WO2024115710A1 - Headrest for a motor vehicle seat - Google Patents

Headrest for a motor vehicle seat Download PDF

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Publication number
WO2024115710A1
WO2024115710A1 PCT/EP2023/083846 EP2023083846W WO2024115710A1 WO 2024115710 A1 WO2024115710 A1 WO 2024115710A1 EP 2023083846 W EP2023083846 W EP 2023083846W WO 2024115710 A1 WO2024115710 A1 WO 2024115710A1
Authority
WO
WIPO (PCT)
Prior art keywords
headrest
plate
support block
decoupling means
headrest according
Prior art date
Application number
PCT/EP2023/083846
Other languages
French (fr)
Inventor
Xavier Bonfils
Eric Brillon
Arnaud Duval
Original Assignee
Treves Products, Services & Innovation
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 Treves Products, Services & Innovation filed Critical Treves Products, Services & Innovation
Publication of WO2024115710A1 publication Critical patent/WO2024115710A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
    • B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
    • B60N2/80—Head-rests
    • B60N2/879—Head-rests with additional features not related to head-rest positioning, e.g. heating or cooling devices or loudspeakers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R5/00—Stereophonic arrangements
    • H04R5/02—Spatial or constructional arrangements of loudspeakers
    • H04R5/023—Spatial or constructional arrangements of loudspeakers in a chair, pillow
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2499/00—Aspects covered by H04R or H04S not otherwise provided for in their subgroups
    • H04R2499/10—General applications
    • H04R2499/13—Acoustic transducers and sound field adaptation in vehicles
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R7/00—Diaphragms for electromechanical transducers; Cones
    • H04R7/02—Diaphragms for electromechanical transducers; Cones characterised by the construction
    • H04R7/04—Plane diaphragms

