EP3892010A1 - Stiffening part for an audio speaker casing - Google Patents

Stiffening part for an audio speaker casing

Info

Publication number
EP3892010A1
EP3892010A1 EP19802179.2A EP19802179A EP3892010A1 EP 3892010 A1 EP3892010 A1 EP 3892010A1 EP 19802179 A EP19802179 A EP 19802179A EP 3892010 A1 EP3892010 A1 EP 3892010A1
Authority
EP
European Patent Office
Prior art keywords
face
loudspeaker
box
stiffening
enclosure
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.)
Pending
Application number
EP19802179.2A
Other languages
German (de)
French (fr)
Inventor
Hugo CHUSSEAU
Gilles Bourgoin
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sagemcom Broadband SAS
Original Assignee
Sagemcom Broadband SAS
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sagemcom Broadband SAS filed Critical Sagemcom Broadband SAS
Publication of EP3892010A1 publication Critical patent/EP3892010A1/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • 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
    • H04R1/2803—Transducer mountings or enclosures modified by provision of mechanical or acoustic impedances, e.g. resonator, damping means 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
    • 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
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/02—Casings; Cabinets ; Supports therefor; Mountings therein
    • H04R1/025—Arrangements for fixing loudspeaker transducers, e.g. in a box, furniture
    • 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
    • H04R1/2873—Reduction of undesired resonances, i.e. standing waves within enclosure, or of undesired vibrations, i.e. of the enclosure itself for loudspeaker transducers

