US20090015909A1 - Transparent substrate comprising a stack of thin layers for electromagnetic armour - Google Patents
Transparent substrate comprising a stack of thin layers for electromagnetic armour Download PDFInfo
- Publication number
- US20090015909A1 US20090015909A1 US12/234,881 US23488108A US2009015909A1 US 20090015909 A1 US20090015909 A1 US 20090015909A1 US 23488108 A US23488108 A US 23488108A US 2009015909 A1 US2009015909 A1 US 2009015909A1
- Authority
- US
- United States
- Prior art keywords
- substrate
- layer
- thickness
- silver
- layers
- 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.)
- Abandoned
Links
Images
Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K9/00—Screening of apparatus or components against electric or magnetic fields
- H05K9/0073—Shielding materials
- H05K9/0094—Shielding materials being light-transmitting, e.g. transparent, translucent
- H05K9/0096—Shielding materials being light-transmitting, e.g. transparent, translucent for television displays, e.g. plasma display panel
-
- 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
-
- 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
- B32B17/10018—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 only one glass sheet
-
- 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
- B32B17/1055—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
- C03C17/34—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
-
- 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
- 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
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
- G02B1/11—Anti-reflection coatings
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J17/00—Gas-filled discharge tubes with solid cathode
- H01J17/02—Details
- H01J17/16—Vessels; Containers
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J5/00—Details relating to vessels or to leading-in conductors common to two or more basic types of discharge tubes or lamps
- H01J5/02—Vessels; Containers; Shields associated therewith; Vacuum locks
-
- 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
- B32B2367/00—Polyesters, e.g. PET, i.e. polyethylene terephthalate
-
- 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
- C03C2217/70—Properties of coatings
- C03C2217/73—Anti-reflective coatings with specific characteristics
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/12—All metal or with adjacent metals
- Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
- Y10T428/12639—Adjacent, identical composition, components
- Y10T428/12646—Group VIII or IB metal-base
Definitions
- the subject of the invention is a transparent substrate, especially made of glass, which is coated with a thin-film multilayer, comprising at least one metal layer, for electromagnetic shielding.
- the invention will be more particularly described for the use of such a substrate in a plasma display screen; however, it is not limited to such an application, it being possible for the substrate to be inserted into any electromagnetic shielding wall.
- a plasma display screen comprises a plasma gas mixture (Ne, Xe, Ar) trapped between two glass plates, and phosphors placed on the internal face of the rear plate of the display.
- Ultraviolet light radiation emitted by the plasma gas mixture during the plasma discharge between the two glass plates interacts with the phosphors on the internal face of the rear plate in order to produce the visible light radiation (red, green or blue).
- a gas particle deexcitation mechanism competes with the UV emission, which generates infrared radiation between 800 and 1250 nm, the propagation of which, mainly through the front face of the display, may be the source of very troublesome interference, especially as regards equipment located nearby and controlled by infrared, for example by means of remote controls.
- plasma display screens possess addressing systems or drivers that may generate parasitic radiation which must not interfere with other devices, such as microcomputers, mobile telephones, etc.
- one solution consists in placing against the front face of the display a window, also called a filter, which is both transparent and metallized in order to provide electromagnetic shielding.
- This filter is, for example, a transparent substrate coated with thin silver-based layers that reflect the electromagnetic waves in the frequency range from 30 MHz to 1 GHz and infrared beyond 800 nm.
- patent FR 2 641 272 proposes a substrate comprising a reflective silver layer sandwiched between a transparent sublayer that comprises at least one layer of a metal oxide, and a transparent covering layer that comprises a layer of sacrificial metal oxide, a zinc oxide layer, the thickness of which does not exceed 15 nm, and an upper covering layer of a metal oxide.
- the silver layer preferably has a thickness of between 8 and 12 nm.
- the metal oxide layer of the sublayer may be chosen from several oxides and may be a mixture of several oxides.
- a preferred example is a titanium dioxide layer and a tin oxide layer deposited on said titanium dioxide.
- the object of the sacrificial metal oxide is to protect the silver layer from oxidation, in particular during its deposition when this is carried out by the technique of sputtering. This is because, if the silver were to be impaired, the coated substrate would lose its low emissivity and its light transmission would be greatly reduced.
- the sacrificial metal often preferred is titanium, as it provides the silver with very effective protection against oxidation and has the advantage of being easily oxidized, to form an oxide of very low absorbency.
- the zinc oxide layer serves as protection against the penetration of oxygen into the lower layers and allows the thickness of sacrificial metal to be reduced somewhat, this metal then being more easily, more completely and more uniformly oxidized.
- the above document requires a limited thickness for the zinc oxide layer of 15 nm, in particular so as to give the layer good light transmission properties.
- Such a substrate with a single metal layer is not suitable for obtaining sufficient electromagnetic shielding, such as to have a surface resistance of less than 1.8 ⁇ / ⁇ .
