EP0297572A1 - Membrane for loudspeaker - Google Patents

Membrane for loudspeaker Download PDF

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Publication number
EP0297572A1
EP0297572A1 EP88110444A EP88110444A EP0297572A1 EP 0297572 A1 EP0297572 A1 EP 0297572A1 EP 88110444 A EP88110444 A EP 88110444A EP 88110444 A EP88110444 A EP 88110444A EP 0297572 A1 EP0297572 A1 EP 0297572A1
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EP
European Patent Office
Prior art keywords
membrane
film
bead
loudspeaker
approximately
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
EP88110444A
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German (de)
French (fr)
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EP0297572B1 (en
Inventor
Karl-Heinz Dipl.-Phys. Thiele
Jürgen Ehmann
Klaus Dipl.-Ing. Harbarth
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.)
Elektrotechnik Ehmann GmbH
EWD Electronic-Werke Deutschland GmbH
Original Assignee
Elektrotechnik Ehmann GmbH
EWD Electronic-Werke Deutschland GmbH
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Priority claimed from DE19873722832 external-priority patent/DE3722832A1/en
Application filed by Elektrotechnik Ehmann GmbH, EWD Electronic-Werke Deutschland GmbH filed Critical Elektrotechnik Ehmann GmbH
Priority to AT88110444T priority Critical patent/ATE63190T1/en
Publication of EP0297572A1 publication Critical patent/EP0297572A1/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • 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
    • H04R7/00—Diaphragms for electromechanical transducers; Cones
    • H04R7/02—Diaphragms for electromechanical transducers; Cones characterised by the construction
    • H04R7/12—Non-planar diaphragms or cones
    • H04R7/122—Non-planar diaphragms or cones comprising a plurality of sections or layers
    • H04R7/125—Non-planar diaphragms or cones comprising a plurality of sections or layers comprising a plurality of 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
    • H04R7/00—Diaphragms for electromechanical transducers; Cones
    • H04R7/26—Damping by means acting directly on free portion of diaphragm or cone
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2307/00—Details of diaphragms or cones for electromechanical transducers, their suspension or their manufacture covered by H04R7/00 or H04R31/003, not provided for in any of its subgroups
    • H04R2307/029—Diaphragms comprising fibres

