EP4199537A1 - Système composite multicouche comprenant un support textile facultatif doté d'une couche composite de polychlorure de vinyle-polyuréthane comme membrane de haut-parleur à grande largeur de fréquence - Google Patents

Système composite multicouche comprenant un support textile facultatif doté d'une couche composite de polychlorure de vinyle-polyuréthane comme membrane de haut-parleur à grande largeur de fréquence Download PDF

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Publication number
EP4199537A1
EP4199537A1 EP22210933.2A EP22210933A EP4199537A1 EP 4199537 A1 EP4199537 A1 EP 4199537A1 EP 22210933 A EP22210933 A EP 22210933A EP 4199537 A1 EP4199537 A1 EP 4199537A1
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EP
European Patent Office
Prior art keywords
polyvinyl chloride
audio system
polyurethane
composite material
layer
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.)
Granted
Application number
EP22210933.2A
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German (de)
English (en)
Other versions
EP4199537B1 (fr
EP4199537B8 (fr
Inventor
Thorsten Dr. Neumann
Christian Walther
Johannes Kerkmann
Mergim Shala
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.)
Aumovio Engineering Solutions GmbH
Original Assignee
Benecke Kaliko AG
Continental Engineering Services GmbH
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Publication date
Application filed by Benecke Kaliko AG, Continental Engineering Services GmbH filed Critical Benecke Kaliko AG
Publication of EP4199537A1 publication Critical patent/EP4199537A1/fr
Publication of EP4199537B1 publication Critical patent/EP4199537B1/fr
Application granted granted Critical
Publication of EP4199537B8 publication Critical patent/EP4199537B8/fr
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Anticipated expiration legal-status Critical

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; 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
    • H04R7/06—Plane diaphragms comprising a plurality of sections or layers
    • H04R7/10—Plane diaphragms comprising a plurality of sections or layers comprising superposed layers in contact
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R2307/00—Details of diaphragms or cones for electromechanical transducers, their suspension or their manufacture covered by H04R7/00 or H04R31/003, not provided for in any of its subgroups
    • H04R2307/025—Diaphragms comprising polymeric materials
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; 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

