EP2392151B1 - Bewegliches teil und mit einem solchen beweglichen teil ausgestatteter elektrodynamischer wandler - Google Patents

Bewegliches teil und mit einem solchen beweglichen teil ausgestatteter elektrodynamischer wandler Download PDF

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Publication number
EP2392151B1
EP2392151B1 EP10707594A EP10707594A EP2392151B1 EP 2392151 B1 EP2392151 B1 EP 2392151B1 EP 10707594 A EP10707594 A EP 10707594A EP 10707594 A EP10707594 A EP 10707594A EP 2392151 B1 EP2392151 B1 EP 2392151B1
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EP
European Patent Office
Prior art keywords
mandrel
movable equipment
tube
coil
disc
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.)
Not-in-force
Application number
EP10707594A
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English (en)
French (fr)
Other versions
EP2392151A1 (de
Inventor
Guy Lemarquand
Benoît MERIT
Bernard Nemoff
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.)
Orkidia Audio
Le Mans Universite
University of Maine System
Original Assignee
Orkidia Audio
Le Mans Universite
University of Maine System
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Publication date
Application filed by Orkidia Audio, Le Mans Universite, University of Maine System filed Critical Orkidia Audio
Publication of EP2392151A1 publication Critical patent/EP2392151A1/de
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Publication of EP2392151B1 publication Critical patent/EP2392151B1/de
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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
    • H04R9/045—Mounting

