EP3284269B1 - Manufacturing method of a suspension device for a loudspeaker - Google Patents

Manufacturing method of a suspension device for a loudspeaker Download PDF

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Publication number
EP3284269B1
EP3284269B1 EP16717319.4A EP16717319A EP3284269B1 EP 3284269 B1 EP3284269 B1 EP 3284269B1 EP 16717319 A EP16717319 A EP 16717319A EP 3284269 B1 EP3284269 B1 EP 3284269B1
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EP
European Patent Office
Prior art keywords
suspension
hoop
suspension device
protuberance
stable state
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EP16717319.4A
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German (de)
French (fr)
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EP3284269A1 (en
Inventor
Giuliano NICOLETTI
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Focal JMLab SAS
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Focal JMLab SAS
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R7/00—Diaphragms for electromechanical transducers; Cones
    • H04R7/16—Mounting or tensioning of diaphragms or cones
    • H04R7/18—Mounting or tensioning of diaphragms or cones at the periphery
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R31/00—Apparatus or processes specially adapted for the manufacture of transducers or diaphragms therefor
    • H04R31/003—Apparatus or processes specially adapted for the manufacture of transducers or diaphragms therefor for diaphragms or their outer suspension
    • 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
    • H04R7/26—Damping by means acting directly on free portion of diaphragm or cone
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2307/00—Details of diaphragms or cones for electromechanical transducers, their suspension or their manufacture covered by H04R7/00 or H04R31/003, not provided for in any of its subgroups
    • H04R2307/201—Damping aspects of the outer suspension of loudspeaker diaphragms by addition of additional damping means
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2307/00—Details of diaphragms or cones for electromechanical transducers, their suspension or their manufacture covered by H04R7/00 or H04R31/003, not provided for in any of its subgroups
    • H04R2307/207—Shape aspects of the outer suspension of loudspeaker diaphragms
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2400/00—Loudspeakers
    • H04R2400/11—Aspects regarding the frame of loudspeaker transducers