Definitions

  • the invention relates to a motor vehicle seat headrest, as well as an assembly for generating acoustic waves in a motor vehicle passenger compartment comprising such a headrest.
  • the generator can emit an “anti-noise” type sound signal, that is to say in phase opposition with the noises from inside the passenger compartment, in order to allow active control of the cabin noise.
  • At least one speaker can be integrated into the volume of the headrest.
  • the size of a speaker makes it difficult to accommodate in a small room such as a headrest, and its weight significantly increases the headrest that is equipped with it.
  • the speakers fitted to the headrests emit at medium frequency and/or high frequency but, for reasons of size, cannot emit at frequencies lower than 150 Hz, whereas these low frequencies, in particular frequencies of 100 Hz or even 60 Hz, are necessary for the quality of a sound signal, particularly of the “anti-noise” type.
  • Acoustic wave generators comprising a rigid plate which is vibrated by an electrodynamic transducer in order to generate said waves.
  • the transducer makes it possible to transform an electrical control signal into an acoustic signal using the plate on which it is fixed as a radiation surface. Due to its compactness, this solution makes it possible to limit the problem of bulkiness of the acoustic wave generator to be integrated into a headrest, but generates a significant problem of transmission of vibrations to said headrest, which can be a source of discomfort in the environment of said headrest, in particular for the passenger seated on the seat which is equipped with it.
  • the aim of the invention is to provide a headrest making it possible to overcome these drawbacks, in particular the transmission of vibrations between the headrest and the seat on which it is mounted.
  • the invention proposes a headrest for a motor vehicle seat, said headrest comprising a support block provided with an elastically compressible foam padding cushion, said block being carried by a rigid frame for mounting said headrest at the top of the backrest of said seat, said headrest being equipped with an acoustic wave generator in the environment of said headrest, the generator comprising at least one plate on which is associated an electrodynamic transducer, said plate being fixed on the support block while being arranged to be excited into vibration by said transducer in order to generate the acoustic waves, said headrest comprising a vibration decoupling means which is arranged between said plate and said support block and/or between said support block and the rigid frame, said decoupling means comprising an elastomeric material whose Young's modulus E is less than 20 kPa.
  • the invention proposes an assembly for generating acoustic waves in a passenger compartment of a motor vehicle, said assembly comprising such a headrest and a system for controlling at least one transducer to excite the plate on the plate into vibration. with which he is associated.
  • FIG.1 is a schematic perspective representation seen from the front of a headrest according to one embodiment of the invention.
  • FIG.2 is a schematic exploded perspective view seen from the front of the headrest of Figure 1;
  • FIG.3 is a schematic representation in horizontal section of the headrest in Figure 1.
  • a motor vehicle seat headrest is described below, as well as an assembly for generating acoustic waves in a motor vehicle passenger compartment which includes such a headrest.
  • the headrest comprises a support block 1 provided with a padding cushion 2 made of elastically compressible foam, said block being carried by a rigid frame 3 for mounting said headrest at the top of the backrest of a vehicle seat automobile (not shown).
  • the mounting frame 3 may comprise at least one rod 4, in particular made of metallic material, which is fitted into a conduit 5 formed in the support block 1.
  • the support block 1 may comprise a casing, in particular made of molded plastic material, for absorbing energy in the event of impact of an occupant's head, which is surrounded by the padding cushion 2, the conduit 5 being formed in said casing.
  • the mounting frame 3 has an inverted U-shaped geometry, the branches of which form two rods 4 which are each fitted into a conduit 5 formed in the support block 1.
