Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
  • B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
  • B32B17/10—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
  • B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
  • B32B17/10—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
  • B32B17/10005—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing
  • B32B17/10009—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the number, the constitution or treatment of glass sheets
  • B32B17/10036—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the number, the constitution or treatment of glass sheets comprising two outer glass sheets
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
  • B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
  • B32B17/10—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
  • B32B17/10005—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing
  • B32B17/1055—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the resin layer, i.e. interlayer
  • B32B17/10733—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the resin layer, i.e. interlayer containing epoxy
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
  • B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
  • B32B17/10—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
  • B32B17/10005—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing
  • B32B17/1055—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the resin layer, i.e. interlayer
  • B32B17/10761—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the resin layer, i.e. interlayer containing vinyl acetal
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
  • B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
  • B32B17/10—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
  • B32B17/10005—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing
  • B32B17/1055—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the resin layer, i.e. interlayer
  • B32B17/1077—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the resin layer, i.e. interlayer containing polyurethane
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
  • B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
  • B32B17/10—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
  • B32B17/10005—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing
  • B32B17/1055—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the resin layer, i.e. interlayer
  • B32B17/10788—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the resin layer, i.e. interlayer containing ethylene vinylacetate
• • C—CHEMISTRY; METALLURGY
  • C03—GLASS; MINERAL OR SLAG WOOL
  • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
  • C03C17/00—Surface treatment of glass, not in the form of fibres or filaments, by coating
  • C03C17/28—Surface treatment of glass, not in the form of fibres or filaments, by coating with organic material
  • C03C17/32—Surface treatment of glass, not in the form of fibres or filaments, by coating with organic material with synthetic or natural resins
• • C—CHEMISTRY; METALLURGY
  • C03—GLASS; MINERAL OR SLAG WOOL
  • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
  • C03C17/00—Surface treatment of glass, not in the form of fibres or filaments, by coating
  • C03C17/28—Surface treatment of glass, not in the form of fibres or filaments, by coating with organic material
  • C03C17/32—Surface treatment of glass, not in the form of fibres or filaments, by coating with organic material with synthetic or natural resins
  • C03C17/328—Polyolefins
• • C—CHEMISTRY; METALLURGY
  • C03—GLASS; MINERAL OR SLAG WOOL
  • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
  • C03C27/00—Joining pieces of glass to pieces of other inorganic material; Joining glass to glass other than by fusing
  • C03C27/06—Joining glass to glass by processes other than fusing
  • C03C27/10—Joining glass to glass by processes other than fusing with the aid of adhesive specially adapted for that purpose
• • 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
  • H04R7/045—Plane diaphragms using the distributed mode principle, i.e. whereby the acoustic radiation is emanated from uniformly distributed free bending wave vibration induced in a stiff panel and not from pistonic motion
• • 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
  • 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; DEAF-AID SETS; 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
  • H04R2307/023—Diaphragms comprising ceramic-like materials, e.g. pure ceramic, glass, boride, nitride, carbide, mica and carbon materials
• • 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
  • H04R2499/11—Transducers incorporated or for use in hand-held devices, e.g. mobile phones, PDA's, camera's
• • 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
  • H04R2499/15—Transducers incorporated in visual displaying devices, e.g. televisions, computer displays, laptops

Definitions

• the present invention relates to glazing used as sound generators.
• the display screen is normally coated with protective glazing, usually formed by a single or laminated glass plate.
• the sound generator includes one or more speakers, separate from the screen.
• the separate arrangement of speakers and screen is a source of space.
• the screen itself as a resonator to which one or more exciters are attached, the assembly constituting the sound generator.
• the glazing is a glass sheet barely 0.3 mm thick.
• the use of such a thin glass plate is imposed by the acoustic properties of the glass.
• mechanical resistance in particular to impact, it is incompatible with the manufacture of large screens (computer or television screens).
• the invention aims to remedy the drawbacks and disadvantages of known glazing.
• the invention more particularly aims at providing a sound-generating glazing which combines good acoustic properties, excellent optical quality and good mechanical properties, particularly good impact resistance and good scratch resistance.
