which a voice coil 15 is immersed. If the voice coil 15 with low-pitched sound signals of a sound signal source applied (all not shown), the voice coil 15 moves in the direction of the loudspeaker center axis 16. This movement of the voice coil 15, since the voice coil 15 via a push rod 17 (also called voice coil bobbin) with the Drive system 12 facing side of the flat membrane 11 is connected to the flat membrane 11 transmitted.

Damit die Flachmembran 11 bei ihrer Bewegung in Richtung der Lautsprechermittelachse 16 ihre Zentrizität zur Lautsprechermittelachse 16 beibehält, sind Zentriermittel 18 vorgesehen. Das erste Zentriermittel 18.1, welches auch als Sicke bezeichnet wird, verbindet den Rand der Flachmembran 11 mit dem Lautsprecherkorb 13. Das zweite Zentriermittel 18.2 in der Form der sogenannten Zentriermembran umrandet den Schwingspulenträger 17 abstandlos und ist ebenfalls mit dem Lautsprecherkorb 13 verbunden. Auffällig ist bei dieser Art der Anordnung, daß zwischen dem ersten Zentriermittel 18.1 und der Zentriermembran 18.2 ein Abstand A in Richtung der Lautsprechermittelachse 16 besteht. Dieser Abstand A ist notwendig, um ein Verkippen des Schwingspulenträgers 17, welches auch als Taumeln bezeichnet wird, während der Bewegung des Schwingspulenträgers 17 in Richtung der Lautsprechermittelachse 16 auszuschließen. Größere Abstände A als der, der in Figur 1 gezeigt ist, reduzieren zwar die Taumelneigung, führen aber dazu, daß sich die Tiefe T des Lautsprechers 10 noch weiter vergrößert. Kann die einen größeren Abstand A einschließende Tiefe T des Lautsprechers 10 jedoch aufgrund von Einbaumaßen für den Lautsprecher 10 nicht realisiert werden, kann nur der Abstand A zu Lasten eines geringeren Hubs des Lautsprechers 10 verkleinert werden, da bei einem geringeren Hub der Flachmembran 11 in Richtung der Lautsprechermittelachse 16 ein Taumeln des Schwingspulenträgers 17 nicht so stark in Erscheinung tritt. Ein verminderter Hub führt aber dazu, daß derartige Lautsprecher 10 für die Tieftonwiedergabe unbrauchbar werden.So that the flat membrane 11 maintains its centricity to the loudspeaker center axis 16 as it moves in the direction of the loudspeaker central axis 16, centering means 18 are provided. The first centering means 18.1, which is also referred to as a bead, connects the edge of the flat membrane 11 to the loudspeaker frame 13. The second centering means 18.2 in the form of the so-called centering membrane surrounds the voice coil former 17 without spacing and is likewise connected to the loudspeaker frame 13. It is noticeable in this type of arrangement that between the first centering means 18.1 and the centering diaphragm 18.2 there is a distance A in the direction of the loudspeaker central axis 16. This distance A is necessary in order to tilt the voice coil carrier 17, which is also referred to as wobbling, during the movement of the voice coil carrier 17 in the direction of the loudspeaker center axis 16 excluded. Larger distances A than those shown in FIG. 1 reduce the tendency to tumble but cause the depth T of the loudspeaker 10 to increase even further. However, if the depth T of the loudspeaker 10 enclosing a greater distance A can not be realized due to installation dimensions for the loudspeaker 10, only the distance A can be reduced at the expense of a smaller stroke of the loudspeaker 10, since at a smaller stroke of the flat membrane 11 in the direction the speaker center axis 16, a tumbling of the voice coil bobbin 17 is not so strong in appearance. However, a reduced stroke causes such speakers 10 are unusable for the bass reproduction.