  • the cushion 2 can be in the form of a block of molded skin foam, the skin of which is placed on the outside, said foam having a hardness greater than 25 shore A, and in particular of the order of 30 shore A .
  • the foam of the support block 1 can also have a density of between 0.20 and 0.30, and in particular of the order of 0.25.
  • the headrest is equipped with an acoustic wave generator in the environment of said headrest, the generator comprising at least one plate 6 on which an electrodynamic transducer 7 is associated.
  • the plate 6 is fixed on the support block 1 by being arranged to be excited into vibration by the transducer 7, in order to generate the acoustic waves.
  • the assembly for generating acoustic waves in the passenger compartment includes a system for controlling the transducer 7 to excite the vibration of the plate 6 on which it is associated.
  • the headrest comprises two generators arranged laterally on either side of the support block 1, each comprising a transducer 7 associated with respectively a plate 6 to excite it into vibration, so as to to generate acoustic waves on each side of the head of a seat occupant.
  • control system is arranged to control each of the two transducers 7, jointly or independently.
  • the padding cushion 2 is provided with two cavities 8 arranged laterally on either side of the support block 1, and in each of which a plate 6 is fixed by its periphery to said padding cushion.
  • the plates 6 each have a Young's modulus E greater than 10 MPa, in particular between 100 MPa and 1 GPa, in order to present rigidity sufficiently large to generate acoustic waves without distortion during their vibration excitation by their transducer 7.
  • the headrest comprises a vibration decoupling means which is arranged between said plate and said support block and/or between said support block and the rigid frame 3 .
  • the vibration decoupling means comprises two seals 9 made of elastomeric material which are each interposed between respectively a plate 6 and the padding cushion 2, each surrounding the periphery of said plate.
  • the headrest also comprises a vibration decoupling means arranged between the support block 1 and the rigid frame 3, in order to avoid propagation of vibrations at the level of mounting of said support block. support on said frame, and thus a propagation of said vibrations from said frame to the seat back.
  • this second decoupling means comprises two sleeves 10 made of elastomeric material which each respectively equip a rod 4, so as to be interposed between said rod and its mounting conduit 5 in the support block 1.
  • Each decoupling means 9, 10 comprises an elastomeric material whose Young's modulus E is less than 20 kPa, in order to present sufficient flexibility to decouple the vibrating plate 6 from the support cushion (for the joints 9) or to decouple said support cushion from the frame 3 (for the sleeves 10).
  • the great flexibility of the material allows particularly effective vibration decoupling at low frequencies, notably below 150 Hz, even 100 Hz and even up to 60 Hz.
  • the flexibility of the elastomeric material is adapted to allow the decoupling means 9, 10 to withstand the mechanical stresses required for the headrest in the event of an impact on it from the head of the occupant of the seat.
  • the elastomeric material is preferably based on foam, in particular polyurethane (PU) foam or EPDM rubber foam (for “ethylene-propylene-diene monomer”).
  • PU polyurethane
  • EPDM rubber foam for “ethylene-propylene-diene monomer”.
  • the elastomeric material of the decoupling means 9, 10 has an ETA loss factor which is greater than 0.2 in order to optimize its decoupling function.
  • the foam of the cushion 2 has a flexibility adapted to contribute to the vibration decoupling between the support block 1 and the plates 6, while having sufficient rigidity to ensure the maintenance of said plates in their respective cavities 8.
  • the foam of cushion 2 has a Young's modulus E greater than 20 kPa allowing vibrational decoupling at medium and high frequencies.
  • the support block 1 can also be fitted with an appearance layer (not shown), in particular for aesthetic reasons and to conceal and/or protect the acoustic wave generators.

