EP0966862B1 - Haut-parleur et procede de production d'un haut-parleur - Google Patents

Haut-parleur et procede de production d'un haut-parleur Download PDF

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Publication number
EP0966862B1
EP0966862B1 EP98914834A EP98914834A EP0966862B1 EP 0966862 B1 EP0966862 B1 EP 0966862B1 EP 98914834 A EP98914834 A EP 98914834A EP 98914834 A EP98914834 A EP 98914834A EP 0966862 B1 EP0966862 B1 EP 0966862B1
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EP
European Patent Office
Prior art keywords
cone
beading
bead
polyurethane
process 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
EP98914834A
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German (de)
English (en)
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EP0966862A2 (fr
Inventor
Siegfried Schriever
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Individual
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Individual
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Publication date
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Publication of EP0966862A2 publication Critical patent/EP0966862A2/fr
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Publication of EP0966862B1 publication Critical patent/EP0966862B1/fr
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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
    • H04R31/00—Apparatus or processes specially adapted for the manufacture of transducers or diaphragms therefor
    • H04R31/006—Interconnection of transducer parts
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R7/00—Diaphragms for electromechanical transducers; Cones
    • H04R7/16—Mounting or tensioning of diaphragms or cones
    • H04R7/18—Mounting or tensioning of diaphragms or cones at the periphery
    • 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
    • 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
    • H04R2307/201—Damping aspects of the outer suspension of loudspeaker diaphragms by addition of additional damping means