Definitions

  • the invention relates to the field of stiffening parts for an acoustic enclosure.
  • An acoustic enclosure comprises a box and one or more speakers.
  • One or more faces of the box include one or more openings each intended to accommodate a speaker.
  • the movement of the loudspeaker membranes is the source of vibrations which produce unwanted noise.
  • an enclosure of the prior art 1 comprises a box 2 having an upper face, a lower face and lateral faces.
  • the enclosure further comprises a first speaker 3a mounted on the upper face and a second speaker 3b mounted on the underside of the box 2.
  • the operation of the speakers 3 excites three modes of vibration of the enclosure 1 .
  • a first vibration mode results from a pumping movement of the magnets 4 of the loudspeakers 3.
  • the magnet 4 of each loudspeaker 3 undergoes a translational movement along the translation axis XI (see FIG. 1) which is a longitudinal axis of the enclosure 1.
  • This translational movement is due to the relatively large mass of the magnet 4 and to the relative flexibility of the sheet 5 of the loudspeaker 3 called “salad bowl", in which the membrane (not shown).
  • the translational movement occurs in the operating direction of the diaphragm of the speaker 3.
  • a second mode of vibration results from a pendulum movement of the magnets 4 of the loudspeakers 3.
  • the magnet 4 of each loudspeaker 3 undergoes a rotational movement around a pendulum axis X2 which passes through the center of the membrane and which is perpendicular to the longitudinal axis of the speaker 3 (see Figure 2).
  • This rotational movement is also due to the relatively large mass of the magnet 4 and the relative flexibility of the sheet metal of the loudspeaker 3.
  • a third mode of vibration results from a deformation of the box 2 of the enclosure 1, which "swells" due to the increase in internal pressure induced by the displacement of the membranes of the speakers 3.
  • the object of the invention is to reduce the vibrations and therefore the parasitic noise of an acoustic enclosure.
  • a stiffening piece which is designed to be integrated inside a box of an acoustic enclosure in order to stiffen said box, the acoustic enclosure possibly further comprising at least one loudspeaker.
  • speaker mounted on a first face of the box, the stiffening part comprising a connecting portion, at least one damping support defining a reception space arranged to receive a damping device intended to limit vibrations of the loudspeaker, the damping support comprising a plurality of ribs distributed around the reception space, each rib extending in a separate plane parallel to a depth of the reception space, the stiffening part being arranged so that , when the enclosure is assembled, the connecting portion interconnects internal walls of a second face of the box and a third face of the box opposite to each other and all of them perpendicular to the first face, the damping device is positioned in the reception space, and a rear part of the loudspeaker comes to bear against the damping device.
  • the connecting portion which connects the second face and the third face of the box, the ribs and the damping device positioned in the reception space make it possible to limit the vibrations which have just been mentioned. Thanks to the stiffening part according to the invention, the three main resonant frequencies of the enclosure are moved outside the range of use of the loudspeaker, and the parasitic noise is reduced very significantly.
  • An enclosure comprising a box, a loudspeaker, the stiffening part which has just been described, and a damping device.
  • Figure 1 is a perspective view of a box and two speakers of an enclosure according to the prior art, the view being cut in a plane parallel to a longitudinal axis of the enclosure;
  • Figure 2 is a view similar to that of Figure 1, one of the two speakers undergoing a pendulum movement;
  • Figure 3 is a perspective view of an enclosure comprising a box, two speakers, two damping devices, and a stiffening part according to the invention
  • Figure 4 is a view similar to that of Figure 3, the view being cut in a plane parallel to a longitudinal axis of the enclosure;
  • Figure 5 is a perspective view of the stiffening part according to the invention.
  • Figure 6 is a perspective view of a damping device.
  • the invention is here implemented in an acoustic enclosure 11 which is in this case a connected enclosure.
  • the enclosure 11 firstly comprises a box 12 and a plurality of speakers.
  • the box 12 has a generally parallelepiped exterior shape.
  • the box 12 comprises an upper face, here called first face 14, four side faces, among which there are two opposite faces (that is to say located one opposite the other) called here second face 15 and third face 16, and a lower face, here called fourth face 17.
  • first face 14 and the fourth face 17 are two opposite faces which are both perpendicular to the second face 15 and to the third face 16.
  • the axis X3 which passes through the center of the first face 14 and the fourth face 17 is called here "longitudinal axis of the box".
  • the plurality of speakers includes a first speaker 18a and a second speaker 18b, as well as other speakers which will not be described here.
  • the first loudspeaker 18a and the second loudspeaker 18b here each comprise a membrane 19, a sheet 20 called a "bowl” in which the membrane 19 extends, a coil and a magnet 21.
  • Each magnet 21 has here a shape frusto-conical, the radius of which decreases towards the rear of the loudspeaker 18.
  • the term “front part” of each loudspeaker 18 is used here to refer to the part which comprises the membrane 19, and “rear part” to the side part opposite the membrane 19. The rear part therefore here comprises the magnet 21.
  • longitudinal axis of the loudspeaker X4 is the axis of revolution of the magnet 21, which also passes through the center of the membrane 19 , and the height of the loudspeaker 18 is called “height” of the loudspeaker 18 along its longitudinal axis X4.
  • the first speaker 18a is mounted on the first face 14 of the box 12.
  • the first speaker 18a is fixed to the first face 14, the longitudinal axis X4 of the first speaker 18a being perpendicular to the first face 14.
  • the first face 14 has an opening whose shape coincides with the circumference of the large diameter of the membrane 19 of the first loudspeaker 18a and into which the membrane 19 opens.
  • the second loudspeaker 18b is mounted in the same way on the fourth face 17 of the box 12.
  • the first loudspeaker 18a and the second loudspeaker 18b are therefore mounted head to tail in the casing 12, and their longitudinal axes X4 are merged.
  • the longitudinal axes X4 of the first loudspeaker 18a and of the second loudspeaker 18b are parallel with the longitudinal axis X3 of the box 12.
  • the enclosure also comprises a stiffening part 25 integrated inside the box 12.
  • the stiffening part 25 is positioned between the first loudspeaker 18a and the second loudspeaker 18b,
  • the stiffening part 25 is made of a thermoplastic material.
  • the stiffening part 25 firstly comprises a connecting portion 26 (which could also be called “beam”).
  • the connecting portion 26 interconnects the internal wall of the second face 15 and the internal wall of the third face 16.
  • the connecting portion 26 extends in length along a connecting axis X5 which, when the stiffening piece 25 is positioned in the box 12, is parallel to a transverse axis of the box 12 and is orthogonal to 1 axis longitudinal X3 of the box 12.
  • the connecting portion therefore extends parallel to the first face 14 and to the fourth face 17 of the box 12.
  • connection portion 26 here comprises a first end 27 and a second end 28 each provided with means for fixing to one face of the box 12, in this case here a thread 29.
  • the first end 27 of the connection portion 26 is fixed by screwing to the second face 15 of the box 12, while the second end 28 of the connecting portion 26 is fixed by screwing to the third face 16 of the box 12.
  • a first screw 38 (visible in FIG. 4) s 'thus extends through the second face 15 to be screwed into the thread 29 of the first end 27, and a second screw 38 extends through the third face 16 to be screwed into the thread 29 of the second end 28 of the connecting portion 26.
  • the stiffening part 25 further comprises a first damping support 30a and a second damping support 30b.
  • the first damping support 30a and the second damping support 30b are located at a central part of the connecting portion 26.
