EP3391664A1 - Acoustic membrane for a loudspeaker and corresponding loudspeaker - Google Patents

Acoustic membrane for a loudspeaker and corresponding loudspeaker

Info

Publication number
EP3391664A1
EP3391664A1 EP16812982.3A EP16812982A EP3391664A1 EP 3391664 A1 EP3391664 A1 EP 3391664A1 EP 16812982 A EP16812982 A EP 16812982A EP 3391664 A1 EP3391664 A1 EP 3391664A1
Authority
EP
European Patent Office
Prior art keywords
membrane
annular
fold
central portion
coil
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
EP16812982.3A
Other languages
German (de)
French (fr)
Other versions
EP3391664B1 (en
Inventor
Giuliano NICOLETTI
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.)
Focal JMLab SAS
Original Assignee
Focal JMLab SAS
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 Focal JMLab SAS filed Critical Focal JMLab SAS
Publication of EP3391664A1 publication Critical patent/EP3391664A1/en
Application granted granted Critical
Publication of EP3391664B1 publication Critical patent/EP3391664B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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
    • H04R9/06—Loudspeakers
    • 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
    • H04R7/14—Non-planar diaphragms or cones corrugated, pleated or ribbed
    • 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
    • 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

Definitions

  • the invention relates to the field of acoustic equipment. It relates to an acoustic speaker diaphragm, and a speaker equipped with such a membrane.
  • the invention is more specifically a new form of acoustic membrane, particularly adapted for the realization of compact speaker and tweeter type.
  • a loudspeaker comprises a fixed frame and a circular acoustic membrane (or diaphragm) connected to the frame and mechanically coupled to a coil via a cylindrical support.
  • the winding is in particular mobile in the annular air gap of a magnetic system.
  • the magnetic system is configured to generate a magnetic field in the gap.
  • the winding is configured to receive electrical signals representative of the sound signal to be generated. On the basis of these received electrical signals and the magnetic field present in the gap, the coil moves in the air gap, thereby causing the displacement of the membrane.
  • each element fitted to the loudspeaker is sized to allow the reproduction of sounds belonging to a predetermined audible frequency range.
  • speakers configured for the return of low frequencies ( ⁇ 150Hz), intermediate frequencies (of the order of 150 to 2500Hz) and high frequencies (between 200Hz and 20KHz), these speakers are particularly known as “boomer” or "woofer”, “medium” and “tweeter” respectively.
  • the membrane is generally in the form of a cone for woofers and mediums, and in the form of a rigid or flexible dome for mediums and tweeters, with a convexity turned towards the outside of the top loudspeaker.
  • the Applicant has also proposed in the patent application published under the number EP1618761, a tweeter type speaker equipped with a dome membrane positioned in a manner reverse to what is generally achieved, that is to say that the concavity of the dome is turned towards the outside of the loudspeaker in the direction of the axis of movement of the coil or support.
  • the cylindrical support of the coil is simply fixed on the convex face and half-height of the dome, which allows to uniformly put the entire surface of the membrane in motion.
  • this inverted dome configuration does not allow the realization of compact speaker especially in the direction of travel of the coil. Indeed, to ensure maximum excursion of the coil and therefore the membrane, it is necessary to increase the depth of the frame in which are housed the magnetic system and the winding. Moreover, in order to reject the own resonance frequency of the membrane outside the audible frequency band, and in particular to push as high as possible its own resonance frequency, the membrane must necessarily be made of rigid material, especially in beryllium. In addition, this solution does not guarantee accurate positioning of the coil support relative to the center of the membrane. This solution also does not offer optimum geometrical rigidity of the coupling point with the winding support. This weakness has the effect of considerably reducing the frequency of the first mode of resonance and thus limiting the useful bandwidth of the tweeter.
  • the present invention therefore aims to improve the solution presented above.
  • the present invention is intended to provide an alternative acoustic membrane solution for the realization of compact speaker, especially in the direction of travel of the coil.
  • the solution of the invention also aims to propose a solution that allows the use of flexible or rigid material for the membrane, as well as easy and precise positioning of the coil support on the membrane.
  • the invention thus relates to a circular-shaped acoustic membrane having an upper surface and an opposite lower surface. This membrane is therefore intended to be coupled, at its lower surface, to a mobile winding via a support.
  • the membrane has a concentric annular fold delimiting in the membrane, a circular central portion and an annular peripheral portion, the central portion having a concavity turned towards the upper surface of the membrane.
  • the inner edge of the fold is carried by the lower surface and includes or forms an attachment surface for coupling the support of the coil.
  • the acoustic membrane of the invention has a substantially M-shaped profile. More particularly, the acoustic membrane is provided with an annular fold substantially centered on the center of the membrane, as well as two portions of part and other of this annular fold.
  • the portion of the membrane inside the annular fold is called the central portion and has a non-zero diameter and a concavity intended to be turned towards the outside of the speaker.
  • the portion of the membrane outside the annular fold is called the annular portion and has a free outer edge for attachment to a chassis of a speaker generally via a suspension.
  • this annular portion may also have a concavity intended to be turned towards the outside of the speaker.
  • the inner edge of the fold is in particular intended to be in contact with the winding support.
  • such a configuration facilitates a precise and correct positioning of the coil support on the membrane since this position is identified on the membrane by the fold thus formed.
  • the particular positioning of the coil support on the membrane has a very favorable effect compared to the resonance phenomenon.
  • the upper part of the coil support that is to say the part in contact with the membrane, participates in the appearance of unwanted deformations of the membrane may cause distortions of the audio signal.
  • the geometry of the membrane of the invention makes it possible to constrain the upper part of the coil support to prevent non-coherent deformation of the membrane in a range of audible frequencies. given, and therefore increase the breaking frequency (or break-up frequency) of the membrane.
  • centroid of the membrane is made closer to the bonding plane of the suspension. This configuration makes it possible to reduce the appearance of non-linear oscillation movements of the membrane surface and therefore the risk of tilts (usually referred to as "rocking mode") of the membrane likely to cause mechanical shocks. of the coil against the walls of the gap. It is then possible to attach the membrane to the chassis of the speaker via less rigid suspensions.
  • the fold as well as the two portions of the membrane can be obtained by forming a single sheet of material.
  • the fold can also be obtained by assembling the two distinct portions of identical or different materials.
  • materials that are qualified as rigid in the field of loudspeakers of the tweeter or medium type for example aluminum or Kevlar TM, which have the particular advantage of having a high modulus of elasticity. , especially greater than 70 GPa.
  • flexible materials for example paper or silk, having in particular a coefficient of elasticity of less than 1 GPa.