Außerdem muß im Zusammenhang mit der Anordnung gemäß Figur 4 berücksichtigt werden, daß die Zentriermembran 18.2 durch ihre gewellte Struktur mit der Höhe H einen Teil des Abstands A1 zwischen der Flachmembran 11 und dem Antriebssystem 12 ausfüllt. Unabhängig von der Forderung, daß der Abstand A zwischen den beiden Zentriermitteln 18.1 und 18.2 für die Tieftonwiedergabe möglichst groß sein soll, führt die Höhe H der Zentriermembran 18.2 zwangsläufig zu einer Vergrößerung des Abstandes A1 und damit auch der Tiefe T des Lautsprechers 10.In addition, it must be taken into account in connection with the arrangement according to FIG. 4 that the centering membrane 18.2 fills a part of the distance A1 between the flat membrane 11 and the drive system 12 by its wavy structure with the height H. Regardless of the requirement that the distance A between the two centering means 18.1 and 18.2 for the bass reproduction should be as large as possible, the height H of the centering diaphragm 18.2 inevitably leads to an increase in the distance A1 and thus also the depth T of the loudspeaker 10th

Um dennoch die Forderung nach einer geringen Einbautiefe für einen Lautsprecher 10 mit der Anforderung nach einem großen Hub zu kombinieren, wurde gemäß der Erfindung die dem Antriebssystem 12 zugewandte Seite der Flachmembran 11 mit Stützmitteln 19 versehen, die sich in Richtung des Antriebssystems 12 erstrecken. Sind die der Flachmembran 11 abgewandten Enden 20 der Stützmittel 19 mit den Zentriermitteln 18.2 in der Form der Zentriermembran 18.2 verbunden, kann der Raum, welcher radial an das Antriebssystem 12 anschließt, zur Zentrierung genutzt werden, ohne daß für die Zentrierung mittels der Zentriermembran 18.2 die Tiefe des Lautsprechers 10 vergrößert werden muß. Die einzelnen Realisierungen gemäß der Erfindung sind den Figuren 1 - 3, welche allerdings keine maßstäblichen Wiedergaben zeigen, entnehmbar.In order nevertheless to combine the requirement for a small installation depth for a loudspeaker 10 with the requirement for a large stroke, according to the invention, the side of the flat membrane 11 facing the drive system 12 was provided with support means 19 which extend in the direction of the drive system 12. Are the flat membrane 11 opposite ends 20 of the support means 19 connected to the centering 18.2 in the form of the centering diaphragm 18.2, the space which connects radially to the drive system 12, can be used for centering, without for centering by means of the centering 18.2 the Depth of the speaker 10 must be increased. The individual implementations according to the invention are the figures 1-3, which, however, show no scale reproductions, removable.

Auch bei der Erfindung wird der Lautsprecher 10, von einem Antriebssystem 12 und einem Lautsprecherkorb 13 gebildet. Die Flachmembran 12 ist mit axialem Abstand zum Antriebssystem 12 in den Lautsprecherkorb 13 eingesetzt. Der äußere Rand der Flachmembran 12 ist mittels der Sicke 18.1 mit dem Lautsprecherkorb 13 verbunden. Die dem Antriebssystem 12 zugewandte Seite der Flachmembran 11 ist mit einem Stützmittel 19 versehen, welches einen trapezförmigen Querschnitt hat und welches sich in Richtung des Antriebssystems 12 erstreckt. Das der Flachmembran 12 abgewandte Ende 20 des Stützmittels 19 ist mit der Zentriermembran 18.2 verbunden, wobei sich die Zentriermembran 18.2 vom Antriebssystem 12 weg erstreckt und an ihrem anderen Ende mit dem Lautsprecherkorb 13 verbunden ist.Also in the invention, the loudspeaker 10 is formed by a drive system 12 and a loudspeaker basket 13. The flat membrane 12 is inserted into the loudspeaker frame 13 at an axial distance from the drive system 12. The outer edge of the flat membrane 12 is by means of the bead 18.1 with the Loudspeaker basket 13 connected. The drive system 12 facing side of the flat membrane 11 is provided with a support means 19 which has a trapezoidal cross section and which extends in the direction of the drive system 12. The flat membrane 12 facing away from the end 20 of the support means 19 is connected to the centering diaphragm 18.2, wherein the centering diaphragm 18.2 extends away from the drive system 12 and is connected at its other end to the loudspeaker frame 13.

