EP2392151A1 - Équipage mobile et transducteur électrodynamique pourvu d'un tel équipage mobile - Google Patents
Équipage mobile et transducteur électrodynamique pourvu d'un tel équipage mobileInfo
- Publication number
- EP2392151A1 EP2392151A1 EP10707594A EP10707594A EP2392151A1 EP 2392151 A1 EP2392151 A1 EP 2392151A1 EP 10707594 A EP10707594 A EP 10707594A EP 10707594 A EP10707594 A EP 10707594A EP 2392151 A1 EP2392151 A1 EP 2392151A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- mandrel
- coil
- mobile
- winding
- 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.)
- Granted
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
- 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. polymer based on imides, 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.
- a 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. Namely, 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 coil support mandrel often gives rise to a long and hollow part which, on the one hand, gives rise to an overweight and, on the other hand, has vibratory self-modes. in the bandwidth of the electrodynamic transducer.
- this tube Due to its shape and its positioning, this tube emits no useful acoustic wave, since it "splits" the air in its displacement, but on the other hand it generates parasitic vibrations and, as a connecting tube of the coil with the diaphragm, it has vibratory modes of its own. Only the diaphragm makes the air move in such a crew. Thus, the mandrel serves only as a support and is in no way emitter. Such a mobile team between technical research in the present to control the natural modes of vibration of the coil holder, without being able to eliminate them.
- the aim of the invention is to overcome the drawbacks of the state of the art by proposing to produce a mobile unit with reduced dimensions for an electrodynamic transducer making it possible to reduce or eliminate the eigen modes effect 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 a second guide element of the moving element within said transducer, said first element constituting, on the one hand, a support for winding said wound 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
- Such mandrel advantageously has an emitting surface for emitting vibrations directly.
- the core 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 a coil support is no more than a guiding element of the mobile equipment according to the invention.
- the mobile equipment according to the invention has eigen modes pushed out of bounds 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. Therefore, 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.
- FIG. 1 is a longitudinal sectional view of an embodiment of a moving assembly according to the invention
- - Figure 2 is a view similar to Figure 1 according to another embodiment
- Figure 3 is a view of Figure 1 in cross section along the axis A-A '.
- the present invention relates to a mobile assembly 1 and an electrodynamic transducer equipped with such a moving assembly.
- such a moving assembly 1 comprises at least one mandrel 2 supporting the winding of at least one wound thread 3.
- said mandrel 2 consists of one or more elements that can be presented under the shape 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 feature of the invention consists in the special attachment 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.
- This groove is formed at the periphery of said first element 4, especially at its edge device 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.
- seals 8 are visible in 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 constituted 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. More particularly, said first element 4 may consist of a surface closing off the entirety of the inner section of said second element 5. Moreover, as mentioned above, 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 in FIGS. 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 section complementary to the section of said disk, so as to surround said first element 4 and said wound wire 3 around the first element 4.
- the insertion of the disk of the first element 4 to the inside of the tube of the second element 5 makes it possible to considerably increase the rigidity of the latter, and consequently of the assembly of the mandrel 2 and of the mobile assembly 1, whence the frequencies of the eigen modes which increase.
- 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 in 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.
- At least one of its bases is treated with a covering material 11.
- a covering material 11 may consist of a composite, especially a varnish or a film plastic, see carbon fiber.
- this cover layer 11 on the outer surface of at least one of the bases of said first element 4 can impart impermeability to any type of fluid, especially air.
- FIG. 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 moving equipment according to the invention has the same characteristics as mentioned previously.
- the present invention is set in a context in which the acoustic waves generated by the moving equipment 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 assembly 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 clean.
- 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)
Abstract
Description
Claims
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 true EP2392151A1 (fr) | 2011-12-07 |
EP2392151B1 EP2392151B1 (fr) | 2012-12-05 |
Family
ID=40599993
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP10707594A Not-in-force EP2392151B1 (fr) | 2009-02-02 | 2010-01-27 | Équipage mobile et transducteur électrodynamique pourvu d'un tel équipage mobile |
Country Status (8)
Country | Link |
---|---|
US (1) | US8934659B2 (fr) |
EP (1) | EP2392151B1 (fr) |
JP (1) | JP5586629B2 (fr) |
CN (1) | CN102301745A (fr) |
AU (1) | AU2010209543A1 (fr) |
CA (1) | CA2751117A1 (fr) |
FR (1) | FR2941837B1 (fr) |
WO (1) | WO2010086549A1 (fr) |
Families Citing this family (1)
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)
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 |
-
2009
- 2009-02-02 FR FR0950645A patent/FR2941837B1/fr not_active Expired - Fee Related
-
2010
- 2010-01-27 CN CN201080006280.7A patent/CN102301745A/zh active Pending
- 2010-01-27 WO PCT/FR2010/050121 patent/WO2010086549A1/fr active Application Filing
- 2010-01-27 US US13/147,535 patent/US8934659B2/en not_active Expired - Fee Related
- 2010-01-27 CA CA2751117A patent/CA2751117A1/fr not_active Abandoned
- 2010-01-27 AU AU2010209543A patent/AU2010209543A1/en not_active Abandoned
- 2010-01-27 EP EP10707594A patent/EP2392151B1/fr not_active Not-in-force
- 2010-01-27 JP JP2011546919A patent/JP5586629B2/ja not_active Expired - Fee Related
Non-Patent Citations (1)
Title |
---|
See references of WO2010086549A1 * |
Also Published As
Publication number | Publication date |
---|---|
JP5586629B2 (ja) | 2014-09-10 |
FR2941837A1 (fr) | 2010-08-06 |
JP2012517134A (ja) | 2012-07-26 |
WO2010086549A1 (fr) | 2010-08-05 |
AU2010209543A1 (en) | 2011-09-15 |
US20110286623A1 (en) | 2011-11-24 |
CN102301745A (zh) | 2011-12-28 |
CA2751117A1 (fr) | 2010-08-05 |
EP2392151B1 (fr) | 2012-12-05 |
FR2941837B1 (fr) | 2016-09-16 |
US8934659B2 (en) | 2015-01-13 |
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