Landscapes

  • Engineering & Computer Science (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Seats For Vehicles (AREA)

Abstract

The invention relates to a headrest comprising a bearing block (1) provided with a padding cushion (2) made of elastically compressible foam, supported by a rigid frame (3) for mounting the headrest at the top of the backrest of the seat, the headrest being equipped with an acoustic wave generator which comprises at least one plate (6) on which an electrodynamic transducer (7) is provided, the plate being attached to the bearing block (1) and being arranged to be excited vibrationally by the transducer in order to generate the acoustic waves, the headrest comprising a vibrational decoupling means (9, 10) which is arranged between the plate and the bearing block and/or between the bearing block and the rigid frame (3), the decoupling means comprising an elastomer material having a Young's modulus E of less than 20 kPa.

Description

DESCRIPTION DESCRIPTION
Titre : Appui-tête de siège de véhicule automobile Title: Motor vehicle seat headrest
L’invention concerne un appui-tête de siège de véhicule automobile, ainsi qu’un ensemble de génération d’ondes acoustiques dans un habitacle de véhicule automobile comprenant un tel appui-tête. The invention relates to a motor vehicle seat headrest, as well as an assembly for generating acoustic waves in a motor vehicle passenger compartment comprising such a headrest.
Il est connu d’équiper un appui-tête avec un générateur d’ondes acoustiques permettant d’émettre un signal sonore à proximité de la tête d’un occupant du siège sur lequel ledit appui-tête est monté. Les ondes sont alors générées au plus près des oreilles de l’utilisateur afin de limiter les déperditions acoustiques. It is known to equip a headrest with an acoustic wave generator making it possible to emit a sound signal near the head of an occupant of the seat on which said headrest is mounted. The waves are then generated as close as possible to the user's ears in order to limit acoustic losses.
Outre un signal audible, le générateur peut émettre un signal sonore de type « anti-bruit », c'est-à-dire en opposition de phase avec les bruits de l’intérieur de l’habitacle, afin de permettre un contrôle actif du bruit habitacle. In addition to an audible signal, the generator can emit an “anti-noise” type sound signal, that is to say in phase opposition with the noises from inside the passenger compartment, in order to allow active control of the cabin noise.
Pour ce faire, au moins un haut-parleur peut être intégré dans le volume de l’appui-tête. Cependant, la taille d’un haut-parleur le rend difficilement logeable dans une pièce de taille réduite telle qu’un appui-tête, et son poids alourdit de façon notable l’appui-tête qui en est équipé. To do this, at least one speaker can be integrated into the volume of the headrest. However, the size of a speaker makes it difficult to accommodate in a small room such as a headrest, and its weight significantly increases the headrest that is equipped with it.
En outre, les haut-parleurs équipant les appui-têtes émettent à moyenne fréquence et/ou à haute fréquence mais, pour des raisons de taille, ne peuvent pas émettre à des fréquences inférieures à 150 Hz, alors que ces basses fréquences, notamment des fréquences de 100 Hz voire 60 Hz, sont nécessaires pour la qualité d’un signal sonore en particulier de type « anti-bruit ». In addition, the speakers fitted to the headrests emit at medium frequency and/or high frequency but, for reasons of size, cannot emit at frequencies lower than 150 Hz, whereas these low frequencies, in particular frequencies of 100 Hz or even 60 Hz, are necessary for the quality of a sound signal, particularly of the “anti-noise” type.
On connaît des générateurs d’ondes acoustiques comprenant une plaque rigide qui est excitée en vibration par un transducteur électrodynamique afin de générer lesdites ondes. Ainsi, le transducteur permet de transformer un signal électrique de commande en un signal acoustique en utilisant comme surface de rayonnement la plaque sur laquelle il est fixé. De par sa compacité, cette solution permet de limiter le problème d’encombrement du générateur d’ondes acoustiques à intégrer dans un appui- tête, mais génère un problème important de transmission des vibrations audit appui-tête, qui peut être source d’inconfort dans l’environnement dudit appui-tête, notamment pour le passager assis sur le siège qui en est équipé. Acoustic wave generators are known comprising a rigid plate which is vibrated by an electrodynamic transducer in order to generate said waves. Thus, the transducer makes it possible to transform an electrical control signal into an acoustic signal using the plate on which it is fixed as a radiation surface. Due to its compactness, this solution makes it possible to limit the problem of bulkiness of the acoustic wave generator to be integrated into a headrest, but generates a significant problem of transmission of vibrations to said headrest, which can be a source of discomfort in the environment of said headrest, in particular for the passenger seated on the seat which is equipped with it.