Definitions

  • the present invention is in the field of electromechanics.
  • the invention will find a very particular application, but in no way limiting, within the electrodynamic transducers.
  • electrodynamic transducers are generally used as loudspeakers, geophones and microphones.
  • the present invention relates to a moving element for an electrodynamic transducer, comprising at least one winding support mandrel of at least one coiled wire.
  • an electrodynamic transducer comprises a moving element generally consisting of a coil of copper or aluminum wire wound on a mandrel, the latter being made of a flexible and light material, such as aluminum foil or plastic films. imide-based polymer, such as "KAPTON ®”.
  • a mobile unit comprises a diaphragm, commonly referred to as "membrane”, connected to one end of its mandrel. The latter serves as support for the wire of said coil, is in the form of a cylindrical tube.
  • the coil-mandrel assembly is mounted to move axially in the axial direction of said coil within a so-called "air gap" space traversed by a permanent magnetic field, so that when a current flows through the coil wire, the latter is moves within the gap.
  • this system makes it possible to transform an electric current into mechanical energy, or vice versa.
  • said permanent magnetic field is generated by a magnet.
  • the displacement of the moving element induces vibrations of this diaphragm, generating acoustic waves as a function of the current passing through said coil.
  • a moving element oscillates inside a guiding sheath.
  • the latter presents himself in cylindrical form, surrounding a portion of said moving assembly and within which said magnetic field is generated.
  • the evolution of the technique tends to improve the performance and the dynamic behavior of such a mobile equipment.
  • the mandrel and the membrane are made of the lightest and finest materials possible and are shaped accordingly.
  • the mandrel is in the form of a hollow cylinder at its center on which is wound at the periphery of the wire of said coil.
  • the energy of the eigen modes which is not restored in acoustics is stored during the excitation of the mobile equipment, and then restored as soon as the excitation is stopped, leading to a phenomenon of dragging, to the detriment of the sound quality produced.
  • the design of the bobbin support mandrel often gives rise to a long and hollow part which, on the one hand, generates an overweight and, on the other hand, has vibratory eigen modes in the bandwidth of the electrodynamic transducer.
  • the aim of the invention is to overcome the drawbacks of the state of the art by proposing to make a small-sized mobile assembly for an electrodynamic transducer making it possible to reduce or eliminate the effect of the eigen modes in the bandwidth, while ensuring optimal guidance in the direction along an axis of displacement.
  • the subject of the invention is a mobile equipment for electrodynamic transducer.
  • Such a moving equipment comprises at least one winding support mandrel of at least one wound wire. More particularly said mandrel comprises at least a first internally integral element of at least one second guide element of the moving element within said transducer, said first element constituting, on the one hand, a winding support for said coiled wire of so that the winding is located inside said mandrel and, on the other hand, means for transmitting vibrations, such as a diaphragm, said vibrations being generated by the displacement of the winding induced by the passage of the current inside. wire wound.
  • vibrations such as a diaphragm
  • said first element is a disk while said second element is formed of at least one section tube complementary to the section of said disk, so as to surround said first element and said wound wire around the first element.
  • such a mandrel advantageously has an emitting surface for emitting vibrations directly.
  • the central element also improves the overall rigidity of the mandrel, allowing the use of lighter materials.
  • such a mobile unit makes it possible to improve the linearity of such an acoustic device. It also eliminates a conventional diaphragm in the form of an outer membrane.
  • the confinement of the coil inside the mandrel makes it possible to transmit directly to the mandrel the force resulting from the displacement of the coil.
  • the support element also serving as an emitting surface oscillates exactly like the coil, hence improving the linearity of the response.
  • the known mandrel which was used as coil support is no longer a guiding element of the mobile equipment according to the invention.
  • the mobile equipment according to the invention has self-propagating modes outside the limits of the bandwidth of said electrodynamic transducer.
  • the contact of the coil with the two elements constituting the mandrel according to the invention improves the heat dissipation of the coil during its excitation, limiting its heating and thus helping to avoid the phenomena of compression of the sound emitted by the transducer electrodynamics.
  • the coil transmits its force directly to the first winding support element which has vibration emitting characteristics which by its oscillations generates the sound waves, in particular through its emission surface.
  • this element can also serve as a support for the coil, then wrapped inside the guide element and therefore of such a mandrel.
  • the response of the emission surface is then identical to that of the coil, approaching a perfect acoustic linearity.
  • the invention also relates to an electrodynamic transducer comprising such a moving element, in particular a speaker-type transducer.
  • the present invention relates to a mobile assembly 1 and an electrodynamic transducer equipped with such a moving assembly.
  • such a moving element 1 comprises at least one mandrel 2 supporting winding of at least one wound wire 3.
  • said mandrel 2 consists of one or more elements that may be in the form of a tube, a partially hollow tube, over all or part of its length or section, or a bar, in particular cylindrical. It is intended to receive one or more son 3 wound so as to form a coil.
  • Said mandrel 2 comprises at least a first element 4 for winding said wound wire 3 integral with at least one second element 5 for guiding the moving element 1 within said transducer.
  • the coil is located inside said mandrel 2, supported by the first element 4 and surrounded by the second element 5.
  • a characteristic of the invention consists in the particular joining of said coil to the support element 4 so that it transmits its force directly and without intermediate to said support element 4.
  • said wound wire 3 can be wound within at least one groove 6.
  • the latter is formed at the periphery of said first element 4, in particular at its peripheral edge 7.
  • grooves 6 may extend over all or part of the edge 7 of said first element 4 so as to each receive one or more coiled wires 3.
  • the second element 5 constitutes guide means for the mobile equipment 1 inside the loudspeaker.
  • said second element 5 may consist of a rigid and light material, such as carbon fiber or fiberglass.