Definitions

  • the invention relates to the field of acoustic equipment. It relates to a method of manufacturing a suspension device for a loudspeaker, and more specifically to a suspension device connecting a chassis of a loudspeaker with a membrane. The invention more specifically relates to the manufacture of a suspension device which has advantages in terms of acoustic performance, especially with regard to the regularity of the frequency response curve.
  • a loudspeaker comprises a fixed frame and a circular mobile membrane mechanically associated with a coil traversed by a current representative of the acoustic signal to be generated.
  • the loudspeaker also comprises a magnetic field source, generally constant, which interacts with the current flowing through the winding to allow movement of the winding and therefore of the membrane.
  • an annular suspension device comprising an annular outer edge adapted to fix the suspension device on the frame and an annular inner edge adapted to fix the suspension device with the circular membrane.
  • the suspension device comprises a suspension arc intended to absorb displacement stresses produced on the inner edge.
  • the deformations of the suspension arc create oscillations around the position of the suspension arc when it is not in an absorption situation. These oscillations can resonate and form a resonance mode degrading the quality of the acoustic wave emitted by the speaker.
  • the US patent US 7,463,749 proposes to position three hemi-toric excrescences under the arch of suspension in order to increase its rigidity and to limit its deformations.
  • the US patent application US 2002/051558 also proposes positioning hemi-toric excrescences in the center of the arc of suspension.
  • the patent application GB 2,471,884 proposes a method of manufacturing a suspension device.
  • the rigidity of the suspension arc conditions the dynamics of the loudspeaker, that is to say the time required for the speaker diaphragm to move when a setpoint is applied thereto.
  • the membrane is free in the air and when a displacement instruction is applied to the membrane, it can respond directly by moving.
  • the suspension device has the primary function of guiding the displacement of the membrane in translation, but it constitutes a brake on the movement of the membrane because it must overcome the rigidity of the suspension arc to effect a displacement following a command . So, the solution of the American patent US 7,463,749 and the US patent application US 2002/051558 limiting the deformations of the suspension arc is not optimal because it greatly degrades the dynamics of the loudspeaker.
  • the patent application US 2003/0228027 proposes to position one or two partially O-shaped protrusions on the suspension arch to limit its deformations. He also proposes to limit the stiffness of the suspension arc by means of a circular profile of the crenellated growths. The profile of the crenellated growths limits the weight of the suspension arc and has recesses whose length is determined by empirical tests.
  • the technical problem of the invention is therefore to effectively absorb the resonance modes of a speaker suspension device without negatively impacting the performance of the suspension device.
  • the present invention aims at providing a method of manufacturing a more easily implementable device comprising a suspension bow capable of effectively absorbing oscillations and whose weight is controlled by means of at least one protrusion whose position is determined according to the position of the resonance mode.
  • the application relates to a suspension device for loudspeaker, this device comprising an annular outer edge adapted to fix the suspension device with a frame, an annular inner edge adapted to fix the suspension device with a membrane, and a suspension arc extending annularly between the outer and inner edges.
  • This suspension arc is able to absorb displacement stresses produced at the inner edge by means of a deformation of the suspension arc thus forming at least one resonance mode.
  • This suspension arc comprises at least one annular protrusion positioned so as to minimize the at least one resonant mode of the suspension arc, the mass of each of this annular protrusion being between 150% and 400% of the mass of d a part of the suspension arc on which the annular protuberance is positioned.
  • This device thus makes it possible to quickly and accurately define the position of the excrescences capable of significantly reducing the resonances.
  • the controlled weight of the growths limits the impact of these excrescences on the dynamics of the speaker.
  • An annular protrusion positioned so as to minimize the at least one mode of resonance of the arc of suspension corresponds to an outgrowth of which a positioning study has been carried out when the suspension arc is not provided with the protrusion of so as to locate at least one mode of resonance of the arc of suspension.
  • This excrescence is therefore different from the growths of the US patent application US 2002/005158 which are simply positioned in the middle of the suspension arc without taking into consideration at least one resonance mode of the suspension arc.
  • this annular protrusion forms a regular material thickness of circular radial section.
  • This form of outgrowth is particularly simple to control in terms of weight.
  • adjustments in loudspeaker dynamics can be made by changing the radius of the circular radial section of the protrusion.
  • the mass of the at least one annular protrusion corresponds to approximately 250% of the mass of a portion of the suspension arc on which the at least one annular protrusion is positioned. This value makes it possible to obtain a particularly suitable compromise between the dynamics of the loudspeaker and the need to reduce the resonances of the suspension arc.
  • the device comprises one, two or three annular excrescences.
  • This manufacturing method makes it possible to determine the position of the excrescences capable of significantly reducing the oscillations by means of a single numerical analysis of the displacements of the suspension arc.
  • the position of the local maximum relative to the stable state of the suspension arc makes it possible to highlight both the hollows and the bumps resulting from the deformations of the suspension arc.
  • This embodiment makes it possible to eliminate the double positions detected using an averaging whose accuracy of 20% is particularly suitable.
  • the step of exciting the inner edge of the suspension device is performed with a characteristic signal whose frequencies evolve in a predetermined frequency range, preferably between 100 Hz and 10 KHz. It is well known that very high-end suspension devices are made to be effective over a characteristic frequency range. This embodiment makes it possible to manufacture a suspension device that is particularly suited to its characteristic frequency range.
  • This embodiment makes it possible to numerically define the size of the protuberance thus improving the resonance reduction performance and limiting the impact of the weight of the protrusion on the suspension arc.
  • This embodiment makes it possible to position a second protrusion in order to further limit the resonant modes of the suspension device. As a variant, these steps may be repeated to add a third protrusion if the limitation of the resonance modes is still not sufficient.
  • the application relates to a loudspeaker comprising a frame, a diaphragm displaceable in translation, and a suspension device as described above.
  • the Figures 1 to 8 describe the method of producing the suspension device according to the invention.
  • a suspension device 10 to be improved is observed for a stable state.
  • the suspension device 10 has a fixed outer annular edge 12 and an annular inner edge 14 fixed to a translational membrane 15 .
  • a suspension arc 16 annularly connects the two edges 12, 14.
  • the membrane 15 is then moved to measure the induced displacements of the suspension arc 16 during a duration of characterization.
  • the membrane 15 is moved on frequencies contained in a frequency range associated with the suspension device.
  • the membrane the excitation signal 15 corresponds to a sinusoidal signal whose amplitude is constant and whose frequency is variable between a low frequency and a high frequency in the frequency range, for example in the frequency range 100Hz to 10KHz.
  • the Figures 2 to 4 reveal the resonances induced on the suspension arc 16 by the displacements of the membrane 15.
  • the resonances of the suspension arc 16 during the characterization period are digitally sensed by a sampling and each sample is analyzed in order to detect local maxima 17.
  • the measurements are preferably carried out by an interferometry system.
  • the suspension device 10 is placed on a dedicated support, and a laser is positioned on a support movable along three axes so as to scan the entire emitting surface of the suspension device 10.
  • the laser makes it possible to measure the displacements of the suspension device 10 during the duration of characterization. This measure provides measuring the sound pressure and harmonic distortion curves of the suspension device 10 during the characterization period.
  • the Figures 2 to 4 represent three of these samples with reference to the suspension device 16 of the figure 1 .
  • the local maxima correspond to the peaks of the bumps and valleys formed by the suspension arc 16 over time.
  • the first maxima 17 and its projection on the suspension arc 16 in the stable state is measured, that is to say the maxima 17 closest to the annular inner edge 14 adapted to fix the suspension device 10 with a membrane 15.
  • the characteristic "positioned so as to minimize the at least one resonance mode” is thus interpreted in this document as being positioned on the suspension arc 16 on the first local maximum 17.
  • the Figure 5 reveals that the detected positions 18 are grouped according to sets 19 whose distance is less than 20% of the total distance of the suspension arc 16 in the stable state.
  • the position of each protrusion 20 is then an average position 21 between the positions 18 of each set 19.
  • the Figure 6 reveals three average positions 21 detected during an analysis example corresponding to the Figures 1 to 8 .
  • a protrusion 20 is thus positioned on the suspension arch 16 at the average position 21.
  • the frequency response of the suspension device 10 can thus be newly studied and if the response is not satisfactory, that is to say that is, the improved suspension arc 16 still has detrimental resonance modes, a new protrusion 20 can be added.
  • the Figure 7 illustrates an improved suspension arch 16 according to a first embodiment of the invention by three protuberances 20 whose position corresponds to the average positions 21 detected during three consecutive improvements of the suspension device 10.
  • the annular protrusions 20 consist of a regular material thickness of circular radial section.
  • the Figure 8 illustrates that the size of annular protuberances 20 is controlled so that the mass (or a homogeneous material, the volume) of each protuberance 20 is between 150% and 400% of the mass of a portion of the arc of suspension 16 on which the at least one annular projection 20 is positioned.
  • the volume 25 of the protuberance 20 is between 150% and 400% of the volume 24 of the part of the arc of suspension 16 on which is located the protuberance 20.
  • the volume 25 of the protrusion 20 corresponds to 250% of the volume 24 of the portion of the arc 16 of suspension.
  • the weight of each protrusion 20 can be defined numerically using a numerical model of the suspension device 10.
  • the dynamics of the suspension device 10 is then modeled numerically as a function of the measurements of the displacements of the arc. suspension 16.
  • the size of the protrusion 20 is sought by numerical simulation of the previously defined model so as to minimize the resonance modes and limit the impact of the weight of the protrusion 20.
  • the size of the protrusion 20 is changed between two numerical simulations to travel the mass ratio from 150% to 400% with a predefined calculation step, about 10%. For each simulation, the response is observed in order to calculate the amplitude of the oscillations of the suspension device 10 and the rigidity of the annular inner edge 14 .
  • the amplitude of the oscillations of the suspension device 10 makes it possible to estimate numerically the resonance modes, it is therefore necessary that this amplitude be minimal.
  • the rigidity of the annular inner edge 14 makes it possible to estimate numerically the impact of the weight of the protrusion 20, this rigidity must also be minimal.
  • the weight of each outgrowth 20 can be defined as a function of the maximum distance of the local maximum 17 with the stable state of the suspension arc 16 during the duration of the characterization while remaining in the ratio of mass 150% to 400%.
  • the Figures 9, 10 and 11 disclose three different embodiments in which the stresses applied to the suspension device are different. As a result, the number of excrescences differs, namely two for Figures 9 and 10 and only one for the Figure 11 and that the position of protrusions 20 also differ between Figures 9 to 11 .
  • the invention thus makes it possible to suppress only the oscillations of the suspension arc 16 which are identified as detrimental to the listening quality. However, it aims not to reduce all oscillations because it would lead to a reduction of the loudspeaker dynamic too important.
  • the weight of the excrescences 20 is controlled to limit the degradation induced on the dynamics of a speaker.
  • the invention thus makes it possible to propose a method of manufacturing a loudspeaker whose acoustic performance is increased by means of the proposed suspension device.

