EP2700247B1 - Device for emitting an acoustic wave - Google Patents

Device for emitting an acoustic wave Download PDF

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Publication number
EP2700247B1
EP2700247B1 EP12724668.4A EP12724668A EP2700247B1 EP 2700247 B1 EP2700247 B1 EP 2700247B1 EP 12724668 A EP12724668 A EP 12724668A EP 2700247 B1 EP2700247 B1 EP 2700247B1
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EP
European Patent Office
Prior art keywords
coupler
emission device
section
level
mpa
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EP12724668.4A
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German (de)
French (fr)
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EP2700247A1 (en
Inventor
François DEFFARGES
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Nexo SA
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Nexo SA
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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
    • H04R7/00—Diaphragms for electromechanical transducers; Cones
    • H04R7/02—Diaphragms for electromechanical transducers; Cones characterised by the construction
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
    • H04R1/32—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only
    • H04R1/40—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by combining a number of identical transducers
    • H04R1/403—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by combining a number of identical transducers loud-speakers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2201/00—Details of transducers, loudspeakers or microphones covered by H04R1/00 but not provided for in any of its subgroups
    • H04R2201/40—Details of arrangements for obtaining desired directional characteristic by combining a number of identical transducers covered by H04R1/40 but not provided for in any of its subgroups
    • H04R2201/401—2D or 3D arrays of transducers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R7/00—Diaphragms for electromechanical transducers; Cones
    • H04R7/02—Diaphragms for electromechanical transducers; Cones characterised by the construction
    • H04R7/04—Plane diaphragms
    • H04R7/06—Plane diaphragms comprising a plurality of sections or layers
    • H04R7/10—Plane diaphragms comprising a plurality of sections or layers comprising superposed layers in contact
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R7/00—Diaphragms for electromechanical transducers; Cones
    • H04R7/02—Diaphragms for electromechanical transducers; Cones characterised by the construction
    • H04R7/12—Non-planar diaphragms or cones
    • H04R7/122—Non-planar diaphragms or cones comprising a plurality of sections or layers
    • H04R7/125—Non-planar diaphragms or cones comprising a plurality of sections or layers comprising a plurality of superposed layers in contact
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R7/00—Diaphragms for electromechanical transducers; Cones
    • H04R7/16—Mounting or tensioning of diaphragms or cones
    • 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
    • H04R9/046—Construction