Definitions

  • the invention relates to a loudspeaker with a cone and with a bead connected to the cone as well as a Method of manufacturing such a loudspeaker.
  • Speakers of the aforementioned type are dynamic speakers, where there is a voice coil inside the magnetic field due to a permanent magnet electrical signals moved. This sets in with the Coil connected cone in motion and generates sound waves. The cone thus places the surrounding air in one electrical signal equivalent movement, where no audible natural vibrations of the cone should occur. The cone must therefore have a high internal damping. Therefore, in the prior art as a material of the cone fibrous paper mixture, plastic, metal foam or metal, preferably used in a honeycomb structure.
  • the cone can move as freely as possible can, it is necessary to use the outer end of the cone to connect a speaker basket with a bead, which the cone with the most constant spring action in its predetermined direction of movement.
  • a bead made of rubber, foam or coated fabric is made.
  • EP 0 552 040 A1 discloses a speaker with a cone that is made of hard polypropylene.
  • the one connected to the cone Bead is made of a soft polymer material manufactured so that the different requirements the hardness of the material of the cone on the one hand and the bead on the other hand, it is guaranteed.
  • the loudspeaker turns the cone in inserted part of a two-part mold. Subsequently the mold is closed with the second part.
  • the two mold parts are designed such that in the closed State a cavity remains that of shape corresponds to the bead to be molded.
  • Into this cavity from a circular food container elastomeric material injected, which - after solidification - the bead forms.
  • a loudspeaker is also known from EP 0 632 674 A1, its cone made of polypropylene and its bead and the associated Support part as a seal made of a thermoplastic synthetic resin is made.
  • a dicromatic mold applied in which in one first process step of the cone made of polypropylene in one Mold is made.
  • the bead and the supporting part with seal from the thermoplastic synthetic resin in the mold Injection made.
  • the curing of the materials they connect at the specified seams with each other, so that a permanent connection is created.
  • EP 0 632 675 A1 is a loudspeaker known, in which both the cone and the bead woven materials exist, but in different Quantity processed with a thermoplastic resin have been. This results in different levels of hardness for the cone and the bead.
  • EP 0 379 246 A1 describes a process for the production and application of a sprayable polyurethane material.
  • This process uses a polyurethane reaction mixture made of two components, which by means of a Spray gun on a surface of a negative mold for making sprayed onto a film in a homogeneous thickness becomes.
  • the spray gun has one for each component Nozzle through which the respective component emerges.
  • the hardness of the polyurethane film can thus set within wide limits. That in EP 0 379 246 B1 described method is used in particular for production of fittings in the manufacture of motor vehicles.
  • the present invention now has the technical problem based on a speaker and a method of manufacture specify a speaker where the above described Disadvantages of the prior art avoided become.
  • the technical problem outlined above through a speaker with a cone and with a bead connected to the cone, where the bead from a sprayed elastic plastic layer made in the solidified state consists.
  • the plastic layer consists of a thermoplastic Material.
  • the layer consists of a two component Reaction mixture as in a second preferred Embodiment can be set by adjusting the Amounts of the components of the polyurethane layer according to the invention depending on the application, the elasticity of the bead is very precise can be set.
  • the bead preferably contains one or more of the substances Polyurethane, polypropylene, polyvinyl chloride or polyethylene.
  • the bead is preferably made of varietal purity a polyurethane layer.
  • Another advantage of using the above materials, in particular of polyurethane is that the bead made from it is waterproof, being light Values of 50 mm WS and more can be achieved. Thus, in reliably used the speakers even in places be in which there is a risk of moisture get in touch. Vehicle doors are an example called.
  • the cone also exists made of the same material as the bead, for which special preferred embodiment from a polyurethane layer, the however, unlike the bead is hard and a suitable one Stiffness has to meet the requirements for sound generation enough through the speaker. So both exist the cone and the bead made of a polyurethane layer, this results in a further advantageous manner increased purity of the components of the loudspeaker, so that later disposal or recycling is simplified becomes.
  • Another advantage results from the fact that a seal is provided, which is attached to the bead, preferably also a material connection between the bead and the seal is provided.
  • a two-component reaction mixture of existing plastic can be used by appropriate choice of Mixing ratio of the two components, depending on the shape, Size and performance requirements for the speakers that The elasticity of the bead can be adjusted very precisely.
  • the plastic preferably consists of a two-component Polyurethane reaction mixture.
  • the cone is also made of a polyurethane layer manufactured, however, a greater hardness than that Has previously described bead.
  • To make the cone is also a two-component polyurethane reaction mixture sprayed into the open negative form and trimmed after curing.
