(19)
(11)EP 3 513 572 B1

(12)EUROPEAN PATENT SPECIFICATION

(45)Mention of the grant of the patent:
09.09.2020 Bulletin 2020/37

(21)Application number: 17780016.6

(22)Date of filing:  13.09.2017
(51)International Patent Classification (IPC): 
B60R 11/00(2006.01)
H04R 1/28(2006.01)
B60R 5/04(2006.01)
H04R 1/02(2006.01)
B60R 11/02(2006.01)
(86)International application number:
PCT/EP2017/073059
(87)International publication number:
WO 2018/050718 (22.03.2018 Gazette  2018/12)

(54)

LOUDSPEAKER SYSTEM FOR VEHICLE.

LAUTSPRECHERSYSTEM FÜR EIN FAHRZEUG

SYSTÈME DE HAUT-PARLEUR POUR VÉHICULE


(84)Designated Contracting States:
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated Extension States:
BA ME
Designated Validation States:
MA MD

(30)Priority: 14.09.2016 IT 201600092741

(43)Date of publication of application:
24.07.2019 Bulletin 2019/30

(73)Proprietor: Ask Industries Societa' per Azioni
60037 Monte San Vito (AN) (IT)

(72)Inventors:
  • SERVADIO, Maurizio
    60037 Monte San Vito (AN) (IT)
  • PANNI, Claudio
    60037 Monte San Vito (AN) (IT)
  • MASSINI, Pietro
    60129 Ancona (IT)
  • ESPOSITO, Enrico
    60015 Falconara Marittima (AN) (IT)
  • COLONNA, Manrico
    60037 Monte San Vito (AN) (IT)

(74)Representative: Baldi, Claudio 
Ing. Claudio Baldi S.r.l. Viale Cavallotti, 13
60035 Jesi (Ancona)
60035 Jesi (Ancona) (IT)


(56)References cited: : 
EP-A2- 2 779 695
US-A1- 2013 142 380
FR-A1- 2 665 996
US-B1- 6 338 395
  
      
    Note: Within nine months from the publication of the mention of the grant of the European patent, any person may give notice to the European Patent Office of opposition to the European patent granted. Notice of opposition shall be filed in a written reasoned statement. It shall not be deemed to have been filed until the opposition fee has been paid. (Art. 99(1) European Patent Convention).


    Description


    [0001] The present patent application for industrial invention relates to a loudspeaker system for vehicle.

    [0002] As it is known, a speaker system comprises a loudspeaker and a compartment, generally known as "box". The speaker comprises a basket, a membrane, a magnetic unit, a voice coil and elastic centering and suspension means (centering device and edge).

    [0003] The magnetic unit generates a static magnetic field. Electrical current circulates in the coil. By interacting with the electrical current that circulates in the coil, the static magnetic field caused by the magnetic unit generates a force on the coil that puts the membrane in vibration and the membrane generates a sound.

    [0004] The main function of the box is to eliminate the so-called "acoustic short circuit" that reduces the sound pressure level (SPL). The lower the frequency of the sound emitted by the loudspeaker, the higher such a reduction will be.

    [0005] Boxes with volumes from 2 to 50 liters are typically used for the interior of vehicles. Normally, in order to tune the project of the speaker system, the volume of the box and the construction parameters of the loudspeaker are modified. The higher the volume of the box, the better the performance of the loudspeaker at low frequencies will be. Both the frequency extension and the transient response can be modified by changing the construction parameters of the loudspeaker.

    [0006] Applications of loudspeakers to vehicles are known, which use volumes obtained in the vehicle as boxes of the loudspeaker.

    [0007] EP0904985 discloses a loudspeaker disposed in a compartment under the passenger seat. Such a loudspeaker uses the interior of the vehicle as box.

    [0008] WO2007/036245 discloses a loudspeaker disposed in a specific position of the vehicle in such a way to use two internally empty elements of the vehicle that meet one another, in such a way to form two resonance chambers that are coupled together.