  • the first damping support 30a defines a reception space 31 having a general shape of revolution, in this case a frustoconical shape.
  • the axis of revolution X6 of the reception space 31 is orthogonal to the connection axis X5 of the connection portion 26.
  • the radius of the reception space 31 is reduced to the level a bottom 32 of the reception space 31, and increases until the main opening of the reception space 31, which extends opposite the bottom 32 of the reception space 31.
  • the first damping support 30a comprises ribs 34 which are distributed, with a different orientation, around the reception space 31.
  • the ribs 34 each have the shape of a fin.
  • the ribs 34 extend radially around the reception space 31 from the circumference of the reception space 31.
  • the length of each rib is parallel to the axis of revolution X6 of the reception space 31
  • the width of each rib 34 is defined in the extension of the radius of the reception space 31.
  • Each rib 34 extends in a distinct plane parallel to a depth of the reception space 31, this is i.e. here at the axis of revolution X6 of the reception space 31.
  • Each rib 34 comprises a base 35, located at the bottom 32 of the reception space 31, and a free end 36.
  • Each rib 34 has a notch 37 formed opposite the reception space 31, so that the width of each rib 34 decreases from the base 35 of the rib 34 to the free end 36 of the rib 34.
  • the frustoconical shape of the reception space 31 is defined by the notches 37 formed in the ribs 34.
  • the second damping support 30b has the same shape as the first damping support 30a.
  • the reception space 31 of the first damping support 30a and that of the second damping support 30b have an axis of revolution X6 combined, so that, looking along this axis of revolution X6, the first damping support 30a and the second damping support 30b are superimposed.
  • the ribs 34 of the first damping support 30a are defined in the continuity and in the extension of the ribs 34 of the second damping support 30b: these are the same ribs 34 which each comprise a half of rib belonging to the first damping support 30a and a half of rib belonging to the second damping support 30b.
  • first damping support 30a and the second damping support 30b are however arranged head to tail, on either side of the connecting axis X5 of the connecting portion 26: the bottom 32 of the space d reception 31 of the first damping support 30a is situated against or at least close to the bottom of the reception space 31 of the second damping support 30b,
  • the reception space 31 of the first damping support 30a is intended to accommodate a damping device 40a
  • the reception space 31 of the second damping support 30b is intended to accommodate a damping device 40b .
  • Each damping device 40 is made of a flexible material, here an elastomeric material.
  • each damping device 40 has a frustoconical external shape, and has a relatively small thickness.
  • the large radius face 41 of the damping device 40 is completely open, while the small radius face 42 of the damping device 40 is partially closed while having a central opening 43.
  • the central opening 43 allows suction and the evacuation of the air masses displaced by the movement of the membrane 19.
  • the assembly of the enclosure 11 is carried out as follows.
  • the stiffening part 25 is screwed into the box 12.
  • a damping device 40a is arranged in the reception space 31 of the first damping support 30a.
  • a damping device 40b is arranged in the reception space 31 of the second support amortization 30b.
  • the first speaker 18a is fixed to the first face 14 of the box 12 and the second speaker 18b is fixed to the fourth face 17 of the box 12. Then, the first speaker 18a, the first face 14, the second speaker 18b and 1a fourth face 17 are mounted on the rest of the box 12.
  • connection portion 26 of the stiffening piece 25 connects the internal walls of the second face 15 of the box 12 and of the third face 16 of the box 12.
  • the rear part of the first top speaker 18a bears against the damping device 40a positioned in the reception space 31 of the first damping support 30a.
  • the rear part of the second loudspeaker 18b bears against the damping device 40b positioned in the reception space 31 of the second damping support 30b.
  • the ribs 34 of the first damping support 30a and the ribs 34 of the second damping support 30b are all perpendicular to the first face 14 and to the fourth face 17 of the box 12, and are all parallel to the longitudinal axis X3 of the box 12.
  • the stiffening part 25 is structured by the ribs 34 which also stiffen the box 12.
  • the ribs 34 prevent deformation by swelling of the box 12 caused by variations in internal pressure due to the displacement of the membranes 19 of the first loudspeaker 18a and of the second speaker 18b.
  • the damping devices 40 significantly limit the pumping of the magnets 21 of the first loudspeaker 18a and of the second loudspeaker 18b, that is to say the translational movement of the magnets 21.
  • the damping devices 40 also significantly limit the balance of the magnets 21 around the balance axis X2.
  • the use of the stiffening part 25 thus makes it possible to move the three main resonant frequencies of the enclosure 11 outside the range of use of the first loudspeaker 18a and the second loudspeaker 18b (and the other loudspeakers -speakers of the enclosure 11), that is to say here beyond 300Hz.
  • the stiffening part 25 therefore makes it possible, with a simple assembly of a plastic part and two elastomer washers, to eliminate the sources of vibration of the enclosure 11 causing the parasitic noises.
  • the stiffening part 25 comprises a plurality of card supports 43.
  • Each card support 43 comprises a flat surface 44 of rectangular shape and four corners 45.
  • first card support 43a located at the first end 27 of the connection portion 26 and a second card support 43b located at the second end 28 of the connection portion 26.
  • planar surface 44 of the first card support 43a is parallel to the second face 15 of the box 12 and is located opposite and near the second face 15.
  • planar surface 44 of the second card support 43b is parallel to the third face 16 of the box 12 and is located opposite and near the third face 16.
  • the first card holder 43a is arranged to receive a first electric card 46a, which is positioned against the flat surface 44 of the first card holder 43a while being held in position between the four corners 45.
  • the first electric card is fixed to the first card holder 43a.
  • the first electric card 46a here includes a Wi-Fi antenna which does not interact with the speakers.
  • the second card holder 43b is arranged to receive a second electric card 46b, which is positioned against the flat surface 44 of the second card holder 43b while being held in position between the four corners 45.
  • the second electric card 46b is fixed to the second card holder 43b.
  • the second electric card 46b here includes a Wi-Fi antenna which does not interact with the speakers.
  • Grooves 48 are formed on the damping supports 30 of the stiffening part 25. Electrical wires connected to the first electrical card 46a and to the second electrical card 46b pass through the grooves 48. The grooves 48 allow both hold in position and protect these electrical wires.
  • the stiffening piece 26 makes it possible to integrate and protect, cleverly and inexpensively, electric cards 46 and wires inside the box 12.
  • the loudspeaker (s) which cooperate with the stiffening part are not necessarily mounted on an upper face or on a lower face of the box.
  • each built-in speaker could have a different shape (annular, cylindrical, etc.), just like the reception space of each support.
  • the rear part of the loudspeaker which is in contact with the damping device, is not necessarily the magnet, but may be any element located at the rear of the loudspeaker: part of the motor, part integral with the salad bowl, etc.
  • the damping device (s) may be different from those described here.
  • the damping devices could be integrated into the stiffening part, for example by being produced by overmolding.
  • the stiffening piece could belong to the box and form a single piece with the box (or at least with the second face and / or the third face of the box).
  • the connecting portion connects the internal walls of the second face of the box and of the third face of the box, it does not necessarily mean that the connecting portion is directly fixed on the internal walls: the connecting portion could be fixed on any parts which are themselves integral with the internal walls.