  • Preferably the cone and the bead become two in a row Work steps by spraying one out of two Components existing polyurethane reaction mixture in made the same negative form. Since cone and bead basically made of the same material with only different ones If there is hardness, a firm material bond is created Connection between cone and bead on the corresponding Interface.
  • the cone is made separately before the bead is made, This is how the cone can be used in the described method both before spraying the polyurethane layer for manufacture the bead as well as after spraying in the negative form arranged and positioned. In both cases then becomes a during the curing of the polyurethane layer fixed connection between the cone and the bead, without creating a separate adhesive connection must become.
  • Another improvement of the method according to the invention is achieved in that before spraying the polyurethane layer a sealing ring in a to produce the bead recess provided in the negative form is used. Then the polyurethane layer on the negative mold as well on the side facing the open side of the negative form of the sealing ring is sprayed on during the curing process the polyurethane layer a firm connection between the Surround and the sealing ring. Again, use can of an adhesive can be avoided.
  • the method according to the invention is more preferred when using rotationally symmetrical negative shapes simplified by the negative form during the Spraying the polyurethane layer is rotated and the Spray head only performs a substantially linear movement.
  • a suitable synchronization between the Rotational motion and linear motion becomes a uniform one
  • Application of the polyurethane layer ensures that the most uniform possible polyurethane layer is created.
  • Compliance with a predetermined layer thickness is beyond that also by using a matched to the negative form Counterform achieved after spraying the polyurethane layer is put on to a precisely defined To generate thickness of the polyurethane layer.
  • the still flowable polyurethane layer between including the negative form and the counter form the have a predetermined distance from each other. After this Curing is then a polyurethane layer with a precise defined thickness arose.
  • the facing the polyurethane layer Side of the counter mold as well as the surface of the negative mold is covered with a release agent.
  • the amount of release agent can be reduced or it can be due to that Release agent even dispensed with at least in the negative form if there are openings in the negative form, through the compressed air to facilitate demolding. This ensures in particular that the areas where a connection of the polyurethane layer with the arranged in a recess of the negative mold Seal should arise, no release agent available that can impair such a connection.
  • Figs. 1 and 2 of the drawing is part of a loudspeaker shown, the one cone 2 and one bead 4 connected to the cone 2.
  • the bead can as in the illustrated embodiment, towards the inside Speakers are arched.
  • the invention is self-evident not on loudspeakers with such shaped beads limited. Rather, with the method according to the invention Beads of various shapes can be produced.
  • On the adjacent edges of the bead 4 and the cone 2 these are connected to one another with a connection point 6.
  • This connection point 6 is on the inner edge of the Beading 4 arranged.
  • the bead 4 has a conical shape Part 8, which is essentially on the surface of the cone 2 is aligned.
  • the bead also has an outer annular part 10, which is used to attach the unit from bead 4 and cone 2 with one not in the drawing loudspeaker basket shown.
  • This part 10 can release agent-free by using the method according to the invention kept and thus safe without further preparatory work be glued to the basket.
  • the conical part 8 and the annular part 10 of the bead 4 are connected by an annular, a section 12 forming a curve, which forms the actual bead.
  • This elastic Section 12 or the bead enables relative movement of the cone 2 opposite the stationary annular part 10, the elastic properties of the annular Part 12 are chosen so that the vibration properties of the cone 2 are only slightly influenced.
  • the bead 4 made of a soft polyurethane layer. This offers the Advantage that the elastic properties of the bead very precisely through the mixing ratio of the components of the polyurethane can be adjusted.
  • the cone is made of a hard material, such as cardboard, made of a metal or polypropylene, the hardness of the cone 2 due to the material in each case is within predetermined limits.
  • Cone 2 as well as the bead 4 made of a polyurethane, wherein in the manufacture of the polyurethane layer of the cone 2 Mixing ratio of the components is chosen so that a harder polyurethane layer than the bead 4 is created. It follows that both the cone 2 and the beads 4 consist essentially of the same material, which only differs in its hardness.
  • connection point 6 overlap the connection point 6, the bead 4 and the cone 2, wherein the cone 2 is integrally connected to the bead 4.
  • the integral connection is created during the manufacturing process, which is described in more detail below.
  • the Cohesive connection has the advantage that no additional adhesive for connecting the bead 4 with the Cone 2 is required. If, in addition, both the cone 2 and the bead 4 consist of a polyurethane layer, a cohesive material results in a further advantageous manner Connection that is very reliable because of the same basic material of polyurethane a very good one Networking at the interface between the bead 4 and the Cone 2 can arise. Furthermore, both the cone 2 and the bead 4 approximately the same thermal properties on, so that temperature fluctuations to which the Speaker is not subject to a burden of Junction 6 between the cone 2 and the bead 4 to lead.