Definitions

  • the invention relates to a device for transmitting an acoustic wave, such as a loudspeaker.
  • Acoustic wave emission devices are commonly used comprising a flared structural part (or salad bowl) which carries at its base an electromechanical transducer (including for example a coil) and which defines at its flared end an outlet surface.
  • a flared structural part or salad bowl
  • an electromechanical transducer including for example a coil
  • a diaphragm connected to the transducer is then generally suspended mounted within the structural part (i.e., on the same side of the exit surface as the transducer).
  • the membrane is vibrated by the transducer and thus emits an acoustic wave (in this case through the exit surface).
  • EP 1 178 701 A2 (FANE ACOUSTICS LTD [GB]), February 6, 2002, discloses a low frequency reproduction speaker comprising an electromagnetic salad bowl transducer, the transducer having a conical diaphragm having an upper suspension connected to the end of the flared part of the salad bowl.
  • the conical diaphragm is completed beyond the bowl by a flat diaphragm whose ends are mechanically coupled to the housing of the loudspeaker.
  • Such a device makes it possible to use a conventional flared structural part, of salad bowl type, and to juxtapose several emission devices to form a continuous emission surface (thanks to the surface section greater than the exit surface).
  • the coupler may also have an emitting surface at the third section.
  • This emitting surface is for example flat or cylindrical.
  • the juxtaposition of planar or cylindrical emissive surface devices makes it possible to easily obtain a continuous emission surface (formed by the joining of the emitting surfaces of the devices), plane or cylindrical, respectively.
  • Other forms of emissive surface are also conceivable, such as for example a spherical emissive surface.
  • End portions of the third section opposite the second section are free, for example, and can thus be vibrated by the transducer.
  • the coupler has for example a homogeneous density in its volume.
  • the third section has a density different from the density of the second section.
  • the second section has for example a symmetry of revolution.
  • the second section could be symmetrical with respect to each of two planes substantially parallel to the emission axis of the device (the axis in which the first, second and third sections succeed each other).
  • the second section may not have symmetry.
  • the coupler has for example a density of less than 110 kg.m -3 (and / or greater than 32 kg.m -3 ), typically between 32 kg.m -3 and 110 kg.m -3 .
  • the drive of the coupler (by the transducer) is thus possible in good conditions despite its volume greater than that of a membrane.
  • the coupler is for example made of at least one material having a Young's modulus greater than 36 MPa and / or less than 160 MPa, ie typically between 36 MPa and 160 MPa.
  • the coupler is for example made of at least one material having a shear modulus greater than 13 MPa and / or less than 50 MPa, ie typically between 13 MPa and 50 MPa.
  • the coupler is for example made of at least one material having a Poisson's ratio greater than 0.2 and / or less than 0.3, which is typically between 0.2 and 0.3.
  • the coupler is for example made of at least one waterproof material.
  • the coupler When the coupler is suspended on the structural part at the second section by means of a first suspension, the coupler can also be suspended on the structural part by means of a second suspension distinct from the first suspension. This second suspension can be done through another element such as the coil holder.
  • the speaker shown on the Figures 1 and 2 comprises a flared structural part or salad bowl 2, of generally cylindrical shape of revolution about an axis X of the loudspeaker (which corresponds as explained below to the main direction of emission of acoustic waves by the loudspeaker) .
  • the salad bowl thus has a base 22, which corresponds to the end of the salad bowl 2 along the X axis at which the salad bowl 2 has the smallest space in section perpendicular to the X axis.
  • the salad bowl 2 has, at its flared end 24 opposite the base 22 along the axis X, an outlet surface S (for example planar) whose surface (always in section perpendicular to the axis X) is therefore greater than the sectional area of the base 22.
  • an outlet surface S for example planar
  • an electromechanical transducer 3 which comprises a first piece of soft iron 32, a second piece of soft iron 34 and a magnet 33. These three elements are fixed relative to each other and relative to the salad bowl 2.
  • the electromechanical transducer also comprises a coil body 36 on which a coil 38 is mounted.
  • the first piece of soft iron 32 comprises a first cylindrical portion of size (in section perpendicular to the X axis) identical to the bulk of the magnet 33 and the second piece of soft iron 34.
  • the magnet 33 and the second piece of soft iron 34 are made in annular form around the axis X.
  • the first piece of soft iron 32 also comprises a second portion having a cross-sectional area (perpendicular to the X axis) smaller than that of the first part; the second part is received inside the annular magnet 33 and the second annular piece 34.
  • the internal diameter of the annular pieces 33, 34 is greater than the external diameter of the second part of the first piece 32, this makes it possible to provide an annular space where the coil 38 carried by the coil support 36 is received.
  • the coil body 36 here has the shape of a straight cylinder and carries, at the end (along the X axis) of the cylinder opposite the end bearing the coil 36, a mechano-acoustic coupler 4 here formed of a full piece in ROHACELL.
  • the three sections are made of the same homogeneous material as indicated above and the coupler therefore has a homogeneous density in its volume.
  • each section is made of a specific material.
  • the coupler 4 is suspended on the salad bowl 2 at its second section 42 by means of a first suspension 51.
  • This first suspension 51 is produced here in the form of an annular elastic piece (around the X axis) mounted in the example of the figure 1 between the flared end 24 of the salad bowl 2 and the second section 42 of the coupler 4.
  • the coupler 4 is however not connected (either by a suspension or a rigid attachment) to the structure of the speaker at its third section 43.
  • the end regions of the emitting surface 45 (which extend here over the entire circumference of the emitting surface 45), that is to say the end portions of the third section 43 located opposite the second section 42, are free. These end regions are therefore vibrated by the transducer.
  • the assembly formed by the coil body 36 and the coupler 4 is also suspended from the bowl 2 at the coil body 36 by means of two annular suspensions (or " spiders "). "in the English terminology) 52, 53.
  • the second section 42 has a symmetry of revolution about the X axis.
  • Other forms are however possible.
  • the third section 43 extends from the second section 42 (that is to say from the exit surface S) to the emitting surface 45.
  • the emitting surface 45 has a sectional area at least equal to the maximum space in section of the salad bowl, and therefore greater than the outlet surface S.
  • the sectional area of the third section 43 goes from a value lower than the exit surface S (at this exit surface where the coupler 4 is still received inside the salad bowl 2) to a value greater than the exit surface S (especially at the level of the emitting surface 45 as just indicated). This is possible because the third section 43 extends outside (towards the front) of the salad bowl, that is to say opposite the transducer 3 with respect to the exit surface.
  • the loudspeakers may be arranged so that their respective emitting surfaces are contiguous and thus together define a continuous acoustic emission surface, here planar, as represented for example in figure 5 .
  • the speaker of the Figures 3 and 4 includes elements similar to those of the loudspeaker of Figures 1 and 2 and it is not necessary to describe these elements again in detail.
  • the speaker of the Figures 3 and 4 differs from that of Figures 1 and 2 by the shape of its emitting surface 145: the third section 143 of the coupler 4 has an emitting surface 145 having the shape of a straight cylinder portion of Y axis perpendicular to the X axis of the loudspeaker.
  • the emitting surface 145 has also in section perpendicular to the axis X a rectangular general shape and its end regions are free.
  • the emitting surface presented by the third section of the coupler is spherical and thus makes it possible to obtain, by the juxtaposition of several emitting surfaces of different loudspeakers, a continuous and spherical emission surface.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Multimedia (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)

Description

L'invention concerne un dispositif d'émission d'une onde acoustique, tel qu'un haut-parleur.The invention relates to a device for transmitting an acoustic wave, such as a loudspeaker.