- other patent applications propose multilayers containing a plurality of metal layers, in particular silver layers.
- increasing the number of layers reduces the light transmission; a compromise between thicknesses and types of layer must therefore be found in order to achieve satisfactory light transmission.
- WO 01/81262 proposes a multilayer having two silver layers, with a thickness e 1 in the case of the silver layer closest to the substrate and a thickness e 2 for the other layer, a sacrificial metal oxide, such as titanium oxide, being placed above each silver layer in order to protect it.
- a sacrificial metal oxide such as titanium oxide
- the ratio of the thicknesses e 1 /e 2 is between 0.8 and 1.1, preferably between 0.9 and 1, and the total thickness of the metal layers, e 1 +e 2 , is between 27.5 and 30 nm, preferably between 28 and 29.5 nm.
- European patent application EP 1 155 816 discloses a multilayer having three, or even four, silver layers with an alternation of a titanium oxide layer and of a layer having a refractive index of less than 2.4 at a wavelength of 550 nm, such as for example zinc oxide or preferably silica nitride.
- the thickness of the silver layer closest to the substrate and of that furthest away is preferably equal to 0.5 to 1 times the thickness of the other silver layer.
- An example of a sequence having a surface resistance of 1.5 ⁇ / ⁇ , with a light transmission of 67%, is given with three palladium-doped silver layers each having a thickness of 16 nm. This sequence is the following:
- the object of the invention is therefore to find another filter solution, especially for a plasma display screen, in order to alleviate the problem of electromagnetic wave transmission, while still achieving satisfactory optical properties.
- the transparent substrate especially made of glass, provided with a thin-film multilayer that includes three silver layers and comprises, alternately on the substrate, a titanium dioxide layer, a metal oxide layer, one of the silver layers and a covering layer, characterized in that:
- the thickness of each of the silver layers is between 13 nm and 19 nm.
- the thicknesses (e Ag1 , e Ag2 , e Ag3 ) of the three respective layers (Ag 1 , Ag 2 , Ag 3 ) are identical, or else they vary in a ratio of between 0.8 and 1.2 and are such that e Ag1 ⁇ e Ag3 ⁇ e Ag2 .
- the titanium dioxide layer as sublayer for the silver layer (Ag 1 ) closest to the substrate has a thickness of between 10 and 20 nm, preferably between 10 and 15 nm, and the titanium oxide layers as sublayers for the other two silver layers (Ag 2 , Ag 3 ) have a thickness of between 35 and 55 nm, preferably between 40 and 50 nm.
- the zinc oxide layer has a thickness of greater than 15 nm.
- the sacrificial metal layer is of niobium, titanium or zirconium, and has a thickness not exceeding 2 nm.
- the antireflection layer has a thickness of between 25 and 50 nm, preferably between 25 and 35 nm.
- this antireflection layer includes at least one titanium dioxide layer having a thickness of between 15 and 35 nm, preferably between 20 and 30 nm, and may also include another layer of a metal oxide that is deposited on said titanium dioxide layer and has a thickness of between 5 and 15 nm, preferably between 6 and 10 nm.
- This metal oxide layer is preferably tin oxide (SnO 2 ) or silicon nitride (Si 3 N 4 ).
- the substrate according to the invention has a surface resistance not exceeding 1 ⁇ / ⁇ , preferably between 0.7 and 0.9 ⁇ / ⁇ .
- the substrate may be made of toughened or untoughened glass, or made of plastic.
- This filter therefore comprises a substrate provided with the multilayer of the invention, together with one or more functional plastic sheets (for example with pigments or dyes) and/or another transparent substrate, optionally coated with an antireflection layer, so as to have the following optical properties:
- FIG. 1 illustrates a first embodiment of an electromagnetic shielding filter
- FIG. 2 illustrates a second embodiment of an electromagnetic shielding filter
- FIG. 3 illustrates schematically the multilayer of the invention.
- FIG. 1 illustrates a first example of an embodiment of the transparent structure 1 intended to be joined to the front face of a plasma display in order to form an optical and electromagnetic shielding filter.
- the structure 1 comprises a first transparent substrate 10 , which for example is of the glass type but which could, as a variant, be made of plastic, intended to be placed on the same side as the display, a thin-film multilayer 20 according to the invention, which is placed on the internal face of the substrate 10 , facing the inside of the structure, a second substrate 30 of the glass type, which is joined to the first substrate, facing the multilayer 20 , by means of a plastic film 40 , such as a PVB film.
- This functional plastic film may advantageously include a mineral pigment or an organic dye so as to filter the orange color of wavelength centered on 590 nm.
- the reader may refer for further details about the plastic film or alternative embodiments of the structure to French patent application FR 03/04636.
- the external faces of the substrates 10 and 30 to the outside of the structure are preferably provided with an antireflection coating 50 .
