EP0814637A2 - Procédé de fabriction d'un diaphragme pour transducteur électro-acoustique - Google Patents

Procédé de fabriction d'un diaphragme pour transducteur électro-acoustique Download PDF

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Publication number
EP0814637A2
EP0814637A2 EP97890105A EP97890105A EP0814637A2 EP 0814637 A2 EP0814637 A2 EP 0814637A2 EP 97890105 A EP97890105 A EP 97890105A EP 97890105 A EP97890105 A EP 97890105A EP 0814637 A2 EP0814637 A2 EP 0814637A2
Authority
EP
European Patent Office
Prior art keywords
membrane
thickness
area
dome
fixing device
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
EP97890105A
Other languages
German (de)
English (en)
Other versions
EP0814637A3 (fr
EP0814637B1 (fr
Inventor
Gino Dipl.Ing. Pavlovic
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.)
AKG Acoustics GmbH
Original Assignee
AKG Acoustics GmbH
AKG Akustische und Kino Geraete 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 AKG Acoustics GmbH, AKG Akustische und Kino Geraete GmbH filed Critical AKG Acoustics GmbH
Priority to AT97890105T priority Critical patent/ATE309686T1/de
Publication of EP0814637A2 publication Critical patent/EP0814637A2/fr
Publication of EP0814637A3 publication Critical patent/EP0814637A3/fr
Application granted granted Critical
Publication of EP0814637B1 publication Critical patent/EP0814637B1/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
    • H04R31/00—Apparatus or processes specially adapted for the manufacture of transducers or diaphragms therefor
    • H04R31/003—Apparatus or processes specially adapted for the manufacture of transducers or diaphragms therefor for diaphragms or their outer suspension
    • 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
    • H04R5/00—Stereophonic arrangements
    • H04R5/033—Headphones for stereophonic communication
    • 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
    • H04R9/06—Loudspeakers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/49005—Acoustic transducer
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/4902—Electromagnet, transformer or inductor
    • Y10T29/4908—Acoustic transducer