Die Ausführung gemäß Figur 2 unterscheidet sich von der Ausführung gemäß Figur 1 dadurch, daß sich die mit dem Stützmittel 19 verbundene Zentriermembran 18.2 in Richtung des Antriebssystems 12 erstreckt. Auch wenn die Zentriermembran 18.2 in Figur 2 mit dem Lautsprecherkorb 13 verbunden ist, kann in einem anderen - nicht dargestellten - Ausführungsbeispiel die Zehtriermembran 18.2 auch direkt mit dem Antriebssystem 121 verbunden sein.The embodiment according to FIG. 2 differs from the embodiment according to FIG. 1 in that the centering diaphragm 18.2 connected to the support means 19 extends in the direction of the drive system 12. Although the centering diaphragm 18.2 in FIG. 2 is connected to the loudspeaker basket 13, in another embodiment (not shown) the toe ring diaphragm 18.2 can also be connected directly to the drive system 121.

Wie in der Ausführung gemäß Figur 1 ist auch in der Ausführung gemäß Figur 2 die Flachmembran 11 und das Stützmittel 19 einstückig aus geschäumtem Kunststoffmaterial gebildet.As in the embodiment of Figure 1, the flat membrane 11 and the support means 19 is integrally formed of foamed plastic material in the embodiment of Figure 2.

Um eine gute Zentrierwirkung der mit dem Stützmittel 19 verbundenen Zentriermembran 18.2 zu erzielen, erfüllen sämtliche in den Figuren 1 - 3 gezeigten Ausführungen die in Anspruch 3 angegebene Forderung, wonach der radiale Abstand, den die von der jeweiligen Flachmembran 11 abgewandten Enden 20 des jeweiligen Stützmittels 19 zur Lautsprechermittelachse 16 haben soll, wenigstens ¾ des Abstandes zwischen der Lautsprechermittelachse 16 und dem äußeren Rand der Flachmembran 11 beträgt.In order to achieve a good centering effect of the centering diaphragm 18.2 connected to the support means 19, all the embodiments shown in FIGS. 1-3 fulfill the requirement stated in claim 3, according to which the radial distance which the ends 20 of the respective support means remote from the respective flat membrane 11 19 to the loudspeaker center axis 16, at least ¾ of the distance between the loudspeaker central axis 16 and the outer edge of the flat membrane 11 is.

Die Ausführung gemäß Figur 3 unterscheidet sich von den Ausführungen der Figuren 1 und 2 dadurch, daß das Stützmittel 19 vom Verbindungsbereich 21 zwischen dem Schwingspulenträger 17 und der Flachmembran 11 ausgeht und von dort bogenförmig in den Bereich 22 geführt ist, welcher sich radial an das Antriebssystem 12 anschließt. Auch für diese Anordnung ist trotz der Führung der Stützmittel 19 zum Schwingspulenträger 17 kein zusätzlicher Abstand A1 (gemäß Figur 4) notwendig, weil die relativ geringe Dicke des bogenförmigen Stützmittels 19 vernachlässigt werden kann.The embodiment according to Figure 3 differs from the embodiments of Figures 1 and 2, characterized in that the support means 19 from the connecting portion 21 between the voice coil bobbin 17 and the flat membrane 11 and from there arcuately guided in the region 22, which is radially to the drive system 12 connects. Even for this arrangement, despite the leadership of the support means 19 to the voice coil bobbin 17 no additional distance A1 (according to Figure 4) is necessary because the relatively small thickness of the arcuate support means 19 can be neglected.