  • the guide of the second element 5 can be achieved by means of ferromagnetic liquid for the formation of ferrofluidic joints 8.
  • joints 8 are visible on the figure 2 and are fixedly disposed at the outer wall of said second member 5.
  • Each seal 8 can then be in annular form around said second member 5, surrounding the latter.
  • said first element 4 constitutes oscillation emission means generated by the movement of the coil induced by the passage of the current inside the wound wire 3.
  • the thrust is no longer performed by an intermediate piece as before, but directly, minimizing losses and friction. It can be seen that the invention makes it possible to reject the eigen modes outside the limits of the bandwidth of the electrodynamic transducer.
  • the emitting surface of the support member 4 is formed at least in part by a surface extending orthogonally with respect to the axis of the mandrel 2. In other words, this emitting surface moves in a movement of translation parallel to the axis of the loudspeaker. In other words, this emitting surface is at least partly constituted by the upper face of said first support member 4. Consequently, the latter becomes emitter of sound vibrations, in the manner of a diaphragm.
  • said support-transmitter element 4 can be provided rigid, solid and lightweight, consisting of a multilayer complex, such as carbon foam.
  • said first element 4 may consist of a three-layer complex material, composed in particular of two carbon layers at the center of which extends a film provided with a honeycomb structure.
  • This last layer can be replaced by any other type of porous material used in the design of three-layer material, for example ROHACELL® foam .
  • the winding and emitter support element therefore consists of a solid block, in particular a multilayer, so that it is as rigid as possible so that its eigenfrequencies are as high as possible, while remaining as light as possible. to improve performance.
  • said second element 5 is formed of at least one tube.
  • the first element 4 may be solid, consisting of a bar or a sealing surface of the section of the tube of the second element 5.
  • said first element 4 may consist of a surface closing off the entirety of the inner section of said second element 5.
  • this closure surface may constitute a transmitting surface, which generates acoustic waves.
  • the first element 4 is integral internally with the second element 5.
  • the first 4 and second 5 elements have an identical circular section.
  • the second element 5 is then shaped as a cylinder of revolution while the first element 4 is in the form of a disk. Such a disc is particularly visible on Figures 1 and 2 .
  • said disk and said tube are preferably of cylindrical shape, circular base.
  • the base of the disc may be polygonal, in particular rectangular parallelepiped, while the base of the tube remains circular. Therefore, said tube has an internal space of polygonal section for receiving said disk.
  • said tube has a complementary section to the section of said disk, so as to surround said first element 4 and said wound wire 3 around the first element 4.
  • said disk and said tube are in contact with the winding.
  • the inner surface of the tube therefore conforms to the shape of the support-emitter element 4.
  • the first 4 and second 5 elements are in contact with the coil so as to ideally conduct the heat released by the latter during its excitation, which allows it to keep a reasonable operating temperature to avoid compression phenomena of the sound emitted by the electrodynamic transducer.
  • first 4 and second 5 elements can be made integral with each other at the peripheral edge 7 of said first element 4 by means of suitable fixing means, in particular by gluing. Therefore, the coil is trapped at said edge 7, in particular within the groove 6 of the disc, improving the transmission of its movements to the support member 4 which then becomes, through the direct transmission of the excitation movement coil, vibration emitter, namely a source of acoustic radiation, moving air to create acoustic waves.
  • the already rigid support element 4 is therefore positioned in the guide element 5, the latter alone certainly having uncomfortable eigenfunctions. However, the fact that it is glued to the support element 4 increases its eigenfrequencies.
  • the set of two elements 4 and 5 forming the mandrel 2 constitutes a mobile unit 1 whose natural frequencies are outside the bandwidth of the loudspeaker.
  • said disk may have at least one of its planar, convex or concave bases.
  • the upper base 9 may be provided flat, convex or concave, while the lower base 10 is independently flat, convex or concave. It can also be uniform or have differences in planimetry. According to the embodiment shown on the figure 2 the upper base 9 is flat and the lower base 10 is concave.
  • these different forms of the surface of the bases extend substantially in one or more planes orthogonal to the axis of the mandrel 2.
  • a covering material 11 may consist of a composite, especially a varnish or a film plastic, see carbon fiber.
  • this covering layer 11 on the outer surface of at least one of the bases of said first element 4 may impart impermeability to any type of fluid, especially air.
  • the embodiment of the figure 2 shows an upper face 9 covered with such a material 11.
  • the invention also relates to an electrodynamic transducer, in particular of the loudspeaker type, comprising at least one mobile unit 1 as previously described.
  • An electrodynamic transducer equipped with the mobile assembly according to the invention has the same characteristics as mentioned above.
  • the present invention is part of a context in which the acoustic waves generated by the mobile unit 1 can be guided by the electrodynamic transducer salad bowl.
  • the present invention encloses the coil inside the mandrel 2 to directly transmit the force resulting from the displacement of the coil, in particular to the first coil support element 4.
  • At least one of the faces of the first element 4 constitutes an emitting surface of sound vibrations, such as a diaphragm, transforming the mandrel 2 into a moving element 1, having a diaphragm internally.
  • the invention thus makes it possible to dispense with an external diaphragm in the form of a membrane.
  • a main objective of the invention is that the response of the emitting surface is most in agreement with the behavior of the coil.
  • the contact of the coil with the two elements 4 and 5 constituting the mandrel 2 according to the invention improves the heat dissipation of the coil during its excitation, limiting its heating and therefore, helping to avoid sound compression phenomena emitted by the electrodynamic transducer.
  • the invention offers a better rigidity of the mobile equipment 1, while retaining the lightest materials possible, hence the rise in frequency modes own.
  • the mobile unit 1 according to the invention will find an application in any type of device, not limited to an electrodynamic transducer, in particular of the loudspeaker, geophone or microphone type.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
  • Apparatuses For Generation Of Mechanical Vibrations (AREA)
  • Reciprocating, Oscillating Or Vibrating Motors (AREA)