Definitions

  • the membrane is connected at its rear end to a voice coil and via a centering membrane to the loudspeaker basket and at its front end via a bead to the basket of the loudspeaker.
  • the centering membrane and the bead cause the membrane to move as freely as possible in the axial direction of the loudspeaker to generate the sound pressure, but is guided in the radial direction of the loudspeaker, i.e. makes practically no movement in this direction or if possible.
  • the membrane must be connected to the bead at its front circumferential edge.
  • the sound quality of a loudspeaker depends, among other things, on the perfect functioning of the centering membrane and the bead, as well as on the behavior of the membrane itself.
  • the invention has for its object to design the membrane for a speaker so that on the one hand the effort for gluing the membrane to the bead is reduced and the sound quality of the speaker is increased.
  • the two films which together form the membrane therefore each perform different tasks.
  • the first film which is preferably made of polycarbonate and has a relatively high modulus of elasticity, takes on the task of stabilizing the membrane. It thus gives the membrane the one distortion-free reproduction necessary rigidity.
  • the second, laminated film is designed as a thermal polyurethane film and serves to dampen partial vibrations of the membrane. Compared to the first film, it has a much smaller modulus of elasticity.
  • the second, thermal film preferably also extends over the outer edge region of the membrane and can therefore also be used in an advantageous manner to simplify the gluing process of the bead with the membrane.
  • the thermal second film then serves in the area of the membrane for damping the partial vibrations and in the edge area additionally for a heat sealing process or a hot pressing process for fastening the bead to the membrane.
  • the membrane according to the invention is particularly suitable for a cone loudspeaker for a television receiver.
  • Fig. 1 shows a loudspeaker with the basket 1, the magnet 2, the voice coil 3, the centering membrane 4, the conical membrane 5 and the bead 6.
  • the centering membrane 4 and the bead 6 are each by a heat sealing process, a hot pressing process or by ultrasonic welding connected to the edge of the membrane 5.
  • the inner edge of the centering membrane 4 is connected to the voice coil 3 and the outer edge of the bead 6 to the basket 1.
  • Fig. 2 shows the structure of the membrane 5.
  • the membrane 5 consists of a first film 5a of relatively large thickness of about 250 microns made of polycarbonate with an elastic modulus of about 2x103 N / mm2.
  • the second film 5b is evaporated onto the front side, that is to say the surface of the film 5a pointing in the direction of sound emission.
  • the film 5b is a thermal polyurethane film with a thickness of approx. 50 ⁇ m and an elastic modulus of 10 ... 500 N / mm2.
  • the second film 5b essentially serves to dampen the partial vibrations of the membrane 5 in the upper edge region and at the same time to produce the adhesive process between the bead 6 and the membrane 5.
  • the starting material for the membrane i.e. 2, has a large curvature for a deep-drawing process and is therefore particularly suitable for cone membranes.
  • Fig. 1 it is assumed that the membrane 5 is connected to the bead 6.
  • This connection can preferably be made by a hot gluing process or a hot pressing process using the thermal layer 5b or by ultrasonic welding. Such a method is described in the earlier patent application P 36 20 889.2.
  • the membrane 5 can also be connected to the centering membrane 4.
  • the membrane 5 and bead 6 are made of the same continuous material and are produced in one operation by deep drawing from a large area material with the two foils 5a and 5b .
  • large panels with a width of approximately 1.2 m are included the two films 5a and 5b produced by lamination.
  • the film 5b which is generally thinner, can also be rolled onto the thicker film 5a. The relationship between the thickness D of the film 5a and the thickness d of the film 5b can influence the sound behavior of the loudspeaker provided with the membrane 5 as required.
  • the thickness D of the film 5a is, for example, 200 ⁇ m ⁇ 40 ⁇ m and the thickness d of the film 5b is 100 ⁇ m ⁇ 50 ⁇ m. In extreme cases, the thickness ratio D / d can also be on the order of 1.
  • the total thickness (D + d) in the area of the bead 6 can be smaller than in the area of the membrane 5, the thickness ratio D / d for membrane 5 and bead 6 preferably being the same.

Abstract

Eine Membran für einen Lautsprecher soll so ausgebildet werden, daß die Herstellung vereinfacht und der Klang des Lautsprechers verbessert wird. Die Membran (5) besteht aus einer ersten, zur Formstabilisierung dienenden Kunststoffolie (5a) und einer darauf kaschierten zweiten, zu Bedämpfung von Partialschwingungen dienenden Kunststoffolie (5b). Insbesondere für eine Konusmembran für einen Lautsprecher für einen Fernsehempfänger.A membrane for a loudspeaker should be designed so that the manufacture is simplified and the sound of the loudspeaker is improved. The membrane (5) consists of a first plastic film (5a) which serves to stabilize the shape and a second plastic film (5b) which is laminated thereon and which serves to dampen partial vibrations. In particular for a cone membrane for a loudspeaker for a television receiver.

Description

Bei einem Konuslautsprecher ist die Membran an ihrem rückwär­tigen Ende mit Schwingspule und über eine Zentriermem­bran mit dem Lautsprecherkorb und an ihrem vorderen Ende über eine Sicke mit dem Korb des Lautsprechers verbunden. Die Zentriermembran und die Sicke bewirken, daß die Membran sich in Axialrichtung des Lautsprechers zur Erzeugung des Schalldruckes möglichst ungehindert bewegen kann, jedoch in Radialrichtung des Lautsprechers geführt ist, d.h. in dieser Richtung praktisch oder möglichst keine Bewegung ausführt. Die Membran muß dabei an ihrem vorderen umlaufenden Rand mit der Sicke verbunden werden.In the case of a cone loudspeaker, the membrane is connected at its rear end to a voice coil and via a centering membrane to the loudspeaker basket and at its front end via a bead to the basket of the loudspeaker. The centering membrane and the bead cause the membrane to move as freely as possible in the axial direction of the loudspeaker to generate the sound pressure, but is guided in the radial direction of the loudspeaker, i.e. makes practically no movement in this direction or if possible. The membrane must be connected to the bead at its front circumferential edge.

