EP3391664B1 - Acoustic membrane for a loudspeaker and corresponding loudspeaker - Google Patents

Acoustic membrane for a loudspeaker and corresponding loudspeaker Download PDF

Info

Publication number
EP3391664B1
EP3391664B1 EP16812982.3A EP16812982A EP3391664B1 EP 3391664 B1 EP3391664 B1 EP 3391664B1 EP 16812982 A EP16812982 A EP 16812982A EP 3391664 B1 EP3391664 B1 EP 3391664B1
Authority
EP
European Patent Office
Prior art keywords
membrane
annular
fold
central portion
loudspeaker
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.)
Active
Application number
EP16812982.3A
Other languages
German (de)
French (fr)
Other versions
EP3391664A1 (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

Images

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 membrane for loudspeakers, as well as a loudspeaker equipped with such a membrane.
  • the invention relates more specifically to a new form of acoustic membrane, adapted in particular for the production of a compact speaker and of the tweeter type.
  • a loudspeaker comprises a fixed chassis and a circular acoustic membrane (or diaphragm) connected to the chassis and mechanically coupled to a winding via a cylindrical support.
  • the winding is especially mobile in the annular air gap of a magnetic system.
  • the magnetic system is configured to generate a magnetic field in the air gap.
  • the winding is configured to receive electrical signals representative of the sound signal to be generated. On the basis of these electrical signals received and the magnetic field present in the air gap, the coil moves in the air gap, thereby causing the membrane to move.
  • each element equipping the loudspeaker is dimensioned to allow the reproduction of sounds belonging to a predetermined range of audible frequencies.
  • speakers configured for the reproduction of low frequencies ( ⁇ 150Hz), intermediate frequencies (of the order of 150 to 2500Hz) and high frequencies (between 200Hz and 20KHz), these speakers are in particular 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 facing outwards from the top. loudspeaker.
  • this inverted dome configuration does not allow the production of a compact speaker, in particular in the direction of movement of the coil.
  • it is necessary to increase the depth of the chassis in which the magnetic system and the winding are housed.
  • the membrane in order to reject the natural resonance frequency of the membrane outside the audible frequency band, and in particular to push its natural resonance frequency as high as possible, the membrane must necessarily be made of rigid material, in particular in beryllium.
  • this solution does not guarantee precise positioning of the coil support relative to the center of the membrane.
  • This solution also does not offer optimal geometric rigidity of the point of coupling with the winding support. This weakness has the consequence of considerably lowering the frequency of the first resonance mode and therefore of limiting the useful bandwidth of the tweeter.
  • the present invention therefore aims to improve the solution presented above.
  • the aim of the present invention is in particular to propose an alternative solution of acoustic membrane allowing the production of a compact loudspeaker, in particular in the direction of movement of the coil.
  • the solution of the invention also aims to propose a solution which 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 according to claim 1 thus relates to an acoustic membrane of circular shape 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 internal edge of the fold is carried by the lower surface and comprises or forms a fastening surface intended 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 on the side 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 loudspeaker.
  • the portion of the membrane outside the annular fold is called the annular portion and has a free outer edge intended to be fixed to a chassis of a loudspeaker generally via a suspension.
  • this annular portion may also have a concavity intended to be turned towards the outside of the loudspeaker.
  • the internal edge of the fold is in particular intended to be in contact with the winding support.
  • 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 which can 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 avoid non-coherent deformation of the membrane in a range of audible frequencies. given, and therefore to increase the break-up frequency of the membrane.
  • the barycenter 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 rocking (usually referred to as "rocking mode") of the membrane likely to generate mechanical shocks of the coil against the walls of the air 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 separate portions of identical or different materials.
  • materials qualified as rigid in the field of tweeter or mid-range speakers for example aluminum or Kevlar TM, which have the particular advantage of having a high elastic modulus. , especially greater than 70 GPa.