On utilise couramment des dispositifs d'émission d'une onde acoustique comprenant une pièce structurelle évasée (ou saladier) qui porte à sa base un transducteur électromécanique (incluant par exemple une bobine) et qui définit à son extrémité évasée une surface de sortie.Acoustic wave emission devices are commonly used comprising a flared structural part (or salad bowl) which carries at its base an electromechanical transducer (including for example a coil) and which defines at its flared end an outlet surface.

Une membrane reliée au transducteur est alors généralement montée suspendue à l'intérieur de la pièce structurelle (c'est-à-dire du même côté de la surface de sortie que le transducteur). La membrane est entraînée en vibration par le transducteur et émet ainsi une onde acoustique (en l'occurrence à travers la surface de sortie).A diaphragm connected to the transducer is then generally suspended mounted within the structural part (i.e., on the same side of the exit surface as the transducer). The membrane is vibrated by the transducer and thus emits an acoustic wave (in this case through the exit surface).

Lorsque l'on juxtapose des dispositifs réalisés selon cette conception, il n'est pas possible d'obtenir une surface émissive continue du fait que l'encombrement des pièces structurelles (ou saladiers) est supérieur à celui de chaque membrane ; les membranes des différents dispositifs ne sont donc pas quant à elles contiguës.When juxtaposed devices made according to this design, it is not possible to obtain a continuous emissive surface because the bulk of the structural parts (or salad bowls) is greater than that of each membrane; the membranes of the different devices are therefore not contiguous.

Pour améliorer cet état de fait, la demande de brevet US 2009/141 916 a proposé une conception selon laquelle un diaphragme rayonnant est monté à l'extrémité d'un corps de bobine cylindrique. Cette conception n'inclut donc pas la pièce structurelle évasée (ou saladier) classiquement utilisée, comme le souligne d'ailleurs la demande de brevet.To improve this state of affairs, the patent application US 2009/141,916 proposed a design in which a radiating diaphragm is mounted at the end of a cylindrical coil body. This design does not include the flared structural part (or salad bowl) conventionally used, as underlined by the patent application.

EP 1 178 701 A2 (FANE ACOUSTICS LTD [GB]), 6 février 2002, divulgue un haut-parleur destiné à la reproduction des basses fréquences comprenant un transducteur électromagnétique à saladier, le transducteur ayant un diaphragme conique muni d'une suspension supérieure connectée à l'extrémité de la partie évasée du saladier. Le diaphragme conique est complété au-delà du saladier par un diaphragme plat dont les extrémités sont couplées mécaniquement au boîtier du haut-parleur. EP 1 178 701 A2 (FANE ACOUSTICS LTD [GB]), February 6, 2002, discloses a low frequency reproduction speaker comprising an electromagnetic salad bowl transducer, the transducer having a conical diaphragm having an upper suspension connected to the end of the flared part of the salad bowl. The conical diaphragm is completed beyond the bowl by a flat diaphragm whose ends are mechanically coupled to the housing of the loudspeaker.

Il peut être souhaitable pour différentes raisons, notamment pour éviter un développement spécifique et recourir au contraire à une pièce de conception éprouvée, de continuer à utiliser une pièce structurelle évasée. On cherche ainsi notamment à proposer une conception qui permette la juxtaposition des surfaces émissives de différents dispositifs d'émission sans remettre en cause l'utilisation d'une pièce structurelle évasée.It may be desirable for various reasons, in particular to avoid specific development and resort to the contrary to a proven design part, to continue to use a flared structural part. In particular, it seeks to provide a design that allows the juxtaposition of the emitting surfaces of different emission devices without questioning the use of a flared structural part.

Dans ce but notamment, l'invention propose un dispositif d'émission d'une onde acoustique comprenant une pièce structurelle évasée portant à sa base un transducteur électromécanique et définissant à son extrémité évasée une surface de sortie, caractérisé par un coupleur mécano-acoustique réalisé d'une pièce et présentant :

  • un premier tronçon de montage sur le transducteur,
  • un second tronçon s'étendant à partir du premier tronçon jusqu'au niveau de la surface de sortie, le coupleur étant suspendu sur la pièce structurelle au niveau du second tronçon et le second tronçon ayant une surface en section au niveau de la surface de sortie strictement supérieure à sa surface en section au niveau du premier tronçon, et
  • un troisième tronçon s'étendant à partir du second tronçon, où le troisième tronçon à une surface en section inférieure à la surface de sortie, le troisième tronçon comprenant une section de surface supérieure à la surface de sortie. Le coupleur est par ailleurs une pièce pleine.
For this purpose in particular, the invention proposes a device for transmitting an acoustic wave comprising a flared structural part carrying at its base an electromechanical transducer and defining at its flared end an exit surface, characterized by a mechano-acoustic coupler made in one piece and presenting:
  • a first mounting section on the transducer,
  • a second section extending from the first section to the level of the exit surface, the coupler being suspended on the structural part at the second section and the second section having a sectional area at the exit surface strictly greater than its sectional area at the level of the first section, and
  • a third section extending from the second section, where the third section has a lower section surface than the output surface, the third section comprising a surface section greater than the output surface. The coupler is also a solid piece.