Die Klangqualität eines Lautsprechers ist dabei unter ande­rem von der einwandfreien Funktion der Zentriermembran und der Sicke sowie von dem Verhalten der Membran selbst abhän­gig.The sound quality of a loudspeaker depends, among other things, on the perfect functioning of the centering membrane and the bead, as well as on the behavior of the membrane itself.

Der Erfindung liegt die Aufgabe zugrunde, die Membran für einen Lautsprecher so auszubilden, daß einerseits der Auf­wand für das Verkleben der Membran mit der Sicke verringert und die Klangqualität des Lautsprechers erhöht wird.The invention has for its object to design the membrane for a speaker so that on the one hand the effort for gluing the membrane to the bead is reduced and the sound quality of the speaker is increased.

Diese Aufgabe wird durch die im Anspruch 1 beschriebene Er­findung gelöst. vorteilhafte Weiterbildungen der Erfindung sind in den Unteransprüchen beschrieben.This object is achieved by the invention described in claim 1. advantageous developments of the invention are described in the subclaims.

Bei der erfindungsgemäßen Lösung erfüllen somit die beiden Folien, die zusammen die Membran bilden, je für sich unter­schiedliche Aufgaben. Die erste, vorzugsweise aus Polycarbon­at bestehende Folie mit einem relativ hohen Elastizitätsmo­dul übernimmt dabei die Aufgabe der notwendigen Formstabili­sierung der Membran. Sie gibt somit der Membran die für eine verzerrungsfreie Wiedergabe notwendige Steifigkeit. Die zwei­te, kaschierte Folie ist als thermische Polyurethan-Folie ausgebildet und dient zur Bedämpfung von Partialschwingungen der Membran. Sie hat gegenüber der ersten Folie einen wesent­lich kleineren Elastizitätsmodul. Durch diese Zweilagen-Mem­bran können die Anforderungen einerseits an die Formstabili­tät der Membran und andererseits an die Bedämpfung der Par­tialschwingungen derart erfüllt werden, daß die Klangquali­tät des Lautsprechers erhöht wird. Die zweite, thermische Folie erstreckt sich vorzugsweise auch über den äußeren Rand­bereich der Membran und kann daher in vorteilhafter Weise zur Vereinfachung des Klebevorganges der Sicke mit der Mem­bran zusätzlich mit herangezogen werden. Die thermische zwei­te Folie dient dann im Bereich der Membran zur Bedämpfung der Partialschwingungen und im Randbereich zusätzlich für einen Heißsiegelvorgang oder einen Heißpreßvorgang zur Befe­stigung der Sicke an der Membran. Die erfindungsgemäße Mem­bran ist insbesondere geeignet für einen Konuslautsprecher für einen Fernsehempfänger.In the solution according to the invention, the two films which together form the membrane therefore each perform different tasks. The first film, which is preferably made of polycarbonate and has a relatively high modulus of elasticity, takes on the task of stabilizing the membrane. It thus gives the membrane the one distortion-free reproduction necessary rigidity. The second, laminated film is designed as a thermal polyurethane film and serves to dampen partial vibrations of the membrane. Compared to the first film, it has a much smaller modulus of elasticity. Through this two-layer membrane, the requirements on the dimensional stability of the membrane and on the other hand on the damping of the partial vibrations can be met in such a way that the sound quality of the loudspeaker is increased. The second, thermal film preferably also extends over the outer edge region of the membrane and can therefore also be used in an advantageous manner to simplify the gluing process of the bead with the membrane. The thermal second film then serves in the area of the membrane for damping the partial vibrations and in the edge area additionally for a heat sealing process or a hot pressing process for fastening the bead to the membrane. The membrane according to the invention is particularly suitable for a cone loudspeaker for a television receiver.