    [0009] WO2011/047435 discloses a loudspeaker assembly that provides for a loudspeaker mounted in a wall of a vehicle. The loudspeaker assembly has a Helmholtz resonator that comprises a chamber in communication with a vent duct. The volume of the chamber of the Helmholtz resonator is smaller than the volume of the loudspeaker driver to provide a system frequency that is higher than the operation band of the loudspeaker driver.

    [0010] EP2620328 discloses a system comprising: a loudspeaker installed in the trunk of a vehicle, a sound guide port that sends the sound in the interior of the vehicle and an air vent port that ends in front of the water box of the vehicle.

    [0011] Documents EP0904985 and WO2007/036245 have some limitations in the tuning of the frequency response of the loudspeaker system.

    [0012] Documents WO2011/047435 and EP2620328 are impaired by some drawbacks caused by the structural complexity of the ducts connected to chambers obtained in the loudspeaker to generate the Helmholtz resonators.

    [0013] EP2779695 discloses a wall of a vehicle that separates the interior from the exterior (infinite baffle type). The loudspeaker comprises a hermetically closed basket (without openings). A box is composed of the basket and of a duct in communication with a hole of the wall. In such a way a back chamber is formed between the membrane of the loudspeaker and the box. The magnetic unit is outside the box. Such a solution is impaired by drawbacks related with volume, compact design and versatility. In fact, the magnetic unit is outside the box and the basket of the loudspeaker must be hermetically closed, thus excluding the use of open standard baskets. The provision of the air vent port in the proximity of the membrane increases the instability of the mobile coil. In fact, such a port is an asymmetric acoustic load, and causes a deviation from the axial movement of the mobile coil. This increases the risk for the mobile coil to hit the polar extensions of the magnetic circuit, causing undesired noise.

    [0014] US6338395 discloses a loudspeaker disposed in a box filled with sound-absorbing material. Such a document doesn't teach to couple the box to a wall of a vehicle that forms an infinite baffle; likewise, it doesn't teach to position the sound-absorbing material only in the outlet hole of the box.

    [0015] FR 2 665 996 A1 discloses an accessory for car audio including a loudspeaker for the purpose of enhancing the acoustics, which is mounted on a cover plate in the car compartment. The metal car body facing the loudspeaker is covered with a material which is not affected by water, and sticks to the metal surface. The back surface of this acoustic material diffuses the sound waves emanating from the rear surface of the cone of the loudspeaker whilst the front surface absorbs and deadens the acoustic waves.

    [0016] The purpose of the present invention is to eliminate the drawbacks of the prior art by disclosing a loudspeaker system for vehicle that is effective, efficacious, reliable, accurate and simple to make and install.

    [0017] These purposes are achieved according to the invention with the characteristics of independent claim 1.

    [0018] Advantageous embodiments of the invention appear from the dependent claims.

    [0019] The fact that the basket and the magnetic unit are disposed inside the box makes the loudspeaker more compact and capable of being easily and rapidly fixed to the wall of the frame of the vehicle. The basket of the loudspeaker is a traditional basket that is open to let air pass in the back resonance chamber. Moreover, the fact that the basket and the magnetic unit are disposed inside the box permits to better contrast the noise caused by the air turbulence when the membrane makes its maximum travel.

    [0020] The sound-absorbing material is disposed only in the outlet hole of the box because such a position has the highest air speed and the best results are obtained, without having to entirely fill the box with sound-absorbing material, and avoiding the waste of said material. Moreover, the mechanical damping factor of the loudspeaker is modified considerably by placing the sound-absorbing material only in the outlet hole of the box.