Abstract

A stiffening part (25) arranged to be integrated into the interior of a casing (12) of an audio speaker (11) in order to stiffen said casing, the audio speaker also being capable of comprising at least one loudspeaker (18a) mounted on a first face (14) of the casing, the stiffening part comprising a connecting portion, at least one damping support defining a receiving space arranged to receive a damping device (40a) intended to limit vibrations of the loudspeaker, wherein the damping support comprises a plurality of ribs (34) distributed around the receiving space (31), each rib extending in a distinct plane parallel to a depth of the receiving space, the stiffening part being arranged such that, when the enclosure (11) is assembled, the connecting portion interconnects inner walls of a second face (15) of the casing and a third face (16) of the casing opposite each other and both perpendicular to the first face (14), the damping device being positioned in the receiving space, and a rear portion of the loudspeaker abutting the damping device.

Description

Pièce de rigidification pour caisson d'enceinte acoustique Rigid piece for acoustic speaker box
DESCRIPTION DESCRIPTION
L' invention concerne le domaine des pièces de rigidification pour caisson d'enceinte acoustique. The invention relates to the field of stiffening parts for an acoustic enclosure.
ARRIERE PLAN DE L' INVENTION BACKGROUND OF THE INVENTION
Une enceinte acoustique comporte un caisson et un ou plusieurs haut-parleurs. Une ou plusieurs faces du caisson comprennent une ou plusieurs ouvertures destinées chacune à accueillir un haut-parleur. An acoustic enclosure comprises a box and one or more speakers. One or more faces of the box include one or more openings each intended to accommodate a speaker.
Dans une enceinte acoustique, le mouvement des membranes des haut-parleurs est à l'origine de vibrations qui produisent des bruits parasites. In an acoustic enclosure, the movement of the loudspeaker membranes is the source of vibrations which produce unwanted noise.
En référence aux figures 1 et 2, une enceinte de l'art antérieur 1 comporte un caisson 2 ayant une face supérieure, une face inférieure et des faces latérales. L'enceinte comprend de plus un premier haut-parleur 3a monté sur la face supérieure et un deuxième haut-parleur 3b monté sur la face inférieure du caisson 2. Le fonctionnement des haut-parleurs 3 excite trois modes de vibration de l'enceinte 1. With reference to FIGS. 1 and 2, an enclosure of the prior art 1 comprises a box 2 having an upper face, a lower face and lateral faces. The enclosure further comprises a first speaker 3a mounted on the upper face and a second speaker 3b mounted on the underside of the box 2. The operation of the speakers 3 excites three modes of vibration of the enclosure 1 .
Un premier mode de vibration résulte d'un mouvement de pompage des aimants 4 des haut-parleurs 3. L'aimant 4 de chaque haut-parleur 3 subit un mouvement de translation selon l'axe de translation XI (voir figure 1) qui est un axe longitudinal de l'enceinte 1. Ce mouvement de translation est dû à la masse relativement importante de l'aimant 4 et à la relative souplesse de la tôle 5 du haut- parleur 3 appelée « saladier », dans laquelle s'étend la membrane (non représentée) . Le mouvement de translation se produit dans le sens de fonctionnement de la membrane du haut-parleur 3. A first vibration mode results from a pumping movement of the magnets 4 of the loudspeakers 3. The magnet 4 of each loudspeaker 3 undergoes a translational movement along the translation axis XI (see FIG. 1) which is a longitudinal axis of the enclosure 1. This translational movement is due to the relatively large mass of the magnet 4 and to the relative flexibility of the sheet 5 of the loudspeaker 3 called "salad bowl", in which the membrane (not shown). The translational movement occurs in the operating direction of the diaphragm of the speaker 3.
Un deuxième mode de vibration résulte d'un mouvement de balancier des aimants 4 des haut-parleurs 3. L'aimant 4 de chaque haut-parleur 3 subit un mouvement de rotation autour d'un axe de balancier X2 qui passe par le centre de la membrane et qui est perpendiculaire à l' axe longitudinal du haut-parleur 3 (voir figure 2) . Ce mouvement de rotation est lui aussi dû à la masse relativement importante de l' aimant 4 et à la relative souplesse de la tôle du haut- parleur 3. A second mode of vibration results from a pendulum movement of the magnets 4 of the loudspeakers 3. The magnet 4 of each loudspeaker 3 undergoes a rotational movement around a pendulum axis X2 which passes through the center of the membrane and which is perpendicular to the longitudinal axis of the speaker 3 (see Figure 2). This rotational movement is also due to the relatively large mass of the magnet 4 and the relative flexibility of the sheet metal of the loudspeaker 3.
Un troisième mode de vibration résulte d' une déformation du caisson 2 de l' enceinte 1, qui « gonfle » du fait de la hausse de pression interne induite par le déplacement des membranes des haut-parleurs 3. A third mode of vibration results from a deformation of the box 2 of the enclosure 1, which "swells" due to the increase in internal pressure induced by the displacement of the membranes of the speakers 3.
OBJET DE L' INVENTION OBJECT OF THE INVENTION
1/ invention a pour objet de réduire les vibrations et donc les bruits parasites d'une enceinte acoustique. 1 / the object of the invention is to reduce the vibrations and therefore the parasitic noise of an acoustic enclosure.
RESUME DE L'INVENTION SUMMARY OF THE INVENTION
En vue de la réalisation de ce but, on propose une pièce de rigidification agencée pour être intégrée à l'intérieur d'un caisson d'une enceinte acoustique pour rigidifier ledit caisson, l'enceinte acoustique pouvant comprendre en outre au moins un haut-parleur monté sur une première face du caisson, la pièce de rigidification comportant une portion de liaison, au moins un support d'amortissement définissant un espace d'accueil agencé pour accueillir un dispositif d'amortissement destiné à limiter des vibrations du haut-parleur, le support d'amortissement comprenant une pluralités de nervures réparties autour de l'espace d'accueil, chaque nervure s'étendant dans un plan distinct parallèle à une profondeur de l'espace d'accueil, la pièce de rigidification étant agencée de sorte que, lorsque l'enceinte est assemblée, la portion de liaison relie entre elles des parois internes d'une deuxième face du caisson et d'une troisième face du caisson opposées l'une par rapport à l'autre et toutes deux perpendiculaires à la première face, le dispositif d'amortissement est positionné dans l'espace d'accueil, et une partie arrière du haut-parleur vient en appui contre le dispositif d'amortissement. La portion de liaison qui relie entre elles la deuxième face et la troisième face du caisson, les nervures et le dispositif d'amortissement positionné dans l'espace d'accueil permettent de limiter les vibrations qui viennent d'être évoquées. Grâce à la pièce de rigidification selon l'invention, les trois principales fréquences de résonance de l'enceinte sont déplacées en dehors de la plage d'utilisation du haut-parleur, et les bruits parasites sont réduits de manière très importante. With a view to achieving this goal, a stiffening piece is proposed which is designed to be integrated inside a box of an acoustic enclosure in order to stiffen said box, the acoustic enclosure possibly further comprising at least one loudspeaker. speaker mounted on a first face of the box, the stiffening part comprising a connecting portion, at least one damping support defining a reception space arranged to receive a damping device intended to limit vibrations of the loudspeaker, the damping support comprising a plurality of ribs distributed around the reception space, each rib extending in a separate plane parallel to a depth of the reception space, the stiffening part being arranged so that , when the enclosure is assembled, the connecting portion interconnects internal walls of a second face of the box and a third face of the box opposite to each other and all of them perpendicular to the first face, the damping device is positioned in the reception space, and a rear part of the loudspeaker comes to bear against the damping device. The connecting portion which connects the second face and the third face of the box, the ribs and the damping device positioned in the reception space make it possible to limit the vibrations which have just been mentioned. Thanks to the stiffening part according to the invention, the three main resonant frequencies of the enclosure are moved outside the range of use of the loudspeaker, and the parasitic noise is reduced very significantly.
On propose de plus une enceinte comprenant un caisson, un haut-parleur, la pièce de rigidification qui vient d'être décrite, et un dispositif d'amortissement. An enclosure is also proposed comprising a box, a loudspeaker, the stiffening part which has just been described, and a damping device.
L' invention sera mieux comprise à la lumière de la description qui suit d'un mode de mise en œuvre particulier non limitatif de l' invention. The invention will be better understood in the light of the following description of a particular non-limiting embodiment of the invention.
BREVE DESCRIPTION DES DESSINS BRIEF DESCRIPTION OF THE DRAWINGS
Il sera fait référence aux dessins annexés, parmi lesquels : Reference will be made to the appended drawings, among which:
[Fig. 1] la figure 1 est une vue en perspective d'un caisson et de deux haut-parleurs d'une enceinte selon l'art anté rieur, la vue étant coupée dans un plan parallèle à un axe longitudinal de l'enceinte ; [Fig. 1] Figure 1 is a perspective view of a box and two speakers of an enclosure according to the prior art, the view being cut in a plane parallel to a longitudinal axis of the enclosure;