Un tel dispositif permet d'utiliser une pièce structurelle évasée classique, de type saladier, et de juxtaposer plusieurs dispositifs d'émission pour former une surface d'émission continue (grâce à la section de surface supérieure à la surface de sortie).Such a device makes it possible to use a conventional flared structural part, of salad bowl type, and to juxtapose several emission devices to form a continuous emission surface (thanks to the surface section greater than the exit surface).

On définit par ailleurs ainsi un coupleur mécano-acoustique particulièrement efficace.Furthermore, a particularly effective mechano-acoustic coupler is defined.

Le coupleur peut d'ailleurs présenter une surface émissive au niveau du troisième tronçon. Cette surface émissive est par exemple plane ou cylindrique. La juxtaposition de dispositifs à surface émissive plane, respectivement cylindrique, permet d'obtenir aisément une surface d'émission continue (formée de la réunion des surfaces émissives des dispositifs) plane, respectivement cylindrique. D'autres formes de surface émissive sont également envisageables, telle que par exemple une surface émissive sphérique.The coupler may also have an emitting surface at the third section. This emitting surface is for example flat or cylindrical. The juxtaposition of planar or cylindrical emissive surface devices makes it possible to easily obtain a continuous emission surface (formed by the joining of the emitting surfaces of the devices), plane or cylindrical, respectively. Other forms of emissive surface are also conceivable, such as for example a spherical emissive surface.

Des parties d'extrémité du troisième tronçon opposées au second tronçon (ou régions d'extrémité de la surface émissive) sont par exemple libres et peuvent ainsi être entraînées en vibration par le transducteur.End portions of the third section opposite the second section (or end regions of the emitting surface) are free, for example, and can thus be vibrated by the transducer.

Le coupleur présente par exemple une densité homogène dans son volume. On peut toutefois prévoir en variante que le troisième tronçon présente une densité différente de la densité du second tronçon.The coupler has for example a homogeneous density in its volume. However, it can be alternatively provided that the third section has a density different from the density of the second section.

Le second tronçon présente par exemple une symétrie de révolution. En variante, le second tronçon pourrait être symétrique par rapport à chacun de deux plans essentiellement parallèles à l'axe d'émission du dispositif (axe selon lequel se succèdent les premier, second et troisième tronçons). Selon une autre variante, le second tronçon pourrait ne pas présenter de symétrie.The second section has for example a symmetry of revolution. As a variant, the second section could be symmetrical with respect to each of two planes substantially parallel to the emission axis of the device (the axis in which the first, second and third sections succeed each other). According to another variant, the second section may not have symmetry.

Le coupleur a par exemple une densité inférieure à 110 kg.m-3 (et/ou supérieure à 32 kg.m-3), soit typiquement comprise entre 32 kg.m-3 et 110 kg.m-3. L'entraînement du coupleur (par le transducteur) est ainsi possible dans de bonnes conditions malgré son volume supérieur à celui d'une membrane.The coupler has for example a density of less than 110 kg.m -3 (and / or greater than 32 kg.m -3 ), typically between 32 kg.m -3 and 110 kg.m -3 . The drive of the coupler (by the transducer) is thus possible in good conditions despite its volume greater than that of a membrane.

Le coupleur est par exemple réalisé dans au moins un matériau présentant un module d'Young supérieur à 36 MPa et/ou inférieur à 160 MPa, soit typiquement compris entre 36 MPa et 160 MPa.The coupler is for example made of at least one material having a Young's modulus greater than 36 MPa and / or less than 160 MPa, ie typically between 36 MPa and 160 MPa.

Le coupleur est par exemple réalisé dans au moins un matériau présentant un module de cisaillement supérieur à 13 MPa et/ou inférieur à 50 MPa, soit typiquement compris entre 13 MPa et 50 MPa.The coupler is for example made of at least one material having a shear modulus greater than 13 MPa and / or less than 50 MPa, ie typically between 13 MPa and 50 MPa.

Le coupleur est par exemple réalisé dans au moins un matériau présentant un coefficient de Poisson supérieur à 0,2 et/ou inférieur à 0,3, soit typiquement compris entre 0,2 et 0,3.The coupler is for example made of at least one material having a Poisson's ratio greater than 0.2 and / or less than 0.3, which is typically between 0.2 and 0.3.

Le coupleur est par exemple réalisé dans au moins un matériau étanche à l'eau.The coupler is for example made of at least one waterproof material.

Ces caractéristiques du matériau du coupleur permettent d'obtenir des performances intéressantes sur le plan acoustique.These characteristics of the coupler material make it possible to obtain acoustically interesting performances.

Lorsque le coupleur est suspendu sur la pièce structurelle au niveau du second tronçon au moyen d'une première suspension, le coupleur peut également être suspendu sur la pièce structurelle au moyen d'une seconde suspension distincte de la première suspension. Cette seconde suspension peut se faire par l'intermédiaire d'un autre élément tel que le support de bobine.When the coupler is suspended on the structural part at the second section by means of a first suspension, the coupler can also be suspended on the structural part by means of a second suspension distinct from the first suspension. This second suspension can be done through another element such as the coil holder.

