EP0687128B1 - Bobine mobile et méthode pour sa fabrication - Google Patents

Bobine mobile et méthode pour sa fabrication Download PDF

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Publication number
EP0687128B1
EP0687128B1 EP95107541A EP95107541A EP0687128B1 EP 0687128 B1 EP0687128 B1 EP 0687128B1 EP 95107541 A EP95107541 A EP 95107541A EP 95107541 A EP95107541 A EP 95107541A EP 0687128 B1 EP0687128 B1 EP 0687128B1
Authority
EP
European Patent Office
Prior art keywords
coil
voice coil
voice
ultrasonic welding
wire
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
EP95107541A
Other languages
German (de)
English (en)
Other versions
EP0687128A1 (fr
Inventor
Stefan Geisenberger
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.)
Harman Audio Electronic Systems GmbH
Original Assignee
Harman Audio Electronic Systems 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
Application filed by Harman Audio Electronic Systems GmbH filed Critical Harman Audio Electronic Systems GmbH
Publication of EP0687128A1 publication Critical patent/EP0687128A1/fr
Application granted granted Critical
Publication of EP0687128B1 publication Critical patent/EP0687128B1/fr
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; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/02—Details
    • H04R9/04—Construction, mounting, or centering of coil
    • H04R9/041—Centering