    [0021] Additional features of the invention will appear clearer from the detailed description below, which refers to merely illustrative, not limiting embodiments, wherein:

    Fig. 1 is a sectional view of the loudspeaker system for vehicle according to the invention;

    Fig. 2 is a partially cut and interrupted side view of a vehicle and of the loudspeaker system of Fig. 1 installed in an upper part of a trunk of the vehicle;

    Fig. 3 is a partially cut rear view of the vehicle of Fig. 2;

    Fig. 4 is a partially cut rear view of a vehicle and of the loudspeaker system of Fig. 1 installed in a lower part of a trunk of the vehicle under a spare tire;

    Fig. 5 is a partially cut rear view of a vehicle and of the loudspeaker system of Fig. 1 installed in a side part of the vehicle;

    Fig. 6 is a sectional view of a variant of the loudspeaker system of Fig. 1;

    Fig. 7 is a partially cut top view of the loudspeaker system of Fig. 6;

    Fig. 8 is a plan view of a variant of the loudspeaker system of Fig. 6;

    Fig. 9 is a front view of the box of the loudspeaker system of Fig. 8;

    Fig. 10 is a side view of the box of the loudspeaker system of Fig. 8;

    Fig. 11 is an axial view of a variant of the loudspeaker system according to the invention.



    [0022] With reference to the Figures, the loudspeaker system of the invention is described, which is generally indicated with reference numeral 100.

    [0023] With reference to Fig. 1, the system (100) comprises a wall (1) of a frame of a vehicle that separates an exterior from an interior of the vehicle. The interior of the vehicle can be the driver and passenger compartment or a compartment of the vehicle in communication with the driver and passenger compartment of the vehicle or adjacent to it. The wall (1) of the frame of the vehicle has a through hole (10).

    [0024] A box (2) is mounted in the wall (1) in correspondence of the through hole (10) of the wall. The box (2) is facing inwards. A loudspeaker (L) is mounted in the box (2). The box (2) coupled with the wall (1) of the vehicle forms a loudspeaker system of infinite baffle type.

    [0025] The box (2) comprises a bottom wall (20), an upper wall (21) and lateral walls (22) that connect the bottom wall (20) to the upper wall (21).

    [0026] The upper wall (21) is provided with an opening (23) intended to receive the loudspeaker (L).

    [0027] The loudspeaker (L) comprises a basket (3) provided with a lower wall (30) that radially protrudes towards the interior of the basket, an upper wall (31) that radially protrudes towards the exterior of the basket and a lateral wall (32) that connects the lower wall to the upper wall. The basket (3) substantially has a truncated-conical shape with increasing diameter going from the lower wall to the upper wall. The lateral wall (32) of the basket is provided with openings to let air pass through. The basket (3) is an open basket of standard type that is commonly used in loudspeakers.

    [0028] The upper wall (31) of the basket is fixed to the upper wall (21) of the box, in such a way that the basket passes through the opening (23) of the box and is contained in the box.

    [0029] A magnetic unit (4) is fixed to the basket (3). The magnetic unit (4) comprises:
    • a lower polar plate (40) (T-Yoke), with T-shaped cross-section, comprising a cylindrical core (41) that protrudes axially from the plate,
    • a permanent magnet (42) with toroidal shape, disposed on the lower polar plate, around a cylindrical core (41), and
    • an upper polar plate (43), with toroidal shape, disposed on the permanent magnet (42).


    [0030] In view of the above, an air gap (T) is formed between the upper polar plate (43) and the core (41).

    [0031] A coil (5) is supported by a cylinder (50).

    [0032] A centering device (6), which is composed of elastic corrugations, is fixed to the basket (3) and to the cylinder (50) of the coil, in such a way to center and support the coil (5) in the air gap (T).

    [0033] A truncated-conical membrane (7) is centrally fixed to the cylinder (50) of the coil.

    [0034] An edge (60), in the form of an elastic suspension, is peripherally fixed to the membrane (7) and to the upper wall (31) of the basket, in such a way that the membrane (7) has a truncated-conical shape with increasing diameter going from the cylinder of the coil towards the upper wall of the basket.

    [0035] A covering element (61), which is known as "dustcap", is centrally disposed on the membrane (7) in such a way to cover the cylinder of the coil.

    [0036] The loudspeaker (L) has an axis (Y) that coincides with the axis of the cylinder (50).

    [0037] When the static magnetic field in the air gap (T), which is generated by the magnetic unit (4), interacts with the electrical current that flows in the coil (5), a force is generated on the coil. Such a force axially moves the cylinder (50) of the coil and makes the membrane (7) vibrate, with consequent sound emission.