  • materials qualified as flexible for example paper or silk, having in particular a coefficient of elasticity of less than 1 GPa.
  • a central portion made of rigid material and an annular portion made of flexible material for example paper or silk, having in particular a coefficient of elasticity of less than 1 GPa.
  • a central portion made of rigid material and an annular portion made of flexible material Of course, the reverse is also possible, namely an annular portion made of rigid material and a central portion made of flexible material.
  • the central portion and the annular portion are made of different materials.
  • the method can consist in forming the central portion and the annular portion separately, then in assembling the peripheral edge of the central portion directly with the internal edge of the annular portion.
  • the assembly can be obtained by a conventional bonding process.
  • the annular fold thus formed generally has an opening angle substantially less than 180 °.
  • the opening angle of the fold is an acute angle.
  • the fold is such that the tangent to the lower surface of the central portion at a point located on the edge of the fold and the tangent to the lower surface of the annular portion at this same point form between them an acute angle.
  • 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 movement of the coil or to the main axis of the support.
  • the different dimensions of the membrane are determined in particular as a function of the desired response curve and of the material or materials constituting the membrane.
  • the respective radii of curvature of the central and annular portions may be slightly different to optimize the two main resonances of the membrane. It is for example possible to envisage a deviation of the order of 0.5 mm.
  • the acoustic membrane 1 shown in Figures 1 to 3 overall 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 .
  • the annular fold 12 is centered on the center of the circular membrane and the internal edge 120 of the fold 12 is notably 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 turned concavity towards 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.
  • these two radii of curvature can also be different in order to adapt the main resonant frequency of the central portion and that of the annular portion to the desired performance.
  • This membrane can be obtained by forming a single sheet of material, of the monolayer or multilayer type, but can also result from an assembly, for example by gluing, of 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 can be of material qualified as rigid and the annular portion can be of material qualified as flexible.
  • this membrane 1 is intended to be coupled to a chassis 2 at its peripheral edge 15, and to a cylindrical support 3 of excitation coil 4 at the level of the internal 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 movement of the coil in operation.
  • the membrane forms acute angles relative to the coil support cylinder.
  • the tangent to the lower surface 10 of the central portion 13 at a point located on the edge of the fold 12 and the coil support at this same point form between them a first acute angle ⁇ 1 .
  • the tangent to the lower surface 10 of the annular portion 14 at this same point and the coil support at this same point form between them a second acute angle ⁇ 2 .
  • the two angles ⁇ 1 and ⁇ 2 can be equal or different and can be modulated as a function of the desired frequency response. In general, for the same material, the more acute the angles, the more the rigidity of the membrane increases and the higher the natural resonance frequency of the membrane.
  • the geometry of the membrane and the material (s) used have an influence on the acoustic and mechanical behavior of the membrane. Therefore, the different dimensions of the membrane can be fixed depending in particular on the desired response curve and the material or materials used for the membrane.
  • a loudspeaker equipped with the acoustic membrane described above.
  • This loudspeaker is in particular a tweeter and therefore comprises the chassis 2 forming a housing in which is arranged a magnetic circuit 5 configured to generate a magnetic field in an annular air 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 chassis 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 internal edge 120 of the fold 12 of the membrane and the coil 4 is positioned in the air gap 50. It is noted that this loudspeaker can be relatively compact in the since it is not necessary to have a housing of great depth to ensure optimal excursion of the coil.

Landscapes

  • 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)

Description

Domaine techniqueTechnical 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 membrane for loudspeakers, as well as a loudspeaker equipped with such a membrane. The invention relates more specifically to a new form of acoustic membrane, adapted in particular for the production of a compact speaker and of the tweeter type.