L’invention a pour but de proposer un appui-tête permettant de pallier ces inconvénients, notamment de transmission des vibrations entre l’appui-tête et le siège sur lequel il est monté. The aim of the invention is to provide a headrest making it possible to overcome these drawbacks, in particular the transmission of vibrations between the headrest and the seat on which it is mounted.
A cet effet, selon un premier aspect, l’invention propose un appui-tête de siège de véhicule automobile, ledit appui-tête comprenant un bloc d’appui pourvu d’un coussin de rembourrage en mousse élastiquement compressible, ledit bloc étant porté par une armature rigide de montage dudit appui-tête en haut de dossier dudit siège, ledit appui-tête étant équipé d’un générateur d’ondes acoustiques dans l’environnement dudit appui-tête, le générateur comprenant au moins une plaque sur laquelle est associé un transducteur électrodynamique, ladite plaque étant fixée sur le bloc d’appui en étant agencée pour être excitée en vibration par ledit transducteur afin de générer les ondes acoustiques, ledit appui-tête comprenant un moyen de découplage vibratoire qui est disposé entre ladite plaque et ledit bloc d’appui et/ou entre ledit bloc d’appui et l’armature rigide, ledit moyen de découplage comprenant un matériau élastomère dont le module d’Young E est inférieur à 20 kPa. For this purpose, according to a first aspect, the invention proposes a headrest for a motor vehicle seat, said headrest comprising a support block provided with an elastically compressible foam padding cushion, said block being carried by a rigid frame for mounting said headrest at the top of the backrest of said seat, said headrest being equipped with an acoustic wave generator in the environment of said headrest, the generator comprising at least one plate on which is associated an electrodynamic transducer, said plate being fixed on the support block while being arranged to be excited into vibration by said transducer in order to generate the acoustic waves, said headrest comprising a vibration decoupling means which is arranged between said plate and said support block and/or between said support block and the rigid frame, said decoupling means comprising an elastomeric material whose Young's modulus E is less than 20 kPa.
Selon un second aspect, l’invention propose un ensemble de génération d’ondes acoustiques dans un habitacle de véhicule automobile, ledit ensemble comprenant un tel appui-tête et un système de commande d’au moins un transducteur pour exciter en vibration la plaque sur laquelle il est associé. According to a second aspect, the invention proposes an assembly for generating acoustic waves in a passenger compartment of a motor vehicle, said assembly comprising such a headrest and a system for controlling at least one transducer to excite the plate on the plate into vibration. with which he is associated.
D’autres particularités et avantages de l’invention apparaîtront dans la description qui suit, faite en référence aux figures annexées, dans lesquelles : [Fig.1] est une représentation schématique en perspective vue de l’avant d’un appui-tête selon un mode de réalisation de l’invention ; Other features and advantages of the invention will appear in the description which follows, made with reference to the appended figures, in which: [Fig.1] is a schematic perspective representation seen from the front of a headrest according to one embodiment of the invention;
[Fig.2] est une représentation schématique en perspective éclatée vue de l’avant de l’appui-tête de la figure 1 ; [Fig.2] is a schematic exploded perspective view seen from the front of the headrest of Figure 1;
[Fig.3] est une représentation schématique en coupe horizontale de l’appui-tête de la figure 1. [Fig.3] is a schematic representation in horizontal section of the headrest in Figure 1.
En relation avec ces figures, on décrit ci-dessous un appui-tête de siège de véhicule automobile, ainsi qu’un ensemble de génération d’ondes acoustiques dans un habitacle de véhicule automobile qui comprend un tel appui-tête. In relation to these figures, a motor vehicle seat headrest is described below, as well as an assembly for generating acoustic waves in a motor vehicle passenger compartment which includes such a headrest.
Dans cette description, les termes de positionnement dans l’espace (latéral, transversal, haut, arrière, ...) sont pris en référence à l’appui-tête disposé dans le véhicule en situation d’utilisation. In this description, the terms of positioning in space (lateral, transverse, top, rear, etc.) are taken with reference to the headrest placed in the vehicle in use.
L’appui-tête comprend un bloc d’appui 1 pourvu d’un coussin de rembourrage 2 en mousse élastiquement compressible, ledit bloc étant porté par une armature rigide 3 de montage dudit appui-tête en haut de dossier d’un siège de véhicule automobile (non représenté). The headrest comprises a support block 1 provided with a padding cushion 2 made of elastically compressible foam, said block being carried by a rigid frame 3 for mounting said headrest at the top of the backrest of a vehicle seat automobile (not shown).