Definitions

  • the invention relates to a method for producing a membrane with different thickness partial areas from a thermoplastic deformable material of constant thickness for an electroacoustic transducer, which works according to the electrodynamic principle.
  • the behavior of the membrane is of particular importance for the functioning of every electroacoustic transducer, since it plays a key role in determining the transducer transmission characteristics.
  • the behavior of the membrane depends not only on the material properties but also very much on its shape.
  • a membrane shape has generally proven itself, as is shown schematically in FIG. 1.
  • the center of the membrane is dome-shaped and surrounded by a toroidal part, which is followed by an edge for attachment to the magnet system.
  • the moving coil which moves in a radial magnetic field, is attached below the dome.
  • the aim of all constructive measures is to achieve a piston-shaped movement of the moving coil at all frequencies and amplitudes.
  • the central dome should be made as stiff as possible in order to prevent the occurrence of vibration modes even at high frequencies, which would otherwise lead to drops in the frequency response.
  • the toroidal part is decisive for the suspension and is often tangential to the inside diameter Provide depressions, the so-called beads. Therefore, the term "beading zone" has generally been used for this part. The softer this bead zone is, the better the sensitivity will be in the low-frequency transmission range.
  • the membrane material which is usually in the form of a film, is pressed into an embossing mold with the application of pressure and heat. After a cooling phase, the film is removed and then the final membrane is punched out. With this type of production - apart from the shape - no distinction is made between the dome zone and the bead zone.
  • stiffening of the dome zone can be achieved by applying a second layer.
  • proposed in EP 0 446 515 A2 to even provide the concave side of the dome with a metal mesh.
  • central dome part Another possibility to increase the stiffness of the central dome part is by a special shape of this part, e.g. through a central depression, as can be seen from FIG. 1 of EP 0 137 624 A2.
  • DE 43 29 637 A1 describes the formation of ribs.
  • the central dome part is first made larger than desired and then provided in a second deformation process with randomly occurring stiffening ribs.
  • the methods mentioned are time-consuming and therefore costly.
  • the present invention has set itself the goal of avoiding these disadvantages and of providing a simple, precisely definable production method for membranes with sub-regions of different thicknesses which can be used advantageously for electrodynamic transducers.
  • the membrane with different thickness partial areas is produced from a material of constant thickness by a multi-stage thermoplastic embossing process.
  • a first operation that area of the membrane material which is to have a greater thickness in the finished membrane is held by an inner fixing device, while the remaining area is additionally held by an outer fixing device and is drawn to a smaller thickness under the action of tension and heat becomes.
  • a second step the entire membrane is embossed in one mold.
  • the dome is embossed from the fixed area of the membrane material and the bead zone from the remaining preferred area of the membrane material.
  • FIG. 1 shows in cross section the complete membrane with plunger coil for an electrodynamic transducer
  • FIG. 2 shows schematically the inner and outer fixing device with the inserted membrane material
  • 4 shows in cross section the preferred membrane material with the much thicker central part
  • FIG. 5 shows the finished membrane of an electrodynamic transducer according to the invention in cross section.
  • Fig. 1 shows the sectional view of a complete membrane with the moving coil for an electrodynamic converter.
  • the central dome area 1 is surrounded by a toroidal part 2.
  • the outer membrane edge 3 is used for attachment to the magnet system (not shown).
  • the moving coil 4 is glued to the membrane.
  • the diameter of the moving coil 4 corresponds approximately to the outer diameter of the central dome area 1.
  • the outer fixing device 7, 7 ' encloses an area which corresponds approximately to twice the diameter of the membrane that has been produced.
  • the fixing devices each consist of two jaws 6, 6 'and 7, 7', which are arranged above and below the membrane material 5. These two jaws 6, 6 'and 7, 7' are pressed together so tightly that the membrane material 5 in between is held firmly. In order to prevent the membrane material from being damaged during fixation, the two jaws can additionally be provided with elastic sealing elements 12, 12 'and 13, 13'.
  • the annular edge region 9 between the inner 6, 6 'and outer 7, 7' fixing device can be reduced in thickness, as shown in FIG. 3 is shown schematically.
  • the heat necessary for pulling forward the membrane material 5 can be supplied by air or by radiation.
  • the membrane material 5 is heated directly with warm air, in the second case surrounding parts, for example the massive parts of the fixing devices, are heated electrically and in turn irradiate the membrane material 5.
  • FIG. 4 shows the result of this first operation, namely a membrane film that is thicker in its central area 8 than in its edge area 9.
  • this film is then embossed and punched out using a conventional membrane shape.
  • Fig. 5 shows a finished punched membrane, the dome 10 is much thicker than the bead zone 11. Thickness differences between the dome and the bead zone of approx. 50% could be realized in this way.
  • the outer and inner fixing device and the final embossing mold can be combined with one another and arranged to be axially movable relative to one another, so that the manufacturing method according to the invention can run automatically by means of a suitable control device.
  • membranes for electroacoustic transducers can be produced inexpensively, which have a thick dome zone and a thinner bead zone, which significantly improves their vibration behavior.
EP97890105A 1996-06-19 1997-06-18 Procédé de fabrication d'un diaphragme pour transducteur électro-acoustique Expired - Lifetime EP0814637B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT97890105T ATE309686T1 (de) 1996-06-19 1997-06-18 Verfahren zur herstellung einer membrane für einen elektroakustischen wandler

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
AT0108596A AT403751B (de) 1996-06-19 1996-06-19 Verfahren zur herstellung einer membran für einen elektroakustischen wandler
AT1085/96 1996-06-19
AT108596 1996-06-19

Publications (3)

Publication Number Publication Date
EP0814637A2 true EP0814637A2 (fr) 1997-12-29
EP0814637A3 EP0814637A3 (fr) 2004-09-15
EP0814637B1 EP0814637B1 (fr) 2005-11-09

Family

ID=3506264

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97890105A Expired - Lifetime EP0814637B1 (fr) 1996-06-19 1997-06-18 Procédé de fabrication d'un diaphragme pour transducteur électro-acoustique

Country Status (6)

Country Link
US (1) US6185809B1 (fr)
EP (1) EP0814637B1 (fr)
JP (1) JP3927651B2 (fr)
AT (2) AT403751B (fr)
DE (1) DE59712472D1 (fr)
DK (1) DK0814637T3 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1207719A2 (fr) 2000-11-20 2002-05-22 Matsushita Electric Industrial Co., Ltd. Haut-parleur,diaphragm et procédé de fabrication du dit diaphragm
CN1596032B (zh) * 2003-09-11 2011-05-11 Akg声学有限公司 动态转换器

