EP3063949B1 - Loudspeaker enclosure with at least one loudspeaker with a convex mobile membrane exhibiting continuity of shape with an adjacent member - Google Patents

Loudspeaker enclosure with at least one loudspeaker with a convex mobile membrane exhibiting continuity of shape with an adjacent member Download PDF

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Publication number
EP3063949B1
EP3063949B1 EP14783637.3A EP14783637A EP3063949B1 EP 3063949 B1 EP3063949 B1 EP 3063949B1 EP 14783637 A EP14783637 A EP 14783637A EP 3063949 B1 EP3063949 B1 EP 3063949B1
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EP
European Patent Office
Prior art keywords
membrane
box
mobile
loudspeaker
loudspeakers
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.)
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Application number
EP14783637.3A
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German (de)
French (fr)
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EP3063949A1 (en
Inventor
Emmanuel Nardin
Pierre-Emmnanuel CALMEL
Jean-Loup AFRESNE
Julien Laurent BERGERE
Antoine PETROFF
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Devialet SA
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Devialet SA
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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
    • H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only 
    • H04R1/24—Structural combinations of separate transducers or of two parts of the same transducer and responsive respectively to two or more frequency ranges
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
    • H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only 
    • H04R1/28—Transducer mountings or enclosures modified by provision of mechanical or acoustic impedances, e.g. resonator, damping means
    • H04R1/2869—Reduction of undesired resonances, i.e. standing waves within enclosure, or of undesired vibrations, i.e. of the enclosure itself
    • H04R1/2892—Mountings or supports for transducers
    • H04R1/2896—Mountings or supports for transducers for loudspeaker transducers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R5/00—Stereophonic arrangements
    • H04R5/02—Spatial or constructional arrangements of 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
    • H04R7/127—Non-planar diaphragms or cones dome-shaped
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2201/00—Details of transducers, loudspeakers or microphones covered by H04R1/00 but not provided for in any of its subgroups
    • H04R2201/02—Details casings, cabinets or mounting therein for transducers covered by H04R1/02 but not provided for in any of its subgroups
    • H04R2201/028—Structural combinations of loudspeakers with built-in power amplifiers, e.g. in the same acoustic enclosure