Description

DOMAINE TECHNIQUETECHNICAL AREA

L'invention se rattache au domaine du matériel acoustique. Elle concerne un procédé de fabrication d'un dispositif de suspension pour haut-parleur, et plus précisément à un dispositif de suspension reliant un châssis d'un haut-parleur avec une membrane. L'invention vise plus spécifiquement la fabrication d'un dispositif de suspension qui présente des avantages en termes de performances acoustiques, notamment en ce qui concerne la régularité de la courbe de réponse en fréquence.The invention relates to the field of acoustic equipment. It relates to a method of manufacturing a suspension device for a loudspeaker, and more specifically to a suspension device connecting a chassis of a loudspeaker with a membrane. The invention more specifically relates to the manufacture of a suspension device which has advantages in terms of acoustic performance, especially with regard to the regularity of the frequency response curve.

ART ANTERIEURPRIOR ART

De façon générale, un haut-parleur comprend un châssis fixe et une membrane mobile circulaire associée mécaniquement à un bobinage parcouru par un courant représentatif du signal acoustique à générer. Le haut-parleur comprend également une source de champ magnétique, généralement constant, qui interagit avec le courant parcourant le bobinage pour permettre le déplacement du bobinage et donc de la membrane.In general, a loudspeaker comprises a fixed frame and a circular mobile membrane mechanically associated with a coil traversed by a current representative of the acoustic signal to be generated. The loudspeaker also comprises a magnetic field source, generally constant, which interacts with the current flowing through the winding to allow movement of the winding and therefore of the membrane.

Les déplacements de la membrane circulaire par rapport au châssis sont guidés par un dispositif de suspension annulaire comportant un bord extérieur annulaire apte à fixer le dispositif de suspension sur le châssis et un bord intérieur annulaire apte à fixer le dispositif de suspension avec la membrane circulaire. Entre ces deux bords annulaires, le dispositif de suspension comporte un arc de suspension destinée à absorber des contraintes de déplacement produites sur le bord intérieur.The movements of the circular membrane relative to the frame are guided by an annular suspension device comprising an annular outer edge adapted to fix the suspension device on the frame and an annular inner edge adapted to fix the suspension device with the circular membrane. Between these two annular edges, the suspension device comprises a suspension arc intended to absorb displacement stresses produced on the inner edge.

Cependant, lors de l'absorption des contraintes de déplacement, les déformations de l'arc de suspension créent des oscillations autour de la position de l'arc de suspension lorsqu'il n'est pas en situation d'absorption. Ces oscillations peuvent résonner et former un mode de résonnance dégradant la qualité de l'onde acoustique émise par le haut-parleur.However, during the absorption of the displacement stresses, the deformations of the suspension arc create oscillations around the position of the suspension arc when it is not in an absorption situation. These oscillations can resonate and form a resonance mode degrading the quality of the acoustic wave emitted by the speaker.

Pour éliminer ces modes de résonnance, il est connu d'augmenter la rigidité de l'arc de suspension. Le brevet américain US 7,463,749 propose de positionner trois excroissances hémi-toriques sous l'arc de suspension afin d'augmenter sa rigidité et de limiter ses déformations. La demande de brevet américain US 2002/051558 propose également des positionner des excroissances hémi-toriques au centre de l'arc de suspension. La demande de brevet GB 2 471 884 propose un procédé de fabrication d'un dispositif de suspension.To eliminate these modes of resonance, it is known to increase the rigidity of the suspension arc. The US patent US 7,463,749 proposes to position three hemi-toric excrescences under the arch of suspension in order to increase its rigidity and to limit its deformations. The US patent application US 2002/051558 also proposes positioning hemi-toric excrescences in the center of the arc of suspension. The patent application GB 2,471,884 proposes a method of manufacturing a suspension device.

Cependant, la rigidité de l'arc de suspension conditionne la dynamique du haut-parleur, c'est-à-dire le temps nécessaire à la membrane du haut-parleur pour effectuer un déplacement lorsqu'une consigne lui est appliquée. Pour un haut-parleur idéal, la membrane est libre dans l'air et lorsqu'une consigne de déplacement est appliquée à la membrane, elle peut répondre directement en effectuant un déplacement. Le dispositif de suspension a pour première fonction de guider les déplacements de la membrane en translation, mais il constitue un frein au déplacement de la membrane car celle-ci doit vaincre la rigidité de l'arc de suspension pour effectuer un déplacement consécutif à une commande. Ainsi, la solution du brevet américain US 7,463,749 et de la demande de brevet américain US 2002/051558 consistant à limiter les déformations de l'arc de suspension n'est pas optimale car elle dégrade fortement la dynamique du haut-parleur.However, the rigidity of the suspension arc conditions the dynamics of the loudspeaker, that is to say the time required for the speaker diaphragm to move when a setpoint is applied thereto. For an ideal loudspeaker, the membrane is free in the air and when a displacement instruction is applied to the membrane, it can respond directly by moving. The suspension device has the primary function of guiding the displacement of the membrane in translation, but it constitutes a brake on the movement of the membrane because it must overcome the rigidity of the suspension arc to effect a displacement following a command . So, the solution of the American patent US 7,463,749 and the US patent application US 2002/051558 limiting the deformations of the suspension arc is not optimal because it greatly degrades the dynamics of the loudspeaker.

La demande de brevet US 2003/0228027 propose de positionner une ou deux excroissances partiellement toriques sur l'arc de suspension pour limiter ses déformations. Il propose également de limiter la rigidité de l'arc de suspension à l'aide d'un profil circulaire des excroissances en forme de créneaux. Le profil des excroissances en forme de créneau limite le poids de l'arc de suspension et comporte des évidements dont la longueur est déterminée par des essaies empiriques.The patent application US 2003/0228027 proposes to position one or two partially O-shaped protrusions on the suspension arch to limit its deformations. He also proposes to limit the stiffness of the suspension arc by means of a circular profile of the crenellated growths. The profile of the crenellated growths limits the weight of the suspension arc and has recesses whose length is determined by empirical tests.

Cependant, relever et tracer la courbe de réponse d'un haut-parleur est une opération complexe, souvent longue et faisant appel à des équipements rares tels qu'une chambre anéchoïque. La définition empirique de la forme des créneaux associés à chaque gamme de haut-parleur constitue donc une opération particulièrement longue.However, picking up and plotting the response curve of a loudspeaker is a complex operation, often a long one, using rare equipment such as an anechoic chamber. The empirical definition of the shape of the slots associated with each range of loudspeakers therefore constitutes a particularly long operation.