  • the central portion and the annular portion are made of different materials.
  • the method may consist in forming the central portion and the annular portion separately, and then assemble the peripheral edge of the central portion directly with the inner edge of the annular portion.
  • the assembly can be obtained by a conventional bonding method.
  • the annular fold thus formed generally has an opening angle substantially less than 180 °, for example between 130 ° and 150 °.
  • the opening angle of the fold can be an acute angle.
  • the fold may be such that the tangent to the lower surface of the central portion at a point on the edge of the fold and the tangent to the lower surface of the annular portion at this point form between they an acute angle.
  • the opening angle of the fold may be such that:
  • the main axis of symmetry of the membrane is in particular the radial axis of symmetry of the membrane and is generally substantially parallel to the direction of travel of the coil or to the main axis of the support.
  • the various dimensions of the membrane are determined in particular according to the desired response curve and of the material or materials constituting the membrane.
  • the value of the first angle and the value of the second angle may be identical or different, and preferably between 80 ° and 50 °;
  • the ratio of the surfaces of the central portion and the annular portion may be between 0.8 and 1.6;
  • the radius of curvature of the upper surface of the central portion is preferably substantially equal to the radius of curvature of the upper surface of the annular portion.
  • the invention also relates to a loudspeaker, for example of the tweeter type, comprising:
  • a mobile assembly relative to the chassis comprising:
  • the acoustic membrane as defined above with a concavity turned towards the outside of the loudspeaker, the membrane being attached to the frame at its peripheral edge via a suspension;
  • FIG. 1 is a perspective view in section of the acoustic membrane according to one embodiment of the invention.
  • FIG. 2 is a side view and in section along the axis AA 'of the acoustic membrane of Figure 1;
  • FIG. 3 is an enlargement of region V of FIG. 2;
  • FIG. 4 is a perspective view in section of a loudspeaker equipped with an acoustic membrane according to one embodiment of the invention.
  • the acoustic membrane 1 shown in FIGS. 1 to 3 generally has a substantially M-shaped profile.
  • the acoustic membrane 1 is circular and in particular has a lower surface 10 and an opposite upper surface 11.
  • an angular zone in the form of an annular fold 12 which defines in the membrane 1 a central portion 13 and an annular portion 14.
  • the annular fold 12 is centered on the center of the circular membrane and the internal edge 120 of the fold 12 is in particular carried by the lower surface 10 of the membrane 1.
  • the opening angle of the fold 12 is such that the central portion 13 and the annular portion 14 are curved, with a concavity turned in a direction opposite to that of the opening angle of the fold 12.
  • the radius of curvature of the central portion is preferably close to that of the annular portion. However, these two radii of curvature can also be different to adapt the main resonance frequency of the central portion and that of the annular portion to the desired performance.
  • This membrane may be obtained by forming a single sheet of material, monolayer or multilayer type, but may also result from an assembly, for example by gluing, two separate preformed pieces.
  • the assembly makes it possible in particular to produce a membrane having the central and annular portions made of different materials, adapted to the desired response curve.
  • the central portion may be of a material qualified as rigid and the annular portion may be of flexible material qualified. For example, it is possible to consider the following combinations: Aluminum-Silk, Aluminum-Mylar TM, Aluminum-Paper.
  • this membrane 1 is intended to be coupled to a frame 2 at its peripheral edge 15, and to a cylindrical support 3 of excitation coil 4 at the level of the inner edge 120 of the annular fold 12. Thanks to the fold 12 formed in the membrane, the precise positioning of the support 3 on the membrane is facilitated.
  • the main axis z of radial symmetry of the membrane 1 corresponds substantially to the main axis of the cylindrical support 3 and is substantially parallel to the direction of travel of the coil in operation.
  • the membrane forms acute angles with respect to the coil support cylinder.
  • the tangent to the lower surface 10 of the central portion 13 at a point on the edge of the fold 12 and the coil support at the same point form between them a first acute angle ai.
  • the tangent to the lower surface 10 of the annular portion 14 at the same point and the coil support in this same point form between them a second angle has 2 acute.
  • the two angles ai and a 2 may be equal or different and may be modulated depending on the desired frequency response. In general, for the same material, the sharper the angles, the higher the stiffness of the membrane increases and the higher the resonant frequency of the membrane itself.
  • the geometry of the membrane and the material (s) used (s) have an influence on the acoustic and mechanical behavior of the membrane.
  • the different dimensions of the membrane can be set depending in particular on the desired response curve and the material or materials used for the membrane.
  • RI the radius of curvature of the central portion
  • R2 the radius of curvature of the annular portion
  • the membrane is made of Kevlar TM and is intended to be coupled with a coil support 20mm in diameter.
  • the membrane preferably has the following dimensions:
  • the membrane is Kevlar TM and is intended to be coupled with a 25mm diameter coil support.
  • the membrane preferably has the following dimensions:
  • the membrane is made of aluminum and is intended to be coupled with a coil support 20 mm in diameter.
  • the membrane preferably has the following dimensions:
  • the membrane has an aluminum central portion and an annular Mylar TM portion, and is intended to be coupled with a 25mm diameter coil support.
  • the membrane preferably has the following dimensions:
  • FIG. 4 a speaker equipped with the acoustic membrane described above.
  • This loudspeaker is in particular a tweeter and therefore comprises the frame 2 forming a housing in which is disposed a magnetic circuit 5 configured to generate a magnetic field in an annular gap 50.
  • the acoustic membrane provided with the annular fold 12 and the central and annular portions 13, 14.
  • the peripheral edge 15 of this membrane 1 is attached to the frame 2 via a suspension 6.
  • the acoustic membrane is arranged so that the concavities of the central and annular portions 13, 14 are directed towards the outside of the loudspeaker.
  • the cylindrical support 3 of the excitation coil 4 is fixed to the inner edge 120 of the fold 12 of the diaphragm and the coil 4 is positioned in the gap 50. It is noted that this speaker can be relatively compact in the as it is not necessary to have a deep housing to ensure optimal excursion of the coil.
  • the particular geometry of the invention therefore makes it possible to propose a more efficient acoustic membrane with respect to existing membranes.
  • the solution of the invention makes it possible in particular:

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

Abstract

A circular acoustic membrane (1) having an upper surface (11) and an opposite lower surface (10), said membrane (1) being intended to be coupled at the lower surface (10) thereof to a mobile winding (4) via a support (3). The membrane (1) has an annular fold (12) concentrically delimiting, in the membrane (1), a circular central portion (13) and an annular peripheral portion (14). In addition, the central portion (13) has a concavity turned toward the upper surface and the internal edge (120) of the fold (12) is carried by the lower surface (10) and comprises an attachment surface intended for the coupling of said support (3) of the coil.