    [0038] In the embodiment of Fig. 1, the bottom wall (20) of the box is fixed to the wall (1) of the frame of the vehicle. The lower wall (20) has a hole (27) with a substantially circular shape.

    [0039] A back resonance chamber (C1) is formed in the box (2), being defined by the walls of the box, by the membrane (7) and by the edge (60). Such a back resonance chamber (C1) is in communication with the exterior by means of the hole (27) obtained in the lower wall of the box. Therefore the back resonance chamber (C1) and the hole (27) act as Helmholtz's resonator.

    [0040] Both the basket (5) and the magnetic unit (4) are disposed inside the box (2) and contained inside the back resonance chamber (C1). The basket (3) must be open to let air pass through.

    [0041] Nevertheless, it must be considered that the volume of the back resonance chamber (C1) is larger than a front volume (C2) formed by the truncated-conical volume of the membrane (7).

    [0042] In order to obtain a frequency band with a higher low frequency width compared to the frequency band of the loudspeaker mounted in a closed box with typical volume, the hole (27) of the flange of the box is provided with a partition (8) with variable thickness made of sound-absorbing material, such as for example agglomerates of natural fibers, synthetic fibers or open-cell foam.

    [0043] The main function of the partition (8) is to modify the frequency response and the transient response of the loudspeaker system by acoustic power dissipation in function of frequency. Said frequency responses are controlled by changing the geometry and the material of the partition (8).

    [0044] The additional and necessary function of the partition (8) is to protect the loudspeaker against weather agents and the intrusion of foreign matter (dust, sand, stones, etc.). The partition (8) has a thickness comprised between 0.1 and 40 mm.

    [0045] In Fig. 1 the hole (27) has an axis that coincides with the axis (Y) of the loudspeaker. Nevertheless, the hole (27) may have an axis that does not coincide with the axis (Y) of the loudspeaker.

    [0046] Figs. 2 and 3 show an embodiment wherein the system (100) is mounted in an upper part of a trunk (B) of a vehicle. In such a case, the wall (1) of the vehicle where the box (2) is mounted is a wall disposed in the upper part of the trunk (B) of the vehicle. The box (2) is mounted on a substantially horizontal wall (1) and consequently the axis of the loudspeaker is substantially vertical.

    [0047] Fig. 4 shows an embodiment wherein the system (100) is mounted in a lower part of a trunk (B) of a vehicle, where a spare tire (S) is generally positioned. In such a case the wall (1) of the vehicle where the box (2) is mounted is a bottom wall of the trunk (B) of the vehicle and the box (2) is disposed between the bottom wall (11) of the trunk and the hub (H) of the spare tire.

    [0048] Fig. 5 shows an embodiment wherein the system (100) is mounted in a wall (1) of the vehicle, near a fender (P) of the vehicle. In such a case, the box (2) is mounted on a substantially vertical wall (1) and consequently the axis of the loudspeaker is substantially horizontal.

    [0049] In the following description the parts that are identical or corresponding to the parts described above are identified with the same numerals, omitting their detailed description.

    [0050] Figs. 6 and 7 show a variant of the system (100), wherein the hole (27) that receives the partition (8) of sound-absorbing material is disposed in a lateral wall (22) of the box.

    [0051] In such a case, the hole (27) of the box has an axis (X) orthogonal to the axis (Y) of the loudspeaker (L) and substantially passing through the end of the core (41) of the magnetic unit.

    [0052] Figs. 8 and 10 show a variant of the system (100), wherein the hole (27) that receives the partition (8) of sound-absorbing material is disposed in a duct (25) that protrudes laterally from a lateral wall (22) of the box. The hole (27) has a rectangular shape. The duct (25) ends with a flange (26) that is fixed to the wall (1) of the frame of the vehicle. A grill (29) is disposed on the front wall of the box, in such a way to cover the loudspeaker (L) disposed in the box.