Die Erfindung wird anhand der Zeichnung an Ausführungsbei­spielen erläutert. Darin zeigen

  • Fig. 1 den Aufbau eines Konuslautsprechers,
  • Fig. 2 einen Ausschnitt aus der Fig. 1 bei "A" und
  • Fig. 3 eine andere Ausbildung von Membran und Sicke bei "B".
The invention is explained with the aid of exemplary embodiments. Show in it
  • 1 shows the structure of a cone speaker,
  • Fig. 2 shows a section of Fig. 1 at "A" and
  • Fig. 3 shows another design of membrane and bead at "B".

Fig. 1 zeigt einen Lautsprecher mit dem Korb 1, dem Magneten 2, der Schwingspule 3, der Zentriermembran 4, der konusförmi­gen Membran 5 und der Sicke 6. Die Zentriermembran 4 und die Sicke 6 sind durch einen Heißsiegelvorgang, einen Heißpreß­vorgang oder durch Ultraschallschweißen jeweils mit dem Rand der Membran 5 verbunden. Der innere Rand der Zentriermembran 4 ist mit der Schwingspule 3 und der äußere Rand der Sicke 6 mit dem Korb 1 verbunden.Fig. 1 shows a loudspeaker with the basket 1, the magnet 2, the voice coil 3, the centering membrane 4, the conical membrane 5 and the bead 6. The centering membrane 4 and the bead 6 are each by a heat sealing process, a hot pressing process or by ultrasonic welding connected to the edge of the membrane 5. The inner edge of the centering membrane 4 is connected to the voice coil 3 and the outer edge of the bead 6 to the basket 1.

Fig. 2 zeigt den Aufbau der Membran 5. Die Membran 5 besteht aus einer ersten Folie 5a relativ großer Dicke von etwa 250 µm aus Polycarbonat mit einem Elastizitätsmodul von etwa 2x10³ N/mm². Auf die Vorderseite, also die in Schallabstrahl­richtung weisende Oberfläche der Folie 5a ist die zweite Fo­lie 5b aufgedampft. Die Folie 5b ist eine thermische Polyure­than-Folie mit einer Dicke von ca 50 µm und einem Elastizi­tätsmodul von 10 ... 500 N/mm². Die zweite Folie 5b dient im wesentlichen zur Bedämpfung der Partialschwingungen der Mem­bran 5 im oberen Randbereich und gleichzeitig zur Herstel­lung des Klebevorganges zwischen der Sicke 6 und der Membran 5.Fig. 2 shows the structure of the membrane 5. The membrane 5 consists of a first film 5a of relatively large thickness of about 250 microns made of polycarbonate with an elastic modulus of about 2x10³ N / mm². The second film 5b is evaporated onto the front side, that is to say the surface of the film 5a pointing in the direction of sound emission. The film 5b is a thermal polyurethane film with a thickness of approx. 50 µm and an elastic modulus of 10 ... 500 N / mm². The second film 5b essentially serves to dampen the partial vibrations of the membrane 5 in the upper edge region and at the same time to produce the adhesive process between the bead 6 and the membrane 5.

Das Ausgangsmaterial für die Membran, d.h. eine Folie gemäß Fig. 2, hat eine große Wölbfähigkeit für einen Tiefziehvor­gang und ist daher insbesondere für Konusmembranen geeignet.The starting material for the membrane, i.e. 2, has a large curvature for a deep-drawing process and is therefore particularly suitable for cone membranes.

In Fig. 1 ist angenommen, daß die Membran 5 mit der Sicke 6 verbunden ist. Diese Verbindung kann vorzugsweise durch ei­nen Heißklebevorgang oder einen Heißpreßvorgang unter Ausnut­zung der thermischen Schicht 5b oder durch Ultraschallschwei­ßen erfolgen. Ein derartiges Verfahren ist beschrieben in der älteren Patentanmeldung P 36 20 889.2. Auf gleiche Weise kann die Membran 5 auch mit der Zentriermembran 4 verbunden werden.In Fig. 1 it is assumed that the membrane 5 is connected to the bead 6. This connection can preferably be made by a hot gluing process or a hot pressing process using the thermal layer 5b or by ultrasonic welding. Such a method is described in the earlier patent application P 36 20 889.2. In the same way, the membrane 5 can also be connected to the centering membrane 4.