En outre, les excroissances de la demande de brevet US 2003/0228027 ne suivent pas la forme circulaire de l'arc de suspension. Les résonnances annulaires induites par la forme de créneau doivent donc être amorties pour ne pas dégrader les performances du haut-parleurs limitant ainsi l'efficacité de ce dispositif.In addition, the growths of the patent application US 2003/0228027 do not follow the circular shape of the suspension bow. The annular resonances induced by the slot shape must therefore be damped so as not to degrade the performance of the loudspeakers thus limiting the effectiveness of this device.

Le problème technique de l'invention est donc d'absorber efficacement les modes de résonance d'un dispositif de suspension pour haut-parleur sans impacter négativement les performances du dispositif de suspension.The technical problem of the invention is therefore to effectively absorb the resonance modes of a speaker suspension device without negatively impacting the performance of the suspension device.

EXPOSE DE L'INVENTIONSUMMARY OF THE INVENTION

La présente invention vise à proposer un procédé de fabrication d'un dispositif plus facilement réalisable comportant un arc de suspension capable d'absorber efficacement les oscillations et dont le poids est maîtrisé au moyen d'au moins une excroissance dont la position est déterminée selon la position du mode de résonnance.The present invention aims at providing a method of manufacturing a more easily implementable device comprising a suspension bow capable of effectively absorbing oscillations and whose weight is controlled by means of at least one protrusion whose position is determined according to the position of the resonance mode.

Selon un premier aspect qui ne constitue pas l'invention, la demande concerne un dispositif de suspension pour haut-parleur, ce dispositif comportant un bord extérieur annulaire apte à fixer le dispositif de suspension avec un châssis, un bord intérieur annulaire apte à fixer le dispositif de suspension avec une membrane, et un arc de suspension s'étendant annulairement entre les bords extérieur et intérieur. Cet arc de suspension est apte à absorber des contraintes de déplacement produites au niveau du bord intérieur au moyen d'une déformation de l'arc de suspension formant ainsi au moins un mode de résonnance. Cet arc de suspension comporte au moins une excroissance annulaire positionnée de sorte à minimiser l'au moins un mode de résonnance de l'arc de suspension, la masse de chacune de cette excroissance annulaire étant comprise entre 150% et 400% de la masse d'une partie de l'arc de suspension sur laquelle l'excroissance annulaire est positionnée.According to a first aspect which does not constitute the invention, the application relates to a suspension device for loudspeaker, this device comprising an annular outer edge adapted to fix the suspension device with a frame, an annular inner edge adapted to fix the suspension device with a membrane, and a suspension arc extending annularly between the outer and inner edges. This suspension arc is able to absorb displacement stresses produced at the inner edge by means of a deformation of the suspension arc thus forming at least one resonance mode. This suspension arc comprises at least one annular protrusion positioned so as to minimize the at least one resonant mode of the suspension arc, the mass of each of this annular protrusion being between 150% and 400% of the mass of d a part of the suspension arc on which the annular protuberance is positioned.

Ce dispositif permet ainsi de définir rapidement et précisément la position des excroissances aptes à réduire significativement les résonnances. En outre, le poids maitrisé des excroissances limite l'impact de ces excroissances sur la dynamique du haut-parleur.This device thus makes it possible to quickly and accurately define the position of the excrescences capable of significantly reducing the resonances. In addition, the controlled weight of the growths limits the impact of these excrescences on the dynamics of the speaker.

Une excroissance annulaire positionnée de sorte à minimiser l'au moins un mode de résonnance de l'arc de suspension correspond à une excroissance dont une étude de positionnement a été effectuée lorsque l'arc de suspension n'est pas pourvue de l'excroissance de sorte à localiser au moins un mode de résonnance de l'arc de suspension. Cette excroissance se distingue donc des excroissances de la demande de brevet américain US 2002/005158 qui sont simplement positionnées au milieu de l'arc de suspension sans prise en considération d'au moins un mode de résonance de l'arc de suspension.An annular protrusion positioned so as to minimize the at least one mode of resonance of the arc of suspension corresponds to an outgrowth of which a positioning study has been carried out when the suspension arc is not provided with the protrusion of so as to locate at least one mode of resonance of the arc of suspension. This excrescence is therefore different from the growths of the US patent application US 2002/005158 which are simply positioned in the middle of the suspension arc without taking into consideration at least one resonance mode of the suspension arc.

Selon un mode de réalisation, cette excroissance annulaire forme une épaisseur de matière régulière de section radiale circulaire. Cette forme d'excroissance est particulièrement simple à maîtriser en termes de poids. En outre, des ajustements de la dynamique du haut-parleur peuvent être effectués en modifiant le rayon de la section radiale circulaire de l'excroissance.According to one embodiment, this annular protrusion forms a regular material thickness of circular radial section. This form of outgrowth is particularly simple to control in terms of weight. In addition, adjustments in loudspeaker dynamics can be made by changing the radius of the circular radial section of the protrusion.

Selon un mode de réalisation, la masse de l'au moins une excroissance annulaire correspond à environ 250% de la masse d'une partie de l'arc de suspension sur laquelle l'au moins une excroissance annulaire est positionnée. Cette valeur permet d'obtenir un compromis particulièrement adapté entre la dynamique du haut-parleur et le besoin de réduire les résonnances de l'arc de suspension.According to one embodiment, the mass of the at least one annular protrusion corresponds to approximately 250% of the mass of a portion of the suspension arc on which the at least one annular protrusion is positioned. This value makes it possible to obtain a particularly suitable compromise between the dynamics of the loudspeaker and the need to reduce the resonances of the suspension arc.

Selon un mode de réalisation, le dispositif comporte une, deux ou trois excroissances annulaires.According to one embodiment, the device comprises one, two or three annular excrescences.

Selon un second aspect, l'invention concerne un procédé de fabrication d'un dispositif de suspension pour haut-parleur tel que décrit précédemment comportant les étapes consistant à :

  • exciter le bord intérieur du dispositif de suspension,
  • mesurer, au cours d'une durée de caractérisation, les déplacements de l'arc de suspension par rapport à un état stable de l'arc de suspension,
  • détecter la position du premier maximum local des déplacements de l'arc de suspension par rapport à l'état stable de l'arc de suspension, et
  • définir une position d'une excroissance correspondant à une projection du premier maximum local sur l'arc de suspension à l'état stable.
According to a second aspect, the invention relates to a method of manufacturing a speaker suspension device as described above comprising the steps of:
  • excite the inner edge of the suspension device,
  • measure, during a duration of characterization, the displacements of the arc of suspension compared to a stable state of the arc of suspension,
  • detecting the position of the first local maximum of displacements of the suspension arc relative to the stable state of the suspension arc, and
  • defining a position of an outgrowth corresponding to a projection of the first local maximum on the suspension arc in the stable state.