Description

MEMBRANE ACOUSTIQUE POUR HAUT-PARLEUR ET HAUT-PARLEUR  ACOUSTIC MEMBRANE FOR SPEAKER AND SPEAKER
CORRESPONDANT  CORRESPONDING
Domaine technique Technical area
L'invention se rattache au domaine du matériel acoustique. Elle concerne une membrane acoustique pour haut-parleur, ainsi qu'un haut-parleur équipé d'une telle membrane. L'invention vise plus spécifiquement une nouvelle forme de membrane acoustique, adaptée notamment pour la réalisation de haut-parleur compact et de type tweeter. The invention relates to the field of acoustic equipment. It relates to an acoustic speaker diaphragm, and a speaker equipped with such a membrane. The invention is more specifically a new form of acoustic membrane, particularly adapted for the realization of compact speaker and tweeter type.
Technique antérieure Prior art
De façon générale, un haut-parleur comprend un châssis fixe et une membrane (ou diaphragme) acoustique circulaire reliée au châssis et couplée mécaniquement à un bobinage via un support cylindrique. Le bobinage est notamment mobile dans l'entrefer annulaire d'un système magnétique. En pratique, le système magnétique est configuré pour générer dans l'entrefer un champ magnétique. En outre, le bobinage est configuré pour recevoir des signaux électriques représentatifs du signal sonore à générer. Sur la base de ces signaux électriques reçus et du champ magnétique présent dans l'entrefer, le bobinage se déplace dans l'entrefer, entraînant de ce fait le déplacement de la membrane. In general, a loudspeaker comprises a fixed frame and a circular acoustic membrane (or diaphragm) connected to the frame and mechanically coupled to a coil via a cylindrical support. The winding is in particular mobile in the annular air gap of a magnetic system. In practice, the magnetic system is configured to generate a magnetic field in the gap. In addition, the winding is configured to receive electrical signals representative of the sound signal to be generated. On the basis of these received electrical signals and the magnetic field present in the gap, the coil moves in the air gap, thereby causing the displacement of the membrane.
En pratique, chaque élément équipant le haut-parleur est dimensionné pour permettre la restitution des sons appartenant à une plage de fréquences audibles prédéterminée. On distingue par exemple des haut-parleurs configurés pour la restitution des basses fréquences (<150Hz), des fréquences intermédiaires (de l'ordre de 150 à 2500Hz) et des hautes fréquences (entre 200Hz et 20KHz), ces haut-parleurs sont notamment connus sous le nom de « boomer » ou « woofer », « médium » et « tweeter » respectivement. In practice, each element fitted to the loudspeaker is sized to allow the reproduction of sounds belonging to a predetermined audible frequency range. There are for example speakers configured for the return of low frequencies (<150Hz), intermediate frequencies (of the order of 150 to 2500Hz) and high frequencies (between 200Hz and 20KHz), these speakers are particularly known as "boomer" or "woofer", "medium" and "tweeter" respectively.
En particulier, la membrane se présente généralement sous la forme d'un cône pour les woofers et les médiums, et sous la forme d'un dôme rigide ou souple pour les médium et les tweeters, avec une convexité tournée vers l'extérieur du haut-parleur. La Demanderesse a par ailleurs proposée dans la demande de brevet publiée sous le numéro EP1618761, un haut-parleur de type tweeter équipé d'une membrane en dôme positionnée de manière inverse à ce qui est généralement réalisé, c'est-à-dire que la concavité du dôme est tournée vers l'extérieur du haut-parleur dans la direction de l'axe de déplacement de la bobine ou du support. Le support cylindrique du bobinage est simplement fixé sur la face convexe et à mi-hauteur du dôme, ce qui permet de mettre uniformément toute la surface de la membrane en mouvement. In particular, the membrane is generally in the form of a cone for woofers and mediums, and in the form of a rigid or flexible dome for mediums and tweeters, with a convexity turned towards the outside of the top loudspeaker. The Applicant has also proposed in the patent application published under the number EP1618761, a tweeter type speaker equipped with a dome membrane positioned in a manner reverse to what is generally achieved, that is to say that the concavity of the dome is turned towards the outside of the loudspeaker in the direction of the axis of movement of the coil or support. The cylindrical support of the coil is simply fixed on the convex face and half-height of the dome, which allows to uniformly put the entire surface of the membrane in motion.
Cependant, cette configuration en dôme inversé n'autorise pas la réalisation de haut-parleur compact notamment dans la direction de déplacement de la bobine. En effet, pour garantir une excursion maximale de la bobine et donc de la membrane, il est nécessaire d'augmenter la profondeur du châssis dans lequel sont logés le système magnétique et le bobinage. Par ailleurs, afin de rejeter la fréquence de résonance propre de la membrane en dehors de la bande de fréquence audible, et en particulier pour repousser le plus haut possible sa fréquence de résonance propre, la membrane doit nécessairement être réalisée en matériau rigide, notamment en béryllium. En outre, cette solution ne garantit pas un positionnement précis du support de bobine par rapport au centre de la membrane. Cette solution n'offre également pas une rigidité géométrique optimale du point de couplage avec le support du bobinage. Cette faiblesse a pour conséquence de baisser considérablement la fréquence du premier mode de résonance et donc de limiter la bande passante utile du tweeter. However, this inverted dome configuration does not allow the realization of compact speaker especially in the direction of travel of the coil. Indeed, to ensure maximum excursion of the coil and therefore the membrane, it is necessary to increase the depth of the frame in which are housed the magnetic system and the winding. Moreover, in order to reject the own resonance frequency of the membrane outside the audible frequency band, and in particular to push as high as possible its own resonance frequency, the membrane must necessarily be made of rigid material, especially in beryllium. In addition, this solution does not guarantee accurate positioning of the coil support relative to the center of the membrane. This solution also does not offer optimum geometrical rigidity of the coupling point with the winding support. This weakness has the effect of considerably reducing the frequency of the first mode of resonance and thus limiting the useful bandwidth of the tweeter.
Exposé de l'invention Dans ce contexte, la présente invention vise donc à améliorer la solution présentée ci-avant. SUMMARY OF THE INVENTION In this context, the present invention therefore aims to improve the solution presented above.
En particulier, la présente invention a notamment pour but de proposer une solution alternative de membrane acoustique permettant la réalisation de haut-parleur compact, notamment dans la direction de déplacement de la bobine. In particular, the present invention is intended to provide an alternative acoustic membrane solution for the realization of compact speaker, especially in the direction of travel of the coil.