Definitions

  • loudspeakers such as those used in car interiors, are built with magnets, a coil and a plastic, paper or metal membrane in a chassis designed for this purpose. Due to the dimensions of these conventional loudspeakers, a certain volume must be maintained in the built-in construction.
  • structure-borne sound converters have also been used to generate sound, in which a sound driver vibrates surfaces that serve as membranes, mostly plastic components, in such a way that these can be used as loudspeaker membranes.
  • a commercial audio system based on this is, for example, Ac2ated Sound ® from Continental AG.
  • Such audio systems based on structure-borne sound converters are significantly lighter than conventional loudspeakers and require significantly less installation space.
  • the frequency bandwidth of systems based on structure-borne sound transducers depends on the surfaces or plastic parts that are excited by the sound driver. In most cases, only high-pitched or low-pitched constructions can be achieved.
  • the audio system should reproduce all frequencies in the audible range (about 20 Hz to 20 kHz) with about the same sound pressure level.
  • EP 2918629131 A1 describes processes for making breathable films from polyvinyl chloride-polyurethane composites and synthetic leather containing these breathable films.
  • the object of the present invention is to provide a material, in particular a surface material, as a membrane for a structure-borne sound transducer, which has improved broadband properties in the audible range.
  • a material in particular a surface material
  • the sound of low, middle and high frequency ranges should be presented as homogeneously as possible.
  • an artificial leather as a membrane, which comprises at least one breathable layer made of a polyvinyl chloride-polyurethane composite material.
  • the composite material has a pore structure, which makes the layer breathable.
  • the invention thus relates to an audio system which comprises at least one structure-borne sound transducer and an artificial leather which serves as a membrane, the artificial leather comprising at least one breathable layer made from a polyvinyl chloride-polyurethane composite material.
  • this audio system has excellent broadband properties.
  • the sound of low, middle and high frequency ranges could be represented relatively homogeneously.
  • the deviations in the sound pressure determined are acceptable for good sound quality in the entire listening area, both in the high-frequency range and in the mid-range as well as in the low-frequency range.
  • prior art surface materials could only cover either the high frequency range or the low frequency range.
  • the actuator could only cover the low-frequency range with membranes made of PVC films and PVC artificial leather, and only the high-frequency range with membranes made of polyurethane artificial leather and foils.
  • perforated materials based on PVC or polyurethane could not achieve the desired broadband properties. For this purpose, micro-perforations as well as standard perforations were examined.
  • the audio system comprises at least one structure-borne sound transducer and an artificial leather serving as a membrane.
  • the audio system can include one or more structure-borne sound transducers. If there is a structure-borne sound transducer, it can be positioned at a suitable point on the artificial leather. If there are two or more structure-borne sound transducers, they are positioned at different points on the artificial leather.
  • Synthetic leather typically forms the surface material, lining or trim material of a component.
  • the at least one structure-borne noise transducer is then located behind or inside the component, so that it is not visible.
  • Structure-borne sound converters are also referred to as exciters.
  • the structure-borne sound converter includes in particular an actuator.
  • the actuator is also referred to as an acoustic actuator or structure-borne noise actuator.
  • the actuator can be an electrodynamic or a piezoelectric actuator.
  • the actuator can convert electrical signals into mechanical deflections. This allows the actuator to vibrate adjacent components to generate sound.
  • the structure-borne sound converter has electrical connections via which it can be connected to an amplifier or audio amplifier, for example, which provides the structure-borne sound converter with audio signals for processing.
  • the amplifier is controlled by at least one audio source, such as an infotainment system or a control device for warning or assistance messages.
  • the imitation leather serving as a membrane is directly or indirectly connected to the structure-borne sound transducer in particular by means of one or more components arranged in between, so that the structure-borne sound generated by the structure-borne sound transducer can be passed on to the artificial leather in order to generate sound.
  • the frequency band generated by the structure-borne sound transducer can preferably cover the entire audible range, e.g. from about 20 Hz to about 20 kHz. However, it is also possible for only a sub-area to be covered.
  • the at least one structure-borne sound transducer can be attached directly to the synthetic leather.
  • at least one component preferably a flat component, can be arranged between the at least one structure-borne sound transducer and the artificial leather.
  • the component that is arranged between the structure-borne sound transducer and the artificial leather can be, for example, a foam material (reticulated or normal), in particular a foam cover or laminating foam, a plastic plate or an actuator holder.
  • a foam material can serve to improve the comfort for the user, for example in the case of headrests.
  • fleece or spacer fabrics can also be used as an intermediate component. However, these should expediently be of high mechanical hardness.
  • the structure-borne sound transducer can be attached to the installation surface, for example by gluing and/or fastening means such as screws, with the installation surface being formed by the artificial leather or the component lying in between.
  • the structure-borne sound converter can optionally also include a plate connected to the actuator for sound radiation.
  • a plate is not required but may be useful for design reasons. For example, it can prevent a visible deflection of the imitation leather during sound reproduction. If necessary, it can also be used to adjust the sound quality.
  • the plate connected to the actuator can be made of plastic, metal or wood, for example, with a plastic plate being preferred.
