EP0687128A1 - Bobine mobile et méthode pour sa fabrication - Google Patents

Bobine mobile et méthode pour sa fabrication Download PDF

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Publication number
EP0687128A1
EP0687128A1 EP95107541A EP95107541A EP0687128A1 EP 0687128 A1 EP0687128 A1 EP 0687128A1 EP 95107541 A EP95107541 A EP 95107541A EP 95107541 A EP95107541 A EP 95107541A EP 0687128 A1 EP0687128 A1 EP 0687128A1
Authority
EP
European Patent Office
Prior art keywords
voice coil
coil
wire
voice
ultrasonic welding
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
EP95107541A
Other languages
German (de)
English (en)
Other versions
EP0687128B1 (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
Nokia Technology 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 Nokia Technology GmbH filed Critical Nokia Technology 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; DEAF-AID SETS; 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 loudspeakers, in particular with the high-temperature-resistant connection of the individual wire turns of the voice coil to one another or to a voice coil former.
  • voice coils are generally formed by loudspeakers in such a way that a metallic coil wire, usually made of copper, is first coated with an insulating layer and then with a layer of baked enamel before this wire is wound around a carrier to form the voice coil.
  • the carrier can be a so-called voice coil carrier, which, if it is provided with the voice coil, is connected to the loudspeaker membrane. If the formation of a voice coil carrier-free voice coil is desired, the carrier has only the function of a winding mandrel, from which the voice coil is pulled off after its manufacture and is connected as such to the loudspeaker membrane.
  • Both versions have in common that, when the turns are wound around the corresponding carrier, they are subjected to a temperature process in order to establish a connection of the turns to one another and / or the voice coil carrier.
  • This temperature process can be designed so that a pre-fixation is first achieved by means of a surge of current through the coil winding and then the voice coil is subjected to an annealing process in order to produce the final strength of the connection produced via the baking varnish. If the coil winding wound around the respective carrier already has sufficient stability, the pre-fixation by the current surge can also be omitted before the tempering process is carried out.
  • the invention is therefore based on the object of specifying a voice coil which is temperature-stable up to approximately 400 degrees Celsius, and of specifying a manufacturing method for voice coils, according to which high-temperature-resistant voice coils can be formed quickly and less energy-intensively.
  • the insulating layer of the voice coil wire which is also known from the prior art, is formed from a high-temperature-resistant polymer material and if the regions of the insulating layers of the different turns of the voice coil that are in contact with one another are ultrasonically welded, a high-temperature-resistant connection of the turns of the voice coil is given without that a further coating of the insulation of the voice coil wire with baking lacquer is necessary.
  • the insulation can also be used to connect the voice coil to the voice coil former without the voice coil former having a special coating for producing the connection.
  • the voice coil former is also coated with a high-temperature-resistant polymer material, at least in the area that is provided with the turns of the voice coil, the voice coil wires with the voice coil former can be particularly strong and high-temperature resistant (up to about 400 degrees) using ultrasonic welding technology Celsius).
  • the coating of voice coil wire and / or voice coil carriers is formed from an amide-imide polymer material.
  • voice coils are to be formed which have a voice coil former, it is necessary to slide a voice coil former onto the winding mandrel before the winding is carried out.
  • a particularly good and high-temperature resistant connection between the voice coil wire and the voice coil former is achieved if at least the area of the voice coil former which is wound with the voice coil wire is coated with a high-temperature resistant polymer material.
  • the voice coil bobbins which are used in the baking varnish technique can have a baking varnish coating.
  • FIG. 1 shows a section through a voice coil bobbin 10 transverse to the speaker axis 11 running perpendicular to the paper plane.
  • This voice coil former is tubular and in the present case is made of aluminum.
  • the feasibility of the invention is neither restricted to the use of a voice coil bobbin 10 nor to the use of aluminum as a material for the voice coil bobbin 10.
  • the applicability of the arrangements formed according to the invention is also not restricted to applications in which temperatures of over 150 degrees Celsius are predominant.
  • the voice coil wire 13 which forms the voice coil 14 (not shown in FIG. 1) of the loudspeaker, is wound around the outer jacket 12 of the voice coil support 10. It can be clearly seen from the exemplary embodiment shown in FIG. 1 that the voice coil wire 13 is wound in two layers around the outer jacket 12 of the voice coil former 10.
  • the voice coil wire 13 which in the present case is made of Copper is formed, has a diameter D of about 250 microns and is coated with an insulating layer 15.
  • the thickness d of this insulating layer 15 is approximately 50 ⁇ m.
  • this insulating layer is formed from a high-temperature-resistant amide-imide-polymer material.
  • the outer jacket 12 of the voice coil former 10 is also coated with this amide-imide polymer material, which is stable up to a temperature of approximately 400 degrees Celsius.
  • This insulating layer, designated 16, is formed only in the area on the outer jacket 12 of the voice coil bobbin 10, which is covered by the voice coil wires 13 or the voice coil 14, and also has a thickness of 50 ⁇ m.
  • Figure 1 which shows the voice coil bobbin 10 in the wound state, makes it clear that after the voice coil bobbin 13 is wound around the voice coil bobbin 10, the insulating layers 15, 16 lie against each other.
  • the insulating layers 15, 16 are ultrasonically welded to one another.
  • the thickness d of the insulating layer 15 and the insulating layer 16 should not be less than 20 ⁇ m.
  • the connection process of the voice coil support 10 and the wound voice coil 14 is shown in more detail in FIG.
  • the tubular voice coil former 10 is inserted into a holder 17.
  • This holder encases the outer jacket 12 of the voice coil former 10 to a narrow area 18.
  • This area 18, which does not cover the outer jacket 12 of the voice coil bobbin 10, is wound with the coil wires 13 forming the voice coil 14.
  • the holder 17 can be connected to the voice coil former 10 already during the winding of the coil wire 13.
  • the narrow region 18 can be used to limit the winding width B of the voice coil 14 on the outer jacket 12 of the voice coil former 10.
  • a winding mandrel (not shown in FIG. 2) can also fill the inner cross-section of the voice coil bobbin 10 while the coil wire 13 is being wound around the outer jacket 12.
  • the winding mandrel (if it is present) is first removed and replaced by an electrode 19 of the ultrasonic welding arrangement, which also fills the inner cross section of the voice coil bobbin 10, and advanced in the direction of arrow P1 to the position indicated by the dashed line is indicated. It is obvious that the use of an independent winding mandrel can be dispensed with if the electrode 19 is already inserted into the inner cross section of the voice coil former 10 during the winding of the coil wire 13. In this case, the electrode 19 takes over the function of the winding mandrel.
  • the electrode provided with the reference number 19 in FIG. 2 forms the so-called sonotrode of the ultrasonic welding arrangement.
  • the insulating layers 15, 16 (FIG. 1) of the voice coil support 10 and the voice coil wire 13 are then ultrasonically welded to one another by means of the ultrasound welding arrangement formed from the electrode 19 and the counterelectrode 20.
  • the front part 17.1 of the holder 17 can be removed in the direction of arrow P3 and the voice coil 14 connected to the voice coil bobbin 10 can be removed from the arrangement in the direction of arrow P3 after the segments of the counter electrode 20 in the direction of arrow P2 the voice coil 14 were lifted off.
  • this method can also be used to form a carrier-coil combination in which the voice coil carrier 10 itself does not have an independent insulating layer 16.
  • the area of the outer sheath 12 which is occupied by the voice coil 14 should be roughened. If the voice coil bobbin 10 itself has no additional coating, ie if the insulated coil wire 13 is wound directly around the outer jacket 12 of the voice coil bobbin 10, the thickness D of the insulating layer 15 should be at least 20 ⁇ m.
  • FIG. 3 shows an arrangement for forming so-called voice coils 14.1 which are free of voice coil carriers.
  • voice coils 14.1 are understood to mean those in which the wound coil wires 13 forming the voice coil 14.1 are connected to one another without the presence of a voice coil support 10 and as such are connected to the loudspeaker membrane (not shown).
  • voice coils 14.1 always requires a winding mandrel around the outer jacket of which the voice coil wires 13 are wound.
  • the function of the winding mandrel is formed by the electrode 19 of the ultrasonic welding arrangement.
  • the electrode 19 can be removed from a holder 17 be surrounded. The latter is indicated by the dashed outline.
  • a strapless voice coil 14.1 is connected to the arrangement according to FIG. 3 in such a way that the voice coil wires 13 discussed in connection with FIG. 1 are wound around the outer jacket 21 of the electrode 19.
  • the area of the electrode 19 which is occupied by the voice coil 14.1 should be of very smooth-walled design and / or be coated with a release agent in order to prevent the insulation 15 from being connected to the outer jacket 21 of the electrode 19 during the welding process.
  • the strapless voice coil 14.1 can be removed from the electrode 19 in the direction of the arrow P3 after the Segments of the counter electrode 20 were lifted from the voice coil 14.1 and the front part 17.1 of the holder 17 was removed.
  • the electrode 19 forms the sonotrode of the ultrasonic welding arrangement.