Definitions

  • the invention is concerned with the production of Voice coils for speakers, especially with the high temperature resistant connection of the individual Wire turns of the voice coil with each other or with a voice coil former.
  • voice coils from Speakers generally formed so that a metallic, mostly made of copper Coil wire first with an insulating layer and then is covered with a layer of baked lacquer before it Wire to form the voice coil around a carrier is wrapped.
  • a so-called voice coil former act who when he provided the voice coil is connected to the speaker diaphragm.
  • the carrier has only that Function of a mandrel, of which the Voice coil pulled after its manufacture and as such is connected to the speaker membrane.
  • Both versions have in common that if the Turns are wound around the corresponding carrier, these are subjected to a temperature process in order to a connection of the turns with each other and / or the Manufacture voice coil former.
  • This Temperature process can be designed so that first by means of a current surge through the Coil winding a pre-fixation is achieved and then to establish the final strength of the via the baked enamel the connection Voice coil is subjected to an annealing process. If the winding around the respective carrier Coil winding already has sufficient stability, can be carried out before the tempering process Pre-fixation by the surge is also eliminated.
  • the invention is based on the object Specify voice coil which is up to about 400 degrees Celsius is temperature stable, as well as a To specify manufacturing processes for voice coils, according to which high temperature resistant voice coils quickly and can be trained less energy-intensive.
  • Is according to claim 1 which also in the prior art known insulating layer of the voice coil wire a high temperature resistant polymer material and are the ones in contact with each other Areas of insulation layers of different Turns of the coil with each other ultrasonically welded, is a high temperature resistant Given the turns of the coil, without a further coating of the insulation of the Voice coil wire with baking varnish is necessary.
  • the insulation can too to connect the coil to the Voice coil former can be used without the Voice coil former has a special coating for Establishes the connection.
  • the voice coil former at least in the area with the turns the coil is also provided with a high temperature resistant polymer material coated, the voice coil wires with the Voice coil former using the Ultrasonic welding technology particularly strong and high temperature resistant (up to about 400 degrees Celsius) connect with each other.
  • a particularly good and high temperature resistant connection between voice coil wire and voice coil former is reached when at least the area of the Voice coil former, which with the Voice coil wire is wound with a high temperature resistant polymer material coated becomes.
  • a baked varnish coating can have even according to the prior art Voice coil former, which is used in baking lacquer technology Find use, a baked varnish coating can have.
  • FIG. 1 is a section through a Voice coil former 10 perpendicular to Paper plane extending speaker axis 11 shown.
  • This voice coil former is tubular and in the present case is made of aluminum.
  • the feasibility the invention neither on the use of a Voice coil former 10 still on the use of Aluminum as a material for the voice coil former 10 is limited.
  • the applicability of the Arrangements formed according to the invention do not Limited applications where temperatures of prevail over 150 degrees Celsius.
  • the voice coil wire 13 which in the present case is made of Copper is formed, has a diameter D of about 250 ⁇ m and has an insulating layer 15 encased.
  • the thickness d of this insulating layer 15 is about 50 ⁇ m.
  • This insulating layer is in the present case from a high temperature resistant Amide-imide polymer material formed. With this up about 400 degrees Celsius temperature resistant
  • the outer jacket 12 is also an amide-imide polymer material of the voice coil bobbin 10 coated. This with 16 designated insulation layer is only in the area the outer jacket 12 of the voice coil bobbin 10 which of the voice coil wires 13 or the coil 14 is covered, and has also a thickness of 50 ⁇ m.
  • Figure 1 which the voice coil former 10 in shows wrapped condition, makes it clear that after the voice coil wire 13 around the voice coil former 10 is wound, the insulating layers 15, 16 lie together. To a high temperature resistant and stable connection of up to this point only wound coil wires 13 with each other and with the To effect voice coil former 10, the Insulating layers 15, 16 with each other ultrasonically welded. To realize the Ultrasonic welding of an embodiment according to the figure 1 and to ensure adequate Insulation of the coil wires 13 after welding should the thickness d of the insulating layer 15 and the Insulating layer 16 is not below 20 microns.
  • the connection process of voice coil former 10 and wound coil 14 is closer in Figure 2 shown.
  • the tubular voice coil former 10 is in a bracket 17 is used.
  • This bracket encased the outer jacket 12 of the voice coil former 10 except for a narrow area 18.
  • the bracket 17 can with the voice coil bobbin 10th already during the winding of the coil wire 13 be connected.
  • the narrow one Area 18 for limiting the winding width B of the Coil 14 on the outer jacket 12 of the Voice coil former 10 can be used.
  • Can too during the winding of the coil wire 13 around the Outer jacket 12 is a mandrel (not in Figure 2 shown) the inner cross section of the Fill in the voice coil bobbin 10.
  • the one with the reference number 19 in FIG. 2 The electrode forms the so-called sonotrode Ultrasonic welding arrangement.
  • the insulating layers 15, 16 (FIG. 1) of voice coil former 10 and voice coil wire 13 by means of the electrode 19 and the Counter electrode 20 formed Ultrasonic welding arrangement with each other ultrasonically welded.
  • Ultrasonic welding arrangement can also be such are used in which the counter electrode 20 is not completely on the surface of the coil 14 is applied and the rotatable sonotrode 19 with velvet the voice coil bobbin 10 and the coil 14 for Welding the coil wires 13 together or with the voice coil bobbin 10 on the counter electrode 20 moved over.
  • the ultrasonic welding process is on an assembly Completed according to Figure 2, for example Front part 17.1 of the holder 17 in the direction of the arrow P3 removed and the with the voice coil bobbin 10th connected coil 14 in the direction of arrow P3 Arrangement can be taken after the segments of the Counter electrode 20 in the direction of arrow P2 from the Coil 14 have been lifted off.
  • Figure 3 is an arrangement for forming so-called voice coil carrier-free coils 14.1 shown. Under such coils 14.1 are understood where the the coil wires 13.1 forming coil wires 13 without the presence of a voice coil former 10 connected with each other and as such with the Speaker membrane (not shown) connected become.
  • connection of a strapless coil 14.1 the arrangement according to Figure 3 is such that those discussed in connection with Figure 1 Voice coil wires 13 around the outer jacket 21 of the Electrode 19 are wound.
  • the area of Electrode 19, which is coated with the coil 14.1 should be very smooth-walled and / or with a release agent to be coated to form a connection the insulation 15 with the outer jacket 21 of the electrode 19 to prevent during the welding process.
  • the electrode 19 are then the segments of the counter electrode 20 on the wound coil 14.1 lowered and the individual coil wires 13 on each other in Touching insulation 15 under the effect of Connected to ultrasonic welding technology strapless coil 14.1 in the direction of arrow P3 the electrode 19 are withdrawn after the Segments of the counter electrode 20 from the coil 14.1 were lifted off and the front part 17.1 of the Bracket 17 has been removed. Also in The embodiment according to FIG. 3 forms the electrode 19 the sonotrode of the ultrasonic welding arrangement.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
  • Pressure Welding/Diffusion-Bonding (AREA)

Claims (8)