  • the actuator is attached directly to the synthetic leather.
  • the plate connected to the actuator is attached directly to the synthetic leather.
  • the at least one component, preferably a flat component is arranged between the actuator or the synthetic leather.
  • the at least one component, preferably a flat component is arranged between the plate connected to the actuator and the artificial leather.
  • the structure-borne sound converter includes a mounting element that is used to attach the plate for generating sound to the actuator and/or to attach the structure-borne sound converter to the installation surface.
  • the audio system according to the invention also includes the artificial leather serving as a membrane, which includes at least one breathable layer made of a polyvinyl chloride-polyurethane composite material. One or more such breathable layers may be included.
  • the layer made of a polyvinyl chloride-polyurethane composite material is breathable because it has a pore structure.
  • Polyvinyl chloride-polyurethane composite material has pores (channels) running from one side of the layer to the other. Water vapor can pass through the pores, resulting in breathable properties.
  • the pores preferably have an average pore diameter of 0.1 ⁇ m to 1 mm.
  • the polyvinyl chloride-polyurethane composite breathable layer is a composite having PVC phases and polyurethane phases, each of which may exist as microscopic and/or macroscopic domains.
  • the at least one breathable layer made of polyvinyl chloride-polyurethane composite material preferably has a gas permeability of 0.1 to 200 l dm -2 min -1 .
  • the at least one breathable layer made of polyvinyl chloride-polyurethane composite material preferably has a water vapor permeability of 0.1 to 200 mg cm -2 h -1 .
  • the breathable layer of polyvinyl chloride-polyurethane composite material can have a water impermeability of 0.1 to 60 m 2 pa -1 w -1 .
  • the gas permeability can be determined based on DIN 53887.
  • the water vapor permeability can be determined based on DIN ISO 14268.
  • pores Due to the in-situ generation of the pores during the process, the pores are randomly arranged in the material, both horizontally and vertically. It is found that pores or channels in the polyvinyl chloride-polyurethane composite material are statistically distributed, also with regard to small and large pores.
  • the pores and channels can preferably be randomly aligned in all directions (horizontal and vertical) and thus interact.
  • the at least one breathable layer of polyvinyl chloride-polyurethane composite material preferably contains 98 to 40% by weight polyvinyl chloride and 2 to 60% by weight polyurethane, based on the total weight of polyvinyl chloride and polyurethane in the layer.
  • the at least one breathable layer made of polyvinyl chloride-polyurethane composite material can also contain auxiliary substances and additives, e.g. one or more thermoplastic polyurethanes (TPU), but it can also only consist of polyvinyl chloride and polyurethane.
  • TPU thermoplastic polyurethanes
  • the amounts of auxiliaries and additives that are added can vary within a wide range, depending on requirements and the desired properties, and there are no general restrictions in this respect.
  • the polyvinyl chloride-polyurethane composite material has a total amount of polyvinyl chloride and polyurethane, based on the total weight of the breathable layer made of polyvinyl chloride-polyurethane composite material, of 25 to 100% by weight, preferably 35 to 90% by weight. -%, having. Auxiliaries and additives usually make up the rest.
  • the polyvinyl chloride (PVC) of the polyvinyl chloride-polyurethane composite material preferably comprises or is selected from emulsion PVC with a K value of 65 to 80, preferably 70 to 76, suspension PVC or mixtures thereof.
  • the suspension PVC is preferably pastable suspension PVC, including commercially available microsuspension PVC.
  • the polyurethane of the polyvinyl chloride-polyurethane composite material preferably comprises or is selected from polyether-polyurethane, polyester-polyurethane or polycarbonate-polyurethane or mixtures thereof.
  • auxiliaries and additives can include, for example, fillers, plasticizers, crosslinkers, stabilizers, kickers, silicones, thermoplastic polyurethanes (TPU), flame retardants, additives and/or dyes and pigments. It goes without saying that added auxiliaries and additives, such as crosslinking agents, which can be added to the starting mixture, can undergo reactions during the production of the breathable layer and are then present in a modified form.
  • TPU thermoplastic polyurethanes
  • This polyurethane component can be obtained, for example, by cryomilling processes and preferably has a particle size of less than 100 ⁇ m, preferably less than 80 ⁇ m.
  • the TPU types can be polyester-polyurethanes, polycarbonate-polyurethanes, polyether-polyurethanes and/or mixtures thereof.
  • thermoplastic polyurethane can be aliphatic TPU and/or aromatic TPU. With regard to thermal and yellowing aspects, preference is given to aliphatic TPUs which have a lower tendency to yellow.
  • suitable fillers are calcium carbonate, cellulose, in particular Arbocel types, calcium sulfate, barium sulfate, silicon dioxide such as TS 100, aluminum hydroxide, aluminum oxide, zinc oxide and zinc bromide.
  • pigments are organic or inorganic pigments, metal pigments and iriodine.
  • plasticizers like that of the fillers, are not subject to any general restrictions.
  • suitable plasticizers are phthalates, adipates, sebacates, citrates, diisononyl 1,2-cyclohexanedicarboxylate, non-aromatic cyclic ester compounds such as DINCH, dioctyl terephthalate (DOTP), epoxy plasticizers such as epoxidized soybean oil, oligoglycol- or polyethylene glycol-based plasticizers, castor oil-based plasticizers, polymer plasticizers , phosphate plasticizers, chlorinated and brominated plasticizers, sulfate plasticizers and ionic liquids.
  • crosslinkers examples include isocyanates, aceridines, carbidiimides, melamines and peroxides.
  • stabilizers/kickers are those based on barium, calcium, cadmium, tin, lead, mercury, antimony, arsenic, thiols or mercaptans, phosphites or phosphates, OBS, zinc, magnesium and/or aluminum, as well as sterically hindered and unhindered phenols ( eg Irganox types), UV stabilizers, in particular HALS, nano-titanium oxides, ⁇ -diketones, epoxy-based, perchlorate-based stabilizers and/or amine-based stabilizers.
  • flame retardants are antimony oxide, aluminum oxide, hydrotalcite, magnesium hydroxide, magnesium carbonate, calcium carbonate, zinc borate, various phosphates such as ammonium phosphate, expandable graphite, and brominated and chlorinated plasticizers.