D'autres caractéristiques et avantages de l'invention apparaîtront mieux à la lecture de la description qui suit, faite en référence aux dessins annexés dans lesquels :

  • la figure 1 représente une vue en coupe d'un haut-parleur selon un premier mode de réalisation de l'invention ;
  • la figure 2 représente une vue en perspective du haut-parleur de la figure 1 ;
  • la figure 3 représente une vue en coupe d'un haut-parleur selon un second mode de réalisation ;
  • la figure 4 présente une vue en perspective du haut-parleur de la figure 3
  • la figure 5 représente une première possibilité de juxtaposition d'une pluralité de haut-parleurs conformes chacun aux figures 3 et 4 ;
  • la figure 6 représente une possibilité de juxtaposition d'une pluralité de haut-parleurs conformes chacun aux figures 1 et 2 ;
  • la figure 7 représente une seconde possibilité de juxtaposition d'une pluralité de haut-parleurs conformes chacun aux figures 3 et 4.
Other characteristics and advantages of the invention will appear better on reading the description which follows, made with reference to the appended drawings in which:
  • the figure 1 represents a sectional view of a loudspeaker according to a first embodiment of the invention;
  • the figure 2 represents a perspective view of the loudspeaker of the figure 1 ;
  • the figure 3 represents a sectional view of a loudspeaker according to a second embodiment;
  • the figure 4 presents a perspective view of the loudspeaker of the figure 3
  • the figure 5 represents a first possibility of juxtaposition of a plurality of loudspeakers each conforming to Figures 3 and 4 ;
  • the figure 6 represents a possibility of juxtaposition of a plurality of loudspeakers each conforming to Figures 1 and 2 ;
  • the figure 7 represents a second possibility of juxtaposition of a plurality of loudspeakers each conforming to Figures 3 and 4 .

Le haut-parleur représenté sur les figures 1 et 2 comprend une pièce structurelle évasée ou saladier 2, de forme générale cylindrique de révolution autour d'un axe X du haut-parleur (qui correspond comme expliqué dans la suite à la direction principale d'émission d'ondes acoustiques par le haut-parleur).The speaker shown on the Figures 1 and 2 comprises a flared structural part or salad bowl 2, of generally cylindrical shape of revolution about an axis X of the loudspeaker (which corresponds as explained below to the main direction of emission of acoustic waves by the loudspeaker) .

Le saladier présente ainsi une base 22, qui correspond à l'extrémité du saladier 2 selon l'axe X au niveau de laquelle le saladier 2 présente le plus faible encombrement en section perpendiculaire à l'axe X.The salad bowl thus has a base 22, which corresponds to the end of the salad bowl 2 along the X axis at which the salad bowl 2 has the smallest space in section perpendicular to the X axis.

Le saladier 2 présente, à son extrémité évasée 24 opposée à la base 22 selon l'axe X, une surface de sortie S (par exemple plane) dont la surface (toujours en section perpendiculairement à l'axe X) est donc supérieure à la surface en section de la base 22.The salad bowl 2 has, at its flared end 24 opposite the base 22 along the axis X, an outlet surface S (for example planar) whose surface (always in section perpendicular to the axis X) is therefore greater than the sectional area of the base 22.

Au niveau de la base 22 du saladier 2 est monté un transducteur électromécanique 3 qui comprend une première pièce en fer doux 32, une seconde pièce en fer doux 34 et un aimant 33. Ces trois éléments sont fixes l'un par rapport à l'autre et par rapport au saladier 2.At the base 22 of the salad bowl 2 is mounted an electromechanical transducer 3 which comprises a first piece of soft iron 32, a second piece of soft iron 34 and a magnet 33. These three elements are fixed relative to each other and relative to the salad bowl 2.

Le transducteur électromécanique comprend également un corps de bobine 36 sur lequel est montée une bobine 38.The electromechanical transducer also comprises a coil body 36 on which a coil 38 is mounted.

La première pièce en fer doux 32 comprend une première partie cylindrique d'encombrement (en section perpendiculaire à l'axe X) identique à l'encombrement de l'aimant 33 et de la seconde pièce en fer doux 34. On note à cet égard que l'aimant 33 et la seconde pièce en fer doux 34 sont réalisés sous forme annulaire autour de l'axe X.The first piece of soft iron 32 comprises a first cylindrical portion of size (in section perpendicular to the X axis) identical to the bulk of the magnet 33 and the second piece of soft iron 34. In this regard that the magnet 33 and the second piece of soft iron 34 are made in annular form around the axis X.