L’armature de montage 3 peut comprendre au moins une tige 4, notamment en matériau métallique, qui est emboîtée dans un conduit 5 formé dans le bloc d’appui 1. The mounting frame 3 may comprise at least one rod 4, in particular made of metallic material, which is fitted into a conduit 5 formed in the support block 1.
En particulier, le bloc d’appui 1 peut comprendre un carter, notamment en matériau plastique moulé, d’absorption d’énergie en cas de choc de la tête d’un occupant, qui est entouré du coussin de rembourrage 2, le conduit 5 étant formé dans ledit carter. In particular, the support block 1 may comprise a casing, in particular made of molded plastic material, for absorbing energy in the event of impact of an occupant's head, which is surrounded by the padding cushion 2, the conduit 5 being formed in said casing.
Dans le mode de réalisation représenté, l’armature de montage 3 présente une géométrie en forme de U renversé, dont les branches forment deux tiges 4 qui sont chacune emboîtée dans respectivement un conduit 5 formé dans le bloc d’appui 1. Le coussin 2 peut se présenter sous la forme d’un bloc de mousse à peau moulée, dont la peau est disposée à l’extérieur, ladite mousse présentant une dureté supérieure à 25 shore A, et notamment de l’ordre de 30 shore A. In the embodiment shown, the mounting frame 3 has an inverted U-shaped geometry, the branches of which form two rods 4 which are each fitted into a conduit 5 formed in the support block 1. The cushion 2 can be in the form of a block of molded skin foam, the skin of which is placed on the outside, said foam having a hardness greater than 25 shore A, and in particular of the order of 30 shore A .
La mousse du bloc d’appui 1 peut également présenter une densité comprise entre 0,20 et 0,30, et notamment de l’ordre de 0,25. The foam of the support block 1 can also have a density of between 0.20 and 0.30, and in particular of the order of 0.25.
L’appui-tête est équipé d’un générateur d’ondes acoustiques dans l’environnement dudit appui-tête, le générateur comprenant au moins une plaque 6 sur laquelle est associé un transducteur électrodynamique 7. The headrest is equipped with an acoustic wave generator in the environment of said headrest, the generator comprising at least one plate 6 on which an electrodynamic transducer 7 is associated.
La plaque 6 est fixée sur le bloc d’appui 1 en étant agencée pour être excitée en vibration par le transducteur 7, afin de générer les ondes acoustiques. L’ensemble de génération d’ondes acoustiques dans l’habitacle comprend un système de commande du transducteur 7 pour exciter en vibration la plaque 6 sur laquelle il est associé. The plate 6 is fixed on the support block 1 by being arranged to be excited into vibration by the transducer 7, in order to generate the acoustic waves. The assembly for generating acoustic waves in the passenger compartment includes a system for controlling the transducer 7 to excite the vibration of the plate 6 on which it is associated.
Dans le mode de réalisation représenté, l’appui-tête comprend deux générateurs disposés latéralement de part et d’autre du bloc d’appui 1 , chacun comprenant un transducteur 7 associé à respectivement une plaque 6 pour l’exciter en vibration, de manière à générer des ondes acoustiques de chaque côté de la tête d’un occupant du siège. In the embodiment shown, the headrest comprises two generators arranged laterally on either side of the support block 1, each comprising a transducer 7 associated with respectively a plate 6 to excite it into vibration, so as to to generate acoustic waves on each side of the head of a seat occupant.
Par ailleurs, le système de commande est agencé pour piloter chacun des deux transducteurs 7, de manière conjointe ou indépendante. Furthermore, the control system is arranged to control each of the two transducers 7, jointly or independently.
Le coussin de rembourrage 2 est pourvu de deux cavités 8 disposées latéralement de part et d’autre du bloc d’appui 1 , et dans chacune desquelles une plaque 6 est fixée par sa périphérie audit coussin de rembourrage. The padding cushion 2 is provided with two cavities 8 arranged laterally on either side of the support block 1, and in each of which a plate 6 is fixed by its periphery to said padding cushion.
Les plaques 6 présentent chacune un module d’Young E supérieur à 10 MPa, notamment compris entre 100 MPa et 1 GPa, afin de présenter une rigidité suffisamment importante pour générer les ondes acoustiques sans déformation lors de leur excitation en vibration par leur transducteur 7. The plates 6 each have a Young's modulus E greater than 10 MPa, in particular between 100 MPa and 1 GPa, in order to present rigidity sufficiently large to generate acoustic waves without distortion during their vibration excitation by their transducer 7.
Pour éviter la transmission des vibrations générées par la plaque 6, l’appui-tête comprend un moyen de découplage vibratoire qui est disposé entre ladite plaque et ledit bloc d’appui et/ou entre ledit bloc d’appui et l’armature rigide 3. To avoid the transmission of vibrations generated by the plate 6, the headrest comprises a vibration decoupling means which is arranged between said plate and said support block and/or between said support block and the rigid frame 3 .