  1. Bobine oscillatrice pour haut-parleurs, avec un fil métallique (13), entouré par une couche isolante (15) et dont les enroulements constituant la bobine (14) sont reliés ensemble,
    caractérisé en ce que
    la couche isolante (15) est constituée d'un matériau polymère, résistant aux hautes températures et,
    les enroulements constituant la bobine (14) sont reliés à leurs zones, mises en contact ensemble, de la couche isolante (15) par soudage aux ultrasons des couches isolantes (15).
  2. Bobine oscillatrice selon la revendication 1,
    caractérisée en ce que
    la bobine (14) est enroulée autour d'un support de bobine oscillatrice (10) à forme tubulaire, et
    les couches isolantes (15) des fils de bobine (13) après le soudage aux ultrasons relient simultanément également les fils de bobine (13) au support de bobine oscillatrice (10) .
  3. Bobine oscillatrice selon la revendication 2,
    caractérisée en ce que
    le support de bobine oscillatrice (10) est doté, au moins dans la zone autour de laquelle la bobine (14) est enroulée, d'une couche isolante (16) constituée d'un matériau polymère résistant aux hautes températures.
  4. Bobine oscillatrice selon la revendication 1 ou 3,
    caractérisée en ce que
    la couche isolante (15, 16) du fil de bobine oscillatrice (13) et/ou du support de bobine oscillatrice (10) est constituée d'un matériau polymère imide-amide.
  5. Procédé de fabrication de bobines oscillatrices, caractérisé par
    les étapes ci-après - indiquées dans l'ordre chronologique :
    étape 1 :
    revêtement du fil de bobine métallique (13) avec une couche isolante (15) constituée d'un matériau polymère résistant aux hautes températures ;
    étape 2 :
    enroulement du fil de bobine (13) revêtu, autour d'un mandrin d'enroulement, pour constituer une bobine (14) ;
    étape 3 :
    placement d'une sonotrode (19) et d'une contre-électrode (20) d'un dispositif de soudage par ultrasons dans la zone du mandrin d'enroulement, dans laquelle la bobine (14) est enroulée, la bobine (14) étant disposée entre les électrodes (19, 20) ;
    étape 4 :
    soudage aux ultrasons ensemble des couches isolantes (15) du fil de bobine (13) ; et
    étape 5 :
    extraction des fils de bobine (13) soudées ensemble.
  6. Procédé selon la revendication 5,
    caractérisé en ce que
    le mandrin d'enroulement est constitué par la sonotrode (19) ou la contre-électrode (20) du dispositif de soudage aux ultrasons.
  7. Procédé selon la revendication 5 ou la revendication 6, caractérisé en ce que
    sur le mandrin d'enroulement est enfilé, avant la deuxième étape, un support de bobine oscillatrice (10),
    les couches isolantes (15) des fils de bobine (13) sont reliées ensemble et au support de bobine oscillatrice (10) par le soudage aux ultrasons selon l'étape (4), et
    le support de bobine oscillatrice (10) est extrait du mandrin d'enroulement à l'état relié à la bobine (14).
  8. Procédé selon la revendication 7,
    caractérisé en ce que
    le support de bobine oscillatrice (10) est revêtu, au moins dans la zone qui est enroulée avec le fil de bobine (13), avant revêtement, avec un matériau polymère résistant aux hautes températures.
EP95107541A 1994-06-01 1995-05-18 Bobine mobile et méthode pour sa fabrication Expired - Lifetime EP0687128B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4419252 1994-06-01
DE4419252A DE4419252A1 (de) 1994-06-01 1994-06-01 Schwingspule und Verfahren zu ihrer Herstellung

Publications (2)

Publication Number Publication Date
EP0687128A1 EP0687128A1 (fr) 1995-12-13
EP0687128B1 true EP0687128B1 (fr) 2000-04-19

Family

ID=6519589

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95107541A Expired - Lifetime EP0687128B1 (fr) 1994-06-01 1995-05-18 Bobine mobile et méthode pour sa fabrication

Country Status (4)

Country Link
EP (1) EP0687128B1 (fr)
JP (1) JPH0847088A (fr)
AT (1) ATE192010T1 (fr)
DE (2) DE4419252A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT404206B (de) * 1996-11-20 1998-09-25 Harman Int Ind Verfahren zur herstelllung von spulen

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3963882A (en) * 1975-03-14 1976-06-15 Control Data Corporation Boron or graphite reinforced voice coil and manufacturing process
US4048713A (en) * 1975-06-09 1977-09-20 Mogens Hvass Method of making compact electric coils
DE3247941A1 (de) * 1982-12-24 1984-06-28 Standard Elektrik Lorenz Ag, 7000 Stuttgart Lautsprecher
JPS61226000A (ja) * 1985-03-30 1986-10-07 Totoku Electric Co Ltd 超耐熱ボイスコイルの製造法
US4825533A (en) * 1985-10-11 1989-05-02 Pioneer Electronic Corporation Method of making a voice coil with rectangular coil wire and foil leads
DE3635152A1 (de) * 1986-10-15 1988-04-21 Hoegl Helmut Elektromagnetische anordnung, insbesondere elektromagnetische wicklung
JPH02283200A (ja) * 1989-04-25 1990-11-20 Matsushita Electric Ind Co Ltd スピーカ用ボイスコイルの製造法

Also Published As

Publication number Publication date
EP0687128A1 (fr) 1995-12-13
DE4419252A1 (de) 1995-12-07
ATE192010T1 (de) 2000-05-15
JPH0847088A (ja) 1996-02-16
DE59508182D1 (de) 2000-05-25

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