Fig. 3 zeigt eine andere Ausführungsform der Membran und der Sicke 6. Im Gegensatz zu Fig. 1 bestehen Membran 5 und Sicke 6 aus dem gleichen durchgehenden Material und sind in einem Arbeitsvorgang durch Tiefziehen aus einem großflächigen Mate­rial mit den beiden Folien 5a und 5b hergestellt. Dazu wer­den z.B. große Platten mit einer Breite von etwa 1,2 m mit den beiden Folien 5a und 5b durch Aufkaschieren hergestellt. Die im Regelfall dünnere Folie 5b kann auch auf die dickere Folie 5a aufgewalzt sein. Durch das Verhältnis zwischen der Dicke D der Folie 5a und der Dicke d Folie 5b kann das Klang­verhalten des mit der Membran 5 versehenden Lautsprechers je nach Bedarf beeinflußt werden. Die Dicke D der Folie 5a be­trägt z.B. 200 µm ± 40 µm und die Dicke d der Folie 5b 100 µm ± 50 µm. Das Dickenverhältnis D/d kann also im Extremfall auch in der Größenordnung von 1 liegen.3 shows another embodiment of the membrane and the bead 6. In contrast to FIG. 1, the membrane 5 and bead 6 are made of the same continuous material and are produced in one operation by deep drawing from a large area material with the two foils 5a and 5b . For this purpose, large panels with a width of approximately 1.2 m are included the two films 5a and 5b produced by lamination. The film 5b, which is generally thinner, can also be rolled onto the thicker film 5a. The relationship between the thickness D of the film 5a and the thickness d of the film 5b can influence the sound behavior of the loudspeaker provided with the membrane 5 as required. The thickness D of the film 5a is, for example, 200 µm ± 40 µm and the thickness d of the film 5b is 100 µm ± 50 µm. In extreme cases, the thickness ratio D / d can also be on the order of 1.

Durch den Tiefziehvorgang kann die Gesamtdicke (D + d) im Be­reich der Sicke 6 kleiner sein als im Bereich der Membran 5, wobei vorzugsweise das Dickenverhältnis D/d bei Membran 5 und Sicke 6 gleich ist.As a result of the deep-drawing process, the total thickness (D + d) in the area of the bead 6 can be smaller than in the area of the membrane 5, the thickness ratio D / d for membrane 5 and bead 6 preferably being the same.

Claims (11)