- FIG. 2 illustrates a second example of an embodiment of the structure 1 , which in this case comprises a substrate 10 one of the faces of which, intended to be on the opposite side from the observer, is provided with the thin-film multilayer 20 , and a substrate 60 made of plastic, such as PET, which is intended to be placed on the same side as the display and is joined to the substrate 10 , facing the multilayer 20 , by means of a plastic film 40 , such as a PVB film, which may advantageously incorporate other functionalities as described above in the first embodiment.
- the external face of the substrate 10 to the outside of the structure, is preferably provided with an antireflection coating 50 .
- the invention therefore relates to the multilayer 20 deposited on a substrate, such as the substrate 10 .
- This multilayer includes three metallic silver layers, Ag 1 being the layer closest to the substrate, Ag 2 being the central layer and Ag 3 being the one furthest away, the function of which is to reflect the electromagnetic waves having a frequency between 30 MHz and 1 GHz and infrared waves beyond 800 nm.
- the multilayer includes, deposited alternately on the substrate, a titanium dioxide layer 21 , a layer 22 of a metal oxide, consisting of zinc oxide, one of the silver layers Ag 1 , Ag 2 or Ag 3 , and a layer 23 of a sacrificial metal coating.
- a titanium dioxide layer 21 deposited alternately on the substrate, a titanium dioxide layer 21 , a layer 22 of a metal oxide, consisting of zinc oxide, one of the silver layers Ag 1 , Ag 2 or Ag 3 , and a layer 23 of a sacrificial metal coating.
- an antireflection layer 24 consisting of at least one metal oxide.
- each of the silver layers Ag 1 , Ag 2 and Ag 3 is between 13 nm and 19 nm.
- the thicknesses e Ag1 , e Ag2 and e Ag3 of the respective layers Ag 1 , Ag 2 and Ag 3 may be identical or they may vary in a ratio of between 0.8 and 1.2 and are such that e Ag1 ⁇ e Ag3 ⁇ e Ag2 .
- the imbalance in layer thicknesses is preferential, so as to lower the light reflection while maintaining the same surface resistance.
- the titanium oxide layer 21 as sublayer for the silver layer Ag 1 close to the substrate has a thickness of between 10 and 20 nm, preferably between 10 and 15 nm.
- the titanium oxide layers 21 as sublayers for the other two silver layers Ag 2 and Ag 3 have a thickness of between 35 and 55 nm, preferably between 40 and 50 nm.
- the zinc oxide layer 22 preferably has a thickness of greater than 15 nm, for example 16 or 18 nm.
- the sacrificial metal layer 23 is of niobium, titanium or zirconium, preferably titanium, and has a thickness of at most 2 nm, for example 1.5 nm.
- This sacrificial metal layer makes it possible to protect the silver against oxidation, and to improve its resistivity. Although the presence of titanium may degrade the light transmission, it does allow an even lower surface resistance to be obtained, while maintaining a sufficiently correct light transmission.
- the compromise to be found between the optical properties of the filter and its shielding properties is provided by giving preference to shielding, while still maintaining good optical properties.
- the surface resistance drops to 0.8 ⁇ / ⁇ , instead of 1.5 according to the prior art, which not only meets Class A of European Standard EN 55022, dealing with what are called “consumer” products, but also Class B, dealing with special products of the home-cinema type.
- the antireflection layer 24 for the silver layer Ag 3 remote from the substrate has a thickness of between 25 and 50 nm, preferably between 25 and 35 nm. It comprises at least titanium dioxide with a thickness of between 15 and 35 nm, preferably between 20 and 30 nm.
- deposited on top of the titanium dioxide of this antireflection layer is another metal oxide, of small thickness, between 5 and 15 nm, and preferably between 6 and 10 nm.
- This metal oxide is, for example, tin oxide (SnO 2 ) or silica nitride (Si 3 N 4 )—which helps to improve the purity of the colors in reflection and in transmission.
- All the layers of the multilayer are deposited on the substrate by the known technique of sputtering.
- the silver layers are the same and equal to 15 nm; the zinc oxide thicknesses are different, with a thickness of less than 15 nm, exactly equal to 10 nm in the case of example 5.
- the thickness of the titanium dioxide layers is fixed so as to optimize the optical properties of the multilayer.
- Examples 3 and 4 provide a comparison, with unequal thicknesses as regards the silver layers, with, in the case of example 4, an antireflection layer 25 based on SnO 2 . It may be seen that the imbalance has the advantage of reducing the light reflection but has the drawback of increasing the purity in transmission and in reflection; the addition of the antireflection layer helps to overcome this drawback and thus obtain a purity in transmission equivalent or substantially equivalent to that of examples 1, 2 and 5, and to reduce the purity in reflection compared with that of example 3.