La première pièce en fer doux 32 comprend également une seconde partie présentant un encombrement en section (perpendiculairement à l'axe X) inférieur à celui de la première partie ; la seconde partie est reçue à l'intérieur de l'aimant annulaire 33 et de la seconde pièce annulaire 34. Autrement dit, le diamètre interne des pièces annulaires 33, 34 est supérieur au diamètre externe de la seconde partie de la première pièce 32, ce qui permet de ménager un espace annulaire où est reçue la bobine 38 portée par le support de bobine 36.The first piece of soft iron 32 also comprises a second portion having a cross-sectional area (perpendicular to the X axis) smaller than that of the first part; the second part is received inside the annular magnet 33 and the second annular piece 34. In other words, the internal diameter of the annular pieces 33, 34 is greater than the external diameter of the second part of the first piece 32, this makes it possible to provide an annular space where the coil 38 carried by the coil support 36 is received.

Ainsi, le passage d'un courant d'intensité variable dans la bobine 38 permet d'entraîner celle-ci, et par conséquent le support de bobine 36, en mouvement par rapport aux pièces 32, 34 et donc par rapport au saladier 2.Thus, the passage of a current of variable intensity in the coil 38 serves to drive it, and consequently the coil support 36, moving relative to the parts 32, 34 and therefore with respect to the bowl 2.

Le corps de bobine 36 présente ici la forme d'un cylindre droit et porte, à l'extrémité (selon l'axe X) du cylindre opposée à l'extrémité portant la bobine 36, un coupleur mécano-acoustique 4 ici formé d'une pièce pleine en ROHACELL.The coil body 36 here has the shape of a straight cylinder and carries, at the end (along the X axis) of the cylinder opposite the end bearing the coil 36, a mechano-acoustic coupler 4 here formed of a full piece in ROHACELL.

Le coupleur 4 présente trois tronçons qui s'étendent successivement le long de l'axe X :

  • un premier tronçon 41, ici réalisé sous la forme d'un cylindre droit de diamètre extérieur identique au diamètre intérieur du support de bobine 36 afin de permettre un montage du coupleur 4 sur le support de bobine 36 ;
  • un second tronçon 42 qui s'étend à partir du premier tronçon 41 et jusqu'au niveau de la surface de sortie S du saladier 2 ;
  • un troisième tronçon 43 qui s'étend à partir du second tronçon 42 (au niveau de la surface de sortie S) jusqu'à une surface émissive 45, plane et généralement rectangulaire dans le présent mode de réalisation.
The coupler 4 has three sections which extend successively along the axis X:
  • a first section 41, here produced in the form of a right cylinder of outside diameter identical to the inside diameter of the coil support 36 to allow mounting of the coupler 4 on the coil support 36;
  • a second section 42 which extends from the first section 41 and up to the level of the outlet surface S of the salad bowl 2;
  • a third section 43 which extends from the second section 42 (at the exit surface S) to a flat, generally rectangular emissive surface 45 in the present embodiment.

Dans l'exemple décrit ici, les trois tronçons sont réalisés dans un même matériau homogène comme indiqué ci-dessus et le coupleur présente donc une densité homogène dans son volume.In the example described here, the three sections are made of the same homogeneous material as indicated above and the coupler therefore has a homogeneous density in its volume.

On peut prévoir en variante que chaque tronçon soit réalisé dans un matériau spécifique.It can be alternatively provided that each section is made of a specific material.

Le coupleur 4 est suspendu sur le saladier 2 au niveau de son second tronçon 42 au moyen d'une première suspension 51. Cette première suspension 51 est réalisée ici sous la forme d'une pièce élastique annulaire (autour de l'axe X) montée dans l'exemple de la figure 1 entre l'extrémité évasée 24 du saladier 2 et le second tronçon 42 du coupleur 4.The coupler 4 is suspended on the salad bowl 2 at its second section 42 by means of a first suspension 51. This first suspension 51 is produced here in the form of an annular elastic piece (around the X axis) mounted in the example of the figure 1 between the flared end 24 of the salad bowl 2 and the second section 42 of the coupler 4.

Le coupleur 4 n'est en revanche pas lié (que ce soit par une suspension ou par une fixation rigide) à la structure du haut-parleur au niveau de son troisième tronçon 43. En particulier, les régions d'extrémité de la surface émissive 45 (qui s'étendent ici sur toute la circonférence de la surface émissive 45), c'est-à-dire les parties d'extrémité du troisième tronçon 43 situées à l'opposé du second tronçon 42, sont libres. Ces régions d'extrémité sont donc entraînées en vibration par le transducteur.The coupler 4 is however not connected (either by a suspension or a rigid attachment) to the structure of the speaker at its third section 43. In particular, the end regions of the emitting surface 45 (which extend here over the entire circumference of the emitting surface 45), that is to say the end portions of the third section 43 located opposite the second section 42, are free. These end regions are therefore vibrated by the transducer.

On remarque par ailleurs que, dans le présent mode de réalisation, l'ensemble formé par le corps de bobine 36 et le coupleur 4 est également suspendu au saladier 2 au niveau du corps de bobine 36 au moyen de deux suspensions annulaires (ou "spiders" selon la terminologie anglo-saxonne) 52, 53.Note also that, in the present embodiment, the assembly formed by the coil body 36 and the coupler 4 is also suspended from the bowl 2 at the coil body 36 by means of two annular suspensions (or " spiders "). "in the English terminology) 52, 53.