Ce procédé de fabrication permet de déterminer la position des excroissances aptes à réduire significativement les oscillations au moyen d'une seule analyse numérique des déplacements de l'arc de suspension. La position du maximum local par rapport à l'état stable de l'arc de suspension permet de mettre en évidence à la fois les creux et les bosses résultants des déformations de l'arc de suspension.This manufacturing method makes it possible to determine the position of the excrescences capable of significantly reducing the oscillations by means of a single numerical analysis of the displacements of the suspension arc. The position of the local maximum relative to the stable state of the suspension arc makes it possible to highlight both the hollows and the bumps resulting from the deformations of the suspension arc.

Selon un mode de réalisation, l'étape consistant à définir une position d'une excroissance comprend les étapes consistant à :

  • définir au moins un ensemble de positions dont la distance entre les positions est inférieure à 20% de la distance totale de l'arc de suspension à l'état stable, et
  • déterminer une position moyenne de l'au moins un ensemble de positions correspondant à la position de l'excroissance.
According to one embodiment, the step of defining a position of an outgrowth comprises the steps of:
  • defining at least one set of positions whose distance between positions is less than 20% of the total distance of the steady-state suspension arc, and
  • determining an average position of the at least one set of positions corresponding to the position of the outgrowth.

Ce mode de réalisation permet d'éliminer les doubles positions détectées à l'aide d'un moyennage dont la précision de 20% est particulièrement adaptée.This embodiment makes it possible to eliminate the double positions detected using an averaging whose accuracy of 20% is particularly suitable.

Selon un mode de réalisation, l'étape consistant à exciter le bord intérieur du dispositif de suspension est effectuée avec un signal caractéristique dont les fréquences évoluent dans une plage de fréquence prédéterminée, de préférence entre 100Hz et 10 KHz. Il est bien connu que les dispositifs de suspension de très haut de gamme sont réalisés pour être efficaces sur une plage de fréquence caractéristique. Ce mode de réalisation permet de fabriquer un dispositif de suspension particulièrement adapté à sa plage de fréquence caractéristique.According to one embodiment, the step of exciting the inner edge of the suspension device is performed with a characteristic signal whose frequencies evolve in a predetermined frequency range, preferably between 100 Hz and 10 KHz. It is well known that very high-end suspension devices are made to be effective over a characteristic frequency range. This embodiment makes it possible to manufacture a suspension device that is particularly suited to its characteristic frequency range.

Selon un mode de réalisation, le procédé comporte les étapes consistant à :

  • modéliser numériquement la dynamique du dispositif de suspension en fonction des mesures, au cours de la durée de caractérisation, des déplacements de l'arc de suspension par rapport à un état stable de l'arc de suspension, et
  • définir la taille de l'excroissance par simulation numérique du modèle préalablement défini de sorte à minimiser les modes de résonnance et limiter l'impact du poids de l'excroissance.
According to one embodiment, the method comprises the steps of:
  • model numerically the dynamics of the suspension device as a function of the measurements, during the duration of the characterization, of the displacements of the suspension arc with respect to a stable state of the suspension arc, and
  • define the size of the outgrowth by numerical simulation of the previously defined model so as to minimize the resonance modes and limit the impact of the weight of the outgrowth.

Ce mode de réalisation permet de définir numériquement la taille de l'excroissance améliorant ainsi les performances de réduction des résonnances et limitant l'impact du poids de l'excroissance sur l'arc de suspension.This embodiment makes it possible to numerically define the size of the protuberance thus improving the resonance reduction performance and limiting the impact of the weight of the protrusion on the suspension arc.

Selon un mode de réalisation, le procédé comporte les étapes suivantes :

  • exciter une seconde fois le bord intérieur du dispositif de suspension amélioré lorsqu'une excroissance annulaire a été positionnée sur le dispositif de suspension et que le dispositif de suspension présente encore des modes de résonnances préjudiciables,
  • mesurer, au cours d'une seconde durée de caractérisation, les déplacements de l'arc de suspension amélioré, c'est-à-dire muni de l'excroissance annulaire, par rapport à un état stable de l'arc de suspension amélioré,
  • détecter la position du second maximum local des déplacements de l'arc de suspension amélioré par rapport à l'état stable de l'arc de suspension amélioré, et
  • définir une position d'une seconde excroissance correspondant à une projection du second maximum local sur l'arc de suspension amélioré à l'état stable.
According to one embodiment, the method comprises the following steps:
  • exciter a second time the inner edge of the improved suspension device when an annular protrusion has been positioned on the suspension device and the suspension device still has detrimental modes of resonance,
  • measuring, during a second duration of characterization, the displacements of the improved suspension arc, that is to say provided with the annular protrusion, with respect to a stable state of the improved suspension arc,
  • detecting the position of the second local maximum of the displacements of the improved suspension arc relative to the stable state of the improved suspension arc, and
  • defining a position of a second protrusion corresponding to a projection of the second local maximum on the improved suspension arc at steady state.

Ce mode de réalisation permet de positionner une seconde excroissance afin de limiter encore les modes de résonances du dispositif de suspension. En variante, ces étapes peuvent être répétées pour ajouter une troisième excroissance si la limitation des modes de résonance n'est toujours pas suffisante.This embodiment makes it possible to position a second protrusion in order to further limit the resonant modes of the suspension device. As a variant, these steps may be repeated to add a third protrusion if the limitation of the resonance modes is still not sufficient.

Selon un troisième aspect qui ne constitue pas l'invention, la demande concerne un haut-parleur comprenant un châssis, une membrane déplaçable en translation, et un dispositif de suspension tel que décrit précédemment.According to a third aspect which does not constitute the invention, the application relates to a loudspeaker comprising a frame, a diaphragm displaceable in translation, and a suspension device as described above.