La solution de l'invention vise également à proposer une solution qui autorise l'utilisation de matériau souple ou rigide pour la membrane, ainsi qu'un positionnement aisé et précis du support de bobine sur la membrane. L'invention a ainsi pour objet une membrane acoustique de forme circulaire présentant une surface supérieure et une surface inférieure opposée. Cette membrane est donc destinée à être couplée, au niveau de sa surface inférieure, à un bobinage mobile via un support. The solution of the invention also aims to propose a solution that allows the use of flexible or rigid material for the membrane, as well as easy and precise positioning of the coil support on the membrane. The invention thus relates to a circular-shaped acoustic membrane having an upper surface and an opposite lower surface. This membrane is therefore intended to be coupled, at its lower surface, to a mobile winding via a support.
Conformément à l'invention, la membrane présente un pli annulaire concentrique délimitant dans la membrane, une portion centrale circulaire et une portion périphérique annulaire, la portion centrale présentant une concavité tournée vers la surface supérieure de la membrane. En outre, l'arête interne du pli est portée par la surface inférieure et comprend ou forme une surface d'attache destinée au couplage du support de la bobine. According to the invention, the membrane has a concentric annular fold delimiting in the membrane, a circular central portion and an annular peripheral portion, the central portion having a concavity turned towards the upper surface of the membrane. In addition, the inner edge of the fold is carried by the lower surface and includes or forms an attachment surface for coupling the support of the coil.
Ainsi, la membrane acoustique de l'invention présente un profil sensiblement en forme de M. Plus particulièrement, la membrane acoustique est pourvue d'un pli annulaire sensiblement centré sur le centre de la membrane, ainsi que de deux portions de part et d'autre de ce pli annulaire. La portion de la membrane à l'intérieur du pli annulaire est appelée portion centrale et présente un diamètre non nul et une concavité destinée à être tournée vers l'extérieur du haut-parleur. La portion de la membrane à l'extérieur du pli annulaire est appelée portion annulaire et présente un bord externe libre destiné à être fixé à un châssis d'un haut-parleur via généralement une suspension. En pratique, cette portion annulaire peut également présenter une concavité destinée à être tournée vers l'extérieur du haut-parleur. L'arête interne du pli est notamment destinée à être en contact avec le support du bobinage. Thus, the acoustic membrane of the invention has a substantially M-shaped profile. More particularly, the acoustic membrane is provided with an annular fold substantially centered on the center of the membrane, as well as two portions of part and other of this annular fold. The portion of the membrane inside the annular fold is called the central portion and has a non-zero diameter and a concavity intended to be turned towards the outside of the speaker. The portion of the membrane outside the annular fold is called the annular portion and has a free outer edge for attachment to a chassis of a speaker generally via a suspension. In practice, this annular portion may also have a concavity intended to be turned towards the outside of the speaker. The inner edge of the fold is in particular intended to be in contact with the winding support.
Tout d'abord, une telle configuration facilite un positionnement précis et correct du support de bobine sur la membrane puisque cette position est identifiée sur la membrane par le pli ainsi formé. First, such a configuration facilitates a precise and correct positioning of the coil support on the membrane since this position is identified on the membrane by the fold thus formed.
Ensuite, le positionnement particulier du support de bobine sur la membrane présente un effet très favorable par rapport au phénomène de résonnance. En effet, classiquement, la partie haute du support de bobine, c'est-à-dire la partie en contact avec la membrane, participe à l'apparition des déformations non-désirées de la membrane pouvant engendrer des distorsions du signal audio. La géométrie de la membrane de l'invention, permet de contraindre la partie haute du support de bobine pour éviter une déformation non-cohérente de la membrane dans une gamme de fréquences audibles donnée, et donc d'augmenter la fréquence de rupture (ou break-up frequency) de la membrane. Then, the particular positioning of the coil support on the membrane has a very favorable effect compared to the resonance phenomenon. Indeed, conventionally, the upper part of the coil support, that is to say the part in contact with the membrane, participates in the appearance of unwanted deformations of the membrane may cause distortions of the audio signal. The geometry of the membrane of the invention makes it possible to constrain the upper part of the coil support to prevent non-coherent deformation of the membrane in a range of audible frequencies. given, and therefore increase the breaking frequency (or break-up frequency) of the membrane.
En outre, le barycentre de la membrane est rendu plus proche du plan de collage de la suspension. Cette configuration permet de réduire l'apparition de mouvements d'oscillation non-linéaires de la surface de la membrane et donc le risque de basculements (habituellement désigné sous le nom de « rocking mode ») de la membrane susceptibles d'engendrer des chocs mécaniques de la bobine contre les parois de l'entrefer. Il est alors possible d'attacher la membrane au châssis du haut-parleur via des suspensions moins rigides. In addition, the centroid of the membrane is made closer to the bonding plane of the suspension. This configuration makes it possible to reduce the appearance of non-linear oscillation movements of the membrane surface and therefore the risk of tilts (usually referred to as "rocking mode") of the membrane likely to cause mechanical shocks. of the coil against the walls of the gap. It is then possible to attach the membrane to the chassis of the speaker via less rigid suspensions.
En pratique, le pli ainsi que les deux portions de la membrane peuvent être obtenues par formage d'une unique feuille de matériau. Le pli peut également être obtenu par assemblage des deux portions distinctes en matériaux identiques ou différents. In practice, the fold as well as the two portions of the membrane can be obtained by forming a single sheet of material. The fold can also be obtained by assembling the two distinct portions of identical or different materials.
Par ailleurs, il est possible d'utiliser des matériaux qualifiés de rigide dans le domaine des haut-parleurs de type tweeter ou médium, par exemple en aluminium ou en Kevlar™, qui ont notamment l'avantage de présenter un module d'élasticité élevé, notamment supérieur à 70 GPa. Il est également possible d'utiliser des matériaux qualifiés de souple, par exemple en papier ou en soie, ayant notamment un coefficient d'élasticité inférieur à 1 GPa. En outre, il est possible d'envisager une portion centrale en matériau rigide et une portion annulaire en matériau souple. Bien entendu, l'inverse est également possible, à savoir une portion annulaire en matériau rigide et une portion centrale en matériau souple. Moreover, it is possible to use materials that are qualified as rigid in the field of loudspeakers of the tweeter or medium type, for example aluminum or Kevlar ™, which have the particular advantage of having a high modulus of elasticity. , especially greater than 70 GPa. It is also possible to use flexible materials, for example paper or silk, having in particular a coefficient of elasticity of less than 1 GPa. In addition, it is possible to envisage a central portion of rigid material and an annular portion of flexible material. Of course, the opposite is also possible, namely an annular portion of rigid material and a central portion of flexible material.