Claims (2)

  1. A loudspeaker including a driver system (12), a loud speaker enclosure (13), which is connected to the driver system (12), a flat membrane (11), which is disposed at an axial spacing from the driver system (12), a moving coil carrier (17), which is connected to the flat membrane (11), extending in the direction of the driver system (12) and centering means (18.1), which hold and guide the flat membrane (11) centrally with respect to the driver system (12), wherein connected to the side of the flat membrane (11) directed towards the driver system (12) there is support means (19), which extend in the direction of the driver system (12), and that the ends (20), directed away from the flat membrane (11), of the support means (19) are connected by means of centering means (18.2) to the loudspeaker enclosure (13) and/or the driver system (12), characterised in that the flat membrane (11) and the support means (19) are integrally formed of foamed plastic material.
  2. A loudspeaker as claimed in Claim 1, characterised in that the radial spacing, which the ends (20), directed away from the flat membrane (11), of the support means (19) have from the central axis (16) of the loudspeaker, is at least 3/4 of the spacing between the central axis (16) of the loudspeaker and the outer edge of the flat membrane (11).
EP98119683A 1997-10-30 1998-10-19 Loudspeaker Expired - Lifetime EP0914020B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE1997147955 DE19747955C2 (en) 1997-10-30 1997-10-30 speaker
DE19747955 1997-10-30

Publications (3)

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EP0914020A2 EP0914020A2 (en) 1999-05-06
EP0914020A3 EP0914020A3 (en) 2004-09-22
EP0914020B1 true EP0914020B1 (en) 2007-06-27

Family

ID=7847105

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98119683A Expired - Lifetime EP0914020B1 (en) 1997-10-30 1998-10-19 Loudspeaker

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EP (1) EP0914020B1 (en)
DE (2) DE19747955C2 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10120281C1 (en) 2001-04-25 2002-12-05 Harman Audio Electronic Sys speaker
CN1833464B (en) * 2003-08-08 2011-04-20 Pss比利时股份有限公司 Loudspeaker with undulated membrane
JP4639142B2 (en) 2005-11-21 2011-02-23 パイオニア株式会社 Speaker device
DE102012214263B4 (en) 2012-08-10 2019-01-24 Sennheiser Electronic Gmbh & Co. Kg Dynamic electroacoustic transducer
GB2542382A (en) * 2015-09-17 2017-03-22 Gp Acoustics (Uk) Ltd Low-profile loudspeaker

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Publication number Priority date Publication date Assignee Title
GB1510797A (en) * 1974-11-28 1978-05-17 Bertagni J Diaphragm for use in an electroacoustic transducer
US4184563A (en) * 1978-12-21 1980-01-22 Bertagni Jose J Planar diaphragm and supporting frame assembly
JPS5783995A (en) * 1980-11-11 1982-05-26 Matsushita Electric Ind Co Ltd Speaker
NL8200416A (en) * 1982-02-04 1983-09-01 Philips Nv FLAT MEMBRANE CONVERTER AND METHOD FOR MAKING SUCH A CONVERTER
DE3507726A1 (en) * 1985-03-05 1986-09-11 Standard Elektrik Lorenz Ag, 7000 Stuttgart MEMBRANE FOR PLANAR SPEAKER
DE3707741A1 (en) * 1987-03-11 1988-09-22 Blaupunkt Werke Gmbh SPEAKER
DE3733000A1 (en) * 1987-09-30 1989-04-13 Rainer Cornelius Friz Damping elements for multiway diaphragms
WO1995014296A1 (en) * 1993-11-18 1995-05-26 Sound Advance Systems, Inc. Improved planar diaphragm loudspeaker

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Title
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Also Published As

Publication number Publication date
EP0914020A2 (en) 1999-05-06
DE59814039D1 (en) 2007-08-09
DE19747955C2 (en) 2002-11-07
DE19747955A1 (en) 1999-05-06
EP0914020A3 (en) 2004-09-22

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