En particulier, le moyen de découplage vibratoire comprend deux joints 9 en matériau élastomère qui sont interposés chacun entre respectivement une plaque 6 et le coussin de rembourrage 2 en entourant chacun la périphérie de ladite plaque. In particular, the vibration decoupling means comprises two seals 9 made of elastomeric material which are each interposed between respectively a plate 6 and the padding cushion 2, each surrounding the periphery of said plate.
Dans le mode de réalisation représenté, l’appui-tête comprend également un moyen de découplage vibratoire disposé entre le bloc d’appui 1 et l’armature rigide 3, afin d’éviter une propagation des vibrations au niveau du montage dudit bloc d’appui sur ladite armature, et ainsi une propagation desdites vibrations de ladite armature au dossier du siège. In the embodiment shown, the headrest also comprises a vibration decoupling means arranged between the support block 1 and the rigid frame 3, in order to avoid propagation of vibrations at the level of mounting of said support block. support on said frame, and thus a propagation of said vibrations from said frame to the seat back.
Pour ce faire, ce second moyen de découplage comprend deux manchons 10 en matériau élastomère qui équipent chacun respectivement une tige 4, de manière à être interposé entre ladite tige et son conduit 5 de montage dans le bloc d’appui 1. To do this, this second decoupling means comprises two sleeves 10 made of elastomeric material which each respectively equip a rod 4, so as to be interposed between said rod and its mounting conduit 5 in the support block 1.
Chaque moyen de découplage 9, 10 comprend un matériau élastomère dont le module d’Young E est inférieur à 20 kPa, afin de présenter une souplesse suffisamment importante pour découpler la plaque vibratoire 6 du coussin d’appui (pour les joints 9) ou pour découpler ledit coussin d’appui de l’armature 3 (pour les manchons 10). En particulier, la grande souplesse du matériau permet un découplage vibratoire particulièrement efficace à basse fréquence, notamment inférieure à 150 Hz, voire 100 Hz et même jusqu’à 60 Hz. En outre, la souplesse du matériau élastomère est adaptée pour permettre aux moyens de découplage 9, 10 de tenir les contraintes mécaniques requises pour l’appui-tête en cas de choc sur lui de la tête de l’occupant du siège. Each decoupling means 9, 10 comprises an elastomeric material whose Young's modulus E is less than 20 kPa, in order to present sufficient flexibility to decouple the vibrating plate 6 from the support cushion (for the joints 9) or to decouple said support cushion from the frame 3 (for the sleeves 10). In particular, the great flexibility of the material allows particularly effective vibration decoupling at low frequencies, notably below 150 Hz, even 100 Hz and even up to 60 Hz. In addition, the flexibility of the elastomeric material is adapted to allow the decoupling means 9, 10 to withstand the mechanical stresses required for the headrest in the event of an impact on it from the head of the occupant of the seat.
Le matériau élastomère est de préférence à base de mousse, notamment une mousse de polyuréthanne (PU) ou une mousse de caoutchouc EPDM (pour « éthylène-propylène-diène monomère »). The elastomeric material is preferably based on foam, in particular polyurethane (PU) foam or EPDM rubber foam (for “ethylene-propylene-diene monomer”).
Par ailleurs, le matériau élastomère des moyens de découplage 9, 10 présente un facteur de perte ETA qui est supérieur à 0,2 afin d’optimiser sa fonction de découplage. Furthermore, the elastomeric material of the decoupling means 9, 10 has an ETA loss factor which is greater than 0.2 in order to optimize its decoupling function.
De façon avantageuse, la mousse du coussin 2 présente une souplesse adaptée pour contribuer au découplage vibratoire entre le bloc d’appui 1 et les plaques 6, tout en présentant une rigidité suffisante pour assurer le maintien desdites plaques dans leurs cavités 8 respectives. En particulier, la mousse du coussin 2 présente un module d’Young E supérieur à 20 kPa permettant un découplage vibratoire à moyenne et à haute fréquence. Advantageously, the foam of the cushion 2 has a flexibility adapted to contribute to the vibration decoupling between the support block 1 and the plates 6, while having sufficient rigidity to ensure the maintenance of said plates in their respective cavities 8. In particular, the foam of cushion 2 has a Young's modulus E greater than 20 kPa allowing vibrational decoupling at medium and high frequencies.
Le bloc d’appui 1 peut par ailleurs être chaussé d’une couche d’aspect (non représentée), notamment pour des raisons esthétiques et pour dissimuler et/ou protéger les générateurs d’ondes acoustiques. The support block 1 can also be fitted with an appearance layer (not shown), in particular for aesthetic reasons and to conceal and/or protect the acoustic wave generators.