Technique antérieurePrior 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.Generally, a loudspeaker comprises a fixed chassis and a circular acoustic membrane (or diaphragm) connected to the chassis and mechanically coupled to a winding via a cylindrical support. The winding is especially mobile in the annular air gap of a magnetic system. In practice, the magnetic system is configured to generate a magnetic field in the air gap. In addition, the winding is configured to receive electrical signals representative of the sound signal to be generated. On the basis of these electrical signals received and the magnetic field present in the air gap, the coil moves in the air gap, thereby causing the membrane to move.

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 equipping the loudspeaker is dimensioned to allow the reproduction of sounds belonging to a predetermined range of audible frequencies. There are, for example, speakers configured for the reproduction of low frequencies (<150Hz), intermediate frequencies (of the order of 150 to 2500Hz) and high frequencies (between 200Hz and 20KHz), these speakers are in particular 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 medium et les tweeters, avec une convexité tournée vers l'extérieur du haut-parleur.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 facing outwards from the top. loudspeaker.

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.The Applicant also proposed in the patent application published under the number EP1618761 , a tweeter type loudspeaker equipped with a dome membrane positioned in 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 winding is simply fixed on the convex face and halfway up the dome, which makes it possible to uniformly set 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 production of a compact speaker, in particular in the direction of movement of the coil. In fact, to guarantee maximum excursion of the coil and therefore of the membrane, it is necessary to increase the depth of the chassis in which the magnetic system and the winding are housed. Furthermore, in order to reject the natural resonance frequency of the membrane outside the audible frequency band, and in particular to push its natural resonance frequency as high as possible, the membrane must necessarily be made of rigid material, in particular in beryllium. In addition, this solution does not guarantee precise positioning of the coil support relative to the center of the membrane. This solution also does not offer optimal geometric rigidity of the point of coupling with the winding support. This weakness has the consequence of considerably lowering the frequency of the first resonance mode and therefore of limiting the useful bandwidth of the tweeter.

Les document US2007/009133 et US2004/170297 proposent un haut-parleur dont la partie centrale présente une concavité tournée vers l'extérieure.The documents US2007 / 009133 and US2004 / 170297 propose a loudspeaker whose central part has a concavity facing outwards.

Exposé de l'inventionStatement of the invention

Dans ce contexte, la présente invention vise donc à améliorer la solution présentée ci-avant.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 aim of the present invention is in particular to propose an alternative solution of acoustic membrane allowing the production of a compact loudspeaker, in particular in the direction of movement 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.The solution of the invention also aims to propose a solution which 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.

L'invention selon la revendication 1 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 invention according to claim 1 thus relates to an acoustic membrane of circular shape 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 internal edge of the fold is carried by the lower surface and comprises or forms a fastening surface intended 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 on the side 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 loudspeaker. The portion of the membrane outside the annular fold is called the annular portion and has a free outer edge intended to be fixed to a chassis of a loudspeaker generally via a suspension. In practice, this annular portion may also have a concavity intended to be turned towards the outside of the loudspeaker. The internal 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 of all, such a configuration facilitates 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 which can 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 avoid non-coherent deformation of the membrane in a range of audible frequencies. given, and therefore to increase the 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 barycenter 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 rocking (usually referred to as "rocking mode") of the membrane likely to generate mechanical shocks of the coil against the walls of the air 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 separate 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.In addition, it is possible to use materials qualified as rigid in the field of tweeter or mid-range speakers, for example aluminum or Kevlar ™, which have the particular advantage of having a high elastic modulus. , especially greater than 70 GPa. It is also possible to use materials qualified as flexible, 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 made of rigid material and an annular portion made of flexible material. Of course, the reverse is also possible, namely an annular portion made of rigid material and a central portion made 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 can consist in forming the central portion and the annular portion separately, then in assembling the peripheral edge of the central portion directly with the internal edge of the annular portion. The assembly can be obtained by a conventional bonding process.

Le pli annulaire ainsi formé présente globalement un angle d'ouverture sensiblement inférieur à 180°.The annular fold thus formed generally has an opening angle substantially less than 180 °.