Definitions

  • a loudspeaker In order to preserve a high quality of timbre and a spatial coherence favoring the obtaining of a wide and deep stereophonic image, a loudspeaker must have an amplitude and phase response as linear as possible for the range of audible frequencies, favoring the direction of the listening area over its entire width and height.
  • Conventional acoustic speakers have a notable limitation to obtaining a spatially coherent sound, namely the interference phenomena between the acoustic radiation from loudspeakers constituting primary acoustic sources, and the acoustic radiation from secondary acoustic sources created by diffraction phenomena.
  • US 4,295,006 A describes an enclosure comprising an ellipsoidal casing and a plurality of loudspeakers the outer surface of the membranes of which is flush with the outer surface of the enclosure of the enclosure.
  • US 3 925 626 A describes an enclosure comprising a spherical box and a loudspeaker, the membrane of which has a curvature which appears to be analogous to the curvature of the box on the figure 4 .
  • the object of the invention is to provide an acoustic enclosure which further limits diffraction phenomena.
  • the subject of the invention is an acoustic enclosure according to claim 1.
  • the enclosure 10 comprises at least a first loudspeaker 30A having a first convex mobile membrane 32A, the convexity being turned towards the outside of the enclosure, and a member 12 surrounding the first mobile membrane 32A and comprising an outer surface 12A limited by an internal edge ⁇ 'located opposite the mobile membrane 32A.
  • the member 12 is a box.
  • the first mobile membrane 32A has a peripheral edge ⁇ located opposite the member 12 and forming a closed loop.
  • the first movable membrane 32A and the member 12 have a shape adapted so that, over a continuous portion ⁇ "of the peripheral edge ⁇ representing at least 25%, preferably at least 50%, and even more preferably at least 90 %, of the length of the peripheral edge ⁇ , for any first point M of the continuous portion ⁇ "and any second point M 'located on the internal edge ⁇ ' at a location such as the distance between the first point M and the second point M 'is minimal, the first mobile membrane 32A has at the first point M a first tangent plane P M , and the external surface 12A of the member 12 has at the second point M' a second tangent plane P ' M' .
  • the first tangent plane P M and the second tangent plane P ' M' are substantially merged with one another.
  • the outer surface 12A of the member 12 is shaped so that, for any third point M '"( figures 4 and 5 ) located on the external surface 12A of the member 12 at a distance D M ''' from the continuous portion ⁇ "less than or equal to 1/100 th of the perimeter of the mobile membrane, preferably at 1/30 th of the perimeter of the mobile membrane, and even more preferably at 1/10 th of the perimeter of the mobile membrane, any plane arc ⁇ "'belonging to the external surface 12A and passing through the third point M'" has a radius at the third point M '" of curvature R M ''' greater than or equal to 1/100 th of the perimeter of the mobile membrane, preferably greater than or equal to 1/30 th of the perimeter of the mobile membrane, and even more preferably greater than or equal to 1/10 th of the perimeter of the mobile membrane.
  • the enclosure 10 is an active acoustic enclosure, that is to say comprising a set of loudspeakers arranged in the box 12.
  • the enclosure 10 also comprises inside the box 12 an amplifier 14 specific to each loud speaker. This amplifier is connected to an excitation source such as an audio player.
  • the enclosure 10 has on the outside a generally oblong shape of axis X-X more precisely in the form of an ogive with a front end 16 of spherical shape.
  • the front end 16 externally forms a spherical zone 17 whose center O is disposed on the X-X axis.
  • the spherical zone 17 is extended, towards the rear, by a protuberance 18 in which the amplifier 14 is housed.
  • the box 12 has a flat shape at the bottom to form a foot 20 allowing the enclosure to be stationed in a stable position on a horizontal surface.
  • the enclosure 10 is symmetrical about a plane perpendicular to the surface of the foot 20 and passing through the axis XX.
  • the spherical zone 17 extends over an angular extent ⁇ substantially equal to 180 ° and more generally advantageously greater than 150 °.
  • this spherical zone 17 extends angularly over an angle ⁇ of 270 ° and more generally preferably greater than 225 °.
  • the enclosure 10 comprises a plurality of loudspeakers 30A, 30B, which are for example bass loudspeakers.
  • Each loudspeaker of said plurality respectively comprises a movable membrane 32A, 32B.
  • basic speaker is understood to mean a speaker suitable for diffusing sound waves of frequencies below 1000 Hz, preferably below 500 Hz, even more preferably below 150 Hz.
  • the enclosure 10 comprises for example two bass loudspeakers 30A, 30B arranged symmetrically with respect to the axis XX and opening into the spherical area 17.
  • the two loudspeakers are arranged along the same axis YY extending perpendicularly to axis XX of the enclosure.
  • the Y-Y axis is parallel to the bearing surface 20.
  • the X-X and Y-Y axes intersect at the point O forming the center of the spherical region 17.
  • the loudspeakers 30A, 30B form an angle equal to 360 ° divided by two, therefore by 180 °, between them around a Z-Z distribution axis substantially perpendicular to the X-X axis and substantially perpendicular to the Y-Y axis.
  • These two loudspeakers have a membrane 32A, 32B in the form of a solid spherical cap with the same curvature as the spherical zone 17.
  • the spherical membrane extends the spherical zone 17 in a substantially continuous manner, when the membrane 32A, 32B is at rest.
  • the spherical zone 17 of the box and the surface of the spherical membranes 32A, 32B of the two woofers 30A, 30B define a spherical surface of extent at least equal to the surface of revolution generated by rotation of a spherical membrane 32A, 32B of a woofer 30A, 30B over at least 180 ° around an axis XX perpendicular to the axis YY of the two spherical membranes 32A, 32B.
  • an annular peripheral gap 34A, 34B separates the membrane 32A, 32B from the loudspeakers of the spherical zone 17.
  • the width i of this annular gap between the membrane of each woofer and the box, measured radially in the plane of the circumference of the speaker membrane is less than 1/100 th of the perimeter of the speaker membrane. Preferably it is less than 1/200 th and even more preferably less than 1/400 th .
  • this width is less than 5 mm, preferably less than 2.5 mm and even more preferably less than 1.25 mm.
  • the diameter d of the circle delimited by the spherical cap forming the membrane 32A, 32B of each bass speaker is greater than half of the diameter denoted D of the spherical zone 17 of the box. Preferably, it is greater than 2/3 of this diameter D and even more preferably greater than 3/4 of this 3/4 diameter.
  • the diameter D of the spherical zone is then between 320 mm and 220 mm.
  • the two loudspeakers 30A and 30B are identical and are mounted back to back.
  • the fixed parts of the two loudspeakers form frames42A, 42B which are rigidly linked to one another.
  • these frames are secured by any means suitable for the box 12.
  • Said plurality of loudspeakers 30A, 30B are advantageously arranged such that the reaction forces of the movable membranes 32A, 32B on the frames 42A, 42B have a zero sum.
  • FIG. 3 On the figure 3 , are schematically illustrated the fixed magnets 44A, 44B of the two woofers 30A, 30B.
  • a piston 46A, 46B on which a coil is provided is mounted movable in translation with respect to each magnet 44A, 44B.
  • This piston carries at its end the spherical membrane 32A, 32B.
  • the membrane is made of metal, in particular of aluminum, magnesium, titanium.
  • the membrane is not very deformable. It is linked to the loudspeaker frame by a sealing device, for example a bellows 48A, 48B.
  • the membrane is made of plastic, composite material, paper, etc.
  • the two woofers 30A, 30B are designed so that the maximum axial displacement along the YY axis of the membrane of each bass speaker is greater than 1/50 th of the diameter D of the spherical zone 17 of the box.
  • this displacement is greater than 1/20 th of the diameter D of the spherical zone 17 and even more preferably greater than 1/5 th of the diameter D of the spherical zone 17.
  • the enclosure 10 further comprises a loudspeaker 50, for example a midrange loudspeaker, arranged along the axis XX and opening into the spherical zone 17.
  • the loudspeaker 50 has a membrane 52 forming an incomplete spherical cap. openwork at its top.
  • This spherical membrane 52 has a radius equal to the radius of curvature of the spherical zone 17 and extends in the extension of this spherical region to form a substantially continuous spherical surface when the membrane 52 is at rest.
  • midrange loudspeaker a loudspeaker suitable for diffusing sound waves of frequencies ranging from 300 Hz to 3 kHz, or even from 150 Hz to 6 kHz.
  • a tweeter 60 is disposed axially in the center of the speaker 50.
  • tweeter is meant a loudspeaker suitable for diffusing sound waves of frequencies ranging from 3 kHz to 20 kHz, or even from 1 kHz to 40 kHz.
  • the tweeter also has a spherical membrane with a radius equal to the radius of the spherical zone 17 and fits into the envelope of the spherical zone 17.
  • the convex mobile membranes of the loudspeakers follow the shape of the box on either side of the intervals separating the mobile membranes and the box.
  • the diffraction phenomena are very reduced.
  • the bass speakers placed back to back have identical displacements of their membrane, the frames of the two speakers remaining stationary relative to the box, the reaction forces applied by the membranes on the frames canceling each other out.
  • the enclosure 100 is analogous to the enclosure 10 shown in the figures 1 to 5 .
  • the enclosure 100 comprises a loudspeaker 30A having a first convex movable membrane 32A, the convexity being turned towards the outside of the enclosure, and a member 12 surrounding the first movable membrane 32A and comprising an outer surface 12A.
  • the member 12 is for example a box.
  • the enclosure 100 is applied against a wall 110 defining a flat surface 110A.
  • the wall 110 is for example a vertical wall, or the top of a table (not shown).
  • the member 12 comprises a peripheral portion 112 radially distal with respect to the mobile membrane 32A, and an internal portion 114 radially proximal with respect to the mobile membrane 32A.
  • the peripheral portion 112 is for example convex.
  • the peripheral portion 112 defines a closed peripheral edge B.
  • the peripheral portion 112 surrounds the internal portion 114.
  • the internal portion 114 is for example concave.
  • an inflection zone S which is a closed line in the example shown.
  • the member 12 has a shape adapted so that, on a continuous portion B 'of the peripheral edge B representing at least 25%, preferably at least 50%, even more preferably at least 90%, of the length of the peripheral edge B, for any point N of the continuous portion B ', the external surface 12A of the member 12 has at point N a third tangent plane P N.
  • the third tangent plane P N and the flat surface 110A are substantially the same.
  • the enclosure 100 makes it possible to minimize the diffraction and the reflection linked to the presence of the wall 110 in the immediate vicinity of the enclosure.

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

Description

La présente invention concerne une enceinte acoustique, du type comportant :

  • au moins un haut-parleur ayant une membrane mobile convexe, la convexité étant tournée vers l'extérieur de l'enceinte, et
  • un organe entourant la membrane mobile et comportant une surface externe limitée par un bord interne situé en vis-à-vis de la membrane mobile,
la membrane mobile comportant un bord périphérique situé en vis-à-vis du bord interne de l'organe et formant une boucle fermée.The present invention relates to an acoustic enclosure, of the type comprising:
  • at least one loudspeaker having a convex movable membrane, the convexity being turned towards the exterior of the enclosure, and
  • a member surrounding the mobile membrane and comprising an external surface limited by an internal edge located opposite the mobile membrane,
the movable membrane comprising a peripheral edge situated opposite the internal edge of the organ and forming a closed loop.

Afin de préserver une grande qualité de timbre et une cohérence spatiale favorisant l'obtention d'une image stéréophonique large et profonde, une enceinte acoustique doit avoir une réponse en amplitude et en phase aussi linéaire que possible pour l'étendue des fréquences audibles, privilégiant la direction de la zone d'écoute sur toute son étendue en largeur et en hauteur.In order to preserve a high quality of timbre and a spatial coherence favoring the obtaining of a wide and deep stereophonic image, a loudspeaker must have an amplitude and phase response as linear as possible for the range of audible frequencies, favoring the direction of the listening area over its entire width and height.