    [0053] Although not shown in the figures, the front wall (21) of the box may be sufficiently large with respect to the loudspeaker (L). In such a case the hole (27) that receives the partition (8) may be obtained in the front wall (21) of the box.

    [0054] Fig. 11 shows a variant of the system (100), wherein the back wall (20) of the box is not directly fixed to the wall (1) of the frame. In fact, a connection pipe or duct (25) protrudes in the back from the back wall (20) of the box, around the hole (27) that receives the partition (8) for fixing to the wall (1) of the frame. In such a case, the duct (25) has a flange (26) for fixing to the wall of the frame.


    Claims

    1. Loudspeaker system (100) for vehicle comprising:

    - a wall (1) of a frame of a vehicle that separates an exterior from an interior; said wall (1) having a through hole (10),

    - a box (2) mounted in the wall (1) of the frame in correspondence with the through hole (10) of said wall (1) of the frame of the vehicle;

    - a loudspeaker (L) mounted in the box (2); said loudspeaker (L) comprising: a basket (3) fixed to the box, a magnetic unit (4) fixed to the basket, a coil (5) supported by a cylinder (50) connected to a membrane (7) and centering devices (6, 60) that connect the cylinder (50) to the basket and the membrane (7) to the basket,

    - a back resonance chamber (C1) formed between said membrane (7) of the loudspeaker and the walls of the box (2),

    - a through hole (27) formed in a wall (20, 21, 22) of the box and disposed in line with said hole (10) of the wall (1) of the frame of the vehicle; said through hole (27) of the wall (20, 21, 22) of the box being in communication with said back resonance chamber (C1), forming a loudspeaker system of infinite baffle type;

    characterized in that
    said basket (3) and said magnetic unit are disposed inside the box (2) and in said back resonance chamber (C1),
    said basket (3) is open and is provided with openings intended to let air pass in said back resonance chamber (C1),
    a partition (8) of sound-absorbing material is provided and fills only said through hole (27) of the wall (20, 21, 22) of the box;
    wherein said partition (8) has a thickness comprised between 0.1 and 40 mm.
     
    2. The system (100) of claim 1, wherein said partition (8) is made of an agglomerate of natural fibers, synthetic fibers and/or open-cell foams.
     
    3. The system (100) of any one of the preceding claims, wherein said membrane (7) of the loudspeaker has a truncated-conical shape and defines a front truncated-conical volume (C2), wherein the volume of said back resonance chamber (C1) is higher than said front volume (C2).
     
    4. The system (100) of any one of the preceding claims, wherein
    said basket (3) of the loudspeaker is fixed to a front wall (21) of the box; and
    said through hole (27) of the box is formed in a back wall (20) of the box.
     
    5. The system (100) of claim 4, wherein said through hole (27) of the back wall (20) of the box has an axis that coincides with the axis (Y) of the loudspeaker.
     
    6. The system (100) of any one of claims 1 to 3, wherein
    said basket (3) of the loudspeaker is fixed to a front wall (21) of the box;
    said through hole (27) of the box is obtained in a lateral wall (22) of the box;
    said through hole (27) of the lateral wall (22) of the box has an axis (X) orthogonal to the axis (Y) of the loudspeaker.
     
    7. The system (100) of any one of claims 1 to 3, wherein
    said basket (3) of the loudspeaker is fixed to a front wall (21) of the box; and
    said through hole (27) of the box is formed in said front wall (21) of the box.
     
    8. The system (100) of any one of the preceding claims, comprising a connection pipe or duct (25) that externally protrudes from the wall (20, 21, 22) of the box, around the through hole (27) that receives the partition (8) for fixing to the wall (1) of the frame.
     