• the invention relates to a sound-generating glazing comprising at least one sheet of glass, a film of a damping material attached to the sheet of glass on one of its faces, and on the other to a sheet of rigid material.
• the glass sheet, the film of material associated therewith, and the sheet of rigid material are at least translucent. They are preferably transparent to light. They can be transparent to white light or to only part of the white light spectrum. In most applications, white light transparency is preferred.
• the term “light” will generally designate all or a fraction of the spectrum of white light.
• the exciter can for example be of the piezoelectric type. It must be of sufficient power to vibrate the glazing. In principle, the exciter can be placed anywhere on the glazing. However, it is advantageous to have the exciter (s) at the edge of the glazing. Advantageously, several exciters are used, distributed around the periphery. The precise arrangement of these exciters on the periphery is chosen according to the resonance modes of the glazing
• the choice of the exciter is not critical for the definition of the invention.
• extra flat exciters are used.
• extra flat exciters which are very suitable for the invention are those produced by NXT pic, under the name “NXT SoundVu technology” and those produced by Glas Platz GmbH & Co. KG, under the name “Magic Sound® ”, defined upper.
• the panel is laminated and comprises at least one film of an acoustically damping material.
• the glazing constitutes the resonator. It vibrates under the action of the exciter, generating audible sounds.
• the thickness of the glazing and particularly that of the glass sheet therefore constitutes an important parameter. It must be determined so that the glazing can vibrate under the action of the exciter, by emitting sounds of sufficient intensity.
• the thickness of the glass sheet is conditioned by its frequency of coincidence. In practice, it is sought to move the latter towards the acute frequencies of the sound waves, by reducing the thickness of the glass sheet. It is recommended to select the thickness of the glass sheet so that its coincidence frequency is moved beyond 6 (preferably 10) kHz.
• the thickness of the glass sheet it is preferable to reduce the thickness of the glass sheet until its coincidence frequency is greater than the maximum frequency normally audible by the human ear (about 20 kHz). A thickness of less than 2 mm (preferably 1.5 mm) is therefore recommended. For mechanical strength considerations, it is recommended that the thickness of the glass sheet is greater than 0.5 mm (preferably 0.8 mm). Thicknesses of 1 to 1.5 mm are specially recommended.
• the glass sheet must be at least translucent. It is preferably transparent to light.
• the function of the panel film is to ensure the acoustic quality of the panel. For this purpose, it must be made of damping material.
• the second sheet of rigid material of the laminate is advantageously a second glass sheet similar or identical to the first. It can also be a sheet of synthetic material having the optical characteristics required for complete glazing.
• the laminated glazing is mounted in the screens with a sheet of glass facing outwards to best guarantee scratch resistance.
• PVB polyvinylbutyral
• the damping property of the film is generally defined by its damping or acoustic loss factor, which indicates the amount of vibrational energy converted into heat.
• the theoretical maximum damping factor is 100%.
• a film is advantageously selected such that the acoustic damping factor of the glazing is less than 80% (preferably 75%) at 200 Hz and 20 ° C. It is recommended that the factor d the damping is greater than 5% (preferably 8%) at 200 Hz and 20 ° C.
• the damping factors of 10 to 50% are preferred.
• the film having the required acoustic properties can also be defined by its viscoelastic characteristics on which the damping properties depend.
• the shear modulus is a parameter expressing the viscoelasticity of the products considered.
• viscoelastic characteristics are also a function of temperature.
• shear modulus of the products considered according to the invention is defined at a temperature of 20 ° C.
• the shear modulus for the frequency of 200 Hz, at the temperature of 20 ° C., is advantageously less than 10 6 Pa.
• the glazing it is preferable for the glazing to offer an average damping factor over the entire frequency range from 200 to 4400 Hz which is not less than 12% and particularly preferably not less than 20%.
• This average damping must also be obtained for the effective temperatures of use. In practice for television type screens, the usual temperatures vary between 20 and 40 ° C. The minimum average damping must be ensured over this entire temperature range.
• the “average” damping of the glazing determined for all of the frequencies from 200 to 4400 Hz, for a given damping film, preferably varies only in a limited manner in the range of useful temperatures. The variation in average damping over the temperature range from 20 to 40 ° C. must not exceed 35%, and preferably must be less than 25%.