Les enceintes acoustiques classiques présentent une limitation notable à l'obtention d'un son cohérent spatialement, à savoir les phénomènes d'interférence entre le rayonnement acoustique de haut-parleurs constituant des sources acoustiques primaires, et le rayonnement acoustique de sources acoustiques secondaires créées par des phénomènes de diffraction.Conventional acoustic speakers have a notable limitation to obtaining a spatially coherent sound, namely the interference phenomena between the acoustic radiation from loudspeakers constituting primary acoustic sources, and the acoustic radiation from secondary acoustic sources created by diffraction phenomena.

US 4 295 006 A décrit une enceinte comprenant un caisson ellipsoïdal et une pluralité de haut-parleurs dont la surface extérieure des membranes affleure la surface extérieure du caisson de l'enceinte. US 4,295,006 A describes an enclosure comprising an ellipsoidal casing and a plurality of loudspeakers the outer surface of the membranes of which is flush with the outer surface of the enclosure of the enclosure.

US 3 925 626 A décrit une enceinte comprenant un caisson sphérique et un haut-parleur dont la membrane présente une courbure qui semble analogue à la courbure du caisson sur la figure 4. US 3 925 626 A describes an enclosure comprising a spherical box and a loudspeaker, the membrane of which has a curvature which appears to be analogous to the curvature of the box on the figure 4 .

L'invention a pour but de proposer une enceinte acoustique limitant davantage les phénomènes de diffraction.The object of the invention is to provide an acoustic enclosure which further limits diffraction phenomena.

A cet effet, l'invention a pour objet une enceinte acoustique selon la revendication 1.To this end, the subject of the invention is an acoustic enclosure according to claim 1.

Suivant des modes particuliers de réalisation, l'enceinte acoustique comporte l'une ou plusieurs des caractéristiques suivantes :

  • la surface externe de l'organe est conformée pour que, pour tout troisième point situé sur la surface externe de l'organe à une distance de la portion continue inférieure ou égale à 1/100e du périmètre de la membrane mobile, préférentiellement inférieure ou égale 1/30e, et encore plus préférentiellement inférieure ou égale à 1/10e du périmètre de la membrane mobile, tout arc plan appartenant à la surface externe et passant par le troisième point présente au troisième point un rayon de courbure supérieur ou égal à 1/100e du périmètre de la membrane mobile, préférentiellement supérieur ou égal à 1/30e du périmètre de la membrane mobile, et encore plus préférentiellement supérieur ou égal à 1/10e du périmètre de la membrane mobile ;
  • la zone sphérique du caisson et la surface des membranes mobiles définissent une surface sphérique d'étendue supérieure à la surface de révolution engendrée par rotation d'une membrane mobile d'un haut-parleur sur au moins 180° autour d'un axe sensiblement perpendiculaire à l'axe de répartition ;
  • un intervalle annulaire sépare la périphérie de la membrane mobile de chaque haut-parleur et le caisson, et la largeur de cet intervalle mesurée radialement est inférieure à 1/100e de la circonférence des membranes mobiles ;
  • le diamètre du cercle délimité par chaque membrane mobile est supérieur à la moitié du diamètre de la zone sphérique du caisson ;
  • le débattement axial maximal de la membrane mobile de chaque haut-parleur de ladite pluralité est supérieur à 1/50e du diamètre de la zone sphérique du caisson ;
  • les parties fixes des haut-parleurs de ladite pluralité sont liées rigidement au caisson ;
  • la zone sphérique, dans laquelle se trouvent les haut-parleurs de ladite pluralité, est prolongée par une excroissance conférant extérieurement au caisson une forme généralement oblongue ;
  • ladite pluralité de haut-parleurs comprend deux haut-parleurs ;
  • l'enceinte acoustique comprend en outre au moins un premier autre haut-parleur disposé au travers du caisson et orienté suivant un axe sensiblement perpendiculaire à l'axe de répartition, le premier autre haut-parleur comportant une membrane convexe inscrite dans une sphère de même courbure que la courbure de la zone sphérique du caisson et prolongeant sensiblement la zone sphérique du caisson pour former, en position de repos de la membrane convexe, une surface sphérique sensiblement continue ;
  • l'enceinte acoustique comprend en outre un deuxième autre haut-parleur disposé au centre du premier autre haut-parleur et coaxial avec le premier autre haut-parleur ;
  • les membranes mobiles sont métalliques.
According to particular embodiments, the acoustic enclosure has one or more of the following characteristics:
  • the external surface of the organ is shaped so that, for any third point located on the external surface of the organ at a distance from the continuous portion less than or equal to 1/100 th of the perimeter of the mobile membrane, preferably less than or equal to 1/30 th , and even more preferably less than or equal to 1/10 th of the perimeter of the mobile membrane, any plane arc belonging to the external surface and passing through the third point has at the third point a radius of curvature greater than or equal to 1/100 th of the perimeter of the mobile membrane, preferably greater than or equal to 1/30 th of the perimeter of the mobile membrane, and even more preferably greater than or equal to 1 / 10th the perimeter of the movable membrane;
  • the spherical zone of the box and the surface of the mobile membranes define a spherical surface of greater extent than the surface of revolution generated by rotation of a mobile membrane of a loudspeaker over at least 180 ° around an axis substantially perpendicular to the distribution axis;
  • an annular gap separates the periphery of the mobile membrane of each speaker and the box, and the width of this gap measured radially is less than 1/100 th of the circumference of the mobile membranes;
  • the diameter of the circle delimited by each mobile membrane is greater than half the diameter of the spherical zone of the box;
  • the maximum axial displacement of the movable membrane of each loudspeaker of said plurality is greater than 1/50 th of the diameter of the spherical zone of the box;
  • the fixed parts of the loudspeakers of said plurality are rigidly linked to the box;
  • the spherical zone, in which the loudspeakers of said plurality are located, is extended by a protuberance giving the box a generally oblong shape on the outside;
  • said plurality of loudspeakers comprises two loudspeakers;
  • the acoustic enclosure further comprises at least a first other loudspeaker arranged through the box and oriented along an axis substantially perpendicular to the distribution axis, the first other loudspeaker comprising a convex membrane inscribed in a sphere of the same curvature than the curvature of the spherical zone of the box and substantially extending the spherical zone of the box to form, in the rest position of the convex membrane, a substantially continuous spherical surface;
  • the acoustic enclosure further comprises a second further loudspeaker disposed at the center of the first further loudspeaker and coaxial with the first further loudspeaker;
  • the mobile membranes are metallic.