Dans le mode de réalisation décrit, le second tronçon 42 présente une symétrie de révolution autour de l'axe X. D'autres formes sont toutefois envisageables.In the embodiment described, the second section 42 has a symmetry of revolution about the X axis. Other forms are however possible.

Comme déjà indiqué, le troisième tronçon 43 s'étend du second tronçon 42 (c'est-à-dire à partir de la surface de sortie S) jusqu'à la surface émissive 45. Comme bien visible sur les figures, la surface émissive 45 présente une surface en section au moins égale à l'encombrement maximum en section du saladier, et donc supérieure à la surface de sortie S.As already indicated, the third section 43 extends from the second section 42 (that is to say from the exit surface S) to the emitting surface 45. As can be seen in the figures, the emitting surface 45 has a sectional area at least equal to the maximum space in section of the salad bowl, and therefore greater than the outlet surface S.

Ainsi, la surface en section du troisième tronçon 43 passe d'une valeur inférieure à la surface de sortie S (au niveau de cette surface de sortie où le coupleur 4 est encore reçu à l'intérieur du saladier 2) à une valeur supérieure à la surface de sortie S (notamment au niveau de la surface émissive 45 comme il vient d'être indiqué). Ceci est possible du fait que le troisième tronçon 43 s'étend à l'extérieur (vers l'avant) du saladier, c'est-à-dire à l'opposé du transducteur 3 par rapport à la surface de sortie.Thus, the sectional area of the third section 43 goes from a value lower than the exit surface S (at this exit surface where the coupler 4 is still received inside the salad bowl 2) to a value greater than the exit surface S (especially at the level of the emitting surface 45 as just indicated). This is possible because the third section 43 extends outside (towards the front) of the salad bowl, that is to say opposite the transducer 3 with respect to the exit surface.

Ainsi, lorsque l'on utilise plusieurs haut-parleurs du type de ceux des figures 1 et 2, les haut-parleurs peuvent être disposés de telle sorte que leurs surfaces émissives respectives soient contiguës et définissent donc ensemble une surface d'émission acoustique continue, ici plane, comme représenté par exemple en figure 5.Thus, when using several speakers of the type of those of Figures 1 and 2 the loudspeakers may be arranged so that their respective emitting surfaces are contiguous and thus together define a continuous acoustic emission surface, here planar, as represented for example in figure 5 .

Les figures 3 et 4 représentent un second mode de réalisation de l'invention.The Figures 3 and 4 represent a second embodiment of the invention.

Le haut-parleur des figures 3 et 4 comprend des éléments similaires à ceux du haut-parleur des figures 1 et 2 et il n'est donc pas nécessaire de décrire à nouveau de manière détaillée ces éléments.The speaker of the Figures 3 and 4 includes elements similar to those of the loudspeaker of Figures 1 and 2 and it is not necessary to describe these elements again in detail.

On pourra se référer à la description qui vient d'être donnée pour les figures 1 et 2, en augmentant les références de 100.We can refer to the description that has just been given for the Figures 1 and 2 , increasing the references by 100.

Le haut-parleur des figures 3 et 4 se distingue de celui des figures 1 et 2 par la forme de sa surface émissive 145 : le troisième tronçon 143 du coupleur 4 présente une surface émissive 145 ayant la forme d'une portion de cylindre droit d'axe Y perpendiculaire à l'axe X du haut-parleur.The speaker of the Figures 3 and 4 differs from that of Figures 1 and 2 by the shape of its emitting surface 145: the third section 143 of the coupler 4 has an emitting surface 145 having the shape of a straight cylinder portion of Y axis perpendicular to the X axis of the loudspeaker.

Comme pour le haut-parleur des figures 1 et 2, la surface émissive 145 présente par ailleurs en section perpendiculaire à l'axe X une forme générale rectangulaire et ses régions d'extrémité sont libres.As for the speaker of Figures 1 and 2 , the emitting surface 145 has also in section perpendicular to the axis X a rectangular general shape and its end regions are free.

Ainsi, il est possible en utilisant plusieurs haut-parleurs du type de ceux présentés aux figures 3 et 4 de les disposer de manière à ce que leurs surfaces émissives soient contiguës et définissent ainsi ensemble une surface d'émission acoustique continue et de forme cylindrique. Deux exemples distincts de telles juxtapositions de haut-parleurs sont présentés respectivement à la figures 5 (où les haut-parleurs sont disposés en arc de cercle autour de l'axe Y du cylindre) et à la figure 7 (où les haut-parleurs sont alignés parallèlement à l'axe Y du cylindre). Ces deux types de juxtaposition peuvent d'ailleurs être combinés pour former un mur cylindrique de haut-parleurs.Thus, it is possible by using several speakers of the type of those presented to Figures 3 and 4 arranging them so that their emitting surfaces are contiguous and thus together define a continuous acoustic emission surface and of cylindrical shape. Two examples distinct from such juxtapositions of loudspeakers are presented respectively in figures 5 (where the loudspeakers are arranged in an arc around the Y axis of the cylinder) and at the figure 7 (where the speakers are aligned parallel to the Y axis of the cylinder). These two types of juxtaposition can also be combined to form a cylindrical wall of speakers.

