EP0966862A2 - Haut-parleur et procede de production d'un haut-parleur - Google Patents

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

Info

Publication number
EP0966862A2
EP0966862A2 EP98914834A EP98914834A EP0966862A2 EP 0966862 A2 EP0966862 A2 EP 0966862A2 EP 98914834 A EP98914834 A EP 98914834A EP 98914834 A EP98914834 A EP 98914834A EP 0966862 A2 EP0966862 A2 EP 0966862A2
Authority
EP
European Patent Office
Prior art keywords
bead
cone
loudspeaker
polyurethane
negative mold
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
EP98914834A
Other languages
German (de)
English (en)
Other versions
EP0966862B1 (fr
Inventor
Siegfried Schriever
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.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of EP0966862A2 publication Critical patent/EP0966862A2/fr
Application granted granted Critical
Publication of EP0966862B1 publication Critical patent/EP0966862B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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 and a method for producing such a loudspeaker.
  • Loudspeakers of the aforementioned type are dynamic loudspeakers in which a voice coil moves within the magnetic field of a permanent magnet due to electrical signals.
  • a cone connected to the coil starts to move and generates sound waves.
  • the cone thus sets the surrounding air in a movement that is as equivalent as possible to the electrical signal, whereby no audible natural vibrations of the cone should occur.
  • the cone must therefore have a high internal damping. Therefore, in the prior art, a fibrous paper mixture, plastic, metal foam or metal, preferably in a honeycomb structure, is used as the material of the cone.
  • the cone can move as freely as possible, it is necessary to carry the outer end of the cone with it to connect a speaker cage with the help of a bead that holds the cone in its specified direction of movement with the most constant possible spring action.
  • the bead is made of rubber, foam or coated fabric.
  • EP 0 552 040 B1 discloses a loudspeaker with a cone, which is made of hard polypropylene.
  • the bead connected to the cone on the other hand, is made of a soft polymer material, so that the different requirements regarding the hardness of the material of the cone on the one hand and of the bead on the other hand are guaranteed.
  • the cone is placed or clamped in the mold in a first step, after which elastomeric material is injected into the mold. It is also disclosed that first the cone is made by injecting a polypropylene material and then the bead is made by injecting elastomeric material.
  • a loudspeaker is also known from EP 0 632 674 A1, the cone of which is made of polypropylene and the bead and the associated support part as a seal made of a thermoplastic synthetic resin.
  • a dicromatic casting mold is used for the production, in which in a first process step the cone is made of polypropylene in a casting mold.
  • the bead and the supporting part with a seal are produced from the thermoplastic synthetic resin in the mold by injection. During the hardening of the materials, they connect to each other at the specified seams, so that a permanent connection is created.
  • a method for producing and using a sprayable polyurethane material is known from EP 0 379 246 B1.
  • a two-component polyurethane reaction mixture is produced, which is sprayed onto a surface of a negative mold using a spray gun to produce a film in a homogeneous thickness.
  • the spray gun has a nozzle for each component through which the respective component exits.
  • the properties of the sprayed polyurethane layer can be adjusted in a variable manner.
  • the hardness of the polyurethane film can thus be set within wide limits.
  • the method described in EP 0 379 246 B1 is used in particular for the manufacture of fittings in the manufacture of motor vehicles.
  • the present invention is based on the technical problem of specifying a loudspeaker and a method for producing a loudspeaker in which the disadvantages of the prior art described above are avoided.
  • the technical problem outlined above is solved by a loudspeaker with a cone and with a bead connected to the cone, in which the bead consists of an injectable plastic layer that is soft in the solidified state.
  • the bead consists of an injectable plastic layer that is soft in the solidified state.
  • the plastic layer consists of a thermoplastic material.
  • the elasticity of the bead can be adjusted very precisely according to the invention by adjusting the amounts of the components of the polyurethane layer.
  • the bead preferably contains one or more of the substances polyurethane, polypropylene, polyvinyl chloride or polyethylene. Because of the type purity, the bead is preferably made of a polyurethane layer.