L'invention sera mieux comprise à la lecture de la description qui va suivre, donnée uniquement à titre d'exemple et faite en se référant aux dessins sur lesquels :

  • la figure 1 est une vue en élévation de côté d'une enceinte acoustique selon l'invention ;
  • la figure 2 est une vue de face de l'enceinte représentée sur la figure 1 ; et
  • la figure 3 est une vue en coupe schématique de dessus de l'enceinte représentée sur les figures 1 et 2 ;
  • la figure 4 est une vue de détail de l'intervalle séparant la membrane mobile du haut-parleur et l'organe entourant le haut-parleur de l'enceinte représentée sur les figures 1 à 3, la vue étant réalisée selon une direction sensiblement perpendiculaire à la membrane mobile ;
  • la figure 5 est une vue de détail de l'intervalle représenté sur la figure 4, la vue étant réalisée selon une direction sensiblement parallèle à l'intervalle ;
  • la figure 6 est une vue de profil d'une enceinte ; et
  • la figure 7 est une vue de face de l'enceinte représentée sur la figure 6.
The invention will be better understood on reading the description which will follow, given solely by way of example and made with reference to the drawings in which:
  • the figure 1 is a side elevational view of an acoustic enclosure according to the invention;
  • the figure 2 is a front view of the enclosure shown in figure 1 ; and
  • the figure 3 is a schematic sectional view from above of the enclosure shown in figures 1 and 2 ;
  • the figure 4 is a detail view of the gap separating the movable membrane of the loudspeaker and the member surrounding the loudspeaker of the enclosure shown in the figures 1 to 3 , the view being taken in a direction substantially perpendicular to the mobile membrane;
  • the figure 5 is a detailed view of the interval shown on the figure 4 , the view being taken in a direction substantially parallel to the gap;
  • the figure 6 is a side view of an enclosure; and
  • the figure 7 is a front view of the enclosure shown in figure 6 .

En référence aux figure 1 à 5, on décrit une enceinte acoustique 10 selon l'invention.With reference to figure 1 to 5 , there is described an acoustic enclosure 10 according to the invention.

L'enceinte 10 comprend au moins un premier haut-parleur 30A ayant une première membrane mobile 32A convexe, la convexité étant tournée vers l'extérieur de l'enceinte, et un organe 12 entourant la première membrane mobile 32A et comportant une surface externe 12A limitée par un bord interne Γ' situé en vis-à-vis de la membrane mobile 32A.The enclosure 10 comprises at least a first loudspeaker 30A having a first convex mobile membrane 32A, the convexity being turned towards the outside of the enclosure, and a member 12 surrounding the first mobile membrane 32A and comprising an outer surface 12A limited by an internal edge Γ 'located opposite the mobile membrane 32A.

L'organe 12 est un caisson.The member 12 is a box.

La première membrane mobile 32A comporte un bord périphérique Γ situé en vis-à-vis de l'organe 12 et formant une boucle fermée.The first mobile membrane 32A has a peripheral edge Γ located opposite the member 12 and forming a closed loop.

Comme visible sur les figures 4 et 5, la première membrane mobile 32A et l'organe 12 ont une forme adaptée pour que, sur une portion continue Γ" du bord périphérique Γ représentant au moins 25%, de préférence au moins 50%, et de manière encore plus préférentielle au moins 90%, de la longueur du bord périphérique Γ, pour tout premier point M de la portion continue Γ" et tout second point M' situé sur le bord interne Γ' à un emplacement tel que la distance entre le premier point M et le second point M' est minimale, la première membrane mobile 32A possède au premier point M un premier plan tangent PM, et la surface externe 12A de l'organe 12 possède au second point M' un second plan tangent P'M'.As visible on the figures 4 and 5 , the first movable membrane 32A and the member 12 have a shape adapted so that, over a continuous portion Γ "of the peripheral edge Γ representing at least 25%, preferably at least 50%, and even more preferably at least 90 %, of the length of the peripheral edge Γ, for any first point M of the continuous portion Γ "and any second point M 'located on the internal edge Γ' at a location such as the distance between the first point M and the second point M 'is minimal, the first mobile membrane 32A has at the first point M a first tangent plane P M , and the external surface 12A of the member 12 has at the second point M' a second tangent plane P 'M' .

Le premier plan tangent PM et le second plan tangent P'M' sont sensiblement confondus l'un avec l'autre.The first tangent plane P M and the second tangent plane P 'M' are substantially merged with one another.

Par « sensiblement confondus », on entend que le premier plan tangent PM et le second plan tangent P'M' ne se distinguent pas sensiblement l'un de l'autre à l'œil humain. Par exemple :

  • d'une part, le premier point M se situe à une distance DM du second plan tangent P'M' inférieure à 1/100e du périmètre de la première membrane mobile 32A, préférentiellement à 1/200e du périmètre de la membrane mobile 32A, et encore plus préférentiellement à 1/400e du périmètre de la membrane mobile 32A. Par exemple, pour une membrane mobile dont le pourtour forme un cercle de 160 mm de diamètre et de 500 mm de périmètre, le premier point M se situe à une distance DM du second plan tangent P'M' inférieure à 5 mm, de préférence inférieure à 2,5 mm, de manière encore plus préférentielle inférieure à 1,25 mm, et
  • d'autre part, le premier plan tangent PM et le second plan tangent P'M' forment entre eux un angle αM inférieur à 10°, de préférence inférieur à 5°.
The term “substantially coincident” is understood to mean that the first tangent plane P M and the second tangent plane P 'M' do not differ appreciably from one another to the human eye. For example :
  • on the one hand, the first point M is located at a distance D M from the second tangent plane P 'M' less than 1/100 th of the perimeter of the first mobile membrane 32A, preferably at 1/200 th of the perimeter of the mobile membrane 32A, and even more preferably at 1/400 th of the perimeter of the mobile membrane 32A. For example, for a mobile membrane whose periphery forms a circle 160 mm in diameter and 500 mm in perimeter, the first point M is located at a distance D M from the second tangent plane P 'M' of less than 5 mm, of preferably less than 2.5 mm, even more preferably less than 1.25 mm, and
  • on the other hand, the first tangent plane P M and the second tangent plane P 'M' form between them an angle α M less than 10 °, preferably less than 5 °.

La surface externe 12A de l'organe 12 est conformée pour que, pour tout troisième point M'" (figures 4 et 5) situé sur la surface externe 12A de l'organe 12 à une distance DM''' de la portion continue Γ" inférieure ou égale à 1/100e du périmètre de la membrane mobile, préférentiellement à 1/30e du périmètre de la membrane mobile, et encore plus préférentiellement à 1/10e du périmètre de la membrane mobile, tout arc plan Γ"' appartenant à la surface externe 12A et passant par le troisième point M'" présente au troisième point M'" un rayon de courbure RM''' supérieur ou égal à 1/100e du périmètre de la membrane mobile, préférentiellement supérieur ou égal à 1/30e du périmètre de la membrane mobile, et encore plus préférentiellement supérieur ou égal à 1/10e du périmètre de la membrane mobile.The outer surface 12A of the member 12 is shaped so that, for any third point M '"( figures 4 and 5 ) located on the external surface 12A of the member 12 at a distance D M ''' from the continuous portion Γ "less than or equal to 1/100 th of the perimeter of the mobile membrane, preferably at 1/30 th of the perimeter of the mobile membrane, and even more preferably at 1/10 th of the perimeter of the mobile membrane, any plane arc Γ "'belonging to the external surface 12A and passing through the third point M'" has a radius at the third point M '" of curvature R M ''' greater than or equal to 1/100 th of the perimeter of the mobile membrane, preferably greater than or equal to 1/30 th of the perimeter of the mobile membrane, and even more preferably greater than or equal to 1/10 th of the perimeter of the mobile membrane.