• the film must be translucent. It is preferably substantially transparent to light.
• Examples of materials usable for the film include copolymers of ethylene and vinyl acetate and polyurethanes.
• films made of polyvinyl butyral are advantageously used, the plasticity of which is increased by the addition of plasticizers in kind and in an appropriate quantity. If in safety glazing, the plasticization of the interlayer is restricted to maintain significant mechanical resistance to the laminated assembly, in acoustic applications this requirement is not of the same magnitude and the products can be of much more plastic quality .
• composite films comprising, for example, two layers of usual PVB for their adhesion to glass sheets, these two layers sandwiching a layer of material meeting the acoustic damping characteristics of the invention.
• This layer can itself be made of "overplasticized” PVB.
• Products of this type are for example those marketed by the company Sekisui under the name of S-LEC.
• Laminate products of this type are the subject of publications such as EP 457
• the glazing according to the invention is most often used with a screen or an assembly ensuring the display of images.
• This assembly forming the screen can constitute the second rigid sheet of the glazing according to the invention provided that it lends itself to an assembly of the type used to constitute the laminated glazing.
• the assembly can be carried out by implementing the thermoplastic qualities of the damping films. It is also possible to form the laminate using an appropriate resin whose crosslinking is carried out directly between the rigid sheets, the glass sheet of the glazing on the one hand, the second rigid sheet or the panel constituting the screen. Products of this type are for example epoxy resins such as those used in acoustic insulating glazing.
• Examples of materials which can be used for the rigid plate include in particular mineral or synthetic glasses such as polyacrylates or polycarbonates.
• the dimensions of the glazing and its components are not critical for the definition of the invention. They will depend on the applications for which the phonic glazing according to the invention is intended.
• the glazing In general, it is advantageous for the glazing to have a total thickness greater than 1 mm, in order to have sufficient mechanical strength. It is desirable to avoid excessive thickness, for a question of weight, size and cost. Thicknesses less than 8 mm are recommended, those of 2.5 to 5 mm being preferred.
• the glazing according to the invention can have any shape compatible with the destination of the glazing. It is generally planar, but it can also have a curved shape around one or more axes.
• the glazing according to the invention combines a set of properties hitherto considered incompatible.
• the glass sheet gives it good optical and mechanical properties, in particular resistance to scratching, and its association with the film of acoustically damping material gives it good acoustic properties.
• the glazing formed from the glass sheet, and from the film, associated with the second sheet or with the panel of a screen ensures good mechanical resistance.
• the sound-generating glazing according to the invention finds various applications in the manufacture of image viewing devices, such as screens for televisions, portable computers, mobile phones, home cinema or physical analysis apparatus. and / or chemical.
• glazing communicating both protective and generator of sounds (music or vocal information) in particular for shop windows or museums, bus shelters, ceilings, mirrors or decorative glasses, panels or advertising partitions, picture frames, loudspeakers ... (non-exhaustive list).
• the invention therefore also relates to an image display screen, which is characterized in that it comprises a sound generating glazing according to the invention as defined above.
• display screen designates any screen capable of supporting an image.
• image has a broad definition and designates not only the graphic representation of objects, but also letters or alphabetical symbols.
• the screen according to the invention can for example comprise a sheet or a plate on which an image has been drawn and / or painted.
• the screen comprises a sheet or a panel of uniform color (for example white), intended to receive an image projected from a suitable projector or support for elements generating this image .
• uniform color for example white
• the screen according to the invention can for example comprise a sheet or a plate on which an image has been drawn and / or painted.
• the screen comprises a sheet or a panel of uniform color (for example white), intended to receive an image projected from a suitable projector or support for elements generating this image .
• uniform color for example white
• the invention relates especially to display screens of the type defined above, intended to equip image generators selected from physical or chemical analysis apparatus, televisions, computers and mobile telephones.
• the screen comprises for example a plate coated with a fluorescent film, fitted to a cathode ray tube or a plate carrying an assembly of liquid crystals, in a manner well known in the techniques of manufacturing computers and televisions.