  • the cone also consists of the same material as the bead, in the particularly preferred embodiment of a polyurethane layer, which, however, is hard in contrast to the bead and has a suitable stiffness in order to meet the requirements for sound generation by the loudspeaker. If both the cone and the corrugation consist of a polyurethane layer, this further advantageously results in a further increased purity of the components of the loudspeaker, so that later disposal or recycling is simplified.
  • the manufacturing process described below ensures that a material connection between the cone and the bead is produced, as a result of which the use of adhesives is advantageously avoided.
  • Another advantage results from the fact that a seal is provided which is fastened to the bead, preferably also a material connection between the bead and the seal being provided.
  • a method for producing a loudspeaker in which an open negative mold is used which specifies the shape of the loudspeaker consisting of cone and bead.
  • the cone which has been manufactured beforehand and can be made of the known materials, is placed in the negative form and fixed in its correct position.
  • an injectable plastic is sprayed into the open negative mold, one being Beading is formed in the form of a soft plastic layer that connects to the cone.
  • a thermoplastic can be used.
  • the elasticity of the bead can be set very precisely by suitable selection of the mixing ratio of the two components, depending on the shape, size and performance requirements of the loudspeakers.
  • the plastic particularly preferably consists of a two-component polyurethane reaction mixture.
  • the cone is also produced from a polyurethane layer, which, however, has a greater hardness than the bead described above.
  • a two-component polyurethane reaction mixture is also sprayed into the open negative mold and trimmed after curing.
  • the cone and the bead are thus preferably produced in two successive working steps by spraying on a two-component polyurethane reaction mixture in the same negative form. Since the cone and the bead are basically made of the same material with only different hardness, a firm material connection is created between the cone and the bead at the corresponding seam.
  • the cone can be arranged and positioned in the negative mold both before the polyurethane layer is sprayed on to produce the bead and after the spraying. In both cases, a firm connection between the cone and the bead is then produced during the curing of the polyurethane layer without a separate adhesive connection having to be produced.
  • a further improvement of the method according to the invention is achieved in that a sealing ring is inserted into a recess provided in the negative mold before the polyurethane layer is sprayed on to produce the bead.
  • the polyurethane layer is then sprayed onto the negative mold and onto the side of the sealing ring facing the open side of the negative mold, a firm connection between the bead and the sealing ring is produced during the curing of the polyurethane layer.
  • the use of an adhesive can be avoided.
  • the method according to the invention is simplified when using rotationally symmetrical negative molds in that the negative mold is rotated while the polyurethane layer is being sprayed on and the spray head only executes an essentially linear movement.
  • a suitable synchronization between the rotary movement and the linear movement ensures a uniform application of the polyurethane layer, so that the polyurethane layer is as uniform as possible.
  • Adherence to a predetermined layer thickness is also achieved by using a counterform which is adapted to the negative mold and which is applied after spraying on the polyurethane layer in order to produce a precisely defined thickness of the polyurethane layer.
  • a counterform which is adapted to the negative mold and which is applied after spraying on the polyurethane layer in order to produce a precisely defined thickness of the polyurethane layer.
  • the counterform as well as the negative form can be easily removed from the polyurethane layer produced, it is advantageous if the one 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 the release agent can even be dispensed with, at least in the negative mold, if openings are provided in the negative mold through which compressed air is passed in order to facilitate removal from the mold. This ensures in particular that in the areas in which a connection of the polyurethane layer to the seal arranged in a recess of the negative mold is to be created, there is no release agent which can impair such a connection.
  • Fig. 1 is a cone-connected bead, which has been produced on a negative mold and the layer thickness by placing one