  • silicones are crosslinked, crosslinking and/or non-crosslinking silicones, such as platinum-catalyzed crosslinking silicones or condensation reaction-based crosslinking silicones.
  • Suitable additives are emulsifiers and soaps, defoamers, rheological additives such as thickeners and viscosity reducers, nanotubes and quantum dots.
  • the at least one breathable layer of polyvinyl chloride-polyurethane composite material can have a basis weight in the range of 10 to 2000 g/m 2 , preferably 50 to 1000 g/m 2 , more preferably 120 to 500 g/m 2 .
  • PVC, polyurethane and optionally one or more auxiliaries and additives can be blended, dispersed and/or mixed with one another as described above to provide the pasty mass.
  • PVC can be added, for example, in the form of a PVC paste.
  • An aqueous polyurethane dispersion, for example, is suitable for the polyurethane. Water can be added to the paste as needed.
  • Water e.g. from the polyurethane dispersion or added separately, can serve to adjust the viscosity of the pasty mass.
  • This aqueous component has a positive effect on the formation of pores during the drying of the pasty mass to form a breathable film.
  • the pasty mass is dried on the base simply by supplying heat, possibly reacted and gelled.
  • the film is formed in the process, with the pores for producing the breathable property of the film also being formed in situ during the formation of the film.
  • the automatic or self-organizing formation of pores during the drying and gelling of the pasty mass under the application of heat results from the fact that the pasty mass is composed of fractions that are chemically incompatible per se, namely PVC and polyurethane.
  • the polyurethane in the pasty mass has only a low, almost zero, wettability.
  • cracks and/or cavities form at the respective phase or grain boundaries of these incompatible fractions, which run continuously from one surface of the film to the other, thus forming pores in the film.
  • the pore size and the resulting breathability can be set within wide limits, e.g.
  • the method makes it possible to produce a breathable film which, with the exception of water, is produced without solvent, since according to the invention the pasty mass can be formed without adding an organic solvent.
  • a breathable film with a compact, i.e. non-foamed structure, or with a foam structure, for which e.g. additional blowing agents are added, e.g. blowing agents on a physical basis (e.g. Expancell) or chemical basis (e.g. OBSH or azodicarbonamide).
  • the compact film has the above pore structure.
  • the foam structure can be produced by producing a whipped foam from the pasty mass before it is applied to the substrate.
  • blowing agents such as azodicarbonamide, microspheres such as Expancell, silica gel, sodium carbonate, disodium carbonate, OBSH, zeolites and the like can be added to the pasty mass as auxiliary or additives, which form the cell structure of the foam during drying and gelling.
  • the pasty mass can be applied to the substrate, for example, by means of a reverse or roll coater or by squeegeeing, spraying, pouring or printing.
  • the application can be repeated one or more times, as long as a drying step has taken place in the previous layer. If there is more than one breathable layer of polyvinyl chloride-polyurethane composite in the synthetic leather, the layers can also be made independently and then laminated together.
  • the drying and gelling of the pasty mass to form the porous film preferably takes place at temperatures of 100.degree. C. to 220.degree.
  • the pasty mass after being applied to the substrate, is guided together with the substrate through a drying oven or hardening oven, which can have a length of 1 to 80 m and a speed of 2 to 80 m/min to ensure a sufficient drying time .
  • the backing can be peeled off from the film after it has formed.
  • the base for this for example, an unembossed or embossed paper, a forming polymer/plastic mold, a corresponding tape or a steel embossing mold.
  • a substrate as a base which remains on the film after it has been formed, in particular a textile carrier as part of a composite for the production of an artificial leather.
  • the pasty mass applied can be applied directly to the textile backing, for example by means of direct coating, and subjected to the supply of heat together with it, whereupon the pasty mass dries and gels on the textile backing or another suitable substrate, the layer of the breathable film forms and with the base remains connected in the form of the substrate to form a multi-layer composite.
  • the imitation leather used in the audio system according to the invention can also comprise a single-layer or multi-layer lacquer layer as a top layer.
  • the lacquer layer can consist of one or more identical or different lacquer layers, which can have different functions.
  • the lacquer layer is arranged over the at least one breathable layer of a polyvinyl chloride-polyurethane composite material, i.e. it is on the visible side of the artificial leather when it is used.
  • the lacquer layer can give the artificial leather e.g. haptics and gloss (via the single-layer lacquer layer or the uppermost lacquer layer), abrasion resistance, color (by means of pigments in the lacquer layer or lacquer layer) and/or adhesion to the composite material (via the single-layer lacquer layer or via the bottom layer of paint).
  • suitable lacquers for the lacquer layer or lacquer layers are lacquers based on polyurethane, acrylate, PVC, PVDF, aniline, epoxy or polyamide-polyester.
  • the synthetic leather used in the audio system according to the invention can also include at least one carrier.
  • the at least one carrier is preferably a textile carrier.
  • one or more textile carriers can usually be laminated into the artificial leather, for example as described above.
  • textile carriers are a woven fabric, a fleece, a grid.
  • the fibers used for the textile backing can be organic or inorganic, such as polyester, rock wool, glass and carbon fibers.
  • the artificial leather used in the audio system according to the invention can optionally also comprise at least one foam layer, e.g. an acoustic foam, but this is generally not preferred.
  • the foam layer or the acoustic foam can usually be laminated into the artificial leather.
  • the imitation leather can also have an applied surface embossing in the form of a leather grain structure in the area of its visible side.