DESCRIPTION SOMMAIRE DES FIGURESSUMMARY DESCRIPTION OF THE FIGURES

La manière de réaliser l'invention ainsi que les avantages qui en découlent, ressortiront bien du mode de réalisation qui suit, donné à titre indicatif mais non limitatif, à l'appui des figures annexées dans lesquelles les figures 1 à 11 représentent :

  • Figure 1 : une vue en coupe radiale d'un dispositif de suspension dans un état stable ;
  • Figure 2 : une vue en coupe radiale du dispositif de suspension de la Figure 1 dans un premier état d'excitation ;
  • Figure 3 : une vue en coupe radiale du dispositif de suspension de la Figure 1 dans un deuxième état d'excitation ;
  • Figure 4 : une vue en coupe radiale du dispositif de suspension de la Figure 1 dans un troisième état d'excitation ;
  • Figure 5 : une vue en coupe radiale du dispositif de suspension de la Figure 1 dans une étape consistant à définir des ensembles de positions ;
  • Figure 6 : une vue en coupe radiale du dispositif de suspension de la Figure 1 dans une étape consistant à définir une position moyenne ;
  • Figure 7 : une vue en coupe radiale d'un dispositif de suspension muni de trois excroissances annulaires selon un premier mode de réalisation de l'invention ;
  • Figure 8 : un agrandissement d'une excroissance radiale de la Figure 7 ;
  • Figure 9 : une vue en coupe radiale et en perspective d'un dispositif de suspension muni de deux excroissances annulaires selon un second mode de réalisation de l'invention ;
  • Figure 10 : une vue en coupe radiale et en perspective d'un dispositif de suspension muni de deux excroissances annulaires selon un troisième mode de réalisation de l'invention ; et
  • Figure 11 : une vue en coupe radiale et en perspective d'un dispositif de suspension muni d'une seule excroissance annulaire selon un quatrième mode de réalisation de l'invention.
The manner of carrying out the invention as well as the advantages which result therefrom, will emerge clearly from the following embodiment, given by way of indication but not limitation, in support of the appended figures in which the Figures 1 to 11 represent:
  • Figure 1 : a radial sectional view of a suspension device in a stable state;
  • Figure 2 : a radial sectional view of the suspension device of the Figure 1 in a first state of excitation;
  • Figure 3 : a radial sectional view of the suspension device of the Figure 1 in a second state of excitation;
  • Figure 4 : a radial sectional view of the suspension device of the Figure 1 in a third state of excitation;
  • Figure 5 : a radial sectional view of the suspension device of the Figure 1 in a step of defining sets of positions;
  • Figure 6 : a radial sectional view of the suspension device of the Figure 1 in a step of defining an average position;
  • Figure 7 : a radial sectional view of a suspension device provided with three annular protuberances according to a first embodiment of the invention;
  • Figure 8 : an enlargement of a radial outgrowth of the Figure 7 ;
  • Figure 9 : a radial cross-sectional perspective view of a suspension device provided with two annular protrusions according to a second embodiment of the invention;
  • Figure 10 : A radial sectional perspective view of a suspension device provided with two annular protrusions according to a third embodiment of the invention; and
  • Figure 11 : A radial sectional perspective view of a suspension device provided with a single annular protrusion according to a fourth embodiment of the invention.

DESCRIPTION DETAILLEE DE L'INVENTIONDETAILED DESCRIPTION OF THE INVENTION

Les Figures 1 à 8 décrivent le procédé de réalisation du dispositif de suspension selon l'invention. Dans une première étape illustrée sur la Figure 1, un dispositif de suspension 10 à améliorer est observé pour un état stable. Le dispositif de suspension 10 comporte un bord extérieur 12 annulaire fixe et un bord intérieur 14 annulaire fixé sur une membrane 15 mobile en translation. Un arc de suspension 16 relie annulairement les deux bords 12, 14. La membrane 15 est ensuite déplacée pour mesurer les déplacements induits de l'arc de suspension 16 durant une durée de caractérisation. De préférence, la membrane 15 est déplacée sur des fréquences contenues dans une plage de fréquence associée au dispositif de suspension. De préférence, le signal d'excitation de la membrane 15 correspond à un signal sinusoïdal dont l'amplitude est constante et dont la fréquence est variable entre une fréquence basse et une fréquence haute dans la plage de fréquence, par exemple dans la plage de fréquences 100Hz à 10KHz.The Figures 1 to 8 describe the method of producing the suspension device according to the invention. In a first step illustrated on the Figure 1 , a suspension device 10 to be improved is observed for a stable state. The suspension device 10 has a fixed outer annular edge 12 and an annular inner edge 14 fixed to a translational membrane 15 . A suspension arc 16 annularly connects the two edges 12, 14. The membrane 15 is then moved to measure the induced displacements of the suspension arc 16 during a duration of characterization. Preferably, the membrane 15 is moved on frequencies contained in a frequency range associated with the suspension device. Preferably, the membrane the excitation signal 15 corresponds to a sinusoidal signal whose amplitude is constant and whose frequency is variable between a low frequency and a high frequency in the frequency range, for example in the frequency range 100Hz to 10KHz.

Les Figures 2 à 4 révèlent les résonnances induits sur l'arc de suspension 16 par les déplacements de la membrane 15. Les résonnances de l'arc de suspension 16 au cours de la durée de caractérisation sont captés numériquement par un échantillonnage et chaque échantillon est analysé afin de détecter des maxima locaux 17. The Figures 2 to 4 reveal the resonances induced on the suspension arc 16 by the displacements of the membrane 15. The resonances of the suspension arc 16 during the characterization period are digitally sensed by a sampling and each sample is analyzed in order to detect local maxima 17.

Les mesures sont préférentiellement effectuées par un système d'interférométrie. Le dispositif de suspension 10 est placé sur un support dédié, et un laser est positionné sur un support mobile sur trois axes de sorte à scanner tout la surface émissive du dispositif de suspension 10. Le laser permet de mesurer les déplacements du dispositif de suspension 10 au cours du la durée de caractérisation. Cette mesure permet d'obtenir la mesure des courbes de pression acoustique et de distorsion harmonique du dispositif de suspension 10 au cours du la durée de caractérisation.The measurements are preferably carried out by an interferometry system. The suspension device 10 is placed on a dedicated support, and a laser is positioned on a support movable along three axes so as to scan the entire emitting surface of the suspension device 10. The laser makes it possible to measure the displacements of the suspension device 10 during the duration of characterization. This measure provides measuring the sound pressure and harmonic distortion curves of the suspension device 10 during the characterization period.

Les Figures 2 à 4 représentent trois de ces échantillons avec pour référence le dispositif de suspension 16 de la figure 1. Les maxima locaux correspondent aux sommets des bosses et des creux formés par l'arc de suspension 16 au cours du temps. Le premier maxima 17 et sa projection sur l'arc de suspension 16 à l'état stable (Figure 1) est mesurée, c'est-à-dire le maxima 17 le plus proche du bord intérieur 14 annulaire apte à fixer le dispositif de suspension 10 avec une membrane 15. The Figures 2 to 4 represent three of these samples with reference to the suspension device 16 of the figure 1 . The local maxima correspond to the peaks of the bumps and valleys formed by the suspension arc 16 over time. The first maxima 17 and its projection on the suspension arc 16 in the stable state ( Figure 1 ) is measured, that is to say the maxima 17 closest to the annular inner edge 14 adapted to fix the suspension device 10 with a membrane 15.

