Classifications

• • 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
  • C03C17/34—Surface treatment of glass, not in the form of fibres or filaments, by coating with at least two coatings having different compositions
  • C03C17/36—Surface treatment of glass, not in the form of fibres or filaments, by coating with at least two coatings having different compositions at least one coating being a metal
  • C03C17/3602—Surface treatment of glass, not in the form of fibres or filaments, by coating with at least two coatings having different compositions at least one coating being a metal the metal being present as a layer
  • C03C17/3618—Coatings of type glass/inorganic compound/other inorganic layers, at least one layer being metallic
• • 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
  • C03C17/34—Surface treatment of glass, not in the form of fibres or filaments, by coating with at least two coatings having different compositions
  • C03C17/36—Surface treatment of glass, not in the form of fibres or filaments, by coating with at least two coatings having different compositions at least one coating being a metal
• • 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
  • B32B17/10165—Functional features of the laminated safety glass or glazing
  • B32B17/10174—Coatings of a metallic or dielectric material on a constituent layer of glass or polymer
• • 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
  • B32B17/10165—Functional features of the laminated safety glass or glazing
  • B32B17/10376—Laminated safety glass or glazing containing metal wires
• • 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
• • 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
  • C03C17/006—Surface treatment of glass, not in the form of fibres or filaments, by coating with materials of composite character
  • C03C17/007—Surface treatment of glass, not in the form of fibres or filaments, by coating with materials of composite character containing a dispersed phase, e.g. particles, fibres or flakes, in a continuous phase
• • 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
  • C03C17/34—Surface treatment of glass, not in the form of fibres or filaments, by coating with at least two coatings having different compositions
  • C03C17/36—Surface treatment of glass, not in the form of fibres or filaments, by coating with at least two coatings having different compositions at least one coating being a metal
  • C03C17/3602—Surface treatment of glass, not in the form of fibres or filaments, by coating with at least two coatings having different compositions at least one coating being a metal the metal being present as a layer
  • C03C17/3639—Multilayers containing at least two functional metal layers
• • 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
  • C03C17/34—Surface treatment of glass, not in the form of fibres or filaments, by coating with at least two coatings having different compositions
  • C03C17/36—Surface treatment of glass, not in the form of fibres or filaments, by coating with at least two coatings having different compositions at least one coating being a metal
  • C03C17/3602—Surface treatment of glass, not in the form of fibres or filaments, by coating with at least two coatings having different compositions at least one coating being a metal the metal being present as a layer
  • C03C17/3644—Surface treatment of glass, not in the form of fibres or filaments, by coating with at least two coatings having different compositions at least one coating being a metal the metal being present as a layer the metal being silver
• • 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
  • C03C17/34—Surface treatment of glass, not in the form of fibres or filaments, by coating with at least two coatings having different compositions
  • C03C17/36—Surface treatment of glass, not in the form of fibres or filaments, by coating with at least two coatings having different compositions at least one coating being a metal
  • C03C17/3602—Surface treatment of glass, not in the form of fibres or filaments, by coating with at least two coatings having different compositions at least one coating being a metal the metal being present as a layer
  • C03C17/3652—Surface treatment of glass, not in the form of fibres or filaments, by coating with at least two coatings having different compositions at least one coating being a metal the metal being present as a layer the coating stack containing at least one sacrificial layer to protect the metal from oxidation
• • 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
  • C03C17/34—Surface treatment of glass, not in the form of fibres or filaments, by coating with at least two coatings having different compositions
  • C03C17/36—Surface treatment of glass, not in the form of fibres or filaments, by coating with at least two coatings having different compositions at least one coating being a metal
  • C03C17/3602—Surface treatment of glass, not in the form of fibres or filaments, by coating with at least two coatings having different compositions at least one coating being a metal the metal being present as a layer
  • C03C17/3668—Surface treatment of glass, not in the form of fibres or filaments, by coating with at least two coatings having different compositions at least one coating being a metal the metal being present as a layer the multilayer coating having electrical properties
  • C03C17/3676—Surface treatment of glass, not in the form of fibres or filaments, by coating with at least two coatings having different compositions at least one coating being a metal the metal being present as a layer the multilayer coating having electrical properties specially adapted for use as electromagnetic shield
• • 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
  • C03C2217/00—Coatings on glass
  • C03C2217/40—Coatings comprising at least one inhomogeneous layer
  • C03C2217/42—Coatings comprising at least one inhomogeneous layer consisting of particles only
• • 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
  • C03C2217/00—Coatings on glass
  • C03C2217/90—Other aspects of coatings
  • C03C2217/93—Coatings containing a reinforcement comprising fibers or grids
• • 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
  • C03C2218/00—Methods for coating glass
  • C03C2218/30—Aspects of methods for coating glass not covered above
  • C03C2218/365—Coating different sides of a glass substrate
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
  • H01J2211/00—Plasma display panels with alternate current induction of the discharge, e.g. AC-PDPs
  • H01J2211/20—Constructional details
  • H01J2211/34—Vessels, containers or parts thereof, e.g. substrates
  • H01J2211/44—Optical arrangements or shielding arrangements, e.g. filters or lenses
  • H01J2211/446—Electromagnetic shielding means; Antistatic means

Definitions

• the invention relates to a transparent substrate, in particular made of glass, comprising metallic elements which can act on infrared radiation of long wavelength.