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3597061B2 (ja) * 1998-11-13 2004-12-02 日本電気株式会社 圧電スピーカ
KR100338785B1 (ko) * 1999-05-28 2002-05-31 허 훈 휴대폰의 다이내믹 리시버용 다이아프램의 제조방법
JP2007522756A (ja) 2004-02-17 2007-08-09 コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ 電気音響トランスジューサ用の膜体の特性を変更する方法及び装置
EP1694094A1 (fr) 2005-02-18 2006-08-23 AKG Acoustics GmbH Membrane pour convertisseur dynamique
US20070261912A1 (en) * 2006-05-11 2007-11-15 Altec Lansing Technologies, Inc. Integrated audio speaker surround
CN102868959B (zh) * 2012-10-12 2015-01-21 张百良 铝带扬声器

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1277023A (en) * 1968-08-27 1972-06-07 Emi Ltd Improvements in or relating to diaphragms
DE2238831A1 (de) * 1971-08-11 1973-02-22 Shell Int Research Thermoplast-hohlformteil und verfahren zu seiner herstellung

Family Cites Families (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1219918A (en) * 1968-08-08 1971-01-20 Standard Telephones Cables Ltd Improvements in and relating to moving coil transducers
US3586792A (en) * 1970-02-24 1971-06-22 Int Standard Electric Corp Method for assembling electro-acoustical transducer diaphragm assemblies
JPS53119023A (en) * 1977-03-26 1978-10-18 Kenzou Inoue Moving coil type sound converting vibration plate
JPS555168A (en) * 1978-06-27 1980-01-16 Matsushita Electric Ind Co Ltd Production of diaphragm for speaker
GB2062405B (en) * 1979-10-20 1983-07-20 Plessey Co Ltd Acoustic transducer production for telephones
US5033093A (en) 1990-01-17 1991-07-16 Peavey Electronics Corporation Compact microphone and method of manufacture
JPS56141697A (en) * 1980-04-08 1981-11-05 Mitsubishi Electric Corp Preparation of vibration diaphragm for speaker
JPS58157294A (ja) * 1982-03-15 1983-09-19 Mitsubishi Electric Corp スピ−カ用振動板
JPS58157293A (ja) * 1982-03-15 1983-09-19 Mitsubishi Electric Corp スピ−カ用振動板
JPS5927697A (ja) * 1982-08-04 1984-02-14 Sanyo Electric Co Ltd スピ−カ振動板とエツジとの接合方法
JPS59190799A (ja) * 1983-04-14 1984-10-29 Onkyo Corp 振動板エツジの取付法
GB2145300B (en) 1983-08-16 1987-05-07 Standard Telephones Cables Ltd Electroacoustic transducer
NL8501650A (nl) 1985-06-07 1987-01-02 Philips Nv Elektrodynamische omzetter met een tweedelig membraan.
EP0305540B1 (fr) * 1987-03-04 1994-11-23 Hosiden Corporation Unite de diaphragame d'un microphone a condensateur, procede de production, et microphone a condensateur
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
DE4329637A1 (de) 1993-09-02 1995-03-09 Sennheiser Electronic Verfahren zum Herstellen einer profilierten Membran für elektro-akustische Wandler, wie Kopfhörer sowie nach diesem Verfahren hergestellte Wandlermembran

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1277023A (en) * 1968-08-27 1972-06-07 Emi Ltd Improvements in or relating to diaphragms
DE2238831A1 (de) * 1971-08-11 1973-02-22 Shell Int Research Thermoplast-hohlformteil und verfahren zu seiner herstellung

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1207719A2 (fr) 2000-11-20 2002-05-22 Matsushita Electric Industrial Co., Ltd. Haut-parleur,diaphragm et procédé de fabrication du dit diaphragm
EP1207719A3 (fr) * 2000-11-20 2006-11-02 Matsushita Electric Industrial Co., Ltd. Haut-parleur,diaphragm et procédé de fabrication du dit diaphragm
CN1596032B (zh) * 2003-09-11 2011-05-11 Akg声学有限公司 动态转换器

Also Published As

Publication number Publication date
DK0814637T3 (da) 2006-03-20
DE59712472D1 (de) 2005-12-15
ATE309686T1 (de) 2005-11-15
EP0814637A3 (fr) 2004-09-15
EP0814637B1 (fr) 2005-11-09
AT403751B (de) 1998-05-25
JPH1070794A (ja) 1998-03-10
US6185809B1 (en) 2001-02-13
JP3927651B2 (ja) 2007-06-13
ATA108596A (de) 1997-09-15

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