Ainsi, dans une variante, la portion centrale et la portion annulaire sont en matériaux différents. Thus, in a variant, the central portion and the annular portion are made of different materials.
Dans ce cas de figure, le procédé peut consister à former la portion centrale et la portion annulaire séparément, puis à assembler le bord périphérique de la portion centrale directement avec le bord interne de la portion annulaire. L'assemblage peut être obtenu par un procédé de collage classique. In this case, the method may consist in forming the central portion and the annular portion separately, and then assemble the peripheral edge of the central portion directly with the inner edge of the annular portion. The assembly can be obtained by a conventional bonding method.
Le pli annulaire ainsi formé présente globalement un angle d'ouverture sensiblement inférieur à 180°, par exemple entre 130° et 150°. Dans un mode de réalisation, l'angle d'ouverture du pli peut être un angle aigu. En d'autres termes, le pli peut être tel que la tangente à la surface inférieure de la portion centrale en un point situé sur l'arête du pli et la tangente à la surface inférieure de la portion annulaire en ce même point, forment entre elles un angle aigu. The annular fold thus formed generally has an opening angle substantially less than 180 °, for example between 130 ° and 150 °. In one embodiment, the opening angle of the fold can be an acute angle. In other words, the fold may be such that the tangent to the lower surface of the central portion at a point on the edge of the fold and the tangent to the lower surface of the annular portion at this point form between they an acute angle.
Dans un autre mode de réalisation, l'angle d'ouverture du pli peut être tel que :In another embodiment, the opening angle of the fold may be such that:
- la tangente à la surface inférieure de la portion centrale en un point situé sur l'arête du pli et un axe principal de symétrie de la membrane forment entre eux un premier angle aigu ; et - the tangent to the lower surface of the central portion at a point on the edge of the fold and a main axis of symmetry of the membrane form between them a first acute angle; and
- la tangente à la surface inférieure de la portion annulaire en ce même point et l'axe principal de symétrie forment entre eux un deuxième angle aigu.  - The tangent to the lower surface of the annular portion at the same point and the main axis of symmetry form between them a second acute angle.
L'axe de symétrie principale de la membrane est notamment l'axe de symétrie radiale de la membrane et est généralement sensiblement parallèle à la direction de déplacement de la bobine ou à l'axe principal du support. The main axis of symmetry of the membrane is in particular the radial axis of symmetry of the membrane and is generally substantially parallel to the direction of travel of the coil or to the main axis of the support.
En pratique, les différentes dimensions de la membrane, telles que par exemple l'angle d'ouverture du pli, le rayon de courbure ou la surface de chacune des portions centrale et annulaire, sont déterminées notamment en fonction de la courbe de réponse souhaitée et du ou des matériaux constituant la membrane. In practice, the various dimensions of the membrane, such as for example the opening angle of the fold, the radius of curvature or the area of each of the central and annular portions, are determined in particular according to the desired response curve and of the material or materials constituting the membrane.
Par exemple : For example :
- la valeur du premier angle et la valeur du deuxième angle peuvent être identiques ou différentes, et de préférence compris entre 80° et 50° ;  the value of the first angle and the value of the second angle may be identical or different, and preferably between 80 ° and 50 °;
- le rapport des surfaces de la portion centrale et de la portion annulaire peut être compris entre 0,8 et 1,6 ; et  - The ratio of the surfaces of the central portion and the annular portion may be between 0.8 and 1.6; and
- le rayon de courbure de la surface supérieure de la portion centrale est de préférence sensiblement égal au rayon de courbure de la surface supérieure de la portion annulaire.  - The radius of curvature of the upper surface of the central portion is preferably substantially equal to the radius of curvature of the upper surface of the annular portion.
Bien entendu, les rayons de courbure respectifs des portions centrale et annulaire peuvent être légèrement différents pour optimiser les deux résonances principales de la membrane. Il est par exemple possible d'envisager un écart de l'ordre de 0,5mm. L'invention a également pour objet un haut-parleur, par exemple de type tweeter, comprenant : Of course, the respective radii of curvature of the central and annular portions may be slightly different to optimize the two main resonances of the membrane. For example, it is possible to envisage a gap of the order of 0.5 mm. The invention also relates to a loudspeaker, for example of the tweeter type, comprising:
- un châssis fixe ;  - a fixed frame;
- un circuit magnétique solidaire du châssis ;  a magnetic circuit integral with the chassis;
- un ensemble mobile par rapport au châssis comprenant : a mobile assembly relative to the chassis comprising:
- la membrane acoustique telle que définie ci-avant, de concavité tournée vers l'extérieur du haut-parleur, la membrane étant rattachée au châssis au niveau de son bord périphérique via une suspension ;  the acoustic membrane as defined above, with a concavity turned towards the outside of the loudspeaker, the membrane being attached to the frame at its peripheral edge via a suspension;
- au moins une bobine d'excitation ; et  at least one excitation coil; and
- un support cylindrique portant ladite bobine et solidarisé à l'arête interne du pli annulaire de la membrane.  - A cylindrical support carrying said coil and secured to the inner edge of the annular fold of the membrane.
Brève description des dessins D'autres caractéristiques et avantages de l'invention ressortiront clairement de la description qui en est faite ci-après, à titre indicatif et nullement limitatif, en référence aux dessins annexés, dans lesquels : BRIEF DESCRIPTION OF THE DRAWINGS Other characteristics and advantages of the invention will emerge clearly from the description which is given below, by way of indication and in no way limitative, with reference to the appended drawings, in which:
- la figure 1 est une vue en perspective et en coupe de la membrane acoustique selon un mode de réalisation de l'invention ;  - Figure 1 is a perspective view in section of the acoustic membrane according to one embodiment of the invention;