[Fig. 2] la figure 2 est une vue analogue à celle de la figure 1, l'un des deux haut-parleurs subissant un mouve ment de balancier ; [Fig. 2] Figure 2 is a view similar to that of Figure 1, one of the two speakers undergoing a pendulum movement;
[Fig. 3] la figure 3 est une vue en perspective d'une enceinte comportant un caisson, deux haut-parleurs, deux dispositifs d' amortissement, et une pièce de rigidifica tion selon l'invention ; [Fig. 3] Figure 3 is a perspective view of an enclosure comprising a box, two speakers, two damping devices, and a stiffening part according to the invention;
[Fig. 4] la figure 4 est une vue similaire à celle de la figure 3, la vue étant coupée dans un plan parallèle à un axe longitudinal de l'enceinte ; [Fig. 5] la figure 5 est une vue en perspective de la pièce de rigidification selon l'invention ; [Fig. 4] Figure 4 is a view similar to that of Figure 3, the view being cut in a plane parallel to a longitudinal axis of the enclosure; [Fig. 5] Figure 5 is a perspective view of the stiffening part according to the invention;
[Fig. 6] la figure 6 est une vue en perspective d'un dis- positif d'amortissement. [Fig. 6] Figure 6 is a perspective view of a damping device.
DESCRIPTION DETAILLEE DE L'INVENTION DETAILED DESCRIPTION OF THE INVENTION
En référence aux figures 3 et 4, l'invention est ici mise en œuvre dans une enceinte acoustique 11 qui est en l'occurrence une enceinte connectée. With reference to FIGS. 3 and 4, the invention is here implemented in an acoustic enclosure 11 which is in this case a connected enclosure.
L'enceinte 11 comprend tout d'abord un caisson 12 et une pluralité de haut-parleurs. The enclosure 11 firstly comprises a box 12 and a plurality of speakers.
Le caisson 12 présente une forme extérieure générale parallélépipédique. Le caisson 12 comprend une face supérieure, appelée ici première face 14, quatre faces latérales, parmi lesquelles on trouve deux faces opposées [c'est-à-dire situées l'une en face de l'autre) appelées ici deuxième face 15 et troisième face 16, et une face inférieure, appelée ici quatrième face 17. The box 12 has a generally parallelepiped exterior shape. The box 12 comprises an upper face, here called first face 14, four side faces, among which there are two opposite faces (that is to say located one opposite the other) called here second face 15 and third face 16, and a lower face, here called fourth face 17.
Ainsi, la première face 14 et la quatrième face 17 sont deux faces opposées qui sont toutes deux perpendiculaires à la deuxième face 15 et à la troisième face 16. Thus, the first face 14 and the fourth face 17 are two opposite faces which are both perpendicular to the second face 15 and to the third face 16.
On appelle ici « axe longitudinal du caisson » l'axe X3 qui passe par le centre de la première face 14 et de la quatrième face 17. The axis X3 which passes through the center of the first face 14 and the fourth face 17 is called here "longitudinal axis of the box".
La pluralité de haut-parleurs comprend un premier haut-parleur 18a et un deuxième haut-parleur 18b, ainsi que d'autres haut-parleurs qui ne seront pas décrits ici. The plurality of speakers includes a first speaker 18a and a second speaker 18b, as well as other speakers which will not be described here.
Le premier haut-parleur 18a et le deuxième haut- parleur 18b comprennent ici chacun une membrane 19, une tôle 20 appelée « saladier » dans laquelle s'étend la membrane 19, une bobine et un aimant 21. Chaque aimant 21 présente ici une forme tronconique dont le rayon diminue vers l'arrière du haut-parleur 18. On appelle ici « partie avant » de chaque haut-parleur 18 la partie qui comprend la membrane 19, et « partie arrière » la partie du côté opposé à la membrane 19. La partie arrière comprend donc ici l' aimant 21. On appelle ici « axe longitudinal de haut- parleur » X4 l'axe de révolution de l'aimant 21, qui passe aussi par le centre de la membrane 19, et on nomme « hauteur » du haut-parleur 18 la dimension du haut-parleur 18 selon son axe longitudinal X4. The first loudspeaker 18a and the second loudspeaker 18b here each comprise a membrane 19, a sheet 20 called a "bowl" in which the membrane 19 extends, a coil and a magnet 21. Each magnet 21 has here a shape frusto-conical, the radius of which decreases towards the rear of the loudspeaker 18. The term “front part” of each loudspeaker 18 is used here to refer to the part which comprises the membrane 19, and “rear part” to the side part opposite the membrane 19. The rear part therefore here comprises the magnet 21. Here the term "longitudinal axis of the loudspeaker" X4 is the axis of revolution of the magnet 21, which also passes through the center of the membrane 19 , and the height of the loudspeaker 18 is called “height” of the loudspeaker 18 along its longitudinal axis X4.
Le premier haut-parleur 18a est monté sur la première face 14 du caisson 12. Le premier haut-parleur 18a est fixé à la première face 14, l'axe longitudinal X4 du premier haut-parleur 18a étant perpendiculaire à 1a première face 14. La première face 14 présente une ouverture dont la forme coïncide avec la circonférence du grand diamètre de la membrane 19 du premier haut-parleur 18a et dans laquelle débouche la membrane 19. The first speaker 18a is mounted on the first face 14 of the box 12. The first speaker 18a is fixed to the first face 14, the longitudinal axis X4 of the first speaker 18a being perpendicular to the first face 14. The first face 14 has an opening whose shape coincides with the circumference of the large diameter of the membrane 19 of the first loudspeaker 18a and into which the membrane 19 opens.
Le deuxième haut-parleur 18b est monté de la même manière sur la quatrième face 17 du caisson 12. The second loudspeaker 18b is mounted in the same way on the fourth face 17 of the box 12.
Le premier haut-parleur 18a et le deuxième haut- parleur 18b sont donc montés tête-bêche dans le caisson 12, et leurs axes longitudinaux X4 sont confondus. Les axes longitudinaux X4 du premier haut-parleur 18a et du deuxième haut-parleur 18b sont parallèles avec l'axe longitudinal X3 du caisson 12. The first loudspeaker 18a and the second loudspeaker 18b are therefore mounted head to tail in the casing 12, and their longitudinal axes X4 are merged. The longitudinal axes X4 of the first loudspeaker 18a and of the second loudspeaker 18b are parallel with the longitudinal axis X3 of the box 12.
En référence à la figure 5, l'enceinte comprend aussi une pièce de rigidification 25 intégrée à l'intérieur du caisson 12. With reference to FIG. 5, the enclosure also comprises a stiffening part 25 integrated inside the box 12.
La pièce de rigidification 25 est positionnée entre le premier haut-parleur 18a et le deuxième haut-parleur 18b, The stiffening part 25 is positioned between the first loudspeaker 18a and the second loudspeaker 18b,
La pièce de rigidification 25 est fabriquée en un matériau thermoplastique. The stiffening part 25 is made of a thermoplastic material.
La pièce de rigidification 25 comprend tout d'abord une portion de liaison 26 (que l'on pourrait aussi appeler « poutre ») . The stiffening part 25 firstly comprises a connecting portion 26 (which could also be called "beam").
La portion de liaison 26 relie entre elles la paroi interne de la deuxième face 15 et la paroi interne de la troisième face 16. La portion de liaison 26 s' étend en longueur selon un axe de liaison X5 qui, lorsque la pièce de rigidification 25 est positionnée dans le caisson 12, est parallèle à un axe transversal du caisson 12 et est orthogonal à 1 axe longitudinal X3 du caisson 12. La portion de liaison s'étend donc parallèlement à 1a première face 14 et à la quatrième face 17 du caisson 12. The connecting portion 26 interconnects the internal wall of the second face 15 and the internal wall of the third face 16. The connecting portion 26 extends in length along a connecting axis X5 which, when the stiffening piece 25 is positioned in the box 12, is parallel to a transverse axis of the box 12 and is orthogonal to 1 axis longitudinal X3 of the box 12. The connecting portion therefore extends parallel to the first face 14 and to the fourth face 17 of the box 12.
La portion de liaison 26 comprend ici une première extrémité 27 et une deuxième extrémité 28 munies chacune de moyens de fixation à une face du caisson 12, en l'occurrence ici d'un taraudage 29. La première extrémité 27 de la portion de liaison 26 est fixée par vissage à la deuxième face 15 du caisson 12, alors que la deuxième extrémité 28 de la portion de liaison 26 est fixée par vissage à la troisième face 16 du caisson 12. Une première vis 38 (visible sur la figure 4) s'étend ainsi au travers de la deuxième face 15 pour être vissée dans le taraudage 29 de la première extrémité 27, et une deuxième vis 38 s'étend au travers de la troisième face 16 pour être vissée dans le taraudage 29 de la deuxième extrémité 28 de la portion de liaison 26. The connection portion 26 here comprises a first end 27 and a second end 28 each provided with means for fixing to one face of the box 12, in this case here a thread 29. The first end 27 of the connection portion 26 is fixed by screwing to the second face 15 of the box 12, while the second end 28 of the connecting portion 26 is fixed by screwing to the third face 16 of the box 12. A first screw 38 (visible in FIG. 4) s 'thus extends through the second face 15 to be screwed into the thread 29 of the first end 27, and a second screw 38 extends through the third face 16 to be screwed into the thread 29 of the second end 28 of the connecting portion 26.
La pièce de rigidification 25 comporte de plus un premier support d'amortissement 30a et un deuxième support d'amortissement 30b. The stiffening part 25 further comprises a first damping support 30a and a second damping support 30b.
Le premier support d'amortissement 30a et le deuxième support d'amortissement 30b sont situés au niveau d'une partie centrale de la portion de liaison 26. The first damping support 30a and the second damping support 30b are located at a central part of the connecting portion 26.
