EP0297572B1 - Membrane for loudspeaker - Google Patents

Membrane for loudspeaker Download PDF

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Publication number
EP0297572B1
EP0297572B1 EP88110444A EP88110444A EP0297572B1 EP 0297572 B1 EP0297572 B1 EP 0297572B1 EP 88110444 A EP88110444 A EP 88110444A EP 88110444 A EP88110444 A EP 88110444A EP 0297572 B1 EP0297572 B1 EP 0297572B1
Authority
EP
European Patent Office
Prior art keywords
membrane
film
loudspeaker
serves
membrane according
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
EP88110444A
Other languages
German (de)
French (fr)
Other versions
EP0297572A1 (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
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=25857458&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0297572(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
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
Application granted granted Critical
Publication of EP0297572B1 publication Critical patent/EP0297572B1/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
    • 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 invention is based on a membrane for a loudspeaker according to the preamble of claims 1 and 2.
  • a membrane for a loudspeaker according to the preamble of claims 1 and 2.
  • Such a membrane is known from US Pat. Nos. 3,285,364, 3,020,207 and GB 1,518,285.
  • Such membranes with two films with different tasks are relatively difficult to manufacture in terms of production technology. This is due, among other things, to the fact that the first film, which serves to stabilize the shape, ends at the outer edge of the membrane, which is connected to the speaker basket via the bead.
  • the invention has for its object to simplify the manufacture of such membranes with two plastic films for 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. With 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 is then used in the area of the membrane to dampen the partial vibrations and in the edge area additionally for a heat sealing process or a hot pressing process for attaching 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 2 ⁇ 103 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 process is described in the older German application published on December 23, 1987 under No. 36 20 889.
  • the membrane 5 can also be connected to the centering membrane 4.
  • FIG. 3 shows another embodiment of the membrane and the bead 6.
  • the membrane 5 and bead 6 consist 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.

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)

Description

Die Erfindung geht aus von einer Membran für einen Lautsprecher gemäß dem Oberbegriff der Ansprüche 1 und 2. Eine derartige Membran ist bekannt durch die US-3 285 364, 3 03 207 und GB-1 518 285.The invention is based on a membrane for a loudspeaker according to the preamble of claims 1 and 2. Such a membrane is known from US Pat. Nos. 3,285,364, 3,020,207 and GB 1,518,285.

Derartige Membranen mit zwei Folien mit unterschiedlichen Aufgaben sind fertigungstechnisch relativ schwierig herstellbar. Das beruht unter anderem darauf, daß die erste, zur Formstabilisierung dienende Folie am äußeren Rand der Membran, der über die Sicke mit dem Lautsprecherkorb verbunden ist, endet.Such membranes with two films with different tasks are relatively difficult to manufacture in terms of production technology. This is due, among other things, to the fact that the first film, which serves to stabilize the shape, ends at the outer edge of the membrane, which is connected to the speaker basket via the bead.

Der Erfindung liegt die Aufgabe zugrunde, die Fertigung derartiger Membranen mit zwei Kunststoffolien für unterschiedliche Aufgaben zu vereinfachen.The invention has for its object to simplify the manufacture of such membranes with two plastic films for different tasks.

Diese Aufgabe wird durch die in den Ausprüchen 1 und 2 angegebenen Erfindungen gelöst. Vorteilhafte Weiterbildungen der Erfindungen sind in den Unteransprüchen angegeben.This object is achieved by the inventions specified in claims 1 and 2. Advantageous developments of the inventions are specified in the subclaims.

Die erste, vorzugsweise aus Polycarbonat bestehende Folie mit einem relativ hohen Elastizitätsmodul übernimmt die Aufgabe der notwendigen Formstabilisieruung 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.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. With 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 is then used in the area of the membrane to dampen the partial vibrations and in the edge area additionally for a heat sealing process or a hot pressing process for attaching 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 2 × 10³ 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 2 × 10³ 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 am 23.12.87 unter der Nr. 36 20 889 offengelegten deutschen Ammeldung. 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 process is described in the older German application published on December 23, 1987 under No. 36 20 889. 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.FIG. 3 shows another embodiment of the membrane and the bead 6. In contrast to FIG. 1, the membrane 5 and bead 6 consist 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 (8)