- the filter obtained with reference to FIG. 1 or FIG. 2 has the following properties:
- the electromagnetic shielding filter using the substrate of the invention may be applied to a display screen, in particular a plasma display. It provides very good performance as regards shielding (the surface resistance being less than 1 ⁇ / ⁇ ), and it consequently blocks especially infrared with a transmission at 900 nm that does not exceed 1%. This filter also provides good visibility—a light transmission factor between 45 and 55%—and improves the contrast of the display.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Electromagnetism (AREA)
- Microelectronics & Electronic Packaging (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
- Laminated Bodies (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
- Surface Treatment Of Glass (AREA)
- Surface Treatment Of Optical Elements (AREA)
- Gas-Filled Discharge Tubes (AREA)
Abstract
A transparent substrate, especially made of glass, provided with a thin-film multilayer (20) that includes three silver layers (Ag1, Ag2, Ag3) and comprises, alternately on the substrate, a titanium dioxide layer (21), a metal oxide layer (22), one of the silver layers (Ag1, Ag2, Ag3) and a covering layer (23), characterized in that:
-
- the metal oxide is zinc oxide;
- the covering layer (23) is a sacrificial metal; and
- an antireflection layer (24) comprising at least one metal oxide is deposited on the covering layer (23) for the silver layer (Ag3) furthest away from the substrate.
Description
- The subject of the invention is a transparent substrate, especially made of glass, which is coated with a thin-film multilayer, comprising at least one metal layer, for electromagnetic shielding.
- The invention will be more particularly described for the use of such a substrate in a plasma display screen; however, it is not limited to such an application, it being possible for the substrate to be inserted into any electromagnetic shielding wall.
- A plasma display screen comprises a plasma gas mixture (Ne, Xe, Ar) trapped between two glass plates, and phosphors placed on the internal face of the rear plate of the display. Ultraviolet light radiation emitted by the plasma gas mixture during the plasma discharge between the two glass plates interacts with the phosphors on the internal face of the rear plate in order to produce the visible light radiation (red, green or blue). A gas particle deexcitation mechanism competes with the UV emission, which generates infrared radiation between 800 and 1250 nm, the propagation of which, mainly through the front face of the display, may be the source of very troublesome interference, especially as regards equipment located nearby and controlled by infrared, for example by means of remote controls.
- Moreover, like all electronic apparatus, plasma display screens possess addressing systems or drivers that may generate parasitic radiation which must not interfere with other devices, such as microcomputers, mobile telephones, etc.
- To eliminate, or at the very least attenuate, the propagation of such radiation, one solution consists in placing against the front face of the display a window, also called a filter, which is both transparent and metallized in order to provide electromagnetic shielding. This filter is, for example, a transparent substrate coated with thin silver-based layers that reflect the electromagnetic waves in the frequency range from 30 MHz to 1 GHz and infrared beyond 800 nm.
- Thus, patent FR 2 641 272 proposes a substrate comprising a reflective silver layer sandwiched between a transparent sublayer that comprises at least one layer of a metal oxide, and a transparent covering layer that comprises a layer of sacrificial metal oxide, a zinc oxide layer, the thickness of which does not exceed 15 nm, and an upper covering layer of a metal oxide.
- The silver layer preferably has a thickness of between 8 and 12 nm.
- The metal oxide layer of the sublayer may be chosen from several oxides and may be a mixture of several oxides. A preferred example is a titanium dioxide layer and a tin oxide layer deposited on said titanium dioxide.
- The object of the sacrificial metal oxide is to protect the silver layer from oxidation, in particular during its deposition when this is carried out by the technique of sputtering. This is because, if the silver were to be impaired, the coated substrate would lose its low emissivity and its light transmission would be greatly reduced. The sacrificial metal often preferred is titanium, as it provides the silver with very effective protection against oxidation and has the advantage of being easily oxidized, to form an oxide of very low absorbency.
- The zinc oxide layer serves as protection against the penetration of oxygen into the lower layers and allows the thickness of sacrificial metal to be reduced somewhat, this metal then being more easily, more completely and more uniformly oxidized. The above document requires a limited thickness for the zinc oxide layer of 15 nm, in particular so as to give the layer good light transmission properties.
- However, such a substrate with a single metal layer is not suitable for obtaining sufficient electromagnetic shielding, such as to have a surface resistance of less than 1.8Ω/□. Furthermore, other patent applications propose multilayers containing a plurality of metal layers, in particular silver layers. However, it is known that increasing the number of layers reduces the light transmission; a compromise between thicknesses and types of layer must therefore be found in order to achieve satisfactory light transmission.
- The patent application published under WO 01/81262 proposes a multilayer having two silver layers, with a thickness e1 in the case of the silver layer closest to the substrate and a thickness e2 for the other layer, a sacrificial metal oxide, such as titanium oxide, being placed above each silver layer in order to protect it. One example of a sequence is the following:
-
- substrate/Si3N4/ZnO/Ag/Ti/Si3N4/ZnO/Ag/Ti/ZnO/Si3N4.
- To achieve a surface resistance of less than 1.8Ω/□, while still maintaining a suitable light transmission, the ratio of the thicknesses e1/e2 is between 0.8 and 1.1, preferably between 0.9 and 1, and the total thickness of the metal layers, e1+e2, is between 27.5 and 30 nm, preferably between 28 and 29.5 nm.