Dans tout mode de réalisation, l'angle d'ouverture du pli est un angle aigu. En d'autres termes, le pli est 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.In any embodiment, the opening angle of the fold is an acute angle. In other words, the fold is such that the tangent to the lower surface of the central portion at a point located on the edge of the fold and the tangent to the lower surface of the annular portion at this same point form between them an acute angle.

Dans un mode de réalisation, l'angle d'ouverture du 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 un axe principal de symétrie de la membrane forment entre eux un premier angle aigu ; et
  • 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.
In one embodiment, the opening angle of the fold can be such that:
  • the tangent to the lower surface of the central portion at a point located on the edge of the fold and a principal axis of symmetry of the membrane form between them a first acute angle; and
  • the tangent to the lower surface of the annular portion at this 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 movement 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 different dimensions of the membrane, such as for example the opening angle of the fold, the radius of curvature or the surface of each of the central and annular portions, are determined in particular as a function of the desired response curve and of the material or materials constituting the membrane.

Par exemple :

  • la valeur du premier angle et la valeur du deuxième angle peuvent être identiques ou différentes;
  • le rapport des surfaces de la portion centrale et de la portion annulaire peut être compris entre 0,8 et 1,6 ; et
  • 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.
For example :
  • the value of the first angle and the value of the second angle may be the same or different;
  • the ratio of the surfaces of the central portion and of the annular portion can be between 0.8 and 1.6; and
  • 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.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. It is for example possible to envisage a deviation of the order of 0.5 mm.

L'invention a également pour objet un haut-parleur, par exemple de type tweeter, comprenant :

  • un châssis fixe ;
  • un circuit magnétique solidaire du châssis ;
  • un ensemble mobile par rapport au châssis comprenant :
    • 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 ;
    • au moins une bobine d'excitation ; et
    • un support cylindrique portant ladite bobine et solidarisé à l'arête interne du pli annulaire de la membrane.
The subject of the invention is also a loudspeaker, for example of the tweeter type, comprising:
  • a fixed frame;
  • a magnetic circuit secured to the chassis;
  • an assembly movable relative to the chassis comprising:
    • the acoustic membrane as defined above, of concavity turned towards the outside of the loudspeaker, the membrane being attached to the chassis at its peripheral edge via a suspension;
    • at least one excitation coil; and
    • a cylindrical support carrying said coil and secured to the internal edge of the annular fold of the membrane.

Brève description des dessinsBrief description of the drawings

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 :

  • la figure 1 est une vue en perspective et en coupe d'une membrane acoustique ;
  • la figure 2 est une vue latérale et en coupe suivant l'axe AA' de la membrane acoustique de la figure 1 ;
  • la figure 3 est un agrandissement de la région V de la figure 2 ; et
  • la figure 4 est une vue en perspective et en coupe d'un haut-parleur équipé d'une membrane acoustique.
Other characteristics and advantages of the invention will emerge clearly from the description which is given below, for information and in no way limitative, with reference to the appended drawings, in which:
  • the figure 1 is a perspective view in section of an acoustic membrane;
  • the figure 2 is a side view in section along the axis AA ′ of the acoustic membrane of the figure 1 ;
  • the figure 3 is an enlargement of region V of the figure 2 ; and
  • the figure 4 is a perspective view in section of a loudspeaker equipped with an acoustic membrane.

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 analogous elements and the different structures are not to scale. Furthermore, only the elements essential for understanding the invention are shown in these figures for reasons of clarity.

Description détaillée de l'inventionDetailed 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.As can be seen, the acoustic membrane 1 shown in Figures 1 to 3 overall has a substantially M-shaped profile.