  • Fig. 2 shows a second embodiment of a bead connected with a cone, which is connected in the outer region with a seal arranged in the negative form.
  • a loudspeaker which consists of a cone 2 and a bead 4 connected to the cone 2.
  • the bead can, as in the illustrated embodiment, be curved inwards to the loudspeaker.
  • the invention is not limited to loudspeakers with such shaped beads. Rather, beads of the most varied shapes can be produced using the method according to the invention.
  • This connection point 6 is arranged on the inner edge of the bead 4.
  • the bead 4 has a conical part 8, which is essentially aligned with the surface of the cone 2.
  • the bead also has an outer annular part 10, which is used to fasten the unit of bead 4 and cone 2 with a speaker basket, not shown in the drawing.
  • This part 10 can be kept free of release agents by using the method according to the invention and can thus be securely glued to the basket without further preparatory work.
  • the conical part 8 and the ring-shaped part 10 of the bead 4 are connected to one another via an annular section 12 which forms a curve and which forms the actual bead.
  • This elastic section 12 or the corrugation enables a relative movement of the cone 2 with respect to the stationary annular part 10, the elastic properties of the annular part 12 being chosen such that the vibration properties of the cone 2 are influenced only insignificantly.
  • the bead 4 consists of a soft polyurethane layer. This offers the advantage that the elastic properties of the bead can be adjusted very precisely by the mixing ratio of the components of the polyurethane.
  • the cone usually consists of a hard material, such as cardboard, of a metal or of polypropylene, the hardness of the cone 2 being within the given limits due to the material.
  • the cone 2 like the bead 4, consists of a polyurethane, the mixing ratio of the components being selected in the production of the polyurethane layer of the cone 2 such that a harder polyurethane layer than in the bead 4 is formed.
  • both the cone 2 and the bead 4 consist essentially of the same material, which only differs in its hardness property.
  • the bead 4 and the cone 2 overlap at the connection point 6, the cone 2 being integrally connected to the bead 4.
  • the integral connection is created in the manufacturing process, which is described in more detail below.
  • the integral connection has the advantage that no additional adhesive is required to connect the bead 4 to the cone 2. If, in addition, both the cone 2 and the bead 4 consist of a polyurethane layer, a cohesive connection results in a further advantageous manner, which is very reliable since, because of the same basic material of the polyurethane, there is very good crosslinking at the boundary layer between the bead 4 and the cone 2 can arise. Furthermore, both the cone 2 and the bead 4 have approximately the same thermal properties, so that temperature fluctuations to which the loudspeaker is subjected do not lead to a load on the connection point 6 between the cone 2 and the bead 4.
  • a seal 14 is provided which is attached to the outer annular part 10.
  • a material connection between the seal 14 and the bead 4 is produced by applying the polyurethane layer of the bead 4 directly to the surface of the seal 14.
  • an additional adhesive is avoided and a very reliable connection between the bead 4 and the seal 14 is realized.
  • the method according to the invention for producing a loudspeaker is described below.
  • an open negative mold 16 is used, which specifies the shape of the loudspeaker having a cone 2 and a bead 4.
  • the cone 2 is placed in the negative mold 16 and fixed in its exact position.
  • a two-component polyurethane reaction mixture is then sprayed into the open negative mold 16, so that a bead 4 is formed which is connected to the outer edge of the cone 2.
  • the bead 4 has a high elasticity, so the bead 4 consists of a soft polyurethane layer.
  • the two components are warmed up to a temperature at which the components are flowable and can be sprayed onto the negative mold with the aid of a spray gun.
  • the negative mold 16 is also warmed up, so that after spraying the polyurethane layer and the negative mold 16 cool down together and bring about the desired uniform hardening process.
  • the bead 4 connects to the surface of the cone 2 at the connection point 6, so that a material connection is created between the bead 4 and the cone 2.
  • the cone 2 is also formed in the form of a polyurethane layer by spraying a two-component polyurethane reaction mixture into the open negative mold 16.