- European patent application EP 1 155 816 discloses a multilayer having three, or even four, silver layers with an alternation of a titanium oxide layer and of a layer having a refractive index of less than 2.4 at a wavelength of 550 nm, such as for example zinc oxide or preferably silica nitride. The thickness of the silver layer closest to the substrate and of that furthest away is preferably equal to 0.5 to 1 times the thickness of the other silver layer. An example of a sequence having a surface resistance of 1.5Ω/□, with a light transmission of 67%, is given with three palladium-doped silver layers each having a thickness of 16 nm. This sequence is the following:
-
- substrate/TiOx/SiNx/Ag/SiNx/TiOx/SiNx/Ag/SiNx/TiOx/SiNx/Ag/SiNx/TiOx.
- However, it is always desirable for the properties of existing solutions to be further improved, and thus obtain an even more substantial reduction in surface resistance without degrading the light transmission.
- The object of the invention is therefore to find another filter solution, especially for a plasma display screen, in order to alleviate the problem of electromagnetic wave transmission, while still achieving satisfactory optical properties.
- According to the invention, the transparent substrate, especially made of glass, provided with a thin-film multilayer that includes three silver layers and comprises, alternately on the substrate, a titanium dioxide layer, a metal oxide layer, one of the silver layers and a covering layer, characterized in that:
-
- the metal oxide is zinc oxide;
- the covering layer is a sacrificial metal; and
- an antireflection layer comprising at least one metal oxide is deposited on the covering layer for the silver layer furthest away from the substrate.
- According to one feature, the thickness of each of the silver layers is between 13 nm and 19 nm. The thicknesses (eAg1, eAg2, eAg3) of the three respective layers (Ag1, Ag2, Ag3) are identical, or else they vary in a ratio of between 0.8 and 1.2 and are such that eAg1≦eAg3≦eAg2.
- According to another feature, the titanium dioxide layer as sublayer for the silver layer (Ag1) closest to the substrate has a thickness of between 10 and 20 nm, preferably between 10 and 15 nm, and the titanium oxide layers as sublayers for the other two silver layers (Ag2, Ag3) have a thickness of between 35 and 55 nm, preferably between 40 and 50 nm.
- Preferably, the zinc oxide layer has a thickness of greater than 15 nm.
- Advantageously, the sacrificial metal layer is of niobium, titanium or zirconium, and has a thickness not exceeding 2 nm.
- According to another feature, the antireflection layer has a thickness of between 25 and 50 nm, preferably between 25 and 35 nm. Advantageously, this antireflection layer includes at least one titanium dioxide layer having a thickness of between 15 and 35 nm, preferably between 20 and 30 nm, and may also include another layer of a metal oxide that is deposited on said titanium dioxide layer and has a thickness of between 5 and 15 nm, preferably between 6 and 10 nm. This metal oxide layer is preferably tin oxide (SnO2) or silicon nitride (Si3N4).
- With such features, the substrate according to the invention has a surface resistance not exceeding 1Ω/□, preferably between 0.7 and 0.9 Ω/□.
- The substrate may be made of toughened or untoughened glass, or made of plastic.
- It will be advantageous to use such a substrate in an electromagnetic shielding filter, applied for example to a display screen of the plasma display type. This filter therefore comprises a substrate provided with the multilayer of the invention, together with one or more functional plastic sheets (for example with pigments or dyes) and/or another transparent substrate, optionally coated with an antireflection layer, so as to have the following optical properties:
-
- a light transmission factor TL of between 45 and 55%;
- a purity of less than 10% in transmission;
- a light reflection RL of less than 5%, preferably less than 4%;
- a predominantly violet-blue color in reflection with a purity of less than 20%;
- a predominantly blue color in transmission.
- Other features and advantages of the invention will now be described with regard to the appended drawings, in which:
-
FIG. 1 illustrates a first embodiment of an electromagnetic shielding filter; -
FIG. 2 illustrates a second embodiment of an electromagnetic shielding filter; and -
FIG. 3 illustrates schematically the multilayer of the invention. - It should firstly be pointed out that the proportions relating to the various dimensions, especially thicknesses, of the elements of the invention have not been drawn to scale in the figures so that they are easier to read.