• the sound-generating glazing according to the invention can also find applications in the building industry, where it can be used as glazing equipping windows, in particular shop windows, hotels or restaurants (non-exhaustive list).
• the invention therefore also relates to the use of the glazing according to the invention as transparent glazing for a building.
• FIG. 1 is a schematic view, in exploded perspective, of a particular embodiment of the glazing according to the invention.
• FIG. 2 is a representation similar to that of Figure 1 of a second embodiment of the invention.
• FIG. 3 is a graph giving for three materials the average damping (in percentage) as a function of temperature
• FIG. 5 is a diagram of the device used for measuring depreciation.
• the reference notation 1 designates, as a whole, a glazing according to the invention.
• the glazing 1 is applied to a screen 2 of a portable computer, shown in gray, so as to completely cover it.
• the screen 2 is for example with liquid crystal, in a manner well known in the art of manufacturing computers and computer monitors.
• the panel constituting the front face of the screen is for example made of glass or translucent plastic material.
• the glazing 1 comprises a flat film 3 sandwiched between a sheet of glass 4, and a sheet of glass 5.
• the sheet of glass 5 is flat and has substantially the same dimensions as the screen 2. It can be applied directly against the screen 2.
• the glass plate 5 can be kept slightly apart from the screen 2 by an intermediate frame, not shown.
• the glass plate 5 can be of the same thickness as the sheet 4 or of greater thickness, its main role being to impart the required mechanical properties to the assembly, in particular when the sheet 4 is very thin.
• the glass sheet 4 is planar and has the same dimensions as the plate 5. It is surrounded by a frame 6, into which are inserted piezoelectric exciters, not shown. These piezoelectric exciters are designed to subject the glass sheet 4, and generally to the whole of the glazing (glass sheet 4, damping film 3, second rigid sheet 5), to vibrations liable to emit sound waves in the audible spectrum (from 20 Hz to approximately 20 kHz).
• the glass sheet 4 has for example a thickness of about 1.1 mm.
• the exciters are in contact with one of the faces of the sheet 4. They are either arranged between the frame 6 and the sheet 4. In this case, they are put into place after laminating all of the two sheets 4 and 5 and the damping sheet 3, either on the face which is in contact with the sheet 3.
• the introduction in this case can be carried out before lamination provided that the exciter or exciters in question are of thickness compatible with this assembly. It is still possible to provide housings for these exciters in the sheet 3, preferably before proceeding to the lamination.
• the exciters can be fixed to the rigid sheet 5.
• the film 3 is sandwiched between the glass sheet 4 and the glass sheet 5. It is made of an acoustically absorbing polymer material, having an acoustic loss factor about 0.3. It must also be transparent to white light.
• the film 3 can for example be made of a copolymer of ethylene and vinyl acetate and have a thickness of 0.4 to 0.8 mm.
• the film 3 is made of polyurethane and its thickness is approximately 0.7 to 0.8 mm.
• the rigid plate 5 is made of polycarbonate and its thickness is approximately 1 mm.
• the glass sheet 4 gives the glazing a high scratch resistance and good optical properties.
• FIG. 2 presents the constituent elements of a glazing in which the glass sheet 4 is associated with the film of acoustic damping material and is directly fixed to the panel constituting the screen 2.
• the constitution of the film 3 from a resin crosslinked in situ between the glass sheet 4 on the one hand and the screen 2, on the other hand is advantageous, insofar as it can be carried out without an operation of assembly requiring a rise in temperature, which is generally not possible with electronic components of the screens in question.
• the amortization measurement technique used is that described in connection with ISO / PAS 16940. The specific conditions are indicated below.
• the apparatus used is shown diagrammatically in FIG. 5.
• the analyzed sample 9 introduced into the thermostatically controlled enclosure 8 (temperature control 18) is supported at its center by the support 10. It is fixed to the latter by gluing 12.
• the excitation is communicated to the sample 9 by the vibrating pot 19 and the intermediary of the support 10.
• the circuit includes a noise generator 17, a power amplifier 16 and an impedance head 11.
• the analysis is done via an impedance measuring amplifier 13 associated with an FFT analyzer 14, and a calculation system 15.