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.In particular, the acoustic membrane 1 is circular and in particular has a lower surface 10 and an opposite upper surface 11 . One distinguishes in this membrane 1 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 notably 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 turned concavity towards 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 in order to adapt the main resonant 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 can be obtained by forming a single sheet of material, of the monolayer or multilayer type, but can also result from an assembly, for example by gluing, of 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 can be of material qualified as rigid and the annular portion can be of material qualified as flexible. 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 on Figures 1 and 2 , this membrane 1 is intended to be coupled to a chassis 2 at its peripheral edge 15, and to a cylindrical support 3 of excitation coil 4 at the level of the internal 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 movement 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 α1 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 α2 aigu. Par exemple, les deux angles α1 et α2 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 relative to the coil support cylinder. In particular, the tangent to the lower surface 10 of the central portion 13 at a point located on the edge of the fold 12 and the coil support at this same point, form between them a first acute angle α 1 . Similarly, the tangent to the lower surface 10 of the annular portion 14 at this same point and the coil support at this same point, form between them a second acute angle α 2 . For example, the two angles α 1 and α 2 can be equal or different and can be modulated as a function of the desired frequency response. In general, for the same material, the more acute the angles, the more the rigidity of the membrane increases and the higher the natural resonance frequency of the membrane.

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 have an influence on the acoustic and mechanical behavior of the membrane. Therefore, the different dimensions of the membrane can be fixed 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, qui n'est pas illustratif de l'invention, sont données ci-après à titre d'exemple non limitatif.The dimensions of the membrane according to four variants adapted in particular for the production of a tweeter, which is not illustrative of the invention, are given below by way of nonlimiting example.

Dans ces quatre variantes, on définit :

  • S1 : la surface de la portion centrale ;
  • S2 : la surface de la portion annulaire ;
  • R : le rapport S2/S1 ;
  • R1 : le rayon de courbure de la portion centrale ;
  • R2 : le rayon de courbure de la portion annulaire ;
  • α1 : le premier angle défini ci-avant ; et
  • α2 : le deuxième angle défini ci-avant.
In these four variants, we define:
  • S1: the surface of the central portion;
  • S2: the surface of the annular portion;
  • R: the S2 / S1 ratio;
  • R1: the radius of curvature of the central portion;
  • R2: the radius of curvature of the annular portion;
  • α 1 : the first angle defined above; and
  • α 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 :

  • S1 : 330mm2
  • S2 : 510mm2
  • R : 1.55
  • R1 : 18.9mm
  • R2 : 18.9mm
  • α1 : 58°
  • α2 : 58°
In the first variant, the membrane is made of Kevlar ™ and is intended to be coupled with a coil support of 20mm in diameter. In this first variant, the membrane preferably has the following dimensions:
  • S1: 330mm 2
  • S2: 510mm 2
  • A: 1.55
  • R1: 18.9mm
  • R2: 18.9mm
  • α 1 : 58 °
  • α 2 : 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 :

  • S1 : 480mm2
  • S2 : 650mm2
  • R : 1.35
  • R1 : 19.5mm
  • R2 : 19mm
  • α1 : 52°
  • α2 : 50°
In the second variant, the membrane is made of Kevlar ™ and is intended to be coupled with a 25mm diameter coil support. In this second variant, the membrane preferably has the following dimensions:
  • S1: 480mm 2
  • S2: 650mm 2
  • A: 1.35
  • R1: 19.5mm
  • R2: 19mm
  • α 1 : 52 °
  • α 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 :

  • S1 : 330mm2
  • S2 : 440mm2
  • R : 1.33
  • R1 : 24mm
  • R2 : 24mm
  • α1 : 65°
  • α2 : 70°
In the third variant, the membrane is made of aluminum and is intended to be coupled with a coil support of 20mm in diameter. In this third variant, the membrane preferably has the following dimensions:
  • S1: 330mm 2
  • S2: 440mm 2
  • A: 1.33
  • R1: 24mm
  • R2: 24mm
  • α 1 : 65 °
  • α 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 :