1. Membran für einen Lautsprecher, dadurch gekennziechnet, daß die Membran (5) aus einer ersten, zur Formstabili­sierung dienenden Kunststoffolie (5a) und aus einer dar­auf aufgebrachten zweiten, zur Bedämpfung von Partial­schwingungen dienenden Kunststoffolie (5b) besteht.1. Membrane for a loudspeaker, characterized in that the membrane (5) consists of a first plastic film (5a) serving for shape stabilization and a second plastic film (5b) applied thereon for damping partial vibrations. 2. Membran nach Anspruch 1, dadurch gekennzeichnet, daß die erste Folie (5a) aus Polycarbonat besteht.2. Membrane according to claim 1, characterized in that the first film (5a) consists of polycarbonate. 3. Membran nach Anspruch 1, dadurch gekennzeichnet, daß die zweite Folie (5b) aus Polyurethan besteht.3. Membrane according to claim 1, characterized in that the second film (5b) consists of polyurethane. 4. Membran nach Anspruch 4, dadurch gekennzeichnet, daß der E-Modul der ersten Folie (5a) etwa 2˙10³ N/mm² und der E-Modul der zweiten Folie (5b) etwa 10-500 N/mm² beträgt.4. Membrane according to claim 4, characterized in that the modulus of elasticity of the first film (5a) is approximately 2˙10³ N / mm² and the modulus of elasticity of the second film (5b) is approximately 10-500 N / mm². 5. Membran nach Anspruch 1, dadurch gekennzeichnet, daß die zweite Folie (5b) nur auf die vordere, in Abstrahl­ richtung weisende Oberfläche der Membran (5) aufge­bracht ist.5. Membrane according to claim 1, characterized in that the second film (5b) only on the front, in radiation directional surface of the membrane (5) is applied. 6. Membran nach Anspruch 1, dadurch gekennziechnet, daß die Membran in einem Arbeitvorgang aus einem fertigen, großflächigen, beide Folien (5a, 5b) enthaltenden Mate­rial durch Tiefziehen hergestellt ist.6. Membrane according to claim 1, characterized in that the membrane is produced in one operation from a finished, large area, both films (5a, 5b) containing material by deep drawing. 7. Membran nach Anspruch 1, dadurch gekennzeichnet, daß die erste Folie (5a) eine Dicke (D) von ca 200 µm ± 40 µm und die zweite Folie (5b) eine Dicke (d) von ca 100 µm ± 50 µm aufweist.7. A membrane according to claim 1, characterized in that the first film (5a) has a thickness (D) of approximately 200 µm ± 40 µm and the second film (5b) has a thickness (d) of approximately 100 µm ± 50 µm. 8. Membran nach Anspruch 1, dadurch gekennzeichnet, daß die Membran (5) und die Sicke (6) durchgehend aus dem­selben Material durch einen Tiefziehvorgang hergestellt sind (Fig. 3).8. Membrane according to claim 1, characterized in that the membrane (5) and the bead (6) are continuously made of the same material by a deep-drawing process (Fig. 3). 9. Schwindgeinsatz für einen Lautsprecher mit einer Schwin­gspule (3), einer Zentriermembran (4), einer Sicke (6) und einer Membran (5) nach einem oder mehreren der An­sprüche 1 - 8, dadurch gekennzeichnet, daß die Sicke (6) aus thermoplastischem Polyurethan besteht.9. Schwindg insert for a loudspeaker with a voice coil (3), a centering membrane (4), a bead (6) and a membrane (5) according to one or more of claims 1-8, characterized in that the bead (6) thermoplastic polyurethane. 10. Schwingeinsatz nach Anspruch 9, dadurch gekkenzeichnet, daß die Membran (5) mit der Sicke (6) durch einen Heiß­klebevorgang, einen Heißpreßvorgang oder durch Ultra­schallschweißen verbunden ist.10. Vibration insert according to claim 9, characterized in that the membrane (5) with the bead (6) is connected by a hot gluing process, a hot pressing process or by ultrasonic welding. 11. Lautsprecher mit einer Membran (5) oder einem Schwin­geinsatz nach einem oder mehreren der Ansprüche 1 - 10.11. Loudspeaker with a membrane (5) or a vibrating insert according to one or more of claims 1-10.
EP88110444A 1987-07-03 1988-06-30 Membrane for loudspeaker Expired - Lifetime EP0297572B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88110444T ATE63190T1 (en) 1987-07-03 1988-06-30 MEMBRANE FOR A LOUDSPEAKER.

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE19873722832 DE3722832A1 (en) 1987-07-03 1987-07-03 Diaphragm for a loudspeaker
DE3722832 1987-07-03
DE3744356 1987-12-29
DE3744356 1987-12-29

Publications (2)

Publication Number Publication Date
EP0297572A1 true EP0297572A1 (en) 1989-01-04
EP0297572B1 EP0297572B1 (en) 1991-05-02

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Family Applications (2)

Application Number Title Priority Date Filing Date
EP88110444A Expired - Lifetime EP0297572B1 (en) 1987-07-03 1988-06-30 Membrane for loudspeaker
EP88905783A Pending EP0366693A1 (en) 1987-07-03 1988-06-30 Membrane for a loudspeaker

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP88905783A Pending EP0366693A1 (en) 1987-07-03 1988-06-30 Membrane for a loudspeaker

Country Status (8)