  • a seal 14 is provided which is attached to the outer annular part 10. This involves the manufacturing process described below a cohesive connection between the seal 14 and the bead 4 made by the polyurethane layer of Bead 4 applied directly to the surface of the seal 14 becomes. An additional adhesive is also avoided here and a very reliable connection between the Bead 4 and the seal 14 realized.
  • an open negative mold 16 is used, which is the shape of the a cone 2 and a surround 4 speaker pretends.
  • the cone 2 in the negative form 16 arranged and fixed in its exact position.
  • a two-component polyurethane reaction mixture sprayed into the open negative mold 16, so that a bead 4 is formed, which with the outer Edge of the cone 2 is connected.
  • the bead 4 has a high Elasticity
  • the bead 4 is made of a soft Polyurethane layer.
  • the two components are at one temperature warmed up, in which the components are flowable and sprayed onto the negative mold using a spray gun can be.
  • the Negative mold 16 also warmed up so that after spraying the polyurethane layer and the negative mold 16 together cool down and the desired uniform curing process cause.
  • the bead 4 connects to the connection point 6 with the surface of the cone 2, so that a cohesive Connection between the bead 4 and the cone 2 is created.
  • the cone 2 is also in the form of a polyurethane layer formed by a two component Polyurethane reaction mixture in the open negative form 16 is sprayed on.
  • the Bead 4 becomes the mixing ratio in the production of cone 2 of the two components of the polyurethane chosen that a hard polyurethane layer is created that meets the requirements corresponds to the vibration behavior of the cone 2.
  • the cone 2 is also like that Bead 4 made of a polyurethane layer, so it is advantageous that the cone 2 and the bead 4 in two successive Steps by spraying one out two component existing polyurethane reaction mixture be made in the same negative form. It follows the advantage that the method for producing a Loudspeaker just a few coordinated work steps has and therefore performed easily and inexpensively can be.
  • Another simplification of the manufacturing process of a speaker is that before spraying the polyurethane layer of the bead 4 a seal 14 in the form a sealing ring in a provided in the negative mold 16 Recess 18 is used. That to the open side of the negative form 16 directed surface of the seal 14 is then when spraying the polyurethane with the polyurethane layer covered. It forms during the curing of the polyurethane then a firm integral connection between the Beading 4 and the seal 14, so that in an advantageous manner on an additional adhesive to connect the seal 14 with the bead 4 can be dispensed with.
  • the seal 14 then serves when attaching the speaker with the Bead 4 on the speaker basket, not shown Sealing the opening of the loudspeaker housing to the interior of the housing to prevent contamination from entering or prevent moisture.
  • the rotationally symmetrical negative shape 16 during of spraying the polyurethane layer rotated so that it is only necessary to use the spray head, not shown only to drive an essentially linear movement.
  • the polyurethane layer has a precisely defined thickness after curing, becomes a counterform after spraying on the polyurethane layer 20 placed, as shown in Fig. 1.
  • the counter form 20 extends along the outer portion of the cone 2 over the connection point 6, along of the conical part 8, the annular part 12 and along a portion of the annular portion 10 of FIG Beading 4. After curing the polyurethane layer points this has a precisely specified thickness, which is determined by the distance predefined between the negative mold 16 and the counter mold 20 is.
  • the counterform 20 consists of a suitable material a smooth surface, such as "Teflon" or Silicone rubber.
  • a suitable material such as "Teflon” or Silicone rubber.
  • the surface of the counter shape 20 provided with a release agent.
  • the release agent then forms a boundary layer between the sprayed Polyurethane layer and the surface of the counter mold 20.
  • the negative mold 16 can be provided with a release agent become.
  • the counter shape extends 20 only over a short section along the annular Part 10 of the bead 4, so that the outer region of the annular part 10 is not covered by the counter-shape 20 becomes. This leaves the outer area of the ring-shaped Part 10 free of release agents so that the beading 4 is glued in this area with a speaker basket or with others Speaker parts is possible without a release agent must be removed before gluing. This also leads the fact that the manufacture of the speaker is simplified an additional step to remove the Release agent at the glue point is avoided.
  • the method according to the invention for producing a loudspeaker thus has only a small advantage Number of operations due to separate operations for the gluing of the seal 14 with the bead 4 and the Beading 4 with cone 2 are eliminated. Beyond that Tool costs saved because the entire manufacturing process takes place in the negative form 16. Also compared to Beading that is manufactured using the foam embossing process considerable material savings have been achieved.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Manufacturing & Machinery (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)