• the invention will be more particularly described for the use of such a substrate in a plasma screen, however it is not limited to such an application, the substrate being able to be inserted into any electromagnetic shielding wall.
• a plasma screen comprises a plasma gas trapped between two sheets of glass, and phosphors arranged on the internal face of the back sheet of the screen.
• the interactions between the particles of the plasma gas and the phosphors generate a radiation of electromagnetic waves which are located in the near infrared between 800 and 1000 nm and whose propagation, mainly through the face front of the screen, can be the source of very annoying disturbances, in particular for equipment located nearby and controlled by infrared, for example by means of remote controls.
• plasma screens have addressing systems (drivers) which can generate parasitic radiation vis-à-vis other devices with which they must not interfere such as microcomputers, mobile phones. ..
• a solution consists in placing against the front face of the screen a window which is both transparent and metallized to ensure electromagnetic shielding.
• a known type of window consists of two PVB sheets between which is held by bonding, a homogeneous metallic grid constituted by the weaving of metallic threads which are oriented in two substantially perpendicular directions and which have a thickness of approximately 50 ⁇ m, the meshes of the grid having a square surface of approximately 0.12 mm 2 .
• this solution for large screen formats is not satisfactory, in particular due to the slight flexibility of the PVB and the need to tension the metallic fabric during the laminating step, which can cause problems. of mesh distortion in the laminate.
• Another solution is rather to deposit the metal grid directly on a glass substrate by a usual photolithography technique and to assemble this substrate to the front face of the screen.
• the grid is generally superimposed so that the metal wires are parallel to the edges of the screen, which requires the horizontal wires to be orthogonal to the pixels of the screen.
• this arrangement of the grid can cause a moire effect when an observer looks at the screen from a certain angle, giving him significant visual discomfort.
• the glass substrate with which the metal grid incorporated in the PVB is associated advantageously comprises at least two layers of silver of thickness equivalent to approximately 10 nm, the layers being placed between two layers of dielectric material such as metal oxide to prevent the alteration of the silver during its deposition when the latter is produced by the sputtering technique.
• the glass substrate undergoes heat treatments of the bending, annealing and tempering type.
• a stack of thin layers is designed in known manner such that it has, for example, the following sequence:
• the substrate in particular of patent FR 2 781 789, improves the electromagnetic shielding as well as the moiré problem, it is always desirable to further increase the properties of existing solutions.
• the invention therefore aims to solve the disadvantage of the transmission of electromagnetic waves in the infrared through in particular a plasma screen, and to overcome the moiré problem when a metal grid is proposed as a solution the problem of electromagnetic shielding, while achieving satisfactory light transmission.
• a transparent substrate is provided provided provided with metallic elements whose characteristics and properties prevent the transmission of waves in the near infrared.
• the transparent substrate in particular made of glass, is provided with a stack of thin layers comprising at least two metal layers with properties in the infrared, of thickness e 1 for that closest to the substrate and thickness e 2 for the other, the ratio of
• thicknesses - being between 0.8 and 1.1, preferably between 0.9 and 1, e 2 characterized in that the total thickness in metallic layers e., + e 2 is between 27 and 30 nm, preferably between 28 and 29.5 nm, that a protective metallic layer is placed immediately above and at contact of each layer with properties in the infrared, and the resistance per square of the substrate is less than 1.8 ⁇ .