Sur la Figure 5, la projection du maxima 17 est repérée sur l'arc de suspension 16 à l'état stable (Figure 1) permettant ainsi de déterminer la position d'au moins une excroissance 20. On the Figure 5 , the projection of the maxima 17 is marked on the suspension arc 16 in the stable state ( Figure 1 ) thus making it possible to determine the position of at least one protrusion 20.

La caractéristique « positionnée de sorte à minimiser l'au moins un mode de résonance » s'interprète ainsi dans ce document comme positionnée sur l'arc de suspension 16 sur le premier maximum local 17. The characteristic "positioned so as to minimize the at least one resonance mode" is thus interpreted in this document as being positioned on the suspension arc 16 on the first local maximum 17.

Lorsque plusieurs positions sont déterminées, il peut être utile de rassembler les positions les plus proches pour éviter les doubles détections qui correspondent à une même faiblesse de l'arc de suspension 16. Pour ce faire, la Figure 5 révèle que les positions 18 détectées sont regroupées suivant des ensembles 19 dont la distance est inférieure à 20% de la distance totale de l'arc de suspension 16 à l'état stable. La position de chaque excroissance 20 est alors une position moyenne 21 entre les positions 18 de chaque ensemble 19. La Figure 6 révèle trois positions moyennes 21 détectées lors d'un exemple d'analyse correspondant aux Figures 1 à 8.When several positions are determined, it may be useful to gather the nearest positions to avoid double detections that correspond to the same weakness of the suspension bow 16. To do this, the Figure 5 reveals that the detected positions 18 are grouped according to sets 19 whose distance is less than 20% of the total distance of the suspension arc 16 in the stable state. The position of each protrusion 20 is then an average position 21 between the positions 18 of each set 19. The Figure 6 reveals three average positions 21 detected during an analysis example corresponding to the Figures 1 to 8 .

Une excroissance 20 est ainsi positionnée sur l'arc de suspension 16 au niveau de la position moyenne 21. La réponse en fréquence du dispositif de suspension 10 peut ainsi être nouvellement étudiée et si la réponse n'est pas satisfaisante, c'est-à-dire que l'arc de suspension 16 amélioré présente encore des modes de résonances préjudiciables, une nouvelle excroissance 20 peut être ajoutée.A protrusion 20 is thus positioned on the suspension arch 16 at the average position 21. The frequency response of the suspension device 10 can thus be newly studied and if the response is not satisfactory, that is to say that is, the improved suspension arc 16 still has detrimental resonance modes, a new protrusion 20 can be added.

La Figure 7 illustre un arc de suspension 16 amélioré selon un premier mode de réalisation de l'invention par trois excroissances 20 dont la position correspond aux positions moyennes 21 détectées lors de trois améliorations consécutives du dispositif de suspension 10. Les excroissances 20 annulaires sont constituées d'une épaisseur de matière régulière de section radiale circulaire.The Figure 7 illustrates an improved suspension arch 16 according to a first embodiment of the invention by three protuberances 20 whose position corresponds to the average positions 21 detected during three consecutive improvements of the suspension device 10. The annular protrusions 20 consist of a regular material thickness of circular radial section.

La Figure 8 illustre que la taille des excroissances 20 annulaires est maîtrisée de sorte que la masse (ou pour un matériau homogène, le volume) de chaque excroissance 20 est comprise entre 150% et 400% de la masse d'une partie de l'arc de suspension 16 sur laquelle l'au moins une excroissance 20 annulaire est positionnée. Ainsi, le volume 25 de l'excroissance 20 est compris entre 150% et 400% du volume 24 de la partie de l'arc de suspension 16 sur laquelle est implantée l'excroissance 20. De préférence, le volume 25 de l'excroissance 20 correspond à 250 % du volume 24 de la partie de l'arc de suspension 16. The Figure 8 illustrates that the size of annular protuberances 20 is controlled so that the mass (or a homogeneous material, the volume) of each protuberance 20 is between 150% and 400% of the mass of a portion of the arc of suspension 16 on which the at least one annular projection 20 is positioned. Thus, the volume 25 of the protuberance 20 is between 150% and 400% of the volume 24 of the part of the arc of suspension 16 on which is located the protuberance 20. Preferably, the volume 25 of the protrusion 20 corresponds to 250% of the volume 24 of the portion of the arc 16 of suspension.

En variante, le poids de chaque excroissance 20 peut être défini numériquement à l'aide d'un modèle numérique du dispositif de suspension 10. La dynamique du dispositif de suspension 10 est alors modélisée numériquement en fonction des mesures des déplacements de l'arc de suspension 16. La taille de l'excroissance 20 est recherchée par simulation numérique du modèle préalablement défini de sorte à minimiser les modes de résonnance et limiter l'impact du poids de l'excroissance 20. Alternatively, the weight of each protrusion 20 can be defined numerically using a numerical model of the suspension device 10. The dynamics of the suspension device 10 is then modeled numerically as a function of the measurements of the displacements of the arc. suspension 16. The size of the protrusion 20 is sought by numerical simulation of the previously defined model so as to minimize the resonance modes and limit the impact of the weight of the protrusion 20.

La taille de l'excroissance 20 est modifiée entre deux simulations numériques pour parcourir le rapport de masse de 150% à 400% avec un pas de calcul prédéfini, environ 10%. Pour chaque simulation, la réponse est observée afin de calculer l'amplitude des oscillations du dispositif de suspension 10 et la rigidité du bord intérieur 14 annulaire. L'amplitude des oscillations du dispositif de suspension 10 permet d'estimer numériquement les modes de résonance, il faut donc que cette amplitude soit minimale. La rigidité du bord intérieur 14 annulaire permet d'estimer numériquement l'impact du poids de l'excroissance 20, il faut également que cette rigidité soit minimale. Plus le poids de l'excroissance 20 augmente, plus l'amplitude diminue et plus la rigidité augmente. La principale préoccupation est de réduire les modes de résonance alors, le poids de l'excroissance 20 sera augmenté numériquement dans le rapport de masse 150% 400% jusqu'à diviser par deux l'amplitude des oscillations par rapport aux variations du dispositif de suspension 10 sans excroissance.The size of the protrusion 20 is changed between two numerical simulations to travel the mass ratio from 150% to 400% with a predefined calculation step, about 10%. For each simulation, the response is observed in order to calculate the amplitude of the oscillations of the suspension device 10 and the rigidity of the annular inner edge 14 . The amplitude of the oscillations of the suspension device 10 makes it possible to estimate numerically the resonance modes, it is therefore necessary that this amplitude be minimal. The rigidity of the annular inner edge 14 makes it possible to estimate numerically the impact of the weight of the protrusion 20, this rigidity must also be minimal. The greater the weight of the protrusion 20 increases, the amplitude decreases and stiffness increases. The main concern is to reduce the resonance modes then, the weight of the protrusion 20 will be increased numerically in the 150% to 400% mass ratio to halve the amplitude of the oscillations relative to the variations of the suspension device 10 without outgrowth.