Abstract

Le haut-parleur selon l'invention comporte un cône (2) et une moulure (4) reliée audit cône (2). Cette moulure est constituée d'une couche de matière plastique pulvérisable qui est molle à l'état solidifié. Pour réaliser un tel haut-parleur, on met en oeuvre un procédé selon lequel on utilise un moule négatif (16) ouvert dans lequel le cône (2) est placé et fixé. Ensuite, la matière plastique est pulvérisée dans le moule négatif (16) ouvert et la moulure (4) est constituée par la couche de matière plastique molle qui s'unit au cône (2).

Claims (19)

  1. Haut-parleur comportant:
    un cône (2), et
    une moulure (4) reliée au cône (2),
    caractérisé en ce que la moulure (4) est formée par une couche de matière plastique élastique ou de matière plastique qui est formée selon le procédé de pulvérisation et est élastique à l'état durci.
  2. Haut-parleur selon la revendication 1, caractérisé en ce que la moulure (4) est formée d'une couche de matière thermoplastique.
  3. Haut-parleur selon la revendication 1 ou 2, caractérisé en ce que la moulure (4) est formée par un mélange réactif à deux constituants.
  4. Haut-parleur selon l'une des revendications 1 à 3, caractérisé en ce que la moulure contient un ou plusieurs des matériaux: polyuréthane, polypropylène, polychlorure de vinyle ou polyéthylène.
  5. Haut-parleur selon l'une des revendications 1 à 4, caractérisé en ce que le cône (2) est formé par une couche de polyuréthane dure.
  6. Haut-parleur selon l'une des revendications 1 à 5, caractérisé en ce que le cône (2) est relié à la moulure (4) selon une liaison par matériau compatible.
  7. Haut-parleur selon l'une des revendications 1 à 6, caractérisé en ce qu'il est prévu une garniture d'étanchéité (14), qui est fixée à la moulure (4) en étant reliée de préférence selon une liaison par matériaux compatibles.
  8. Procédé pour fabriquer un haut-parleur
    selon lequel on utilise un moule creux ouvert (16),
    selon lequel on fixe le cône (2) dans le moule creux (16), et
    selon lequel on pulvérise une matière plastique pulvérisable dans le moule creux ouvert (16) et on forme une moulure (4) sous la forme d'une couche de matière plastique élastique molle, qui se fixe au cône (2).
  9. Procédé selon la revendication 8, caractérisé en ce qu'on utilise une matière thermoplastique.
  10. Procédé selon la revendication 8 ou 9, caractérisé en ce qu'on utilise comme matière plastique un mélange réactif formé de deux constituants.
  11. Procédé selon l'une des revendications 8 à 10, caractérisé en ce qu'on utilise une matière plastique qui contient une ou plusieurs des matières: polypropylène, polyuréthane, polychlorure de vinyle ou polyéthylène.
  12. Procédé selon l'une des revendications 8 à 11, selon lequel on réalise le cône (2) sous la forme d'une couche de polyuréthane dure, par le fait qu'on pulvérise un mélange réactif à base de polyuréthane, formé de deux constituants, dans le moule creux ouvert (16).
  13. Procédé selon la revendication 12, selon lequel on forme le cône (z) et la moulure (4) en deux étapes de travail successives par pulvérisation d'un mélange réactif à base de polyuréthane, formé de deux constituants, dans le même moule creux.
  14. Procédé selon l'une des revendications 8 à 13, selon lequel avant la pulvérisation de la couche de polyuréthane de la moulure (4), on insère une garniture d'étanchéité (14) dans un évidement (18) qui est prévu dans le moule en creux (16) et est relié à la moulure (4).
  15. Procédé selon l'une des revendications 8 à 14, selon lequel on fait tourner le moule creux (16) symétrique de révolution pendant la pulvérisation de la couche de polyuréthane et que la tête de pulvérisation exécute uniquement un déplacement essentiellement linéaire.
  16. Procédé selon l'une des revendications 8 à 15, selon lequel on applique un moule opposé (20) après pulvérisation de la couche de polyuréthane pour produire une épaisseur définie de façon précise de la couche de polyuréthane.
  17. Procédé selon la revendication 16, selon lequel le moule opposé (20) ne recouvre pas la zone du bord extérieur de la moulure (4).
  18. Procédé selon l'une des revendications 8 à 17, selon lequel on introduit de l'air comprimé par des ouvertures prévues dans le moule creux (16) de manière à faciliter le démoulage.
  19. Procédé selon l'une des revendications 8 à 18, selon lequel à l'aide d'un couteau, on rogne la moulure terminée (4) dans le moule creux.
EP98914834A 1997-03-12 1998-03-09 Haut-parleur et procede de production d'un haut-parleur Expired - Lifetime EP0966862B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19711982 1997-03-12
DE19711982 1997-03-12
PCT/DE1998/000687 WO1998041055A2 (fr) 1997-03-12 1998-03-09 Haut-parleur et procede de production d'un haut-parleur