• the protective metal layer is based on a single metal chosen from niobium Nb or titanium Ti.
• the stack of thin layers can have the following sequence:
• the substrate of the invention very advantageously supports a heat treatment of quenching or bending.
• the thin layers are connected together and intended to be connected to ground when the substrate is used in electrical equipment.
• the transparent substrate in particular made of glass, comprises a network of metallic wires being in the form of a grid, the metallic wires being deposited with a thickness e and a width £, the substrate being characterized in that the thickness e of the wires is between 80 nm and 12 ⁇ rn, preferably between 200 nm and 1 ⁇ m, and the width £ of the wires is between 10 and 60 ⁇ m, preferably between 15 and 35 ⁇ m .
• the metal wires are made of copper or silver.
• the threads intersect to form a multiplicity of meshes M whose dimensions are not uniform over the surface of the substrate, which makes it possible to considerably reduce moiré.
• the length of the outline of a mesh side can vary between 250 and 750 ⁇ m.
• the satisfactory compromise to be established between the dimensions of the meshes, and the thickness and the width of the metallic wires makes it possible to attenuate at least 30 dB the electromagnetic waves between 30 and 1100 MHz.
• the ratio between the total surface of the meshes and the surface of deposition of the wires is greater than 65%, and the substrate has a diffuse transmission less than 2%.
• the substrate the shape of which is substantially parallelepiped, is characterized in that the metal wires are arranged at an angle relative to the edges of the substrate.
• the technique for producing the substrate comprising the metal wires notably uses photolitography.
• Photolitography makes it possible to produce very thin wires, in particular less than 40 ⁇ m in width, which then makes them almost invisible to the observer.
• Another advantage is to perfectly control both the dimensions and the various shapes of the meshes to be obtained, which cannot be envisaged by a weaving technique such as that used for the grid held between two sheets of PVB.
• the size of the wires influencing directly on the diffuse transmission of the substrate that is to say on the blurring of the screen perceptible by the observer, their thinness favorably reduces the blurring effect.
• the metal wires are preferably connected to each other by a metal strip intended to be connected to the electrical ground, in particular when the substrate is mounted on a plasma screen.
• the electrical connection of the wires on the substrate is advantageously carried out during the photolitography step.
• the substrate comprising the metallic wires and as defined above is associated with another transparent substrate comprising on one of its faces a stack of thin layers facing the metallic grid, the stack comprising at least one conductive metallic layer, of the silver type.
• the same substrate comprises the metallic wires on one of the faces, and on the opposite face, a stack of thin layers comprising at least one conductive metallic layer of the silver type.
• the associated substrate has the characteristics of the substrate of the first embodiment.
• a substrate of the invention placed against a plasma screen, it is advisable to add to the external face of the substrate, an anti-reflection coating.
• an anti-reflection coating it will be preferable to produce a laminated substrate by covering the metal wires or the stack of thin layers with a thermoplastic film.
• FIG. 1 is a sectional view of a transparent window according to a first embodiment, associated with a plasma screen
• Figure 2 is a sectional view of a transparent window according to a second embodiment, associated with a plasma screen
• Figure 3 is a variant of Figure 1
• - Figure 4 is a variant of Figure 2
• Figure 5 is a sectional view of a transparent window according to a third embodiment, intended to be associated with a plasma screen
• FIG. 6 illustrates the light transmission of a substrate according to various thickness ratios of the metal layers
• FIG. 7 illustrates the transmission of infrared radiation according to the total thickness of metal layers
• Figure 8 is a partial top view of a metal grid according to the invention
• Figure 9 illustrates electromagnetic attenuation curves corresponding to different models of metal grids.
• FIG. 10 illustrates the light transmission and the light diffusion for the models of grids referenced in FIG. 9. It is specified first of all that the proportions relating to the different sizes, in particular thicknesses, of the elements of the invention are not observed on drawings to make reading easier.
• FIG. 1 illustrates a transparent window 1 intended to be assembled on the front face of a plasma screen E.
• the transparent window 1 consists of a single substrate, such as a glass sheet 10, on which are deposited metal elements 20 or 21 with electromagnetic shielding properties.