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US (1) US5162619A (en)
EP (2) EP0297572B1 (en)
JP (1) JPH02504211A (en)
KR (1) KR890702402A (en)
DE (1) DE3862617D1 (en)
ES (1) ES2023233B3 (en)
GR (1) GR3002336T3 (en)
WO (1) WO1989000372A1 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0685981A2 (en) * 1994-06-01 1995-12-06 NOKIA TECHNOLOGY GmbH Loudspeaker
WO2008056287A1 (en) * 2006-11-08 2008-05-15 Nxp B.V. Compound membrane, method of manufacturing the same, and acoustic device

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US5682021A (en) * 1995-06-14 1997-10-28 Lg Electronics, Inc. Howling phenomena removing apparatus for video display appliances
DE19526124C2 (en) * 1995-07-19 1997-06-26 Sennheiser Electronic Establishment with active noise compensation
WO1999041940A1 (en) * 1998-02-17 1999-08-19 Koninklijke Philips Electronics N.V. An electroacoustic transducer and a diaphragm for an electroacoustic transducer
EP0963136B1 (en) * 1998-05-08 2011-08-31 Panasonic Corporation Speaker
DE20005543U1 (en) * 2000-03-24 2000-06-21 Peng Jack Vibration membrane speakers
JP2007522756A (en) 2004-02-17 2007-08-09 コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ Method and apparatus for changing the characteristics of a film body for an electroacoustic transducer
CN101147422B (en) * 2005-03-10 2012-11-21 楼氏电子亚洲有限公司 Membrane with high resistance against buckling and/or crinkling
JP4059265B2 (en) * 2005-06-08 2008-03-12 オンキヨー株式会社 Speaker member and manufacturing method thereof
US7899202B2 (en) * 2006-04-17 2011-03-01 Sound Sources Technology, Inc. Loudspeaker with cone-coupled damper
CN101304622A (en) * 2007-05-09 2008-11-12 富准精密工业(深圳)有限公司 Audio film structure of electroacoustic apparatus and preparation method thereof
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CA1098774A (en) * 1976-05-17 1981-04-07 Hirotoshi Niguchi Acoustic diaphragm with polyurethane elastomer coating
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US3285364A (en) * 1965-06-01 1966-11-15 Ling Temco Vought Inc Loudspeaker construction
FR2067239A1 (en) * 1969-10-22 1971-08-20 Foster Electric Co Ltd
FR2310053A1 (en) * 1975-04-29 1976-11-26 Philips Nv ACOUSTIC ELECTRIC TRANSDUCER, PROCESS FOR ITS MANUFACTURING AND DEVICE ALLOWING THE IMPLEMENTATION OF SUCH A PROCESS
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GB1518285A (en) * 1975-11-18 1978-07-19 Akroyd J Acoustic reproducers
GB2112604A (en) * 1980-12-03 1983-07-20 Onkyo Kk Loudspeaker diaphragm and process for producing same

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EP0685981A2 (en) * 1994-06-01 1995-12-06 NOKIA TECHNOLOGY GmbH Loudspeaker
EP0685981A3 (en) * 1994-06-01 1996-06-05 Nokia Technology Gmbh Loudspeaker.
US5699439A (en) * 1994-06-01 1997-12-16 Nokia Technology Gmbh Loudspeakers
WO2008056287A1 (en) * 2006-11-08 2008-05-15 Nxp B.V. Compound membrane, method of manufacturing the same, and acoustic device
US8284964B2 (en) 2006-11-08 2012-10-09 Knowles Electronics Asia Pte. Ltd. Compound membrane, method of manufacturing the same, and acoustic device

Also Published As

Publication number Publication date
US5162619A (en) 1992-11-10
EP0297572B1 (en) 1991-05-02
JPH02504211A (en) 1990-11-29
KR890702402A (en) 1989-12-23
DE3862617D1 (en) 1991-06-06
ES2023233B3 (en) 1992-01-01
WO1989000372A1 (en) 1989-01-12
EP0366693A1 (en) 1990-05-09
GR3002336T3 (en) 1992-12-30

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