Claims

REVENDICATIONS
1. Appui-tête de siège de véhicule automobile, ledit appui-tête comprenant un bloc d’appui (1 ) pourvu d’un coussin de rembourrage (2) en mousse élastiquement compressible, ledit bloc étant porté par une armature rigide (3) de montage dudit appui-tête en haut de dossier dudit siège, ledit appui-tête étant équipé d’un générateur d’ondes acoustiques dans l’environnement dudit appui- tête, ledit appui-tête étant caractérisé en ce que le générateur comprend au moins une plaque (6) sur laquelle est associé un transducteur électrodynamique (7), ladite plaque étant fixée sur le bloc d’appui (1) en étant agencée pour être excitée en vibration par ledit transducteur afin de générer les ondes acoustiques, ledit appui-tête comprenant un moyen de découplage vibratoire (9, 10) qui est disposé entre ladite plaque et ledit bloc d’appui et/ou entre ledit bloc d’appui et l’armature rigide (3), ledit moyen de découplage comprenant un matériau élastomère dont le module d’Young E est inférieur à 20 kPa. 1. Motor vehicle seat headrest, said headrest comprising a support block (1) provided with a padding cushion (2) made of elastically compressible foam, said block being supported by a rigid frame (3) mounting said headrest at the top of the backrest of said seat, said headrest being equipped with an acoustic wave generator in the environment of said headrest, said headrest being characterized in that the generator comprises at least a plate (6) on which is associated an electrodynamic transducer (7), said plate being fixed on the support block (1) being arranged to be excited into vibration by said transducer in order to generate the acoustic waves, said support- head comprising vibration decoupling means (9, 10) which is arranged between said plate and said support block and/or between said support block and the rigid frame (3), said decoupling means comprising an elastomeric material whose Young E modulus is less than 20 kPa.
2. Appui-tête selon la revendication 1 , caractérisé en ce que le matériau élastomère du moyen de découplage (9, 10) présente un facteur de perte ETA qui est supérieur à 0,2. 2. Headrest according to claim 1, characterized in that the elastomeric material of the decoupling means (9, 10) has an ETA loss factor which is greater than 0.2.
3. Appui-tête selon l’une des revendications 1 ou 2, caractérisé en ce qu’il comprend deux générateurs disposés latéralement de part et d’autre du bloc d'appui (1), de manière à générer des ondes acoustiques de chaque côté de la tête d’un occupant du siège. 3. Headrest according to one of claims 1 or 2, characterized in that it comprises two generators arranged laterally on either side of the support block (1), so as to generate acoustic waves from each side of the head of a seat occupant.
4. Appui-tête selon l'une quelconque des revendications 1 à 3, caractérisé en ce que l’armature de montage (3) comprend au moins une tige (4) qui est emboîtée dans un conduit (5) formé dans le bloc d’appui (1 ), le moyen de découplage vibratoire comprenant un manchon (10) en matériau élastomère qui est interposé entre la tige (4) et le conduit (5). 4. Headrest according to any one of claims 1 to 3, characterized in that the mounting frame (3) comprises at least one rod (4) which is fitted into a conduit (5) formed in the block support (1), the vibration decoupling means comprising a sleeve (10) of elastomeric material which is interposed between the rod (4) and the conduit (5).
5. Appui-tête selon la revendication 4, caractérisé en ce que l’armature de montage (3) comprend deux tiges (4) équipées chacun d’un manchon (10) en matériau élastomère. 5. Headrest according to claim 4, characterized in that the mounting frame (3) comprises two rods (4) each equipped with a sleeve (10) made of elastomeric material.
6. Appui-tête selon l’une quelconque des revendications 1 à 5, caractérisé en ce que la plaque (6) est fixée au coussin de rembourrage (2). 6. Headrest according to any one of claims 1 to 5, characterized in that the plate (6) is fixed to the padding cushion (2).
7. Appui-tête selon la revendication 6, caractérisé en ce que le moyen de découplage vibratoire comprend un joint (9) en matériau élastomère qui est interposé entre la plaque (6) et le coussin de rembourrage (2). 7. Headrest according to claim 6, characterized in that the vibration decoupling means comprises a seal (9) made of elastomeric material which is interposed between the plate (6) and the padding cushion (2).
8. Appui-tête selon la revendication 7, caractérisé en ce que le coussin de rembourrage (2) est pourvu d’au moins une cavité (8) dans laquelle la plaque est fixée par sa périphérie, le joint (9) entourant ladite périphérie. 8. Headrest according to claim 7, characterized in that the padding cushion (2) is provided with at least one cavity (8) in which the plate is fixed by its periphery, the seal (9) surrounding said periphery .
9. Appui-tête selon l’une quelconque des revendications 1 à 8, caractérisé en ce que la plaque (6) présente un module d’Young E qui est supérieur à 10 MPa. 9. Headrest according to any one of claims 1 to 8, characterized in that the plate (6) has a Young modulus E which is greater than 10 MPa.
10. Ensemble de génération d’ondes acoustiques dans un habitacle de véhicule automobile, ledit ensemble comprenant un appui-tête selon l'une quelconque des revendications 1 à 9 et un système de commande d’au moins un transducteur (7) pour exciter en vibration la plaque (6) sur laquelle il est associé. 10. Acoustic wave generation assembly in a motor vehicle passenger compartment, said assembly comprising a headrest according to any one of claims 1 to 9 and a system for controlling at least one transducer (7) to excite in vibration the plate (6) on which it is associated.
PCT/EP2023/083846 2022-12-01 2023-11-30 Headrest for a motor vehicle seat WO2024115710A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FRFR2212641 2022-12-01
FR2212641A FR3142716A1 (en) 2022-12-01 2022-12-01 Motor vehicle seat headrest

Publications (1)

Publication Number Publication Date
WO2024115710A1 true WO2024115710A1 (en) 2024-06-06

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2023/083846 WO2024115710A1 (en) 2022-12-01 2023-11-30 Headrest for a motor vehicle seat

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FR (1) FR3142716A1 (en)
WO (1) WO2024115710A1 (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20180109893A1 (en) * 2016-10-18 2018-04-19 Bdnc (Holding) Limited Hard speaker radiating diaphragms with light-curable voice coil attachment
US20220063467A1 (en) * 2020-09-02 2022-03-03 Continental Engineering Services Gmbh Seating means with actuators for sound emission
US20220201385A1 (en) * 2019-05-23 2022-06-23 Pss Belgium Nv Loudspeaker

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20180109893A1 (en) * 2016-10-18 2018-04-19 Bdnc (Holding) Limited Hard speaker radiating diaphragms with light-curable voice coil attachment
US20220201385A1 (en) * 2019-05-23 2022-06-23 Pss Belgium Nv Loudspeaker
US20220063467A1 (en) * 2020-09-02 2022-03-03 Continental Engineering Services Gmbh Seating means with actuators for sound emission

Also Published As

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