- la figure 2 est une vue latérale et en coupe suivant l'axe AA' de la membrane acoustique de la figure 1 ;  - Figure 2 is a side view and in section along the axis AA 'of the acoustic membrane of Figure 1;
- la figure 3 est un agrandissement de la région V de la figure 2 ; et  FIG. 3 is an enlargement of region V of FIG. 2; and
- la figure 4 est une vue en perspective et en coupe d'un haut-parleur équipé d'une membrane acoustique selon un mode de réalisation de l'invention.  FIG. 4 is a perspective view in section of a loudspeaker equipped with an acoustic membrane according to one embodiment of the invention.
On notera que dans ces figures, les mêmes références désignent des éléments identiques ou analogues et les différentes structures ne sont pas à l'échelle. Par ailleurs, seuls les éléments indispensables à la compréhension de l'invention sont représentés sur ces figures pour des raisons de clarté. It will be noted that in these figures, the same references designate identical or similar elements and the different structures are not to scale. Furthermore, only the elements essential to the understanding of the invention are shown in these figures for the sake of clarity.
Description détaillée de l'invention Detailed description of the invention
Comme on peut le constater, la membrane 1 acoustique représentée aux figures 1 à 3 présente globalement un profil en sensiblement en forme de M. En particulier, la membrane 1 acoustique est circulaire et présente notamment une surface inférieure 10 et une surface supérieure 11 opposée. On distingue dans cette membrane 1 une zone anguleuse sous la forme d'un pli annulaire 12 qui définit dans la membrane 1 une portion centrale 13 et une portion annulaire 14. Le pli annulaire 12 est centré sur le centre de la membrane circulaire et l'arête interne 120 du pli 12 est notamment portée par la surface inférieure 10 de la membrane 1. En particulier, l'angle d'ouverture du pli 12 est tel que la portion centrale 13 et la portion annulaire 14 sont courbes, avec une concavité tournée vers une direction opposée à celle de l'angle d'ouverture du pli 12. Le rayon de courbure de la portion centrale est de préférence proche de celui de la portion annulaire. Cependant, ces deux rayons de courbure peuvent également être différents pour adapter la fréquence de résonance principale de la portion centrale et celle de la portion annulaire aux performances recherchées. As can be seen, the acoustic membrane 1 shown in FIGS. 1 to 3 generally has a substantially M-shaped profile. In particular, the acoustic membrane 1 is circular and in particular has a lower surface 10 and an opposite upper surface 11. In this membrane 1 is distinguished an angular zone in the form of an annular fold 12 which defines in the membrane 1 a central portion 13 and an annular portion 14. The annular fold 12 is centered on the center of the circular membrane and the internal edge 120 of the fold 12 is in particular carried by the lower surface 10 of the membrane 1. In particular, the opening angle of the fold 12 is such that the central portion 13 and the annular portion 14 are curved, with a concavity turned in a direction opposite to that of the opening angle of the fold 12. The radius of curvature of the central portion is preferably close to that of the annular portion. However, these two radii of curvature can also be different to adapt the main resonance frequency of the central portion and that of the annular portion to the desired performance.
Cette membrane peut être obtenue par formage d'une unique feuille de matériau, de type monocouche ou multicouches, mais peut également résulter d'un assemblage, par exemple par collage, de deux morceaux distincts préformés. L'assemblage permet notamment de réaliser une membrane ayant les portions centrale et annulaire en matériaux différents, adaptés à la courbe de réponse souhaitée. Ainsi, la portion centrale peut être en matériau qualifié de rigide et la portion annulaire peut être en matériau qualifié de souple. Par exemple, il est possible d'envisager les combinaisons suivantes : Aluminium-Soie, Aluminium-Mylar™, Aluminium-Papier. This membrane may be obtained by forming a single sheet of material, monolayer or multilayer type, but may also result from an assembly, for example by gluing, two separate preformed pieces. The assembly makes it possible in particular to produce a membrane having the central and annular portions made of different materials, adapted to the desired response curve. Thus, the central portion may be of a material qualified as rigid and the annular portion may be of flexible material qualified. For example, it is possible to consider the following combinations: Aluminum-Silk, Aluminum-Mylar ™, Aluminum-Paper.
Comme illustré sur les figures 1 et 2, cette membrane 1 est destinée à être couplée à un châssis 2 au niveau de son bord périphérique 15, et à un support 3 cylindrique de bobine 4 d'excitation au niveau de l'arête interne 120 du pli annulaire 12. Grâce au pli 12 formé dans la membrane, le positionnement précis du support 3 sur la membrane est facilité. En particulier, l'axe principal z de symétrie radial de la membrane 1 correspond sensiblement à l'axe principal du support 3 cylindrique et est sensiblement parallèle à la direction de déplacement de la bobine en fonctionnement. As illustrated in FIGS. 1 and 2, this membrane 1 is intended to be coupled to a frame 2 at its peripheral edge 15, and to a cylindrical support 3 of excitation coil 4 at the level of the inner edge 120 of the annular fold 12. Thanks to the fold 12 formed in the membrane, the precise positioning of the support 3 on the membrane is facilitated. In particular, the main axis z of radial symmetry of the membrane 1 corresponds substantially to the main axis of the cylindrical support 3 and is substantially parallel to the direction of travel of the coil in operation.
Ainsi, de part et d'autre du support de bobine, la membrane forme des angles aigus par rapport au cylindre de support bobine. En particulier, la tangente à la surface inférieure 10 de la portion centrale 13 en un point situé sur l'arête du pli 12 et le support bobine en ce même point, forment entre eux un premier angle ai aigu. De même, la tangente à la surface inférieure 10 de la portion annulaire 14 en ce même point et le support bobine en ce même point, forment entre eux un deuxième angle a2 aigu. Par exemple, les deux angles ai et a2 peuvent être égaux ou différents et peuvent être modulés en fonction de la réponse en fréquence souhaitée. De manière générale, pour un même matériau, plus les angles sont aigus plus la rigidité de la membrane augmente et plus la fréquence de résonnance propre de la membrane est haute. Thus, on either side of the coil support, the membrane forms acute angles with respect to the coil support cylinder. In particular, the tangent to the lower surface 10 of the central portion 13 at a point on the edge of the fold 12 and the coil support at the same point, form between them a first acute angle ai. Similarly, the tangent to the lower surface 10 of the annular portion 14 at the same point and the coil support in this same point, form between them a second angle has 2 acute. For example, the two angles ai and a 2 may be equal or different and may be modulated depending on the desired frequency response. In general, for the same material, the sharper the angles, the higher the stiffness of the membrane increases and the higher the resonant frequency of the membrane itself.