  • S1 : 480mm2
  • S2 : 600mm2
  • R : 1.25
  • R1 : 22mm
  • R2 : 20mm
  • α1 : 60°
  • α2 : 58°
In the fourth variant, the membrane has a central portion in aluminum and an annular portion in Mylar ™, and is intended to be coupled with a 25mm diameter coil support. In this fourth variant, the membrane preferably has the following dimensions:
  • S1: 480mm 2
  • S2: 600mm 2
  • A: 1.25
  • R1: 22mm
  • R2: 20mm
  • α 1 : 60 °
  • α 2 : 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.On the figure 4 depicted is a loudspeaker equipped with the acoustic membrane described above. This loudspeaker is in particular a tweeter and therefore comprises the chassis 2 forming a housing in which is arranged a magnetic circuit 5 configured to generate a magnetic field in an annular air 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 chassis 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 internal edge 120 of the fold 12 of the membrane and the coil 4 is positioned in the air gap 50. It is noted that this loudspeaker can be relatively compact in the since it is not necessary to have a housing of great depth to ensure optimal excursion of the coil.

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 :

  • de réaliser une membrane avec différents matériaux souples ou rigides ;
  • de positionner précisément le support de bobine sur la membrane ;
  • d'augmenter la valeur de la fréquence de rupture mécanique de la membrane, notamment au-delà des hautes fréquences audibles ;
  • de limiter les effets de basculement de la membrane ;
  • de réaliser un haut-parleur plus compact.
The particular geometry of the invention therefore makes it possible to propose an acoustic membrane which is more efficient compared to existing membranes. In particular, the solution of the invention allows in particular:
  • to make a membrane with different flexible or rigid materials;
  • to precisely position the coil support on the membrane;
  • to increase the value of the frequency of mechanical rupture of the membrane, in particular beyond the high audible frequencies;
  • limit the tilting effects of the membrane;
  • to make a more compact speaker.

Claims (6)

  1. 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) having a concentric annular fold (12) delimiting in the membrane (1), a circular central portion (13) and an annular peripheral portion (14);
    - the central portion (13) having a concavity turned towards the upper surface; and
    - the internal edge (120) of the fold (12) being carried by the lower surface (10) and comprising an attachment surface intended for the coupling of said support (3) of the coil
    characterized in that the tangent to the lower surface (10) of the central portion (13) at a point located on the edge of the fold (12) and the tangent to the lower surface (10) of the annular portion (14) at the same point, form an acute angle between them.
  2. The acoustic membrane according to claim 1, characterized in that the central portion (13) and the annular portion (14) are of different materials.
  3. The acoustic membrane according to one of claims 1 or 2, characterized in that:
    - The tangent to the lower surface of the central portion (13) at a point located on the edge of the fold (12) and a main axis of symmetry (z) of the membrane (1) form a first acute angle (α1); and
    - The tangent to the lower surface of the annular portion (14) at the same point and the main axis of symmetry (z) form a second acute angle (α2).
  4. The acoustic membrane according to one of claims 1 to 3, characterized in that the ratio of the surface areas of the central portion (13) and the annular portion (14) is between 0.8 and 1.6.
  5. The acoustic membrane according to one of claims 1 or 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. A loudspeaker comprising:
    - a fixed chassis (2);
    - a magnetic circuit (5) attached to the chassis (2);
    - an assembly mobile relative to the chassis (2) comprising:
    • the acoustic membrane (1) according to one of claims 1 to 6, with concavity turned towards the outside of the loudspeaker;
    • a moving coil (4);
    • a cylindrical support (3) bearing said coil (4) and secured to the internal 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)

Application Number Priority Date Filing Date Title
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

Publications (2)

Publication Number Publication Date
EP3391664A1 EP3391664A1 (en) 2018-10-24
EP3391664B1 true EP3391664B1 (en) 2020-01-15

Family

ID=55236768

Family Applications (1)

Application Number Title Priority Date Filing Date
EP16812982.3A Active EP3391664B1 (en) 2015-12-14 2016-11-15 Acoustic membrane for a loudspeaker and corresponding loudspeaker