On décrit tout d'abord le premier support d'amortissement 30a. Firstly, the first damping support 30a is described.
Le premier support d'amortissement 30a définit un espace d'accueil 31 ayant une forme générale de révolution, en l'occurrence une forme tronconique. L'axe de révolution X6 de l'espace d'accueil 31 est orthogonal à l'axe de liaison X5 de la portion de liaison 26. The first damping support 30a defines a reception space 31 having a general shape of revolution, in this case a frustoconical shape. The axis of revolution X6 of the reception space 31 is orthogonal to the connection axis X5 of the connection portion 26.
Le rayon de l'espace d'accueil 31 est réduit au niveau d'un fond 32 de l'espace d'accueil 31, et augmente jusqu'à l'ouverture principale de l'espace d'accueil 31, qui s'étend en regard du fond 32 de l'espace d'accueil 31. The radius of the reception space 31 is reduced to the level a bottom 32 of the reception space 31, and increases until the main opening of the reception space 31, which extends opposite the bottom 32 of the reception space 31.
Le premier support d'amortissement 30a comprend des nervures 34 qui sont réparties, avec une orientation différente, autour de l'espace d'accueil 31. Les nervures 34 présentent chacune la forme d'une ailette. Les nervures 34 s'étendent radialement autour de l'espace d'accueil 31 depuis la circonférence de l'espace d'accueil 31. La longueur de chaque nervure est parallèle à l'axe de révolution X6 de l'espace d'accueil 31, et la largeur de chaque nervure 34 est définie dans le prolongement du rayon de l'espace d'accueil 31. Chaque nervure 34 s'étend dans un plan distinct parallèle à une profondeur de l'espace d'accueil 31, c'est-à-dire ici à l'axe de révolution X6 de l'espace d'accueil 31. The first damping support 30a comprises ribs 34 which are distributed, with a different orientation, around the reception space 31. The ribs 34 each have the shape of a fin. The ribs 34 extend radially around the reception space 31 from the circumference of the reception space 31. The length of each rib is parallel to the axis of revolution X6 of the reception space 31 , and the width of each rib 34 is defined in the extension of the radius of the reception space 31. Each rib 34 extends in a distinct plane parallel to a depth of the reception space 31, this is i.e. here at the axis of revolution X6 of the reception space 31.
Chaque nervure 34 comprend une base 35, située au niveau du fond 32 de l'espace d'accueil 31, et une extrémité libre 36. Chaque nervure 34 présente une échancrure 37 formée en regard de l'espace d'accueil 31, de sorte que la largeur de chaque nervure 34 diminue depuis la base 35 de la nervure 34 jusqu'à l'extrémité libre 36 de la nervure 34. La forme tronconique de l'espace d'accueil 31 est définie par les échancrures 37 formées dans les nervures 34. Each rib 34 comprises a base 35, located at the bottom 32 of the reception space 31, and a free end 36. Each rib 34 has a notch 37 formed opposite the reception space 31, so that the width of each rib 34 decreases from the base 35 of the rib 34 to the free end 36 of the rib 34. The frustoconical shape of the reception space 31 is defined by the notches 37 formed in the ribs 34.
Le deuxième support d'amortissement 30b présente la même forme que le premier support d'amortissement 30a. L'espace d'accueil 31 du premier support d'amortissement 30a et celui du deuxième support d'amortissement 30b ont un axe de révolution X6 confondu, de sorte que, en regardant selon cet axe de révolution X6, le premier support d'amortissement 30a et le deuxième support d'amortissement 30b sont superposés. Les nervures 34 du premier support d'amortissement 30a sont définies dans la continuité et dans le prolongement des nervures 34 du deuxième support d'amortissement 30b : ce sont les mêmes nervures 34 qui comprennent chacune une moitié de nervure appartenant au premier support d'amortissement 30a et une moitié de nervure appartenant au deuxième support d'amortissement 30b. The second damping support 30b has the same shape as the first damping support 30a. The reception space 31 of the first damping support 30a and that of the second damping support 30b have an axis of revolution X6 combined, so that, looking along this axis of revolution X6, the first damping support 30a and the second damping support 30b are superimposed. The ribs 34 of the first damping support 30a are defined in the continuity and in the extension of the ribs 34 of the second damping support 30b: these are the same ribs 34 which each comprise a half of rib belonging to the first damping support 30a and a half of rib belonging to the second damping support 30b.
te premier support d'amortissement 30a et le deuxième support d'amortissement 30b sont cependant disposés tête- bêche, de part et d'autre de l'axe de liaison X5 de la portion de liaison 26 : le fond 32 de l'espace d'accueil 31 du premier support d'amortissement 30a est situé contre ou tout au moins à proximité du fond de l'espace d'accueil 31 du deuxième support d'amortissement 30b, te first damping support 30a and the second damping support 30b are however arranged head to tail, on either side of the connecting axis X5 of the connecting portion 26: the bottom 32 of the space d reception 31 of the first damping support 30a is situated against or at least close to the bottom of the reception space 31 of the second damping support 30b,
L'espace d'accueil 31 du premier support d'amortissement 30a est destiné à accueillir un dispositif d'amortissement 40a, et l'espace d'accueil 31 du deuxième support d'amortissement 30b est destiné à accueillir un dispositif d'amortissement 40b. The reception space 31 of the first damping support 30a is intended to accommodate a damping device 40a, and the reception space 31 of the second damping support 30b is intended to accommodate a damping device 40b .
Chaque dispositif d'amortissement 40 est fabriqué en une matière souple, ici en un matériau élastomère . Each damping device 40 is made of a flexible material, here an elastomeric material.
En référence à la figure 6, chaque dispositif d'amortissement 40 présente une forme extérieure tronconique, et a une épaisseur relativement faible. La face 41 de grand rayon du dispositif d'amortissement 40 est complètement ouverte, alors que la face 42 de petit rayon du dispositif d'amortissement 40 est partiellement fermée tout en présentant une ouverture centrale 43. L'ouverture centrale 43 permet l'aspiration et l'évacuation des masses d'air déplacées par le mouvement de la membrane 19. Referring to Figure 6, each damping device 40 has a frustoconical external shape, and has a relatively small thickness. The large radius face 41 of the damping device 40 is completely open, while the small radius face 42 of the damping device 40 is partially closed while having a central opening 43. The central opening 43 allows suction and the evacuation of the air masses displaced by the movement of the membrane 19.
L'assemblage de l'enceinte 11 est réalisé de la manière suivante. La pièce de rigidification 25 est vissée dans le caisson 12. Un dispositif d'amortissement 40a est disposé dans l'espace d'accueil 31 du premier support d'amortissement 30a. Un dispositif d'amortissement 40b est disposé dans l'espace d'accueil 31 du deuxième support d' amortissement 30b. Le premier haut-parleur 18a est fixé à la première face 14 du caisson 12 et le deuxième haut- parleur 18b est fixé à la quatrième face 17 du caisson 12. Puis, le premier-haut-parleur 18a, la première face 14, le deuxième haut-parleur 18b et 1a quatrième face 17 sont montés sur le reste du caisson 12. The assembly of the enclosure 11 is carried out as follows. The stiffening part 25 is screwed into the box 12. A damping device 40a is arranged in the reception space 31 of the first damping support 30a. A damping device 40b is arranged in the reception space 31 of the second support amortization 30b. The first speaker 18a is fixed to the first face 14 of the box 12 and the second speaker 18b is fixed to the fourth face 17 of the box 12. Then, the first speaker 18a, the first face 14, the second speaker 18b and 1a fourth face 17 are mounted on the rest of the box 12.
Lorsque l' enceinte 11 est assemblée, la portion de liaison 26 de la pièce de rigidification 25 relie entre elles les parois internes de la deuxième face 15 du caisson 12 et de la troisième face 16 du caisson 12. La partie arrière du premier haut-parleur 18a vient en appui contre le dispositif d'amortissement 40a positionné dans l'espace d'accueil 31 du premier support d'amortissement 30a. La partie arrière du deuxième haut-parleur 18b vient en appui contre le dispositif d'amortissement 40b positionné dans l'espace d'accueil 31 du deuxième support d'amortissement 30b . When the enclosure 11 is assembled, the connection portion 26 of the stiffening piece 25 connects the internal walls of the second face 15 of the box 12 and of the third face 16 of the box 12. The rear part of the first top speaker 18a bears against the damping device 40a positioned in the reception space 31 of the first damping support 30a. The rear part of the second loudspeaker 18b bears against the damping device 40b positioned in the reception space 31 of the second damping support 30b.
Les nervures 34 du premier support d'amortissement 30a et les nervures 34 du deuxième support d'amortissement 30b sont toutes perpendiculaires à la première face 14 et à la quatrième face 17 du caisson 12, et sont toutes parallèles à l'axe longitudinal X3 du caisson 12. The ribs 34 of the first damping support 30a and the ribs 34 of the second damping support 30b are all perpendicular to the first face 14 and to the fourth face 17 of the box 12, and are all parallel to the longitudinal axis X3 of the box 12.