En pratique, la géométrie de la membrane et le ou les matériau(x) utilisé(s) ont une influence sur le comportement acoustique et mécanique de la membrane. De ce fait, les différentes dimensions de la membrane peuvent être fixés en fonction notamment de la courbe de réponse souhaitée et du ou des matériaux utilisés pour la membrane. In practice, the geometry of the membrane and the material (s) used (s) have an influence on the acoustic and mechanical behavior of the membrane. As a result, the different dimensions of the membrane can be set depending in particular on the desired response curve and the material or materials used for the membrane.
Les dimensions de la membrane suivant quatre variantes adaptées notamment pour la réalisation d'un tweeter, sont données ci-après à titre d'exemple non limitatif. The dimensions of the membrane according to four variants adapted in particular for the realization of a tweeter, are given below by way of non-limiting example.
Dans ces quatre variantes, on définit : In these four variants, we define:
51 : la surface de la portion centrale ;  51: the surface of the central portion;
52 : la surface de la portion annulaire ;  52: the surface of the annular portion;
R : le rapport S2/S1 ;  R: the ratio S2 / S1;
RI : le rayon de courbure de la portion centrale ;  RI: the radius of curvature of the central portion;
- R2 : le rayon de courbure de la portion annulaire ;R2: the radius of curvature of the annular portion;
i : le premier angle défini ci-avant ; et  i: the first angle defined above; and
a2 : le deuxième angle défini ci-avant. a 2 : the second angle defined above.
Dans la première variante, la membrane est en Kevlar™ et est destinée à être couplée avec un support de bobine de 20mm de diamètre. Dans cette première variante, la membrane présente de préférence les dimensions suivantes : In the first variant, the membrane is made of Kevlar ™ and is intended to be coupled with a coil support 20mm in diameter. In this first variant, the membrane preferably has the following dimensions:
- SI : 330mm2 - SI: 330mm 2
- S2 : 510mm2 - S2: 510mm 2
- R : 1.55 - R: 1.55
- RI : 18.9mm - RI: 18.9mm
- R2 : 18.9mm - R2: 18.9mm
- i : 58°  - i: 58 °
- a2 : 58° Dans la deuxième variante, la membrane est en Kevlar™ et est destinée à être couplée avec un support de bobine de 25mm de diamètre. Dans cette deuxième variante, la membrane présente de préférence les dimensions suivantes : at 2 : 58 ° In the second variant, the membrane is Kevlar ™ and is intended to be coupled with a 25mm diameter coil support. In this second variant, the membrane preferably has the following dimensions:
- SI : 480mm2 - SI: 480mm 2
- S2 : 650mm2 - S2: 650mm 2
- R : 1.35  - R: 1.35
- RI : 19.5mm  - RI: 19.5mm
- R2 : 19mm  - R2: 19mm
- i : 52°  i: 52 °
- a2 : 50° - at 2 : 50 °
Dans la troisième variante, la membrane est en aluminium et est destinée à être couplée avec un support de bobine de 20mm de diamètre. Dans cette troisième variante, la membrane présente de préférence les dimensions suivantes : In the third variant, the membrane is made of aluminum and is intended to be coupled with a coil support 20 mm in diameter. In this third variant, the membrane preferably has the following dimensions:
- SI : 330mm2 - SI: 330mm 2
- S2 : 440mm2 - S2: 440mm 2
- R : 1.33 - R: 1.33
- RI : 24mm  - RI: 24mm
- R2 : 24mm  - R2: 24mm
- i : 65° i: 65 °
- a2 : 70° at 2 : 70 °
Dans la quatrième variante, la membrane présente une portion centrale en aluminium et une portion annulaire en Mylar™, et est destinée à être couplée avec un support de bobine de 25mm de diamètre. Dans cette quatrième variante, la membrane présente de préférence les dimensions suivantes : In the fourth variant, the membrane has an aluminum central portion and an annular Mylar ™ portion, and is intended to be coupled with a 25mm diameter coil support. In this fourth variant, the membrane preferably has the following dimensions:
- SI : 480mm2 - SI: 480mm 2
- S2 : 600mm2 - S2: 600mm 2
- R : 1.25 - R: 1.25
- RI : 22mm - RI: 22mm
- R2 : 20mm  - R2: 20mm
- ai : 60°  - have: 60 °
- a2 : 58° Sur la figure 4 est représenté un haut-parleur équipé de la membrane acoustique décrite ci-dessus. Ce haut-parleur est notamment un tweeter et comprend donc le châssis 2 formant logement dans lequel est disposé un circuit magnétique 5 configuré pour générer un champ magnétique dans un entrefer 50 annulaire. On retrouve également la membrane acoustique pourvue du pli 12 annulaire et des portions centrale et annulaire 13, 14. Le bord périphérique 15 de cette membrane 1 est attaché au châssis 2 via une suspension 6. En particulier, la membrane acoustique est disposée de sorte que les concavités des portions centrale et annulaire 13, 14 sont dirigées vers l'extérieur du haut- parleur. Le support 3 cylindrique de la bobine 4 d'excitation est fixé à l'arête interne 120 du pli 12 de la membrane et la bobine 4 est positionnée dans l'entrefer 50. On remarque que ce haut-parleur peut être relativement compact dans la mesure où il n'est pas nécessaire d'avoir un logement de grande profondeur pour assurer une excursion optimale de la bobine. La géométrie particulière de l'invention permet donc de proposer une membrane acoustique plus performante par rapport aux membranes existantes. En particulier, la solution de l'invention permet notamment : at 2 : 58 ° In Figure 4 is shown a speaker equipped with the acoustic membrane described above. This loudspeaker is in particular a tweeter and therefore comprises the frame 2 forming a housing in which is disposed a magnetic circuit 5 configured to generate a magnetic field in an annular gap 50. There is also the acoustic membrane provided with the annular fold 12 and the central and annular portions 13, 14. The peripheral edge 15 of this membrane 1 is attached to the frame 2 via a suspension 6. In particular, the acoustic membrane is arranged so that the concavities of the central and annular portions 13, 14 are directed towards the outside of the loudspeaker. The cylindrical support 3 of the excitation coil 4 is fixed to the inner edge 120 of the fold 12 of the diaphragm and the coil 4 is positioned in the gap 50. It is noted that this speaker can be relatively compact in the as it is not necessary to have a deep housing to ensure optimal excursion of the coil. The particular geometry of the invention therefore makes it possible to propose a more efficient acoustic membrane with respect to existing membranes. In particular, the solution of the invention makes it possible in particular:
- de réaliser une membrane avec différents matériaux souples ou rigides ;  to produce a membrane with different flexible or rigid materials;
- de positionner précisément le support de bobine sur la membrane ;  positioning the coil support precisely on the membrane;
- d'augmenter la valeur de la fréquence de rupture mécanique de la membrane, notamment au-delà des hautes fréquences audibles ; - Increase the value of the frequency of mechanical rupture of the membrane, especially beyond audible high frequencies;
- de limiter les effets de basculement de la membrane ;  to limit the effects of tilting of the membrane;
- de réaliser un haut-parleur plus compact.  - to make a more compact speaker.