Landscapes

  • 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)
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
DE4419252A DE4419252A1 (de) 1994-06-01 1994-06-01 Schwingspule und Verfahren zu ihrer Herstellung
DE4419252 1994-06-01

Publications (2)

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

Citations (5)

* 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
EP0112559A1 (fr) * 1982-12-24 1984-07-04 International Standard Electric Corporation Haut-parleur
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
US5027412A (en) * 1985-10-11 1991-06-25 Pioneer Electronic Corporation Voice coil with rectangular coil wire and foil leads
US5091028A (en) * 1985-03-30 1992-02-25 Totoku Electric Co., Ltd. Method for manufacturing a heat resistant voice coil

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4048713A (en) * 1975-06-09 1977-09-20 Mogens Hvass Method of making compact electric coils
DE3635152A1 (de) * 1986-10-15 1988-04-21 Hoegl Helmut Elektromagnetische anordnung, insbesondere elektromagnetische wicklung

Patent Citations (5)

* 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
EP0112559A1 (fr) * 1982-12-24 1984-07-04 International Standard Electric Corporation Haut-parleur
US5091028A (en) * 1985-03-30 1992-02-25 Totoku Electric Co., Ltd. Method for manufacturing a heat resistant voice coil
US5027412A (en) * 1985-10-11 1991-06-25 Pioneer Electronic Corporation Voice coil with rectangular coil wire and foil leads
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

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 15, no. 54 (E - 1031) 8 February 1991 (1991-02-08) *

Also Published As

Publication number Publication date
EP0687128B1 (fr) 2000-04-19
JPH0847088A (ja) 1996-02-16
DE4419252A1 (de) 1995-12-07
ATE192010T1 (de) 2000-05-15
DE59508182D1 (de) 2000-05-25

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