-
FIG. 1 illustrates a first example of an embodiment of the transparent structure 1 intended to be joined to the front face of a plasma display in order to form an optical and electromagnetic shielding filter. - The structure 1 comprises a first
transparent substrate 10, which for example is of the glass type but which could, as a variant, be made of plastic, intended to be placed on the same side as the display, a thin-film multilayer 20 according to the invention, which is placed on the internal face of thesubstrate 10, facing the inside of the structure, asecond substrate 30 of the glass type, which is joined to the first substrate, facing themultilayer 20, by means of aplastic film 40, such as a PVB film. This functional plastic film may advantageously include a mineral pigment or an organic dye so as to filter the orange color of wavelength centered on 590 nm. The reader may refer for further details about the plastic film or alternative embodiments of the structure to French patent application FR 03/04636. - The external faces of the
substrates antireflection coating 50. -
FIG. 2 illustrates a second example of an embodiment of the structure 1, which in this case comprises asubstrate 10 one of the faces of which, intended to be on the opposite side from the observer, is provided with the thin-film multilayer 20, and asubstrate 60 made of plastic, such as PET, which is intended to be placed on the same side as the display and is joined to thesubstrate 10, facing themultilayer 20, by means of aplastic film 40, such as a PVB film, which may advantageously incorporate other functionalities as described above in the first embodiment. The external face of thesubstrate 10, to the outside of the structure, is preferably provided with anantireflection coating 50. - The invention therefore relates to the
multilayer 20 deposited on a substrate, such as thesubstrate 10. This multilayer includes three metallic silver layers, Ag1 being the layer closest to the substrate, Ag2 being the central layer and Ag3 being the one furthest away, the function of which is to reflect the electromagnetic waves having a frequency between 30 MHz and 1 GHz and infrared waves beyond 800 nm. - The multilayer includes, deposited alternately on the substrate, a
titanium dioxide layer 21, alayer 22 of a metal oxide, consisting of zinc oxide, one of the silver layers Ag1, Ag2 or Ag3, and alayer 23 of a sacrificial metal coating. Deposited on top of thesacrificial metal layer 23, which is deposited on the silver layer Ag3 furthest from the substrate, is anantireflection layer 24 consisting of at least one metal oxide. - The thickness of each of the silver layers Ag1, Ag2 and Ag3 is between 13 nm and 19 nm. The thicknesses eAg1, eAg2 and eAg3 of the respective layers Ag1, Ag2 and Ag3 may be identical or they may vary in a ratio of between 0.8 and 1.2 and are such that eAg1≦eAg3≦eAg2. The imbalance in layer thicknesses is preferential, so as to lower the light reflection while maintaining the same surface resistance.
- The
titanium oxide layer 21 as sublayer for the silver layer Ag1 close to the substrate has a thickness of between 10 and 20 nm, preferably between 10 and 15 nm. - The titanium oxide layers 21 as sublayers for the other two silver layers Ag2 and Ag3 have a thickness of between 35 and 55 nm, preferably between 40 and 50 nm.
- The
zinc oxide layer 22 preferably has a thickness of greater than 15 nm, for example 16 or 18 nm. - The
sacrificial metal layer 23 is of niobium, titanium or zirconium, preferably titanium, and has a thickness of at most 2 nm, for example 1.5 nm. - This sacrificial metal layer makes it possible to protect the silver against oxidation, and to improve its resistivity. Although the presence of titanium may degrade the light transmission, it does allow an even lower surface resistance to be obtained, while maintaining a sufficiently correct light transmission. The compromise to be found between the optical properties of the filter and its shielding properties is provided by giving preference to shielding, while still maintaining good optical properties. Thus, with the sequence of the invention based on three silver layers, the surface resistance drops to 0.8Ω/□, instead of 1.5 according to the prior art, which not only meets Class A of European Standard EN 55022, dealing with what are called “consumer” products, but also Class B, dealing with special products of the home-cinema type.
- The
antireflection layer 24 for the silver layer Ag3 remote from the substrate has a thickness of between 25 and 50 nm, preferably between 25 and 35 nm. It comprises at least titanium dioxide with a thickness of between 15 and 35 nm, preferably between 20 and 30 nm. - Advantageously, deposited on top of the titanium dioxide of this antireflection layer is another metal oxide, of small thickness, between 5 and 15 nm, and preferably between 6 and 10 nm. This metal oxide is, for example, tin oxide (SnO2) or silica nitride (Si3N4)—which helps to improve the purity of the colors in reflection and in transmission.
- All the layers of the multilayer are deposited on the substrate by the known technique of sputtering.
- In the table below, we given give five examples (Ex 1 to Ex 5) of the
multilayer 20 of the invention. Provided in the table are the thicknesses (in nm) of each layer and, for each multilayer joined to asubstrate 10, the values of the light transmission TL (in %), the light reflection RL (in %), the purity in transmission pe in T (in %), the purity in reflection pe in R (in %), the dominant wavelengths in transmission and in reflection, respectively λd in T and λd in R (in nm) and the surface resistance Rsurf (in Ω/□). - These five examples make it possible to achieve suitable shielding less than 1 Ω/□.
- In the case of examples 1, 2 and 5, the silver layers are the same and equal to 15 nm; the zinc oxide thicknesses are different, with a thickness of less than 15 nm, exactly equal to 10 nm in the case of example 5. For each example, the thickness of the titanium dioxide layers is fixed so as to optimize the optical properties of the multilayer.