    Ansprüche

    1. Lautsprechersystem (100) für Fahrzeuge, umfassend:

    - eine Wand (1) eines Fahrzeugrahmens, die ein Äußeres von einem Inneren trennt; wobei die Wand (1) ein Durchgangsloch (10) aufweist,

    - ein Gehäuse, (2), das in der Wand (1) des Rahmens an dem Durchgangsloch (10) der Wand (1) des Fahrzeugrahmens eingebaut ist;

    - einen Lautsprecher (L), der in dem Gehäuse (2) eingebaut ist; wobei der Lautsprecher (L) umfasst:

    - einen an dem Gehäuse befestigten Korb (3), eine an dem Korb befestigte Magneteinheit (4), eine Spule (5), die von einem Zylinder (50) getragen ist, der mit einer Membran (7) verbunden ist, und Zentriereinrichtungen (6, 60), die den Zylinder (50) mit dem Korb und die Membran (7) mit dem Korb verbinden,

    - einen hinteren Resonanzraum (C1), der zwischen der Membran (7) des Lautsprechers und den Wänden des Gehäuses (2) gebildet ist,

    - ein Durchgangsloch (27), das in einer Wand (20, 21, 22) des Gehäuses gebildet und auf das Loch (10) der Wand (1) des Fahrzeugrahmens ausgerichtet ist; wobei das Durchgangsloch (27) der Wand (20, 21, 22) des Gehäuses mit dem hinteren Resonanzraum (C1) in Verbindung steht und ein Lautsprechersystem vom Typ "unendliche Schallwand" bildet;

    dadurch gekennzeichnet, dass
    der Korb (3) und die Magneteinheit in dem Gehäuse (2) und in dem hinteren Resonanzraum (C1) angeordnet sind,
    der Korb (3) offen ist und mit Öffnungen versehen ist, die dazu geeignet sind, Luft in den hinteren Resonanzraum (C1) passieren zu lassen,
    eine Scheidewand (8) aus schalldämpfendem Material angeordnet ist und nur das Durchgangsloch (27) der Wand (20, 21, 22) des Gehäuses ausfüllt;
    wobei die Scheidewand (8) eine Dicke zwischen 0,1 und 40 mm aufweist.
     
    2. System (100) nach Anspruch 1, wobei die Scheidewand (8) aus einem Agglomerat aus Naturfasern, Kunstfasern und/oder offenzelligen Schaumstoffen hergestellt ist.
     
    3. System (100) nach einem der vorstehenden Ansprüche, wobei die Membran (7) des Laufsprechers eine kegelstumpfförmige Gestalt aufweist und ein vorderes kegelstumpfförmiges Volumen (C2) definiert, wobei das Volumen des hinteren Resonanzraums (C1) größer als das vordere Volumen (C2) ist.
     
    4. System (100) nach einem der vorstehenden Ansprüche, wobei
    der Korb (3) des Lautsprechers an einer vorderen Wand (21) des Gehäuses befestigt ist; und
    das Durchgangsloch (27) des Gehäuses in einer hinteren Wand (20) des Gehäuses gebildet ist.
     
    5. System (100) nach Anspruch 4, wobei das Durchgangsloch (27) der hinteren Wand (20) des Gehäuses eine mit der Achse (Y) des Lautsprechers zusammenfallende Achse aufweist.
     
    6. System (100) nach einem der Ansprüche 1 bis 3, wobei
    der Korb (3) des Lautsprechers an einer vorderen Wand (21) des Gehäuses befestigt ist;
    das Durchgangsloch (27) des Gehäuses in einer Seitenwand (22) des Gehäuses herausgearbeitet ist;
    das Durchgangsloch (27) der Seitenwand (22) des Gehäuses eine Achse (X) aufweist, die rechtwinklig zur Achse (Y) des Lautsprechers ist.
     
    7. System (100) nach einem der Ansprüche 1 bis 3, wobei
    der Korb (3) des Lautsprechers an einer vorderen Wand (21) des Gehäuses befestigt ist; und
    das Durchgangsloch (27) des Gehäuses in der vorderen Wand (21) des Gehäuses gebildet ist.
     
    8. System (100) nach einem der vorstehenden Ansprüche, umfassend ein Verbindungsrohr oder einen -kanal (25), der aus der Wand (20, 21. 22) des Gehäuses rund um das Durchgangsloch (27) hervorsteht, das die Scheidewand (8) zur Befestigung der Wand (1) des Rahmens aufnimmt.
     