La pièce de rigidification 25, qui est fixée dans le caisson 12 à ses extrémités, permet de rigidifier le caisson 12. The stiffening part 25, which is fixed in the box 12 at its ends, makes it possible to stiffen the box 12.
La pièce de rigidification 25 est structurée par les nervures 34 qui elles aussi rigidifient le caisson 12. Les nervures 34 empêchent les déformations par gonflement du caisson 12 causé par les variations de pression interne dues au déplacement des membranes 19 du premier haut- parleur 18a et du deuxième haut-parleur 18b. The stiffening part 25 is structured by the ribs 34 which also stiffen the box 12. The ribs 34 prevent deformation by swelling of the box 12 caused by variations in internal pressure due to the displacement of the membranes 19 of the first loudspeaker 18a and of the second speaker 18b.
Les dispositifs d'amortissement 40, quant à eux, limitent de manière importante le pompage des aimants 21 du premier haut-parleur 18a et du deuxième haut-parleur 18b, c'est-à-dire le mouvement de translation des aimants 21. Les dispositifs d'amortissement 40 limitent aussi de manière importante le balancier des aimants 21 autour de l'axe de balancier X2. The damping devices 40, for their part, significantly limit the pumping of the magnets 21 of the first loudspeaker 18a and of the second loudspeaker 18b, that is to say the translational movement of the magnets 21. The damping devices 40 also significantly limit the balance of the magnets 21 around the balance axis X2.
L'utilisation de la pièce de rigidification 25 permet ainsi de déplacer les trois principales fréquences de résonance de l'enceinte 11 en dehors de la plage d'utilisation du premier haut-parleur 18a et du deuxième haut-parleur 18b (et des autres haut-parleurs de l'enceinte 11) , c'est-à-dire ici au-delà de 300Hz . La pièce de rigidification 25 permet donc, avec un assemblage simple d'une pièce en plastique et de deux rondelles d' élastomère, de supprimer les sources de vibration de l'enceinte 11 entraînant les bruits parasites. The use of the stiffening part 25 thus makes it possible to move the three main resonant frequencies of the enclosure 11 outside the range of use of the first loudspeaker 18a and the second loudspeaker 18b (and the other loudspeakers -speakers of the enclosure 11), that is to say here beyond 300Hz. The stiffening part 25 therefore makes it possible, with a simple assembly of a plastic part and two elastomer washers, to eliminate the sources of vibration of the enclosure 11 causing the parasitic noises.
On remarque que la pièce de rigidification 25 comporte une pluralité de supports de carte 43. Chaque support de carte 43 comporte une surface plane 44 de forme rectangulaire et quatre coins 45. It is noted that the stiffening part 25 comprises a plurality of card supports 43. Each card support 43 comprises a flat surface 44 of rectangular shape and four corners 45.
On trouve notamment un premier support de carte 43a situé au niveau de la première extrémité 27 de la portion de liaison 26 et un deuxième support de carte 43b situé au niveau de la deuxième extrémité 28 de la portion de liaison 26. There is in particular a first card support 43a located at the first end 27 of the connection portion 26 and a second card support 43b located at the second end 28 of the connection portion 26.
Lorsque la pièce de rigidification 25 est montée dans le caisson 12, la surface plane 44 du premier support de carte 43a est parallèle à la deuxième face 15 du caisson 12 et est située en regard et à proximité de la deuxième face 15. La surface plane 44 du deuxième support de carte 43b est parallèle à la troisième face 16 du caisson 12 et est située en regard et à proximité de la troisième face 16. When the stiffening part 25 is mounted in the box 12, the planar surface 44 of the first card support 43a is parallel to the second face 15 of the box 12 and is located opposite and near the second face 15. The planar surface 44 of the second card support 43b is parallel to the third face 16 of the box 12 and is located opposite and near the third face 16.
Le premier support de carte 43a est agencé pour accueillir une première carte électrique 46a, qui est positionnée contre la surface plane 44 du premier support de carte 43a en étant maintenue en position entre les quatre coins 45. La première carte électrique est fixée au premier support de carte 43a. The first card holder 43a is arranged to receive a first electric card 46a, which is positioned against the flat surface 44 of the first card holder 43a while being held in position between the four corners 45. The first electric card is fixed to the first card holder 43a.
La première carte électrique 46a inclut ici une antenne Wi-Fi qui n'interagit pas avec les haut-parleurs. The first electric card 46a here includes a Wi-Fi antenna which does not interact with the speakers.
Le deuxième support de carte 43b est agencé pour accueillir une deuxième carte électrique 46b, qui est positionnée contre la surface plane 44 du deuxième support de carte 43b en étant maintenue en position entre les quatre coins 45. La deuxième carte électrique 46b est fixée au deuxième support de carte 43b. The second card holder 43b is arranged to receive a second electric card 46b, which is positioned against the flat surface 44 of the second card holder 43b while being held in position between the four corners 45. The second electric card 46b is fixed to the second card holder 43b.
La deuxième carte électrique 46b inclut ici une antenne Wi-Fi qui n'interagit pas avec les haut-parleurs. The second electric card 46b here includes a Wi-Fi antenna which does not interact with the speakers.
On trouve aussi un troisième support de carte 43c positionné au niveau de la partie centrale de la portion de liaison 26. There is also a third card holder 43c positioned at the level of the central part of the connection portion 26.
Des rainures 48 sont formées sur les supports d'amortissement 30 de la pièce de rigidification 25, Des fils électriques reliés à la première carte électrique 46a et à la deuxième carte électrique 46b cheminent dans les rainures 48. Les rainures 48 permettent à la fois de maintenir en position et de protéger ces fils électriques. Grooves 48 are formed on the damping supports 30 of the stiffening part 25. Electrical wires connected to the first electrical card 46a and to the second electrical card 46b pass through the grooves 48. The grooves 48 allow both hold in position and protect these electrical wires.
Ainsi, on constate que, outre son rôle de rigidification et de support des dispositifs d'amortissement 40, la pièce de rigidification 26 permet d'intégrer et de protéger, de manière astucieuse et peu coûteuse, des cartes électriques 46 et des fils à l'intérieur du caisson 12. Thus, it can be seen that, in addition to its role of stiffening and supporting the damping devices 40, the stiffening piece 26 makes it possible to integrate and protect, cleverly and inexpensively, electric cards 46 and wires inside the box 12.
Bien entendu, l'invention n'est pas limitée au mode de réalisation décrit mais englobe toute variante entrant dans le champ de l'invention telle que définie par les revendications , Of course, the invention is not limited to the embodiment described but encompasses any variant coming within the scope of the invention as defined by the claims,
Le ou les haut-parleurs qui coopèrent avec la pièce de rigidification ne sont pas nécessairement montés sur une face supérieure ou sur une face inférieure du caisson. The loudspeaker (s) which cooperate with the stiffening part are not necessarily mounted on an upper face or on a lower face of the box.
La forme des éléments décrits pourrait être différente. En particulier, l'aimant de chaque haut- parleur pourrait avoir une forme différente (annulaire, cylindrique, etc.), tout comme d'ailleurs l'espace d'accueil de chaque support. The shape of the elements described could be different. In particular, the magnet of each built-in speaker could have a different shape (annular, cylindrical, etc.), just like the reception space of each support.
La partie arrière du haut-parleur, qui est en contact avec le dispositif d'amortissement, n'est pas nécessairement l'aimant, mais peut être tout élément situé à l'arrière du haut-parleur : partie du moteur, pièce solidaire du saladier, etc. The rear part of the loudspeaker, which is in contact with the damping device, is not necessarily the magnet, but may be any element located at the rear of the loudspeaker: part of the motor, part integral with the salad bowl, etc.
Le ou les dispositifs d'amortissement peuvent être différents de ceux décrits ici. Les dispositifs d'amortissement pourraient être intégrés à la pièce de rigidification, en étant par exemple fabriqués par surmoulage . The damping device (s) may be different from those described here. The damping devices could be integrated into the stiffening part, for example by being produced by overmolding.
La pièce de rigidification pourrait appartenir au caisson et former une pièce unique avec le caisson (ou tout au moins avec la deuxième face et/ou la troisième face du caisson). On note d'ailleurs que, lorsque l'on dit que la portion de liaison relie entre elles les parois internes de la deuxième face du caisson et de la troisième face du caisson, on ne veut pas dire nécessairement que la portion de liaison est directement fixée sur les parois internes : la portion de liaison pourrait être fixée sur des pièces quelconques elles-mêmes solidaires des parois internes. The stiffening piece could belong to the box and form a single piece with the box (or at least with the second face and / or the third face of the box). Note also that when we say that the connecting portion connects the internal walls of the second face of the box and of the third face of the box, it does not necessarily mean that the connecting portion is directly fixed on the internal walls: the connecting portion could be fixed on any parts which are themselves integral with the internal walls.