- The results show that, for examples 1 and 2 which have larger zinc oxide thicknesses than example 5 (from 6 to 8 nm and higher), the light transmission, contrary to what might be expected as regards the prior art, remains substantially the same and even slightly better in the case of example 1 with a zinc oxide thickness of 18 nm, and the reflection has the advantage, in the case of examples 1 and 2, of being lower than in the case of example 5, thereby making it possible for the display to be illuminated less brightly and aggressively for the observer.
- Examples 3 and 4 provide a comparison, with unequal thicknesses as regards the silver layers, with, in the case of example 4, an antireflection layer 25 based on SnO2. It may be seen that the imbalance has the advantage of reducing the light reflection but has the drawback of increasing the purity in transmission and in reflection; the addition of the antireflection layer helps to overcome this drawback and thus obtain a purity in transmission equivalent or substantially equivalent to that of examples 1, 2 and 5, and to reduce the purity in reflection compared with that of example 3.
-
Ex 1 Ex 2 Ex 3 Ex 4 Ex 5 TiO2 12 12 12 12 13 ZnO 18 16 16 16 10 Ag1 15 15 13.5 13.5 15 Ti 1.5 1.5 1.5 1.5 1.6 TiO2 43 43 43 43 48 ZnO 18 16 16 16 10 Ag2 15 15 16.5 16.5 15 Ti 1.5 1.5 1.5 1.5 1.5 TiO2 43 43 43 43 48 ZnO 18 16 16 16 10 Ag3 15 15 15 15 15 Ti 1.5 1.5 1.5 1.5 1.5 TiO2 25 25 25 25 25 SnO2 0 0 0 7 0 TL in % 62 61 62 65 61 RL in % 5.8 5.0 4.7 4.7 6 pe in T (%) 5 6 9 6 5 λd in T (nm) 500 490 496 499 500 pe in R (%) 30 20 50 40 30 λd in R (nm) −555 −560 −553 −547 −555 Rsurf (Ω/□) 0.8 0.8 0.8 0.8 0.8 - Thus, by controlling the deposition of the silver and dielectric layers and the thicknesses formulated according to the invention, and also by the use of metal protection layers, the filter obtained with reference to
FIG. 1 orFIG. 2 has the following properties: -
- a surface resistance of less than 1 Ω/□;
- a light transmission factor TL of between 45 and 55%;
- a purity in transmission of less than 10%;
- a light reflection RL of less than 5%, preferably less than 4%;
- a predominantly violet-blue color in reflection with a purity of less than 20%; and
- a predominantly blue color in transmission.
- The electromagnetic shielding filter using the substrate of the invention may be applied to a display screen, in particular a plasma display. It provides very good performance as regards shielding (the surface resistance being less than 1Ω/□), and it consequently blocks especially infrared with a transmission at 900 nm that does not exceed 1%. This filter also provides good visibility—a light transmission factor between 45 and 55%—and improves the contrast of the display.
Claims (15)
1. A transparent substrate, especially made of glass, provided with a thin-film multilayer (20) that includes three silver layers (Ag1, Ag2, Ag3) and comprises, alternately on the substrate, a titanium dioxide layer (21), a metal oxide layer (22), one of the silver layers (Ag1, Ag2, Ag3) and a covering layer (23), characterized in that:
the metal oxide is zinc oxide;
the covering layer (23) is a sacrificial metal; and
an antireflection layer (24) comprising at least one metal oxide is deposited on the covering layer (23) for the silver layer (Ag3) furthest away from the substrate.
2. The substrate as claimed in claim 1 , characterized in that the thickness of each of the silver layers (Ag1, Ag2, Ag3) is between 13 nm and 19 nm.
3. The substrate as claimed in claim 2 , characterized in that the thicknesses (eAg1, eAg2, eAg3) of the respective layers (Ag1, Ag2, Ag3) are identical, or else they vary in a ratio of between 0.8 and 1.2 and are such that eAg1≦eAg3≦eAg2.
4. The substrate as claimed in one of claims 1 to 3 , characterized in that the titanium dioxide layer (21) as sublayer for the silver layer (Ag1) closest to the substrate has a thickness of between 10 and 20 nm, preferably between 10 and 15 nm, and the titanium oxide layers (21) as sublayers for the other two silver layers (Ag2, Ag3) have a thickness of between 35 and 55 nm, preferably between 40 and 50 nm.
5. The substrate as claimed in any one of the preceding claims, characterized in that the zinc oxide layer (22) has a thickness of greater than 15 nm.
6. The substrate as claimed in any one of the preceding claims, characterized in that the sacrificial metal layer (23) is of niobium (Nb), titanium (Ti) or zirconium (Zr).
7. The substrate as claimed in any one of the preceding claims, characterized in that the sacrificial metal layer (23) has a thickness not exceeding 2 nm.
8. The substrate as claimed in any one of the preceding claims, characterized in that the antireflection layer (24) has a thickness of between 25 and 50 nm, preferably between 25 and 35 nm.