  • the artificial leather of the audio system according to the invention can optionally contain a lacquer layer as a cover layer, one or more textile carriers and/or foams. It is preferred that the synthetic leather does not otherwise contain any further layers, e.g., plastic layers of a material different from the PVC-PUR composite.
  • Suitable breathable layers and films of polyvinyl chloride-polyurethane composite material and artificial leather and methods for their manufacture are also in US Pat EP 2918629 A1 described. Reference is made to the information contained there, which is hereby incorporated by reference.
  • a synthetic leather suitable for the audio system according to the invention, as described above, is commercially available from ContiTech AG under the laif® VyP brand.
  • the audio system according to the invention can be part of a component in the field of transport, in particular in the automotive sector, indoors, e.g. furniture, mobility, such as trains, planes or boats or in industry (LivTec) be, especially as a decorative reference material.
  • the audio system according to the invention can particularly preferably be part of a component of a motor vehicle, in particular in the interior of a motor vehicle or automobile.
  • the artificial leather of the audio system according to the invention can be, for example, a covering material or an interior lining of a component, in particular a component of a motor vehicle or automobile, the component preferably being a headrest, a dashboard, a seat, a door, a vehicle pillar, a center console or a headliner .
  • the artificial leather of the audio system according to the invention can also be, for example, a cover material or an interior lining of a component in the industrial sector (Livtec), e.g. furniture, chairs, wall coverings, ceiling coverings, cupboards, bed tops, e.g. in ships, airplanes, trains or buses.
  • a component in the industrial sector Livtec
  • furniture, chairs, wall coverings, ceiling coverings, cupboards, bed tops e.g. in ships, airplanes, trains or buses.
  • audio systems can be built directly into the seat surface of the armchair, car seat or headrest.
  • the artificial leather covers the audio system and is not visible (Shy-Tech) to the user. There is no need for additional space, e.g. in the doors.
  • this close-to-the-body sound generation also achieves greater precision.
  • the invention also relates to a motor vehicle that has one or more audio systems according to the invention as described above.
  • the invention also relates to the use of an artificial leather, comprising at least one breathable layer made of a polyvinyl chloride-polyurethane composite material, as a membrane for a structure-borne sound transducer.
  • an artificial leather comprising at least one breathable layer made of a polyvinyl chloride-polyurethane composite material, as a membrane for a structure-borne sound transducer.
  • the use according to the invention is preferably carried out in an audio system according to the invention as described above.
  • FIGS. 1a and 1b each show a sectional image of a breathable layer made of a polyvinyl chloride-polyurethane composite material on a textile support for the artificial leather of the audio system according to the invention, which is obtained by the method described.
  • the black areas represent the pores while the whitish areas represent the composite.
  • the textile backing can be seen in the lower area.
  • the following recipe can be used to produce a breathable layer from a polyvinyl chloride-polyurethane composite material: component parts by weight PVC 100 plasticizer 80 PU dispersion* 40 TPU 15 stabilizer 4 filler 20 pigment 10 *25-65 wt% solids content
  • PU dispersion polyurethane dispersion
  • TPU and PVC are each used as a powder.
  • the components are mixed into a paste and applied to a substrate and then dried and gelled to form the breathable polyvinyl chloride-polyurethane composite film.
  • a textile backing may be attached to the formed composite and the backing removed.
  • the composite material according to 1 includes polyurethane and PVC and self-assembles, generated in situ during painting and
  • Drying/gelling process Pores that are statistically distributed in the layer. Due to the distribution of the pores in the layer, sound waves can be refracted and scattered at the polymer-air interface, especially if the pores and channels are randomly aligned in all directions and thus can interact.
  • figure 5 12 schematically shows an example of a process sequence for producing the breathable film or layer from the polyvinyl chloride-polyurethane composite material 13.
  • a PVC plastisol 6, which can be produced from PVC powder and plasticizer, and an aqueous polyurethane dispersion 7 are mixed to form a polymer paste 8, with auxiliary agents and additives being added as required.
  • the polymer paste 8 is applied using a squeegee 10 to a release paper conveyed by rollers and passed with the release paper through a curing oven 11 in which the polymer paste e.g the furnace is cooled via a cooling drum 12.
  • a breathable PVC-polyurethane composite film 13 with self-organized, randomly distributed pores is obtained.
  • FIG. 2 shows a graph that demonstrates the dependency of the sound pressure on the frequency in the audible range for an audio system according to the invention in comparison to other conventional foils or artificial leather used as membranes.
  • the curve of the artificial leather according to the invention shows that this system has the properties of closed artificial leather (CEP 799_28) up to approx. 250 Hz and the properties of perforated material (CEP 803_45) from approx. 5000 Hz.
  • this synthetic leather can also ensure a feel and look that is equivalent to that of standard speaker covers made of hard plastic or thin material.
  • the 3 and 4 12 show a cross-sectional view and an exploded view, respectively, of an audio system according to the invention installed in the headrest of an automobile.
  • the headrest has an artificial leather 1 with a breathable layer of polyvinyl chloride-polyurethane composite material as the cover material.
  • a foam cover 2 is located under the imitation leather for padding.
  • the structure-borne sound transducer comprises an actuator 4 and a plastic plate for sound radiation 3 as well as a mounting element 5 for mounting.
  • the plate 3 is installed particularly for design reasons. It is not absolutely necessary for sound reproduction.
  • the structure-borne noise converter is located inside the headrest 4 and is attached to the foam cover 2 via the plastic plate 3 .
  • the actuator has electrical connections for connection to an amplifier (not shown).