  • the mixing ratio of the two components of the polyurethane is selected in the manufacture of the cone 2. that a hard polyurethane layer is created that meets the requirements for the vibration behavior of the cone 2.
  • the cone 2 and the bead 4 are also produced from a polyurethane layer, it is advantageous for the cone 2 and the bead 4 to be produced in two successive steps by spraying on a two-component polyurethane reaction mixture in the same negative form become. This has the advantage that the method for producing a loudspeaker has only a few coordinated work steps and can therefore be carried out simply and inexpensively.
  • a further simplification of the method for producing a loudspeaker is that a seal 14 in the form of a sealing ring is inserted into a recess 18 provided in the negative mold 16 before the polyurethane layer 4 is sprayed on.
  • the surface of the seal 14 facing the open side of the negative mold 16 is then covered with the polyurethane layer when the polyurethane is sprayed on.
  • a firm material connection is then formed between the bead 4 and the seal 14, so that an additional adhesive for connecting the seal 14 to the bead 4 can advantageously be dispensed with.
  • the seal 14 then serves to fasten the loudspeaker with the bead 4 to the loudspeaker basket (not shown) to seal the opening of the loudspeaker housing from the interior of the housing in order to prevent the ingress of contaminants or moisture.
  • the rotationally symmetrical negative mold 16 is rotated while the polyurethane layer is being sprayed on, so that it is only necessary to use the spray not shown. head only to an essentially linear movement. By moving the spray head back and forth between two end positions while rotating the rotationally symmetrical negative mold 16, the polyurethane layer is sprayed uniformly onto the negative mold.
  • a counterform 20 is placed on it, as shown in FIG. 1.
  • the counterform 20 extends along the outer portion of the cone 2 over the connection point 6, along the cone-shaped part 8, the annular part 12 and along a portion of the annular part 10 of the bead 4.
  • Thickness is predetermined by the distance between the negative mold 16 and the counter mold 20.
  • the counterform 20 is made of a suitable material with a smooth surface, such as Teflon or silicone rubber.
  • a suitable material such as Teflon or silicone rubber.
  • the surface of the counter mold 20 is provided with a release agent. The release agent then forms a boundary layer between the sprayed-on polyurethane layer and the surface of the counter mold 20.
  • the negative mold 16 can be provided with a release agent.
  • the counter-shape 20 extends 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.
  • the outer region of the annular part 10 remains free of release agents, so that the bead 4 can be glued in this region to a loudspeaker basket or to other loudspeaker parts without a release agent having to be removed before the gluing.
  • This also leads to the fact that the manufacture of the loudspeaker is simplified, since an additional work step for removing the release agent at the adhesive point is avoided.
  • 16 openings are provided in the negative mold, through which compressed air is guided.
  • this trimming process is carried out in the negative mold 16 with the aid of a knife, preferably a circular knife. It is therefore not necessary, after removing the loudspeaker component consisting of the cone 2 and the bead 4, to arrange this component again on a mold and to carry out the trimming process. In the method according to the invention, the entire production of the loudspeaker component consisting of the cone 2 and the bead 4 takes place entirely in the negative mold 16.
  • the method according to the invention for producing a loudspeaker therefore advantageously has only a small one Number of operations, since separate operations for gluing the seal 14 with the bead 4 and the bead 4 with the cone 2 are omitted.
  • tool costs are saved since the entire production process takes place in the negative mold 16. Compared to beads made using the foam embossing process, considerable material savings are also achieved.

Landscapes

  • 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).
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 true EP0966862A2 (fr) 1999-12-29
EP0966862B1 EP0966862B1 (fr) 2002-07-03

Family

ID=7824228

Family Applications (1)

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

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9841055A2 *

Also Published As

Publication number Publication date
US6347683B2 (en) 2002-02-19
US20010022250A1 (en) 2001-09-20
EP0966862B1 (fr) 2002-07-03
WO1998041055A2 (fr) 1998-09-17
DE59804667D1 (de) 2002-08-08
US6332508B1 (en) 2001-12-25
WO1998041055A3 (fr) 1998-12-03

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