• the samples tested consist of laminated bars of
• Bruel & Kjaer type 1405) Under the effect of excitation, the mechanical impedance of the sample is measured (Bruel & Kjaer impedance head, type 8001), and the different resonance frequencies are determined (ONO SOKKI frequency analyzer, type CF-910 ).
• the measurement is performed for the entire frequency range of
• the measurements are made at the temperatures representing the operating modes representative of the usual operating conditions of television type screens. Three series of measurements are made respectively at 20, 30 and 40 ° C.
• the damping films tested are respectively a polyvinyl butyral film traditionally used in the applications of laminated glazing intended for the building industry, and two films known for use in acoustically insulating glazing.
• the laminated bar comprising the traditional PVB rated A does not have any acoustic qualities. It is relatively rigid.
• the film whose glazing sample tested is rated B is a composite made up of two PVB films of reduced thickness separated by a film whose plasticity is much higher than that of PVB.
• the film denoted C consists of a highly plasticized PVB by addition of plasticizing constituents.
• the results of the measurements are reported as a function of temperature and frequency in the following tables denoted A, B and C.
• a last table indicates the average damping value at the various temperatures.
• the results are also reproduced in FIG. 3 representing the damping as a function of the temperature.
• the damping factor for the sample comprising the traditional PVB is relatively low at the temperatures considered. It only becomes significant at the highest temperatures.
• the other two products offer significantly higher damping, which, unlike the previous product, decreases when the temperature rises a lot. In the range of 20 to 40 ° C., these two products meet the general conditions of the invention.
• FIGs 4a and 4b show two possible types of construction. These two representations differ in the location of the exciter 7 relative to the glass sheet 4.
• the figures show only one exciter each time.
• the glazings according to the invention can each receive several exciters. This is useful in particular because the resonance of the sheet depends on the location of the exciter in relation to it.
• exciter 6 As shown in the exciter 6, or one of them, can be arranged on one face of the sheet 4 (FIG. 4a). In the same way, it is possible to have one or more exciters on the edge of the sheet 4. This latter arrangement has certain advantages from the acoustic point of view, and in addition makes it possible to completely disengage the glass sheet from any element which masks the presence of these exciters.
• FIGS. 4a and 4b show the exciter fixed to the glass sheet 4, these can also be fixed to the associated rigid sheet 5.
• the choice depends at least in part on the convenience of positioning these exciters relative to the glazing, it also takes into account the peculiarities of resonance of the glazing.

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• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• General Chemical & Material Sciences (AREA)
• Geochemistry & Mineralogy (AREA)
• Signal Processing (AREA)
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• Chemical Kinetics & Catalysis (AREA)
• Multimedia (AREA)
• Acoustics & Sound (AREA)
• Materials Engineering (AREA)
• Organic Chemistry (AREA)
• Ceramic Engineering (AREA)
• Joining Of Glass To Other Materials (AREA)
• Laminated Bodies (AREA)
• Piezo-Electric Transducers For Audible Bands (AREA)
• Diaphragms For Electromechanical Transducers (AREA)
• Devices For Indicating Variable Information By Combining Individual Elements (AREA)

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• 2006
  • 2006-12-06 CA CA002632650A patent/CA2632650A1/fr not_active Abandoned
  • 2006-12-06 WO PCT/EP2006/069372 patent/WO2007065909A1/fr active Application Filing
  • 2006-12-06 KR KR1020087015800A patent/KR20080078863A/ko not_active Application Discontinuation
  • 2006-12-06 EP EP06830416A patent/EP1966102A1/fr not_active Withdrawn
  • 2006-12-06 RU RU2008127159/03A patent/RU2436747C2/ru not_active IP Right Cessation
  • 2006-12-06 JP JP2008543825A patent/JP5057342B2/ja not_active Expired - Fee Related
  • 2006-12-06 SG SG201009047-0A patent/SG168515A1/en unknown
  • 2006-12-06 CN CN2006800516555A patent/CN101360693B/zh not_active Expired - Fee Related
• 2009
  • 2009-04-17 HK HK09103549.1A patent/HK1125911A1/xx not_active IP Right Cessation

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