Claims

REVENDICATIONS
1. Pièce de rigidification (25) agencée pour être intégrée à l' intérieur d'un caisson (12) d'une enceinte acoustique (11) pour rigidifier ledit caisson, l'enceinte acoustique pouvant comprendre en outre au moins un haut-parleur (18a) monté sur une première face (14) du caisson, la pièce de rigidification comportant une portion de liaison (26) , au moins un support d'amortissement (30a) définissant un espace d'accueil (31) agencé pour accueillir un dispositif d'amortissement (40a) destiné à limiter des vibrations du haut-parleur, le support d'amortissement comprenant une pluralités de nervures (34) réparties autour de l'espace d'accueil (31), chaque nervure s'étendant dans un plan distinct parallèle à une profondeur de l'espace d'accueil, la pièce de rigidification étant agencée de sorte que, lorsque l'enceinte (11) est assemblée, la portion de liaison (26) relie entre elles des parois internes d'une deuxième face (15) du caisson et d'une troisième face (16) du caisson opposées l'une par rapport à l'autre et toutes deux perpendiculaires à la première face (14), le dispositif d'amortissement est positionné dans l'espace d'accueil, et une partie arrière du haut-parleur vient en appui contre le dispositif d'amortissement. 1. stiffening piece (25) arranged to be integrated inside a box (12) of an acoustic enclosure (11) to stiffen said box, the acoustic enclosure may further comprise at least one speaker (18a) mounted on a first face (14) of the box, the stiffening part comprising a connecting portion (26), at least one damping support (30a) defining a reception space (31) arranged to accommodate a damping device (40a) intended to limit vibrations of the loudspeaker, the damping support comprising a plurality of ribs (34) distributed around the reception space (31), each rib extending in a separate plane parallel to a depth of the reception space, the stiffening part being arranged so that, when the enclosure (11) is assembled, the connecting portion (26) connects internal walls of a second face (15) of the box and a third face (16) of the box opposite one p ar relative to the other and both perpendicular to the first face (14), the damping device is positioned in the reception space, and a rear part of the loudspeaker comes to bear against the damping device .
2. Pièce de rigidification selon la revendication 1, dans laquelle l'espace d'accueil (31) présente une forme générale de révolution, et dans laquelle les nervures (34) s'étendent radialement autour de l'espace d'accueil. 2. A stiffening piece according to claim 1, in which the reception space (31) has a general shape of revolution, and in which the ribs (34) extend radially around the reception space.
3. Pièce de rigidification selon l'une des revendications précédentes, dans laquelle chaque nervure (34) présente la forme d'une ailette. 3. Rigid piece according to one of the preceding claims, wherein each rib (34) has the shape of a fin.
4. Pièce de rigidification selon l'une des revendications précédentes, dans laquelle la forme de l'espace d'accueil (31) est définie par des échancrures (37) formées dans les nervures, en regard de l'espace d'accueil. 4. Rigid piece according to one of the preceding claims, in which the shape of the reception space (31) is defined by notches (37) formed in the ribs, facing the reception space.
5. Pièce de rigidification selon l'une des revendications précédentes, dans laquelle une largeur de chaque nervure (34) diminue entre une base {35) de la nervure et une extrémité libre (36) de la nervure, de sorte que l'espace d'accueil (31) présente une forme tronconique . 5. Rigid piece according to one of the preceding claims, in which a width of each rib (34) decreases between a base {35) of the rib and a free end (36) of the rib, so that the space reception (31) has a frustoconical shape.
6. Pièce de rigidification selon l'une des revendications précédentes, dans laquelle la portion de liaison présente deux extrémités qui comprennent des moyens de fixation (29) de la pièce de rigidification (25) à la deuxième face (15) et à la troisième face (16) du caisson. 6. Rigid piece according to one of the preceding claims, in which the connecting portion has two ends which comprise means (29) for fixing the stiffening piece (25) to the second face (15) and to the third face (16) of the box.
7. Pièce de rigidification selon l'une des revendications précédentes, la pièce de rigidification étant fabriquée en un matériau thermoplastique. 7. stiffening part according to one of the preceding claims, the stiffening part being made of a thermoplastic material.
8. Pièce de rigidification selon l'une des revendications précédentes, l'enceinte pouvant comporter au moins un premier haut-parleur (18a) monté sur la première face (14) du caisson et un deuxième haut-parleur (18b) monté sur une quatrième face (17) du caisson opposée à la première face, le premier haut-parleur et le deuxième haut-parleur étant montés tête-bêche, la pièce de rigidification comprenant un premier support d'amortissement (30a) et un deuxième support d'amortissement (30b) disposés tête-bêche. 8. Rigid piece according to one of the preceding claims, the enclosure possibly comprising at least a first loudspeaker (18a) mounted on the first face (14) of the box and a second loudspeaker (18b) mounted on a fourth face (17) of the box opposite to the first face, the first loudspeaker and the second loudspeaker being mounted head to tail, the stiffening part comprising a first damping support (30a) and a second support damping (30b) arranged head to tail.
9. Pièce de rigidification selon l'une des revendications précédentes, comprenant en outre au moins un support de carte (43a) sur lequel peut être fixée une carte électrique (46a) . 9. Rigid piece according to one of the preceding claims, further comprising at least one card support (43a) on which can be fixed an electric card (46a).
10. Pièce de rigidification selon la revendication 9, comprenant deux supports de carte présentant chacun une surface plane (44) et situés chacun à une extrémité de la portion de liaison (26) . 10. A stiffening piece according to claim 9, comprising two card supports each having a flat surface (44) and each located at one end of the connecting portion (26).
11. Pièce de rigidification selon la revendication 9, comprenant en outre des rainures (48) agencées pour que des fils, reliés à la carte électrique, cheminent dans les rainures . 11. A stiffening piece according to claim 9, further comprising grooves (48) arranged so that the wires, connected to the electric card, pass through the grooves.
12. Enceinte comprenant un caisson, un haut-parleur, une pièce de rigidification selon l'une des revendications précédentes, et un dispositif d'amortissement (40), 12. Enclosure comprising a box, a loudspeaker, a stiffening part according to one of the preceding claims, and a damping device (40),
13. Enceinte selon la revendication 12, dans laquelle le dispositif d'amortissement (40) est fabriqué en un matériau élastomère . 13. The enclosure of claim 12, wherein the damping device (40) is made of an elastomeric material.
14. Enceinte selon la revendication 12, comprenant une pièce de rigidification (25) selon la revendication 8, un premier haut-parleur (18a) monté sur une première face du caisson, un deuxième haut-parleur (18b) monté sur une quatrième face du caisson, ainsi que deux dispositifs d'amortissement, le premier haut-parleur et le deuxième haut-parleur étant montés tête-bêche dans l'enceinte. 14. Enclosure according to claim 12, comprising a stiffening piece (25) according to claim 8, a first loudspeaker (18a) mounted on a first face of the box, a second loudspeaker (18b) mounted on a fourth face of the box, as well as two damping devices, the first loudspeaker and the second loudspeaker being mounted head to tail in the enclosure.
EP19802179.2A 2018-12-03 2019-11-14 Stiffening part for an audio speaker casing Pending EP3892010A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1872244A FR3089380B1 (en) 2018-12-03 2018-12-03 Stiffening part for loudspeaker box
PCT/EP2019/081406 WO2020114750A1 (en) 2018-12-03 2019-11-14 Stiffening part for an audio speaker casing

Publications (1)

Publication Number Publication Date
EP3892010A1 true EP3892010A1 (en) 2021-10-13

Family

ID=66166194

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19802179.2A Pending EP3892010A1 (en) 2018-12-03 2019-11-14 Stiffening part for an audio speaker casing

Country Status (6)

Country Link
US (1) US11245979B1 (en)
EP (1) EP3892010A1 (en)
CN (1) CN113170258A (en)
BR (1) BR112021009754A2 (en)
FR (1) FR3089380B1 (en)
WO (1) WO2020114750A1 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3393764A (en) * 1966-12-27 1968-07-23 Curtiss R. Schafer Loudspeaker systems
DE3414407C2 (en) * 1984-04-17 1986-02-20 Jürgen 6804 Ilvesheim Quaas Arrangement of sound transducers in a sound guide, in particular for loudspeaker boxes
JPH0326714Y2 (en) * 1986-02-24 1991-06-10
US4939783A (en) * 1989-01-30 1990-07-03 Dunning William S Suspended speaker system
FR2746246B1 (en) * 1996-03-14 2002-11-29 ACOUSTIC ENCLOSURE FACILITATING THE EXHAUST OF SOUND PARASITES
JP2001352592A (en) * 2000-06-08 2001-12-21 Fujitsu Ten Ltd Loudspeaker structure
ES2712965T3 (en) * 2001-12-19 2019-05-16 Interdigital Madison Patent Holdings Electronic device comprising a loudspeaker
JP3965366B2 (en) * 2003-03-19 2007-08-29 富士通テン株式会社 Speaker unit support structure and speaker system
GB2424537B (en) * 2003-06-09 2007-09-12 Fujitsu Ten Ltd Speaker apparatus
US7764807B2 (en) * 2007-05-08 2010-07-27 Mitek Corp., Inc Speaker support systems
KR101117078B1 (en) * 2007-10-19 2012-03-13 가즈미치 이마이 Recoilless speaker system
JP2016127404A (en) * 2014-12-26 2016-07-11 富士通テン株式会社 Speaker device and damping unit
US10645484B2 (en) * 2016-12-23 2020-05-05 Tadeusz Kwolek Loudspeaker cabinets, systems, and methods of construction

Also Published As

Publication number Publication date
FR3089380B1 (en) 2020-11-20
FR3089380A1 (en) 2020-06-05
WO2020114750A1 (en) 2020-06-11
BR112021009754A2 (en) 2021-08-17
CN113170258A (en) 2021-07-23
US20220021967A1 (en) 2022-01-20
US11245979B1 (en) 2022-02-08

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