Claims

REVENDICATIONS
1. Membrane (1) acoustique de forme circulaire présentant une surface supérieure (11) et une surface inférieure (10) opposée, ladite membrane (1) étant destinée à être couplée au niveau de sa surface inférieure (10) à un bobinage mobile (4) via un support (3),A circular-shaped acoustic membrane (1) having an upper surface (11) and an opposed lower surface (10), said membrane (1) being adapted to be coupled at its lower surface (10) to a moving coil ( 4) via a support (3),
- la membrane (1) présentant un pli annulaire (12) concentrique délimitant dans la membrane (1), une portion centrale (13) circulaire et une portion périphérique annulaire (14) ; - The membrane (1) having a concentric annular fold (12) delimiting in the membrane (1), a central portion (13) circular and an annular peripheral portion (14);
- la portion centrale (13) présentant une concavité tournée vers la surface supérieure ; et- the central portion (13) having a concavity facing the upper surface; and
- l'arête interne (120) du pli (12) étant portée par la surface inférieure (10) et comprenant une surface d'attache destinée au couplage dudit support (3) de la bobine the inner edge (120) of the fold (12) being carried by the lower surface (10) and comprising an attachment surface for coupling said support (3) of the coil
caractérisée en ce que la tangente à la surface inférieure (10) de la portion centrale (13) en un point situé sur l'arête du pli (12) et la tangente à la surface inférieure (10) de la portion annulaire (14) en ce même point, forment entre elles un angle aigu.  characterized in that the tangent to the lower surface (10) of the central portion (13) at a point on the edge of the fold (12) and the tangent to the bottom surface (10) of the annular portion (14) in this same point form an acute angle between them.
2. Membrane acoustique selon la revendication 1, caractérisée en ce que la portion centrale (13) et la portion annulaire (14) sont en matériaux différents. 2. Acoustic membrane according to claim 1, characterized in that the central portion (13) and the annular portion (14) are of different materials.
3. Membrane acoustique selon l'une des revendications 1 ou 2, caractérisé en ce que :3. Acoustic membrane according to one of claims 1 or 2, characterized in that:
- la tangente à la surface inférieure de la portion centrale (13) en un point situé sur l'arête du pli (12) et un axe de symétrie principal (z) de la membrane (1) forment entre eux un premier angle (ai) aigu ; et - the tangent to the lower surface of the central portion (13) at a point on the edge of the fold (12) and a main axis of symmetry (z) of the membrane (1) form between them a first angle ) acute; and
- la tangente à la surface inférieure de la portion annulaire (14) en ce même point et l'axe de symétrie principal (z) forment entre eux un deuxième angle (a2) aigu. - The tangent to the lower surface of the annular portion (14) at the same point and the main axis of symmetry (z) form between them a second angle (a 2 ) acute.
4. Membrane acoustique selon l'une des revendications 1 à 3, caractérisé en ce que le rapport des surfaces de la portion centrale (13) et de la portion annulaire (14) est compris entre 0,8 et 1,6. 4. Acoustic membrane according to one of claims 1 to 3, characterized in that the ratio of the surfaces of the central portion (13) and the annular portion (14) is between 0.8 and 1.6.
5. Membrane acoustique selon l'une des revendications 1 à 4, caractérisé en ce que le rayon de courbure de la portion centrale (13) est sensiblement égal au rayon de courbure de la portion annulaire (14). 5. acoustic membrane according to one of claims 1 to 4, characterized in that the radius of curvature of the central portion (13) is substantially equal to the radius of curvature of the annular portion (14).
6. Haut-parleur comprenant : 6. Speaker comprising:
- un châssis (2) fixe ;  - a frame (2) fixed;
- un circuit magnétique (5) solidaire du châssis (2) ;  a magnetic circuit (5) integral with the chassis (2);
- un ensemble mobile par rapport au châssis (2) comprenant :  a movable assembly relative to the chassis (2) comprising:
- la membrane (1) acoustique selon l'une des revendications 1 à 6, de concavité tournée vers l'extérieur du haut-parleur ;  - The membrane (1) acoustic according to one of claims 1 to 6, concavity facing the outside of the speaker;
- une bobine (4) d'excitation ;  an excitation coil (4);
- un support (3) cylindrique portant ladite bobine (4) et solidarisé à l'arête interne (120) du pli (12) annulaire de la membrane (1).  - A cylindrical support (3) carrying said coil (4) and secured to the inner edge (120) of the annular fold (12) of the membrane (1).
EP16812982.3A 2015-12-14 2016-11-15 Acoustic membrane for a loudspeaker and corresponding loudspeaker Active EP3391664B1 (en)

Applications Claiming Priority (2)

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FR1562261A FR3045264B1 (en) 2015-12-14 2015-12-14 ACOUSTIC MEMBRANE FOR SPEAKER AND CORRESPONDING SPEAKER
PCT/FR2016/052962 WO2017103360A1 (en) 2015-12-14 2016-11-15 Acoustic membrane for a loudspeaker and corresponding loudspeaker

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CN110620974B (en) * 2018-06-19 2022-01-18 宁波升亚电子有限公司 High pitch loudspeaker and manufacturing method thereof
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FR3045264B1 (en) 2019-01-25
US10820111B2 (en) 2020-10-27
US20200053474A1 (en) 2020-02-13
FR3045264A1 (en) 2017-06-16
CN108370473B (en) 2020-07-31
WO2017103360A1 (en) 2017-06-22
EP3391664B1 (en) 2020-01-15

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