Dans l'exemple illustré sur les figures 1 à 3, l'enceinte 10 est une enceinte acoustique active, c'est-à-dire comportant un ensemble de haut-parleurs disposés dans le caisson 12. L'enceinte 10 comporte également à l'intérieur du caisson 12 un amplificateur 14 propre à chaque haut-parleur. Cet amplificateur est relié à une source d'excitation tel qu'un lecteur audio.In the example shown on figures 1 to 3 , the enclosure 10 is an active acoustic enclosure, that is to say comprising a set of loudspeakers arranged in the box 12. The enclosure 10 also comprises inside the box 12 an amplifier 14 specific to each loud speaker. This amplifier is connected to an excitation source such as an audio player.

L'enceinte 10 présente extérieurement une forme générale oblongue d'axe X-X plus précisément en forme d'ogive avec une extrémité avant 16 de forme sphérique. L'extrémité avant 16 forme extérieurement une zone sphérique 17 dont le centre O est disposé sur l'axe X-X.The enclosure 10 has on the outside a generally oblong shape of axis X-X more precisely in the form of an ogive with a front end 16 of spherical shape. The front end 16 externally forms a spherical zone 17 whose center O is disposed on the X-X axis.

La zone sphérique 17 est prolongée, vers l'arrière, par une excroissance 18 dans laquelle est logé l'amplificateur 14.The spherical zone 17 is extended, towards the rear, by a protuberance 18 in which the amplifier 14 is housed.

Sur sa longueur, le caisson 12 présente une forme plane en partie inférieure pour former un pied 20 permettant la station de l'enceinte en position stable sur une surface horizontale.Along its length, the box 12 has a flat shape at the bottom to form a foot 20 allowing the enclosure to be stationed in a stable position on a horizontal surface.

L'enceinte 10 est symétrique autour d'un plan perpendiculaire à la surface du pied 20 et passant par l'axe X-X.The enclosure 10 is symmetrical about a plane perpendicular to the surface of the foot 20 and passing through the axis XX.

Dans le plan de la figure 1, c'est-à-dire vue latéralement, la zone sphérique 17 s'étend sur une étendue angulaire β sensiblement égale à 180° et plus généralement avantageusement supérieure à 150°.In the plane of the figure 1 , that is to say viewed laterally, the spherical zone 17 extends over an angular extent β substantially equal to 180 ° and more generally advantageously greater than 150 °.

Dans le plan de la figure 2, c'est-à-dire vue en bout, cette zone sphérique 17 s'étend angulairement sur un angle α de 270° et plus généralement de préférence supérieur à 225°.In the plane of the figure 2 , that is to say seen from the end, this spherical zone 17 extends angularly over an angle α of 270 ° and more generally preferably greater than 225 °.

L'enceinte 10 comporte une pluralité de haut-parleurs 30A, 30B, qui sont par exemple des haut-parleurs de grave. Chaque haut-parleur de ladite pluralité comprend respectivement une membrane mobile 32A, 32B.The enclosure 10 comprises a plurality of loudspeakers 30A, 30B, which are for example bass loudspeakers. Each loudspeaker of said plurality respectively comprises a movable membrane 32A, 32B.

Par haut-parleur de grave, on entend un haut-parleur adapté pour diffuser des ondes sonores de fréquences inférieures à 1000 Hz, préférentiellement inférieures à 500 Hz, encore plus préférentiellement inférieures à 150 Hz.The term “bass speaker” is understood to mean a speaker suitable for diffusing sound waves of frequencies below 1000 Hz, preferably below 500 Hz, even more preferably below 150 Hz.

L'enceinte 10 comporte par exemple deux haut-parleurs de grave 30A, 30B disposés symétriquement par rapport à l'axe X-X et débouchant dans la plage sphérique 17. Les deux haut-parleurs sont disposés suivant un même axe Y-Y s'étendant perpendiculairement à l'axe X-X de l'enceinte. L'axe Y-Y est parallèle à la surface d'appui 20. Les axes X-X et Y-Y sont sécants au point O formant le centre de la région sphérique 17.The enclosure 10 comprises for example two bass loudspeakers 30A, 30B arranged symmetrically with respect to the axis XX and opening into the spherical area 17. The two loudspeakers are arranged along the same axis YY extending perpendicularly to axis XX of the enclosure. The Y-Y axis is parallel to the bearing surface 20. The X-X and Y-Y axes intersect at the point O forming the center of the spherical region 17.

Les haut-parleurs 30A, 30B forment un angle égal à 360° divisé par deux, donc de 180°, entre eux autour d'un axe de répartition Z-Z sensiblement perpendiculaire à l'axe X-X et sensiblement perpendiculaire à l'axe Y-Y.The loudspeakers 30A, 30B form an angle equal to 360 ° divided by two, therefore by 180 °, between them around a Z-Z distribution axis substantially perpendicular to the X-X axis and substantially perpendicular to the Y-Y axis.

Ces deux haut-parleurs présentent une membrane 32A, 32B en forme de calotte sphérique pleine de même courbure que la zone sphérique 17. La membrane sphérique prolonge la zone sphérique 17 de manière sensiblement continue, lorsque la membrane 32A, 32B est au repos.These two loudspeakers have a membrane 32A, 32B in the form of a solid spherical cap with the same curvature as the spherical zone 17. The spherical membrane extends the spherical zone 17 in a substantially continuous manner, when the membrane 32A, 32B is at rest.

Ainsi, de préférence, la zone sphérique 17 du caisson et la surface des membranes sphériques 32A, 32B des deux haut-parleurs de grave 30A, 30B définissent une surface sphérique d'étendue au moins égale à la surface de révolution engendrée par rotation d'une membrane sphérique 32A, 32B d'un haut-parleur de grave 30A, 30B sur au moins 180° autour d'un axe X-X perpendiculaire à l'axe Y-Y des deux membranes sphériques 32A, 32B.Thus, preferably, the spherical zone 17 of the box and the surface of the spherical membranes 32A, 32B of the two woofers 30A, 30B define a spherical surface of extent at least equal to the surface of revolution generated by rotation of a spherical membrane 32A, 32B of a woofer 30A, 30B over at least 180 ° around an axis XX perpendicular to the axis YY of the two spherical membranes 32A, 32B.

Un intervalle périphérique annulaire 34A, 34B sépare la membrane 32A, 32B des haut-parleurs de la zone sphérique 17. De préférence, la largeur i de cet intervalle annulaire entre la membrane de chaque haut-parleur de grave et le caisson, mesurée radialement dans le plan de la circonférence de la membrane des haut-parleurs est inférieure à 1/100e du périmètre de la membrane du haut-parleur. De préférence, elle est inférieure à 1/200e et de manière encore plus préférentielle inférieure à 1/400e. Ainsi, par exemple pour un haut-parleur de circonférence de 500 mm, cette largeur est inférieure à 5 mm, de préférence inférieure à 2,5 mm et de manière encore plus préférentielle inférieure à 1,25 mm.An annular peripheral gap 34A, 34B separates the membrane 32A, 32B from the loudspeakers of the spherical zone 17. Preferably, the width i of this annular gap between the membrane of each woofer and the box, measured radially in the plane of the circumference of the speaker membrane is less than 1/100 th of the perimeter of the speaker membrane. Preferably it is less than 1/200 th and even more preferably less than 1/400 th . Thus, for example for a loudspeaker with a circumference of 500 mm, this width is less than 5 mm, preferably less than 2.5 mm and even more preferably less than 1.25 mm.