Claims (8)

  1. Bewegliche Ausrüstung (1) für einen elektrodynamischen Transducer, umfassend zumindest einen Wickeltragkörper (2) zum Tragen von zumindest einem aufgewickelten Spulendraht (3), wobei der besagte Wickeltragkörper (2) zumindest ein erstes Element (4) umfasst, das innerlich mit zumindest einem zweiten Element (5) zum Führen der bewegliche Ausrüstung (1) in dem besagten Transducer, fest verbunden ist, wobei das besagte erste Element (4) einerseits einen Wicklungsträger des besagten, aufgewickelten Spulendrahts (3), derart, dass die Spule sich im Innern des besagten Wickeltragkörpers (2) befindet, sowie andererseits Mittel zur Schwingungsemission wie eine Membran, wobei die besagten Schwingungen durch die Bewegung der Spule erzeugt seien, die durch den Stromdurchfluss durch den Spulendraht (3) veranlasst ist, bildet, dadurch gekennzeichnet, dass das besagte erste Element eine Scheibe ist, während das besagte zweite Element aus zumindest einem Rohr mit einem zum Querschnitt der besagten Scheibe komplementären Querschnitt besteht, derart, um das besagte erste Element (4) und den besagten um das erste Element aufgewickelten (4) Spulendraht (3) zu umhüllen.
  2. Bewegliche Ausrüstung (1) nach Anspruch 1, dadurch gekennzeichnet, dass die besagte Scheibe als ein Zylinder mit einer kreisförmigen Grundfläche ausgestaltet ist, während das besagte Rohr einen zum Drehzylinder komplementären Querschnitt aufweist.
  3. Bewegliche Ausrüstung (1) nach Anspruch 1, dadurch gekennzeichnet, dass die Grundfläche der besagten Scheibe polygonal ist, während die Grundfläche des Rohrs kreisförmig ist, und dadurch, dass das besagte Rohr einen Innenraum mit einem komplementären polygonalen Querschnitt aufweist.
  4. Bewegliche Ausrüstung (1) nach irgendeinem der vorgehenden Ansprüche, dadurch gekennzeichnet, dass die besagte Scheibe zumindest eine Rille (6) zum Wickeln des besagten aufgewickelten Spulendrahts (3) umfasst, wobei die besagte Rille (6) in dem Umkreisbereich des besagten ersten Elements (4) angeordnet sei.
  5. Bewegliche Ausrüstung (1) nach irgendeinem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass die besagte Scheibe und das besagte Rohr mit dem besagten aufgewickelten Spulendraht (3) in Berührung stehen.
  6. Bewegliche Ausrüstung (1) nach irgendeinem der vorgehenden Ansprüche, dadurch gekennzeichnet, dass das besagte erste Element zumindest eine von seinen Grundflächen (4) flach, konvex oder konkav ausgestaltet aufweiset.
  7. Bewegliche Ausrüstung nach irgendeinem der vorgehenden Ansprüche, dadurch gekennzeichnet, dass zumindest die eine von den Grundflächen des besagten ersten Elements (4) mit einem Beschichtungsstoff behandelt ist.
  8. Elektrodynamischer Transducer, insbesondere der Art Lautsprecher, der zumindest eine bewegliche Ausrüstung (1) nach irgendeinem der vorgehenden Ansprüche umfasst.
EP10707594A 2009-02-02 2010-01-27 Bewegliches teil und mit einem solchen beweglichen teil ausgestatteter elektrodynamischer wandler Not-in-force EP2392151B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0950645A FR2941837B1 (fr) 2009-02-02 2009-02-02 Equipage mobile et transducteur electrodynamique pourvu d'un tel equipage mobile.
PCT/FR2010/050121 WO2010086549A1 (fr) 2009-02-02 2010-01-27 Équipage mobile et transducteur électrodynamique pourvu d'un tel équipage mobile