• the transparent window 1 is made of laminated glass in order to give it mechanical strength and thus preserve the screen in the event of the front face of the window being broken.
• the metallic elements 20 consist of at least two electrically conductive functional layers, of the Ag type. These metallic layers are inserted in a stack of thin protective layers, the preferred sequence of which is as follows: Glass / Si 3 N 4 / ZnO / Ag / Ti / Si 3 N 4 / ZnO / Ag / Ti / ZnO / Si 3 N 4 .
• the Ti layer constitutes a metallic protective layer against silver, in particular preventing the oxidation of silver.
• a layer of TiO2 can be interposed between the layers of Si 3 N 4 and ZnO close to the glass so as to "wash" the color in reflection of the substrate.
• All the layers of the stack are deposited by a known sputtering technique on the internal face 11 of the substrate intended to be opposite the screen.
• the first metallic layer of Ag placed closest to the substrate has a thickness e., Substantially equivalent to the thickness e 2 of the
• the thickness ratio - is e 2 between 0.8 and 1.1, preferably between 0.9 and 1.
• the light transmission is very suitable, greater than 67% as visible from the figure
• the points in the graph correspond to various substrate samples for which the thickness ratio varies from 0.7 to 1.25, the substrates having a stack of the type given preferentially.
• the thicknesses e., And e 2 are much greater than those of the state of the art in order to increase the total thickness of metal on the substrate to increase the electromagnetic shielding and reduce the transmission of infrared radiation from the screen to the outside of the substrate.
• a total thickness of the metal layers will preferably be chosen between 28 and
• the radiation transmission thus reaching no more than 13% for a wavelength of 800 nm.
• the substrate obtained very advantageously has a low resistance, less than 1.8 ⁇ / D. In addition, it supports any heat treatment of quenching or bending.
• the external face 12 of the glass substrate 1 can be provided with an anti-reflection coating 30.
• the fixing of the substrate 1 on the front face of the screen is for example carried out by means of a double-sided adhesive 40.
• the adhesive is placed on the peripheral edge of the internal face 11 of the substrate, or is present under the form of a film stretched over almost all of the internal face 11 of the substrate.
• the metallic elements 21 consist of a network of metallic wires, made of Cu or Ag, in the form of a grid.
• the metal wires are deposited on the internal face 11 of the glass substrate 10 using a known photolithography technique.
• the external face 12 can receive an anti-reflection coating 30.
• the metal wires are preferably arranged in two substantially perpendicular orientations, and define a multitude of meshes M (FIG.
• the wires can be straight, have a sinusoidal shape or any other geometric shape.
• the electromagnetic shielding is reinforced by increasing the metal volume of the grid. To this end, it is possible to play on the width i and / or the thickness e of the wires.
• the wires of the entire grid can have the same width and the same thickness, but it is also possible to vary these characteristics from one place to another on the substrate.
• the method by photolitography is particularly appreciated because it makes it possible to perfectly control the thickness and the width of the metallic deposit and to be able to easily produce additional elements such as bus bars. Methods equivalent to photolitography such as photogravure or photo-enameling can be used.
• the width l of the wires is between 10 and 60 ⁇ m.
• the thickness e of the wires is between 80 nm and 12 ⁇ m.
• the increase in volume of the metal on the substrate namely the increase in width and / or thickness of the metal wires increases the electromagnetic shielding.
• the electromagnetic shielding is all the more satisfactory when this opening surface is small.
• FIG. 9 reproduces, for frequencies between 20 and 1100 MHz, the curves of the attenuation in dB generated by different models of grid with M square meshes, the side of which is defined by the distance separating the internal edges of two opposite wires, is between 250 and 750 ⁇ m.
• the table below summarizes the different models M1 to M7.
• FIG. 10 relates to the measurements of light transmission and light scattering - or also called diffuse transmission - of substrates comprising the grid models referenced M1 to M7 in FIG. 9.
• Model 1 is very efficient in terms of shielding (around 55 dB of attenuation), but generates light scattering, namely an image blur, much too great, of the order of 9%.
• the M7 model is correct with a shielding greater than 30 dB, up to close to 50 dB for frequencies of the order of 130 MHz, and a light transmission greater than 80% with a diffusion of approximately 1, 5%.