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Laminated Bodies (AREA)
EP22210933.2A 2021-12-15 2022-12-01 Système composite multicouche comprenant un support textile facultatif doté d'une couche composite de polychlorure de vinyle-polyuréthane comme membrane de haut-parleur à grande largeur de fréquence Active EP4199537B8 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102021133363.6A DE102021133363A1 (de) 2021-12-15 2021-12-15 Multischichtverbundsystem mit optionalem textilem Träger mit einer Polyvinylchlorid-Polyurethan-Kompositschicht als Lautsprechermembran mit großer Frequenzbreite

Publications (3)

Publication Number Publication Date
EP4199537A1 true EP4199537A1 (fr) 2023-06-21
EP4199537B1 EP4199537B1 (fr) 2026-02-11
EP4199537B8 EP4199537B8 (fr) 2026-03-18

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EP22210933.2A Active EP4199537B8 (fr) 2021-12-15 2022-12-01 Système composite multicouche comprenant un support textile facultatif doté d'une couche composite de polychlorure de vinyle-polyuréthane comme membrane de haut-parleur à grande largeur de fréquence

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EP (1) EP4199537B8 (fr)
DE (1) DE102021133363A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060029249A1 (en) * 2004-08-05 2006-02-09 Pt. Hartono Istana Teknologi Loudspeaker with hair leather diaphragm
EP2918629A1 (fr) 2014-03-11 2015-09-16 Konrad Hornschuch AG Procédé de fabrication d'un film respirant
WO2020234317A1 (fr) * 2019-05-23 2020-11-26 Pss Belgium Nv Haut-parleur dipôle pour la production de son basse fréquence
DE102019210296B4 (de) * 2019-07-11 2021-08-12 Continental Engineering Services Gmbh Vorrichtung zur Schallerzeugung und deren Herstellung und Verwendung

Patent Citations (4)

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US20060029249A1 (en) * 2004-08-05 2006-02-09 Pt. Hartono Istana Teknologi Loudspeaker with hair leather diaphragm
EP2918629A1 (fr) 2014-03-11 2015-09-16 Konrad Hornschuch AG Procédé de fabrication d'un film respirant
WO2020234317A1 (fr) * 2019-05-23 2020-11-26 Pss Belgium Nv Haut-parleur dipôle pour la production de son basse fréquence
DE102019210296B4 (de) * 2019-07-11 2021-08-12 Continental Engineering Services Gmbh Vorrichtung zur Schallerzeugung und deren Herstellung und Verwendung

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