Avantageusement, le diamètre d du cercle délimité par la calotte sphérique formant la membrane 32A, 32B de chaque haut-parleur de basse est supérieur à la moitié du diamètre noté D de la zone sphérique 17 du caisson. De préférence, il est supérieur au 2/3 de ce diamètre D et encore plus préférentiellement supérieur au 3/4 de ce diamètre 3/4.Advantageously, the diameter d of the circle delimited by the spherical cap forming the membrane 32A, 32B of each bass speaker is greater than half of the diameter denoted D of the spherical zone 17 of the box. Preferably, it is greater than 2/3 of this diameter D and even more preferably greater than 3/4 of this 3/4 diameter.

Par exemple, pour un diamètre d du haut-parleur de grave de 160 mm, le diamètre D de la zone sphérique est compris alors entre 320 mm et 220 mm.For example, for a diameter d of the woofer speaker of 160 mm, the diameter D of the spherical zone is then between 320 mm and 220 mm.

Les deux haut-parleurs 30A et 30B sont identiques et sont montés dos à dos. Ainsi, les parties fixes des deux haut-parleurs forment des châssis42A, 42B qui sont rigidement liés l'un à l'autre. En outre, ces châssis sont solidarisés par tout moyen adapté au caisson 12.The two loudspeakers 30A and 30B are identical and are mounted back to back. Thus, the fixed parts of the two loudspeakers form frames42A, 42B which are rigidly linked to one another. In addition, these frames are secured by any means suitable for the box 12.

Ladite pluralité de haut-parleurs 30A, 30B est avantageusement disposée de telle manière que les forces de réaction des membranes mobiles 32A, 32B sur les châssis 42A, 42B ont une somme nulle.Said plurality of loudspeakers 30A, 30B are advantageously arranged such that the reaction forces of the movable membranes 32A, 32B on the frames 42A, 42B have a zero sum.

Sur la figure 3, sont illustrés schématiquement les aimants fixes 44A, 44B des deux haut-parleurs de grave 30A, 30B. Dans chaque haut-parleur, un piston 46A, 46B sur lequel est ménagé un bobinage est monté mobile en translation par rapport à chaque aimant 44A, 44B. Ce piston porte à son extrémité la membrane sphérique 32A, 32B.On the figure 3 , are schematically illustrated the fixed magnets 44A, 44B of the two woofers 30A, 30B. In each loudspeaker, a piston 46A, 46B on which a coil is provided is mounted movable in translation with respect to each magnet 44A, 44B. This piston carries at its end the spherical membrane 32A, 32B.

Avantageusement, la membrane est réalisée en métal, notamment en aluminium, magnésium, titane. Ainsi, la membrane est peu déformable. Elle est liée au châssis du haut-parleur par un dispositif d'étanchéité, par exemple un soufflet 48A, 48B. Selon des variantes, la membrane est réalisée en plastique, matériau composite, papier...Advantageously, the membrane is made of metal, in particular of aluminum, magnesium, titanium. Thus, the membrane is not very deformable. It is linked to the loudspeaker frame by a sealing device, for example a bellows 48A, 48B. According to variants, the membrane is made of plastic, composite material, paper, etc.

Les deux haut-parleurs de grave 30A, 30B sont conçus de sorte que le débattement axial maximal suivant l'axe Y-Y de la membrane de chaque haut-parleur de basse est supérieur à 1/50e du diamètre D de la zone sphérique 17 du caisson. Avantageusement, ce débattement est supérieur à 1/20e du diamètre D de la zone sphérique 17 et de manière encore plus préférentielle supérieur à 1/5e du diamètre D de la zone sphérique 17.The two woofers 30A, 30B are designed so that the maximum axial displacement along the YY axis of the membrane of each bass speaker is greater than 1/50 th of the diameter D of the spherical zone 17 of the box. Advantageously, this displacement is greater than 1/20 th of the diameter D of the spherical zone 17 and even more preferably greater than 1/5 th of the diameter D of the spherical zone 17.

L'enceinte 10 comporte en outre un haut-parleur 50, par exemple un haut-parleur de médium, disposé suivant l'axe X-X et débouchant dans la zone sphérique 17. Le haut-parleur 50 présente une membrane 52 formant une calotte sphérique incomplète ajourée à son sommet. Cette membrane sphérique 52 a un rayon égal au rayon de courbure de la zone sphérique 17 et s'étend dans le prolongement de cette région sphérique pour former une surface sphérique sensiblement continue lorsque la membrane 52 est au repos.The enclosure 10 further comprises a loudspeaker 50, for example a midrange loudspeaker, arranged along the axis XX and opening into the spherical zone 17. The loudspeaker 50 has a membrane 52 forming an incomplete spherical cap. openwork at its top. This spherical membrane 52 has a radius equal to the radius of curvature of the spherical zone 17 and extends in the extension of this spherical region to form a substantially continuous spherical surface when the membrane 52 is at rest.

Par haut-parleur de médium, on entend un haut-parleur adapté pour diffuser des ondes sonores de fréquences allant de 300 Hz à 3 kHz, voire de 150Hz à 6kHz.By midrange loudspeaker is meant a loudspeaker suitable for diffusing sound waves of frequencies ranging from 300 Hz to 3 kHz, or even from 150 Hz to 6 kHz.

De préférence, un haut-parleur d'aigu 60 est disposé axialement au centre du haut-parleur 50.Preferably, a tweeter 60 is disposed axially in the center of the speaker 50.

Par haut-parleur d'aigu, on entend un haut-parleur adapté pour diffuser des ondes sonores de fréquences allant de 3 kHz à 20 kHz, voire de 1kHz à 40kHz.By tweeter is meant a loudspeaker suitable for diffusing sound waves of frequencies ranging from 3 kHz to 20 kHz, or even from 1 kHz to 40 kHz.

Le haut-parleur d'aigu présente également une membrane sphérique de rayon égal au rayon de la zone sphérique 17 et s'inscrit dans l'enveloppe de la zone sphérique 17.The tweeter also has a spherical membrane with a radius equal to the radius of the spherical zone 17 and fits into the envelope of the spherical zone 17.

Grâce aux caractéristiques de l'enceinte 10 décrites ci-dessus, les membranes mobiles convexes des haut-parleurs épousent la forme du caisson de part et d'autre des intervalles séparant les membranes mobiles et le caisson. Ainsi, les phénomènes de diffraction sont très réduits.Thanks to the characteristics of the enclosure 10 described above, the convex mobile membranes of the loudspeakers follow the shape of the box on either side of the intervals separating the mobile membranes and the box. Thus, the diffraction phenomena are very reduced.