Publications (2)

Publication Number Publication Date
EP2392151A1 EP2392151A1 (de) 2011-12-07
EP2392151B1 true EP2392151B1 (de) 2012-12-05

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EP10707594A Not-in-force EP2392151B1 (de) 2009-02-02 2010-01-27 Bewegliches teil und mit einem solchen beweglichen teil ausgestatteter elektrodynamischer wandler

Country Status (8)

Country Link
US (1) US8934659B2 (de)
EP (1) EP2392151B1 (de)
JP (1) JP5586629B2 (de)
CN (1) CN102301745A (de)
AU (1) AU2010209543A1 (de)
CA (1) CA2751117A1 (de)
FR (1) FR2941837B1 (de)
WO (1) WO2010086549A1 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI538358B (zh) * 2012-04-25 2016-06-11 Yi-Chen Liu Electromagnetic actuated converters that can be adjusted for performance matching

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DK146770C (da) * 1981-11-13 1984-06-04 Brueel & Kjaer As Kapacitiv transducer
DE4419250A1 (de) * 1994-06-01 1995-12-07 Nokia Deutschland Gmbh Schwingspulenträger für Lautsprecher
AT405997B (de) * 1997-04-30 2000-01-25 Akg Acoustics Gmbh Elektroakustischer wandler
JP2001359193A (ja) * 2000-06-16 2001-12-26 Namiki Precision Jewel Co Ltd 電磁誘導型アクチュエータ用ダイアフラム並びにボイスコイルの取付構造
JP2004260347A (ja) * 2003-02-24 2004-09-16 Alps Electric Co Ltd 電気音響変換装置
JP2006005852A (ja) * 2004-06-21 2006-01-05 Pioneer Electronic Corp スピーカー装置
FR2885277B3 (fr) * 2005-04-29 2007-04-20 Merry Electronics Co Ltd Assemblage a tolerance de puissance pour combiner un modulateur sonore et un diaphragme d'un haut-parleur

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
LEMARQUAND GUY ET AL: "Mechanical Properties of Ferrofluids in Loudspeakers", AES CONVENTION 125; OCTOBER 2008, AES, 60 EAST 42ND STREET, ROOM 2520 NEW YORK 10165-2520, USA, 1 October 2008 (2008-10-01), XP040508771 *

Also Published As

Publication number Publication date
AU2010209543A1 (en) 2011-09-15
EP2392151A1 (de) 2011-12-07
FR2941837A1 (fr) 2010-08-06
CA2751117A1 (fr) 2010-08-05
CN102301745A (zh) 2011-12-28
FR2941837B1 (fr) 2016-09-16
US8934659B2 (en) 2015-01-13
WO2010086549A1 (fr) 2010-08-05
US20110286623A1 (en) 2011-11-24
JP2012517134A (ja) 2012-07-26
JP5586629B2 (ja) 2014-09-10

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