Country Status (5)

Country Link
US (1) US10820111B2 (en)
EP (1) EP3391664B1 (en)
CN (1) CN108370473B (en)
FR (1) FR3045264B1 (en)
WO (1) WO2017103360A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
TWM592200U (en) * 2019-11-01 2020-03-11 英屬開曼群島商康而富控股股份有限公司 Diaphragm structure for miniature speaker

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040170297A1 (en) * 2003-02-27 2004-09-02 Pioneer Corporation Speaker apparatus

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4590332A (en) * 1983-05-23 1986-05-20 Pascal Delbuck Phase coherent low frequency speaker
US6490363B1 (en) * 1999-10-13 2002-12-03 Chun-I Liu Structure of speaker
DE10303030A1 (en) * 2003-01-25 2004-08-05 Norman Gerkinsmeyer driver
FR2854021B1 (en) 2003-04-16 2006-03-31 Focal Jmlab ACOUSTIC TRANSDUCER IN DIRECT RADIATION DIRECT RADIATION BERYLLIUM ACRYLIC, FOR CONCAVE-SHAPED MEMBRANE, FOR AUDIO APPLICATIONS ESPECIALLY FOR ACOUSTIC SPEAKERS
KR101139098B1 (en) * 2003-08-08 2012-04-30 피에스에스 벨기에 엔브이 Loudspeaker with undulated membrane
CN102761799A (en) * 2011-04-27 2012-10-31 鸿富锦精密工业（深圳）有限公司 Earphone
US10694279B1 (en) * 2018-12-21 2020-06-23 Alpine Electronics, Inc. Compact coaxial loudspeaker

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040170297A1 (en) * 2003-02-27 2004-09-02 Pioneer Corporation Speaker apparatus

Also Published As

Publication number Publication date
WO2017103360A1 (en) 2017-06-22
US20200053474A1 (en) 2020-02-13
FR3045264B1 (en) 2019-01-25
CN108370473B (en) 2020-07-31
FR3045264A1 (en) 2017-06-16
CN108370473A (en) 2018-08-03
US10820111B2 (en) 2020-10-27
EP3391664A1 (en) 2018-10-24

Similar Documents

Publication Publication Date Title
EP2577992B1 (en) Acoustic loudspeaker
EP2526705B1 (en) Electrodynamic speaker structure having mems technology
EP1943876B1 (en) Electrodynamic transducer including a dome with a ferrofluid suspension
EP3391664B1 (en) Acoustic membrane for a loudspeaker and corresponding loudspeaker
US20170085979A1 (en) Electroacoustic Transducer
EP3879850A1 (en) Loudspeaker comprising a rigid membrane connected to at least two coils
EP2524521B1 (en) Dome-shaped electrodynamic transducer having a floating suspension
EP3469812B1 (en) Electrodynamic broad band transducer for audio headphone and respective audio headphone
EP4075422A1 (en) Micrometric loudspeaker
EP1665870A2 (en) Sound-reproducing transducer
FR3009662A3 (en) SPEAKER WITH MAGNET MOUNTED AHEAD
EP2700247B1 (en) Device for emitting an acoustic wave
EP2881806A1 (en) Acoustic dispersion membrane for a musical watch
WO2018229242A1 (en) Loudspeaker
FR3090206A1 (en) Electromechanical actuator, vibrotactile button and surface loudspeaker comprising such an electromechanical actuator
WO2021111010A1 (en) High excursion, low distortion and low depth speaker
FR3104366A1 (en) LARGE EXCURSION, LOW DISTORTION AND LOW DEPTH LOUDSPEAKER
FR3128602A1 (en) Loudspeaker comprising a magnetic motor, a central part of which forms at least one groove in the air gap
FR3125910A1 (en) Loudspeaker comprising a membrane mounted reversibly, and acoustic enclosure incorporating such a loudspeaker
EP3637795A1 (en) Electrodynamic loudspeaker comprising a lattice
FR3024630A1 (en) COMPACT SPEAKER INCLUDING A MEMBRANE COMPRISING RADIAL PLATES
WO2018220028A1 (en) Electrodynamic loudspeaker with at least two seals defining an intermediate cavity filled with air
FR3058022A1 (en) SPEAKER COMPRISING A PARTICULAR MEMBRANE AND METHOD FOR ASSEMBLING A LOUDSPEAKER
FR2709223A1 (en) Wideband loudspeaker
BE621159A (en)