Publications (2)

Publication Number Publication Date
EP0966862A2 EP0966862A2 (fr) 1999-12-29
EP0966862B1 true EP0966862B1 (fr) 2002-07-03

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Application Number Title Priority Date Filing Date
EP98914834A Expired - Lifetime EP0966862B1 (fr) 1997-03-12 1998-03-09 Haut-parleur et procede de production d'un haut-parleur

Country Status (4)

Country Link
US (2) US6332508B1 (fr)
EP (1) EP0966862B1 (fr)
DE (1) DE59804667D1 (fr)
WO (1) WO1998041055A2 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2377849A (en) * 2001-07-21 2003-01-22 Kh Technology Corp Loudspeaker drive units with smooth transition to surround
US20070240308A1 (en) * 2005-05-02 2007-10-18 Hutchinson David F Method and system for vibration dampening
JP4059265B2 (ja) * 2005-06-08 2008-03-12 オンキヨー株式会社 スピーカー用部材およびその製造方法
US7699139B2 (en) * 2007-05-31 2010-04-20 Bose Corporation Diaphragm surround
US8397861B1 (en) 2012-03-02 2013-03-19 Bose Corporation Diaphragm surround

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3858680A (en) * 1971-05-28 1975-01-07 Matsushita Electric Ind Co Ltd Vibration diaphragm and cfne edge of a loudspeaker
GB1563511A (en) * 1976-03-19 1980-03-26 Harwood H Diaphragms for electroacoustic transducers
DE3511954C2 (de) * 1985-04-02 1993-10-28 Polynorm Bv Verfahren und Vorrichtung zur Herstellung von Formpreßteilen, die an mindestens einem Rand mit einem thermoplastischen Randstreifen, insbesondere einer Dichtlippe od.dgl. verbunden sind
DE4111748A1 (de) * 1991-04-11 1992-10-15 Nokia Deutschland Gmbh Lautsprecher mit sicke und (einbauab-) dichtung vereinigenden bauteil
DE4116819A1 (de) * 1991-05-23 1992-11-26 Nokia Deutschland Gmbh Staubschutzkalotte fuer konuslautsprecher
WO1993014608A1 (fr) 1992-01-15 1993-07-22 Patrick Arthur Leach Procede et appareil pour realiser un cone de haut-parleur avec sa bordure
FR2697263B1 (fr) * 1993-03-19 1994-12-02 Tao Nguyen Van Adhésif pulvérisable à base de bloc copolymères styréniques linéaires hydrogénés.
JPH0715793A (ja) 1993-06-28 1995-01-17 Sony Corp スピーカ用振動板及びその成形方法
EP0942625A3 (fr) * 1993-06-28 2002-05-15 Matsushita Electric Industrial Co., Ltd. Procédé pour la fabrication de pièces moulées intégrales de membrane-suspension pour haut-parleurs
US5650105A (en) * 1994-05-24 1997-07-22 Yocum; Fred D. Method for making a loudspeaker cone with an integral surround
JP3905652B2 (ja) * 1998-10-07 2007-04-18 フォスター電機株式会社 電気音響変換器用振動板の製造方法

Also Published As

Publication number Publication date
US6347683B2 (en) 2002-02-19
EP0966862A2 (fr) 1999-12-29
US20010022250A1 (en) 2001-09-20
WO1998041055A2 (fr) 1998-09-17
DE59804667D1 (de) 2002-08-08
US6332508B1 (en) 2001-12-25
WO1998041055A3 (fr) 1998-12-03

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