En outre, on conçoit qu'avec une telle enceinte, les haut-parleurs de grave placés dos à dos ont des déplacements identiques de leur membrane, les châssis des deux haut-parleurs restant immobiles par rapport au caisson, les forces de réaction appliquées par les membranes sur les châssis s'annulant.In addition, it can be seen that with such an enclosure, the bass speakers placed back to back have identical displacements of their membrane, the frames of the two speakers remaining stationary relative to the box, the reaction forces applied by the membranes on the frames canceling each other out.

En référence aux figures 6 et 7, on décrit une enceinte acoustique 110 qui ne fait pas partie de l'invention.With reference to figures 6 and 7 , there is described an acoustic enclosure 110 which does not form part of the invention.

L'enceinte 100 est analogue à l'enceinte 10 représentée sur les figures 1 à 5. Tout comme l'enceinte 10, l'enceinte 100 comprend un haut-parleur 30A ayant une première membrane mobile 32A convexe, la convexité étant tournée vers l'extérieur de l'enceinte, et un organe 12 entourant la première membrane mobile 32A et comportant une surface externe 12A. L'organe 12 est par exemple un caisson.The enclosure 100 is analogous to the enclosure 10 shown in the figures 1 to 5 . Like the enclosure 10, the enclosure 100 comprises a loudspeaker 30A having a first convex movable membrane 32A, the convexity being turned towards the outside of the enclosure, and a member 12 surrounding the first movable membrane 32A and comprising an outer surface 12A. The member 12 is for example a box.

Seules les différences avec l'enceinte 10 représentée sur les figures 1 à 5 seront décrites en détail ci-après.Only the differences with the enclosure 10 shown in the figures 1 to 5 will be described in detail below.

L'enceinte 100 est appliquée contre une paroi 110 définissant une surface plane 110A.The enclosure 100 is applied against a wall 110 defining a flat surface 110A.

La paroi 110 est par exemple un mur vertical, ou le dessus d'une table (non représentée).The wall 110 is for example a vertical wall, or the top of a table (not shown).

L'organe 12 comprend une portion périphérique 112 radialement distale par rapport à la membrane mobile 32A, et une portion interne 114 radialement proximale par rapport à la membrane mobile 32A.The member 12 comprises a peripheral portion 112 radially distal with respect to the mobile membrane 32A, and an internal portion 114 radially proximal with respect to the mobile membrane 32A.

La portion périphérique 112 est par exemple convexe. La portion périphérique 112 définit un bord périphérique B fermé. La portion périphérique 112 entoure la portion interne 114.The peripheral portion 112 is for example convex. The peripheral portion 112 defines a closed peripheral edge B. The peripheral portion 112 surrounds the internal portion 114.

La portion interne 114 est par exemple concave.The internal portion 114 is for example concave.

Entre la portion interne 114 et la portion périphérique 112 se trouve une zone d'inflexion S, qui est une ligne fermée dans l'exemple représenté.Between the internal portion 114 and the peripheral portion 112 is an inflection zone S, which is a closed line in the example shown.

L'organe 12 a une forme adaptée pour que, sur une portion continue B' du bord périphérique B représentant au moins 25%, de préférence au moins 50%, de manière encore plus préférentielle au moins 90%, de la longueur du bord périphérique B, pour tout point N de la portion continue B', la surface externe 12A de l'organe 12 possède au point N un troisième plan tangent PN.The member 12 has a shape adapted so that, on a continuous portion B 'of the peripheral edge B representing at least 25%, preferably at least 50%, even more preferably at least 90%, of the length of the peripheral edge B, for any point N of the continuous portion B ', the external surface 12A of the member 12 has at point N a third tangent plane P N.

Le troisième plan tangent PN et la surface plane 110A sont sensiblement confondus.The third tangent plane P N and the flat surface 110A are substantially the same.

Par « sensiblement confondus », on entend que le troisième plan tangent PN et le la surface plane 110A ne se distinguent pas sensiblement l'un de l'autre à l'œil humain. Par exemple :

  • d'une part, le point N se situe à une distance DN du troisième plan tangent PN inférieure à 1/100e du périmètre de la première membrane mobile 32A, préférentiellement à 1/200e du périmètre de la membrane mobile 32A, et encore plus préférentiellement à 1/400e. Par exemple, le point N se situe à une distance DN de la surface plane 110A inférieure à 5 mm, de préférence inférieure à 3 mm, de manière encore plus préférentielle inférieure à 1 mm, et
  • d'autre part, le troisième plan tangent PN et la surface plane 110A forment entre eux un angle αN inférieur à 10°, de préférence inférieur à 5°.
The term “substantially coincident” is understood to mean that the third tangent plane P N and the flat surface 110A are not significantly different from each other to the human eye. For example :
  • on the one hand, the point N is located at a distance D N from the third tangent plane P N less than 1/100 th from the perimeter of the first mobile membrane 32A, preferably at 1/200 th from the perimeter of the mobile membrane 32A, and even more preferably at 1/400 th . For example, the point N is located at a distance D N from the flat surface 110A of less than 5 mm, preferably less than 3 mm, even more preferably less than 1 mm, and
  • on the other hand, the third tangent plane P N and the flat surface 110A form between them an angle α N less than 10 °, preferably less than 5 °.

L'enceinte 100 permet de minimiser la diffraction et la réflexion liées à la présence de la paroi 110 à proximité immédiate de l'enceinte.The enclosure 100 makes it possible to minimize the diffraction and the reflection linked to the presence of the wall 110 in the immediate vicinity of the enclosure.

Claims (11)