Legal Events

Date Code Title Description
STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: UNKNOWN

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE INTERNATIONAL PUBLICATION HAS BEEN MADE

PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: REQUEST FOR EXAMINATION WAS MADE

17P Request for examination filed

Effective date: 20180615

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

AX Request for extension of the european patent

Extension state: BA ME

RIN1 Information on inventor provided before grant (corrected)

Inventor name: NICOLETTI, GIULIANO

DAV Request for validation of the european patent (deleted)
DAX Request for extension of the european patent (deleted)
GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: GRANT OF PATENT IS INTENDED

INTG Intention to grant announced

Effective date: 20190415

GRAS Grant fee paid

Free format text: ORIGINAL CODE: EPIDOSNIGR3

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE PATENT HAS BEEN GRANTED

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

REG Reference to a national code

Ref country code: CH

Ref legal event code: EP

Ref country code: GB

Ref legal event code: FG4D

Free format text: NOT ENGLISH

REG Reference to a national code

Ref country code: IE

Ref legal event code: FG4D

Free format text: LANGUAGE OF EP DOCUMENT: FRENCH

REG Reference to a national code

Ref country code: DE

Ref legal event code: R096

Ref document number: 602016028435

Country of ref document: DE

REG Reference to a national code

Ref country code: AT

Ref legal event code: REF

Ref document number: 1226217

Country of ref document: AT

Kind code of ref document: T

Effective date: 20200215

REG Reference to a national code

Ref country code: NL

Ref legal event code: MP

Effective date: 20200115

REG Reference to a national code

Ref country code: LT

Ref legal event code: MG4D

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: NL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20200115

Ref country code: RS

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20200115

Ref country code: FI

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20200115

Ref country code: NO

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20200415

Ref country code: PT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20200607

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: BG

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20200415

Ref country code: GR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20200416

Ref country code: IS

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20200515

Ref country code: SE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20200115

Ref country code: LV

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20200115

Ref country code: HR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20200115

REG Reference to a national code

Ref country code: DE

Ref legal event code: R097

Ref document number: 602016028435

Country of ref document: DE

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SM

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20200115

Ref country code: EE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20200115

Ref country code: DK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20200115

Ref country code: SK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20200115

Ref country code: RO

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20200115

Ref country code: ES

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20200115

Ref country code: CZ

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20200115

Ref country code: LT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20200115

REG Reference to a national code

Ref country code: AT

Ref legal event code: MK05

Ref document number: 1226217

Country of ref document: AT

Kind code of ref document: T

Effective date: 20200115

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed

Effective date: 20201016

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: AT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20200115

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SI

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20200115

Ref country code: PL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20200115

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: MC

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20200115

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LU

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20201115

REG Reference to a national code

Ref country code: BE

Ref legal event code: MM

Effective date: 20201130

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LI

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20201130

Ref country code: CH

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20201130

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20201115

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: TR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20200115

Ref country code: MT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20200115

Ref country code: CY

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20200115

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: MK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20200115

Ref country code: AL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20200115

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: BE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20201130

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 20231120

Year of fee payment: 8

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: IT

Payment date: 20231110

Year of fee payment: 8

Ref country code: FR

Payment date: 20231130

Year of fee payment: 8

Ref country code: DE

Payment date: 20231107

Year of fee payment: 8