On pourrait envisager de même que la surface émissive présentée par le troisième tronçon du coupleur soit sphérique et permette ainsi d'obtenir, par la juxtaposition de plusieurs surfaces émissives de haut-parleurs différents, une surface d'émission continue et sphérique.It could be envisaged as well that the emitting surface presented by the third section of the coupler is spherical and thus makes it possible to obtain, by the juxtaposition of several emitting surfaces of different loudspeakers, a continuous and spherical emission surface.

Les modes de réalisation qui précèdent ne sont que des exemples possibles pour la mise en oeuvre de l'invention.The preceding embodiments are only possible examples for the implementation of the invention.

Claims (14)

  1. A device for emitting an acoustic wave comprising a flared structural piece (2; 102) bearing at its base an electromechanical transducer (3) and defining at its flared end an output surface (S),
    a single-piece mechanical-acoustic coupler (4; 104) exhibiting:
    - a first portion (41; 141) for mounting on the transducer,
    - a second portion (42; 142) extending from the first portion up to the level of the output surface, the coupler being suspended on the structural piece at the level of the second portion and the second portion having a cross-sectional area at the level of the output surface which is strictly greater than its cross-sectional area at the level of the first portion, and
    - a third portion (43; 143) extending from the second portion, where the third portion has a cross-sectional area which is smaller than the output surface, the third portion comprising a cross section of greater area than the output surface, characterized in that the mechanical-acoustic coupler (4; 104) is a solid piece.
  2. The emission device according to claim 1, in which the coupler exhibits an emitting surface (45; 145) at the level of the third portion.
  3. The emission device according to claim 2, in which the emitting surface (45) is flat.
  4. The emission device according to claim 2, in which the emitting surface (145) is cylindrical.
  5. The emission device according to one of claims 1 to 4, in which end parts of the third portion (43; 143) opposite the second portion (42; 142) are free.
  6. The emission device according to one of claims 1 to 5, in which the coupler exhibits a homogeneous density in its volume.
  7. The emission device according to one of claims 1 to 5, in which the third portion exhibits a density different from the density of the second portion.
  8. The emission device according to one of claims 1 to 7, in which the second portion exhibits rotational symmetry.
  9. The emission device according to one of claims 1 to 8, in which the coupler has a density comprised between 32 kg/m3 and 110 kg/m3.
  10. The emission device according to one of claims 1 to 9, in which the coupler is produced from at least one material exhibiting a Young's modulus of elasticity comprised between 36 MPa and 160 MPa.
  11. The emission device according to one of claims 1 to 10, in which the coupler is produced from at least one material exhibiting a shear modulus comprised between 13 MPa and 50 MPa.
  12. The emission device according to one of claims 1 to 11, in which the coupler is produced from at least one material exhibiting a Poisson's ratio comprised between 0,2 and 0,3.
  13. The emission device according to one of claims 1 to 12, in which the coupler is produced from at least one watertight material.
  14. The emission device according to one of claims 1 to 13, in which the coupler is suspended on the structural piece at the level of the second portion by means of a first suspension (51; 151) and in which the coupler is suspended on the structural piece by means of a second suspension (52, 53; 152, 153) which is distinct from the first suspension.
EP12724668.4A 2011-04-20 2012-04-13 Device for emitting an acoustic wave Active EP2700247B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1153405A FR2974476A1 (en) 2011-04-20 2011-04-20 DEVICE FOR EMITTING AN ACOUSTIC WAVE
PCT/FR2012/050824 WO2012143657A1 (en) 2011-04-20 2012-04-13 Device for emitting an acoustic wave

Publications (2)

Publication Number Publication Date
EP2700247A1 EP2700247A1 (en) 2014-02-26
EP2700247B1 true EP2700247B1 (en) 2018-10-31

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EP12724668.4A Active EP2700247B1 (en) 2011-04-20 2012-04-13 Device for emitting an acoustic wave

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US (1) US9544693B2 (en)
EP (1) EP2700247B1 (en)
JP (1) JP6014118B2 (en)
FR (1) FR2974476A1 (en)
WO (1) WO2012143657A1 (en)

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Publication number Priority date Publication date Assignee Title
CN108966095B (en) 2018-08-07 2024-06-18 张永春 Speaker unit and speaker device

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Also Published As

Publication number Publication date
EP2700247A1 (en) 2014-02-26
US9544693B2 (en) 2017-01-10
CN103650530A (en) 2014-03-19
WO2012143657A1 (en) 2012-10-26
JP6014118B2 (en) 2016-10-25
FR2974476A1 (en) 2012-10-26
US20140037128A1 (en) 2014-02-06
JP2014516497A (en) 2014-07-10

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