    Revendications

    1. Système (100) de haut-parleur pour véhicule comprenant :

    - une cloison (1) d'un châssis d'un véhicule qui sépare un extérieur d'un intérieur ; ladite cloison (1) ayant un orifice passant (10),

    - un boîtier (2) monté dans la cloison (1) du châssis en correspondance de l'orifice passant (10) de ladite cloison (1) du châssis du véhicule ;

    - un haut-parleur (L) monté dans le boîtier (2) ; ledit haut-parleur (L) comprenant :

    - un panier (3) fixé au boîtier, un groupe aimanté (4) fixé au panier, une bobine (5) soutenue par un cylindre (50) relié à une membrane (7) et des moyens de centrage (6, 60) qui relient le cylindre (50) au panier et la membrane (70) au panier,

    - une chambre postérieure de résonance (C1) formée entre ladite membrane (7) du haut-parleur et les parois du boîtier (2),

    - un orifice passant (27) réalisé dans une paroi (20, 21, 22) du boîtier et disposé en ligne avec ledit orifice (10) de la cloison (1) du châssis du véhicule ; ledit orifice passant (27) de la paroi (20, 21, 22) du boîtier étant en communication avec ladite chambre postérieure de résonance (C1), en formant un système de haut-parleur du type à baffle infini ;

    caractérisé en ce que
    ledit panier (3) et ledit groupe aimanté sont disposés dans le boîtier (2), dans ladite chambre postérieure de résonance (C1),
    ledit panier (3) est ouvert et présente des ouvertures aptes à faire passer de l'air dans ladite chambre postérieure de résonance (C1),
    un segment de partage (8) en matériel phono-absorbant est disposé et remplit uniquement ledit orifice passant (27) de la paroi (20, 21, 22) du boitier ;
    où ledit segment de partage (8) a une épaisseur comprise entre 0,1-40 mm.
     
    2. Système (100) selon la revendication 1, où ledit segment de partage (8) est réalisé en un aggloméré de fibres naturelles, fibres synthétiques et/ou mousses à cellules ouvertes.
     
    3. Système (100) selon l'une quelconque des revendications précédentes, où ladite membrane (7) du haut-parleur a une forme tronconique et définit un volume antérieur (C2) de forme tronconique, où ladite chambre postérieure de résonance (C1) a un volume majeur par rapport au dit volume antérieur (C2).
     
    4. Système (100) selon l'une quelconque des revendications précédentes, où
    ledit panier (3) du haut-parleur est fixé à une paroi antérieure (21) du boîtier ; et
    ledit orifice passant (27) du boîtier est réalisé dans une paroi postérieure (20) du boîtier.
     
    5. Système (100) selon la revendication 4, où ledit orifice passant (27) de la paroi postérieure (20) du boîtier a un axe qui coïncide avec l'axe (Y) du haut-parleur.
     
    6. Système (100) selon l'une quelconque des revendications de 1 à 3, où
    ledit panier (3) du haut-parleur est fixé à une paroi antérieure (21) du boîtier ;
    ledit orifice passant (27) du boîtier est réalisé dans une paroi latérale (22) du boîtier ;
    ledit orifice passant (27) de la paroi latérale (22) du boîtier a un axe (X) orthogonal à l'axe (Y) du haut-parleur.
     
    7. Système (100) selon l'une quelconque des revendications de 1 à 3, où
    ledit panier (3) du haut-parleur est fixé à une paroi antérieure (21) du boîtier ; et
    ledit orifice passant (27) du boîtier est réalisé dans ladite paroi antérieure (21) du boîtier.
     
    8. Système (100) selon l'une quelconque des revendications précédentes comprenant un tuyau ou conduit de raccord (25) qui fait saillie à l'extérieur de la paroi (20, 21, 22) du boîtier, autour de l'orifice passant (27) qui accueille le segment de partage (8), pour se fixer à la cloison (1) du châssis.
     




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    Cited references

    REFERENCES CITED IN THE DESCRIPTION



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    Patent documents cited in the description