1. A membrane for a loudspeaker, which consists of a first plastics film (5a) which serves to stabilise shape and of a second plastics film (5b) applied thereto which serves to damp partial resonance, characterised in that the corrugation (6) which connects the outer edge of the membrane with the loudspeaker chassis frame (1) is manufactured with the same two-layer material as the membrane.
2. A membrane for a loudspeaker, which consists of a first plastics film (5a) which serves to stabilise shape and of a second plastics film (5b) applied thereto which serves to damp partial resonance, characterised in that the corrugation (6) connecting the outer edge of the membrane with the loudspeaker chassis frame (1) consists of thermoplastic polyurethane and is connected to the second layer (5b) by a hot process.
3. A membrane according to claim 1 or 2, characterised in that the first film (5a) consists of polycarbonate.
4. A membrane according to claim 1, characterised in that the second film (5b) consists of polyurethane.
5. A membrane according to claim 1 or 2, characterised in that the E-modulus of the first film (5a) amounts to approximately 2 · 10³ N/mm² and the E-modulus of the second film (5b) amounts to approximately 10-500 N/mm².
6. A membrane according to claim 1 or 2, characterised in that the second film (5b) is only applied to the front surface of the membrane (5) which is directed in the direction of radiation.
7. A membrane according to claim 1 or 2, characterised in that the membrane is manufactured by deep drawing in one operation from a finished, sheet material containing both films (5a, 5b).
8. A membrane according to claim 1 or 2, characterised in that the first film (5a) has a thickness (D) of about 200 µm +/-  40 µm and the second film (5b) has a thickness (d) of about 100 µm +/- 50 µm.
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 EP0297572A1 (en) 1989-01-04
EP0297572B1 true EP0297572B1 (en) 1991-05-02

Family

ID=25857458

Family Applications (2)

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

Family Applications Before (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)

Country Link
US (1) US5162619A (en)
EP (2) EP0366693A1 (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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ATE205040T1 (en) * 1994-06-01 2001-09-15 Harman Audio Electronic Sys SPEAKER
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
EP0974243B1 (en) * 1998-02-17 2003-10-08 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, Chung Li, Taoyuan Vibration membrane speakers
CN1922923B (en) 2004-02-17 2012-10-31 楼氏电子亚洲有限公司 Method of and device for modifying the properties of a membrane 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
EP2080407A1 (en) * 2006-11-08 2009-07-22 Nxp B.V. Compound membrane, method of manufacturing the same, and acoustic device
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
DE102014225579A1 (en) * 2014-12-11 2016-06-16 Tesa Se Multi-layer composite for acoustic membranes

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US3093207A (en) * 1960-10-04 1963-06-11 R T Bozak Mfg Company Metallic diaphragm for electrodynamic loudspeakers
US3285364A (en) * 1965-06-01 1966-11-15 Ling Temco Vought Inc Loudspeaker construction
GB1271539A (en) * 1969-10-22 1972-04-19 Foster Electric Co Ltd Diaphragm for loud speakers and method of making the same
AT338351B (en) * 1975-04-29 1977-08-25 Philips Nv ELECTROACOUSTIC CONVERTER, METHOD FOR MANUFACTURING SUCH A CONVERTER AND DEVICE FOR CARRYING OUT SUCH METHODS
DE2541391A1 (en) * 1975-09-17 1977-03-31 Grundig Emv Thermoplastic membrane bonded to moving coil of dynamic transducer - by coating with heat activated adhesive and centring with winding mandrel
GB1518285A (en) * 1975-11-18 1978-07-19 Akroyd J Acoustic reproducers
GB1563511A (en) * 1976-03-19 1980-03-26 Harwood H Diaphragms for electroacoustic transducers
CA1098774A (en) * 1976-05-17 1981-04-07 Hirotoshi Niguchi Acoustic diaphragm with polyurethane elastomer coating
JPS53129616A (en) * 1977-04-18 1978-11-11 Hitachi Chemical Co Ltd Edge part of vibration plate for electric sound transducer
JPS5927156B2 (en) * 1980-12-03 1984-07-03 オンキヨー株式会社 Manufacturing method of speaker diaphragm
JPS58116000A (en) * 1981-12-28 1983-07-09 Sony Corp Manufacture for diaphragm

Also Published As

Publication number Publication date
US5162619A (en) 1992-11-10
GR3002336T3 (en) 1992-12-30
JPH02504211A (en) 1990-11-29
KR890702402A (en) 1989-12-23
ES2023233B3 (en) 1992-01-01
WO1989000372A1 (en) 1989-01-12
EP0297572A1 (en) 1989-01-04
EP0366693A1 (en) 1990-05-09
DE3862617D1 (en) 1991-06-06

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