• the preferred values of the dimensions of the wires are: a width £ of wires between 15 and 35 ⁇ m and a thickness between 200 nm and 1 ⁇ m.
• the dimensions of the meshes M are defined so that the light transmission or the ratio between the total surface of the meshes - that is to say the opening surface for the transmission of light - and the surface of wire deposition - i.e. the surface for which light transmission is prevented - or greater than 65%, while establishing a diffuse transmission of less than 2%.
• the grid is preferably arranged at an angle to the edges of the substrate so that the wires of the grid form an angle. approximately 45 ° with the pixels of the screen.
• the meshes M of the grid have variable dimensions generating surfaces with variable openings. This non-uniformity of the meshes obtained by a more or less large spacing of the threads between them, succeeds in considerably reducing the moiré effect.
• the window 1 is made of laminated glass.
• the window comprises a glass sheet 10 situated on the front face and constituting the substrate for the metallic elements, which correspond to the stack of layers 20 in FIG. 3 and to the grid 21 in FIG. 4, another glass sheet 50 located on the rear face and intended to be opposite the screen, as well as a sheet of thermoplastic polymer 60 based for example on polyvinyl butyral (PVB) which is interposed between the two sheets of glass.
• the external face of the glass sheets 10 and 50 is provided with an anti-reflection coating 30.
• the laminated window is fixed to the screen by means of clipping not shown or by any other usual means.
• the window 1 comprises a glass sheet 10 constituting the substrate of the metal grid 21, a glass sheet 50 constituting the substrate of the stack of thin layers provided with two silver layers which have the same thickness characteristics explained above, and a sheet of thermoplastic polymer 60 separating the metal grid 21 from the stack of layers 20 so as to serve as a protective film vis-à-vis the layers and to establish a lamination of the window.
• the presence of the metallic silver layers adds a quantity of metal to that already existing thanks to the grid, the silver layers being particularly adapted to stop the transmission of wavelengths in the infrared, this configuration improves all the more plus the electromagnetic shielding of the screen.
• the external faces of the two glass sheets 10 and 50 are advantageously provided with an anti-reflection coating 30.
• the laminated window is fixed to the screen by clipping means, the front face of the window corresponding either to the substrate carrying the grid 21 or that provided with the stack of layers 20.
• the metallic elements of the various embodiments described, metallic layers and / or metallic grid, are connected by electrically conductive means to a metallic point of the screen connected to ground in order to ground all of the metallic elements. .

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• Chemical & Material Sciences (AREA)
• Materials Engineering (AREA)
• Geochemistry & Mineralogy (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Engineering & Computer Science (AREA)
• Organic Chemistry (AREA)
• General Chemical & Material Sciences (AREA)
• Life Sciences & Earth Sciences (AREA)
• Physics & Mathematics (AREA)
• Electromagnetism (AREA)
• Dispersion Chemistry (AREA)
• Composite Materials (AREA)
• Surface Treatment Of Glass (AREA)
• Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
• Laminated Bodies (AREA)
• Gas-Filled Discharge Tubes (AREA)
• Joining Of Glass To Other Materials (AREA)

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• 2000
  • 2000-04-26 FR FR0005284A patent/FR2821349A1/fr active Pending
• 2001
  • 2001-04-11 AU AU2001250481A patent/AU2001250481A1/en not_active Abandoned
  • 2001-04-11 EP EP01923793A patent/EP1278707A1/fr not_active Withdrawn
  • 2001-04-11 PL PL01357566A patent/PL357566A1/xx not_active Application Discontinuation
  • 2001-04-11 WO PCT/FR2001/001107 patent/WO2001081262A1/fr not_active Application Discontinuation
  • 2001-04-11 JP JP2001578362A patent/JP2003531094A/ja active Pending
  • 2001-04-11 KR KR1020027012539A patent/KR20020093853A/ko not_active Application Discontinuation
  • 2001-04-11 CA CA002407032A patent/CA2407032A1/fr not_active Abandoned
  • 2001-04-11 CZ CZ20023552A patent/CZ20023552A3/cs unknown
  • 2001-04-23 TW TW094124933A patent/TW200536800A/zh unknown
  • 2001-04-23 TW TW090109657A patent/TWI243802B/zh active
• 2002
  • 2002-10-25 US US10/280,002 patent/US20030099842A1/en not_active Abandoned

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