  1. A loudspeaker enclosure (10) including:
    - a box (12) at least partially spherical and including a spherical zone (17),
    - a plurality of loudspeakers (30A, 30B) having convex mobile membranes (32A, 32B), the convex side being turned toward the outside of the enclosure (10), the loudspeakers (30A, 30B) being substantially identical and installed in a wall of the box, and
    - the box (12) surrounding each mobile membrane (32A, 32B) and including an outer surface (12A) bounded by an inner edge (Γ') situated facing each mobile membrane (32A, 32B),
    each mobile membrane (32A, 32B) including a peripheral edge (Γ) situated opposite the inner edge (Γ) of the box (12) and forming a closed loop,
    - over a continuous portion (Γ") of the peripheral edge (Γ) representing at least 25%, preferably at least 50%, still more preferably at least 90%, of the length of the peripheral edge (Γ), for any first point (M) of the continuous portion (Γ") and any second point (M') situated on the inner edge (Γ') at a location such that the distance between the first point (M) and the second point (M') is minimal, each membrane (32A, 32B) has, at the first point (M), a first tangent plane (PM), and the outer surface (12A) of the box (12) has, at the second point (M'), a second tangent plane (P'M), the first tangent plane (PM) and the second tangent plane (P'M) being substantially coincident with one another,
    - the mobile membranes (32A, 32B) are in the form of a solid spherical cap with the same curvature as the curvature of the spherical zone (17) of the box (12), the mobile membranes (32A, 32B) substantially extending the spherical zone (17) of the box (12) to form, in the idle position of the mobile membranes (32A, 32B), a substantially continuous spherical surface, and
    - the loudspeakers (30A, 30B) have stationary parts (42A, 42B) secured together rigidly, the loudspeakers (30A, 30B) being distributed angularly around a distribution axis (Z-Z) so as to successively form angles (γ) between them substantially equal to 360° divided by N, N being the number of loudspeakers (30A, 30B).
  2. The loudspeaker enclosure (10) according to claim 1, characterized in that the outer surface (12A) of the box (12) is configured so that, for any third point (M"') situated on the outer surface (12A) of the box (12) at a distance (DM"') from the continuous portion (Γ") smaller than or equal to 1/100th of the perimeter of each mobile membrane (32A, 32B), preferably smaller than or equal to 1/30th of the perimeter of each mobile membrane (32A, 32B), and still more preferably smaller than or equal to 1/10th of the perimeter of each mobile membrane (32A, 32B), any planar arc (Γ'") belonging to the outer surface (12A) and passing through the third point (M"') has, at the third point (M"'), a curve radius (RM"') greater than or equal to 1/100th of the perimeter of each mobile membrane (32A, 32B), preferably greater than or equal to 1/30th of the perimeter of each mobile membrane (32A, 32B), and still more preferably greater than or equal to 1/10th of the perimeter of each mobile membrane (32A, 32B).
  3. The loudspeaker enclosure (10) according to any one of claims 1 and 2, characterized in that the spherical zone (17) of the box (12) and the surface of the mobile membranes (32A, 32B) define a spherical surface with an expanse greater than the surface of revolution created by rotation of one of the mobile membranes (32A, 32B) of one of the loudspeakers (30A, 30B) over at least 180° around an axis (X-X) substantially perpendicular to the distribution axis (Z-Z).
  4. The loudspeaker enclosure (10) according to any one of claims 1 to 3, characterized in that an annular interval (34A, 34B) separates the periphery of the mobile membrane (32A, 32B) of each loudspeaker (30A, 30B) and the box (12), and in that the width (i) of this interval (34A, 34B) measured radially is less than 1/100th of the circumference of the mobile membranes (32A, 32B).
  5. The loudspeaker enclosure (10) according to any one of claims 1 to 4, characterized in that the diameter (d) of the circle defined by each mobile membrane (32A, 32B) is greater than half the diameter (D) of the spherical zone (17) of the box (12).
  6. The loudspeaker enclosure (10) according to any one of claims 1 to 5, characterized in that the maximum axial travel of the mobile membrane (32A, 32B) of each loudspeaker (30A, 30B) of said plurality is greater than 1/50th of the diameter (D) of the spherical zone (17) of the box (12).
  7. The loudspeaker enclosure (10) according to any one of claims 1 to 6, characterized in that the stationary parts (42A, 42B) of the loudspeakers (30A, 30B) of said plurality are rigidly connected to the box (12).
  8. The loudspeaker enclosure (10) according to any one of claims 1 to 7, characterized in that the spherical zone (17), in which the loudspeakers (30A, 30B) of said plurality are found, is extended by a protuberance (18) outwardly giving the box (12) an oblong general shape.
  9. The loudspeaker enclosure (10) according to any one of claims 1 to 8, characterized in that said plurality of loudspeakers (30A, 30B) consists of two loudspeakers.
  10. The loudspeaker enclosure (10) according to any one of claims 1 to 9, characterized in that it further comprises at least one first other loudspeaker (50) positioned across an opening of the box (12) and oriented along an axis (X-X) substantially perpendicular to the distribution axis (Z-Z), the first other loudspeaker (50) including a convex membrane (52) fitted into a sphere with the same curvature as the curvature of the spherical zone (17) of the box (12) and substantially extending the spherical zone (17) of the box (12) to form, in the idle position of the convex membrane (52), a substantially continuous spherical surface.
  11. The loudspeaker enclosure (10) according to claim 10, characterized in that it further comprises a second other loudspeaker (60) positioned at the center of the first other loudspeaker (50) and coaxial with the first other loudspeaker (50).
EP14783637.3A 2013-10-30 2014-10-13 Loudspeaker enclosure with at least one loudspeaker with a convex mobile membrane exhibiting continuity of shape with an adjacent member Active EP3063949B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1360616A FR3012716B1 (en) 2013-10-30 2013-10-30 ACOUSTIC SPEAKER HAVING AT LEAST ONE MOBILE CONVEX MEMBRANE SPEAKER IN CONTINUOUS FORM WITH AN ADJACENT BODY
PCT/EP2014/071842 WO2015062852A1 (en) 2013-10-30 2014-10-13 Loudspeaker enclosure with at least one loudspeaker with a convex mobile membrane exhibiting continuity of shape with an adjacent member

Publications (2)

Publication Number Publication Date
EP3063949A1 EP3063949A1 (en) 2016-09-07
EP3063949B1 true EP3063949B1 (en) 2020-07-29

Family

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Family Applications (1)

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EP14783637.3A Active EP3063949B1 (en) 2013-10-30 2014-10-13 Loudspeaker enclosure with at least one loudspeaker with a convex mobile membrane exhibiting continuity of shape with an adjacent member

Country Status (4)

Country Link
US (1) US10313783B2 (en)
EP (1) EP3063949B1 (en)
FR (1) FR3012716B1 (en)
WO (1) WO2015062852A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3087071B1 (en) * 2018-10-08 2020-11-06 Devialet ACOUSTIC LOUDSPEAKER CONTAINING A MONOBLOCK PLASTIC MATERIAL SHELL

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0926923A2 (en) * 1997-12-27 1999-06-30 Murata Manufacturing Co., Ltd. Multi-speaker apparatus
WO2008038021A1 (en) * 2006-09-29 2008-04-03 Martin Audio Limited Shaped loudspeaker

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3925626A (en) * 1974-02-22 1975-12-09 Jr Robert John Stallings Dynamic speaker having dome diaphragm and basket frequency
US4295006A (en) * 1978-04-24 1981-10-13 Victor Company Of Japan, Limited Speaker system
JP2001352592A (en) * 2000-06-08 2001-12-21 Fujitsu Ten Ltd Loudspeaker structure
DE10303030A1 (en) * 2003-01-25 2004-08-05 Norman Gerkinsmeyer driver
FR2895201A1 (en) * 2005-12-16 2007-06-22 Cabasse Sa Loudspeaker for e.g. home theater system, has block positioned ahead of concave membrane along traveling direction and restituting all spectra audible to human ear, where concave membrane restitutes low frequency band

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0926923A2 (en) * 1997-12-27 1999-06-30 Murata Manufacturing Co., Ltd. Multi-speaker apparatus
WO2008038021A1 (en) * 2006-09-29 2008-04-03 Martin Audio Limited Shaped loudspeaker

Also Published As

Publication number Publication date
US10313783B2 (en) 2019-06-04
FR3012716A1 (en) 2015-05-01
WO2015062852A1 (en) 2015-05-07
FR3012716B1 (en) 2016-07-01
EP3063949A1 (en) 2016-09-07
US20160360311A1 (en) 2016-12-08

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