Dans une autre variante, le poids de chaque excroissance 20 peut être défini en fonction de la distance maximale du maximum local 17 avec l'état stable de l'arc de suspension 16 au cours de la durée de caractérisation tout en restant dans le rapport de masse 150% à 400%.In another variant, the weight of each outgrowth 20 can be defined as a function of the maximum distance of the local maximum 17 with the stable state of the suspension arc 16 during the duration of the characterization while remaining in the ratio of mass 150% to 400%.

Les Figures 9, 10 et 11 révèlent trois modes de réalisation différents dans lesquelles les contraintes appliquées sur le dispositif de suspension sont différentes. Il en résulte que le nombre d'excroissances diffère, à savoir deux pour les Figures 9 et 10 et une seule pour la Figure 11 et que la position des excroissances 20 diffère également entre les Figures 9 à 11.The Figures 9, 10 and 11 disclose three different embodiments in which the stresses applied to the suspension device are different. As a result, the number of excrescences differs, namely two for Figures 9 and 10 and only one for the Figure 11 and that the position of protrusions 20 also differ between Figures 9 to 11 .

L'invention permet ainsi de supprimer uniquement les oscillations de l'arc de suspension 16 qui sont identifiées comme préjudiciables pour la qualité d'écoute. Elle vise cependant à ne pas réduire toutes les oscillations car cela entrainerait une réduction trop importante de la dynamique du haut-parleur. En outre, le poids des excroissances 20 est maîtrisé pour limiter les dégradations induites sur la dynamique d'un haut-parleur.The invention thus makes it possible to suppress only the oscillations of the suspension arc 16 which are identified as detrimental to the listening quality. However, it aims not to reduce all oscillations because it would lead to a reduction of the loudspeaker dynamic too important. In addition, the weight of the excrescences 20 is controlled to limit the degradation induced on the dynamics of a speaker.

L'invention permet ainsi de proposer un procédé de fabrication d'un haut-parleur dont les performances acoustiques sont accrues à l'aide du dispositif de suspension proposé.The invention thus makes it possible to propose a method of manufacturing a loudspeaker whose acoustic performance is increased by means of the proposed suspension device.

Claims (5)

  1. Process for manufacturing a suspension device (10) for a loudspeaker, said device comprising:
    - an annular outer edge (12) able to fasten the suspension device (10) to a frame (13),
    - an annular inner edge (14) able to fasten the suspension device (10) to a membrane (15),
    - a suspension hoop (16) extending annularly between the outer (12) and inner (14) edges,
    - said suspension hoop (16) being able to absorb movement stresses produced at the inner edge (14) by means of deforming the suspension hoop (16) thus forming at least one resonance mode,
    - the suspension hoop (16) comprising at least one annular protuberance (20) positioned in such a way as to minimize at least one suspension hoop resonance mode (16),
    the mass of at least one of these annular protuberances (20) being comprised between 150% and 400% of the mass of a part of the suspension hoop (16) whereupon the annular protuberance (20) is positioned;
    said process comprising the steps of:
    - exciting the inner edge (14) of the suspension device (10),
    - measuring the movements of the suspension hoop (16) in relation to a stable state of the suspension hoop (16) during a characterization period,
    - detecting the position of the first local maximum (17) of the movements of the suspension hoop (16) in relation to the stable state of the suspension hoop (16), and
    - defining a position (18) of a protuberance (20) corresponding to a projection of the first local maximum (17) on the suspension hoop (16) in the stable state.
  2. Process for manufacturing a suspension device according to claim 1, characterized in that the step consisting of defining a position (18) of a protuberance (20) comprises the steps of:
    - defining at least a set (19) of positions (18) wherein the distance between the positions is less than 20% of the total distance of the suspension hoop (16) in the stable state, and
    - determining an average position (21) of at least a set of positions (18) corresponding to the position of the protuberance (20).
  3. Process for manufacturing a suspension device according to claim 1 or 2, characterized in that the step consisting of exciting the inner edge (14) of the suspension device (10) is performed by a characteristic signal wherein the frequencies change within a predetermined frequency range, preferably between 100 Hz and 10 KHz.
  4. Process for manufacturing a suspension device according to one of claims 1 to 3, characterized in that it comprises the steps of:
    - digitally modeling the dynamics of the suspension device (10) according to the measurements, during a characterization period, of the movements of the suspension hoop (16) in relation to a stable state of the suspension hoop (16), and
    - defining the size of the protuberance (20) by means of a digital simulation of the previously defined model in such a way as to minimize the resonance modes and limit the impact of the weight of the protuberance (20).
  5. Process for manufacturing a suspension device according to one of claims 1 to 4, characterized in that it comprises the following steps:
    - once again exciting the inner edge (14) of the suspension device (10) that has been improved by positioning an annular protuberance (20) on the device (10) and when the suspension device (10) still has harmful resonance modes,
    - measuring the movements of the improved suspension hoop (16), i.e., with the annular protuberance (20), in relation to a stable state of the suspension hoop (16) during a second characterization period,
    - detecting the position of the second local maximum (17) of the movements of the improved suspension hoop (16) in relation to a stable state of the suspension hoop (16), and
    - defining a position (18) of a second protuberance (20) corresponding to a projection of the second local maximum (17) on the improved suspension hoop (16) in the stable state.
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FR1553311A FR3035295B1 (en) 2015-04-15 2015-04-15 SUSPENSION DEVICE FOR SPEAKER, METHOD OF MANUFACTURE AND SPEAKER THEREFOR
PCT/EP2016/058035 WO2016166111A1 (en) 2015-04-15 2016-04-12 Suspension device for a loudspeaker, manufacturing method and associated loudspeakers

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FR3035295B1 (en) * 2015-04-15 2017-04-21 Focal Jmlab SUSPENSION DEVICE FOR SPEAKER, METHOD OF MANUFACTURE AND SPEAKER THEREFOR
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WO2016166111A1 (en) 2016-10-20
FR3035295B1 (en) 2017-04-21
US20180124519A1 (en) 2018-05-03
FR3035295A1 (en) 2016-10-21
US10171913B2 (en) 2019-01-01
EP3284269A1 (en) 2018-02-21

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