9. The substrate as claimed in claim 8 , characterized in that the antireflection layer (24) includes at least one titanium dioxide layer having a thickness of between 15 and 35 nm, preferably between 20 and 30 nm.
10. The substrate as claimed in either of claims 8 or 9 , characterized in that the antireflection layer (24) includes a titanium dioxide layer and another layer of a metal oxide that is deposited on said titanium dioxide layer and has a thickness of between 5 and 15 nm, preferably between 6 and 10 nm.
11. The substrate as claimed in claim 10 , characterized in that the metal oxide layer of the antireflection layer (24) is tin oxide (SnO2) or silica nitride (Si3N4).
12. The substrate as claimed in any one of the preceding claims, characterized in that it has a surface resistance not exceeding 1Ω/□, preferably between 0.7 and 0.9 Ω/□.
13. The substrate as claimed in any one of the preceding claims, characterized in that it is made of toughened or untoughened glass, or made of plastic.
14. An electromagnetic shielding filter comprising a substrate as claimed in any one of the preceding claims, characterized in that it has the following optical properties:
a light transmission factor TL of between 45 and 55%;
a purity of less than 10% in transmission;
a light reflection RL of less than 5%, preferably less than 4%;
a predominantly violet-blue color in reflection with a purity of less than 20%;
a predominantly blue color in transmission.
15. A display screen of the plasma display type incorporating, on its front face, at least one substrate or filter as claimed in any one of claims 1 to 14.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/234,881 US20090015909A1 (en) | 2003-09-17 | 2008-09-22 | Transparent substrate comprising a stack of thin layers for electromagnetic armour |
Applications Claiming Priority (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0310912A FR2859721B1 (en) | 2003-09-17 | 2003-09-17 | TRANSPARENT SUBSTRATE WITH THIN FILM STACK FOR ELECTROMAGNETIC SHIELDING |
FR0310912 | 2003-09-17 | ||
PCT/FR2004/002152 WO2005028391A1 (en) | 2003-09-17 | 2004-08-18 | Transparent substrate comprising a stack of thin layers for electromagnetic armour |
US10/572,286 US7452603B2 (en) | 2003-09-17 | 2004-08-18 | Transparent substrate comprising a stack of thin layers for electromagnetic armour |
US12/234,881 US20090015909A1 (en) | 2003-09-17 | 2008-09-22 | Transparent substrate comprising a stack of thin layers for electromagnetic armour |
Related Parent Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/572,286 Continuation US7452603B2 (en) | 2003-09-17 | 2004-08-18 | Transparent substrate comprising a stack of thin layers for electromagnetic armour |
PCT/FR2004/002152 Continuation WO2005028391A1 (en) | 2003-09-17 | 2004-08-18 | Transparent substrate comprising a stack of thin layers for electromagnetic armour |
Publications (1)
Publication Number | Publication Date |
---|---|
US20090015909A1 true US20090015909A1 (en) | 2009-01-15 |
Family
ID=34203512
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/572,286 Expired - Fee Related US7452603B2 (en) | 2003-09-17 | 2004-08-18 | Transparent substrate comprising a stack of thin layers for electromagnetic armour |
US12/234,881 Abandoned US20090015909A1 (en) | 2003-09-17 | 2008-09-22 | Transparent substrate comprising a stack of thin layers for electromagnetic armour |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/572,286 Expired - Fee Related US7452603B2 (en) | 2003-09-17 | 2004-08-18 | Transparent substrate comprising a stack of thin layers for electromagnetic armour |
Country Status (11)
Country | Link |
---|---|
US (2) | US7452603B2 (en) |
EP (1) | EP1663897B1 (en) |
JP (1) | JP4800947B2 (en) |
KR (1) | KR101148039B1 (en) |
CN (1) | CN1852871B (en) |
AT (1) | ATE441624T1 (en) |
DE (1) | DE602004022955D1 (en) |
FR (1) | FR2859721B1 (en) |
MX (1) | MXPA06002831A (en) |
PL (1) | PL1663897T3 (en) |
WO (1) | WO2005028391A1 (en) |
Cited By (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20110133640A1 (en) * | 2008-08-21 | 2011-06-09 | Guardian Industries Corp. | Plasma display panel including EMI filter, and/or method of making the same |
US20110236663A1 (en) * | 2003-11-28 | 2011-09-29 | Saint-Gobain Glass France | Transparent substrate which can be used alternatively or cumulatively, for thermal control, for electromagnetic armour and for heated glazing |
CN103264549A (en) * | 2013-05-17 | 2013-08-28 | 中国南玻集团股份有限公司 | Infrared ray shielding glass with front surface and side surface having consistent reflection hues |
US20140193616A1 (en) * | 2010-03-29 | 2014-07-10 | Ppg Industries Ohio, Inc. | Tempered And Non-Tempered Glass Coatings Having Similar Optical Characteristics |
US9215760B2 (en) | 2012-01-10 | 2015-12-15 | Saint-Gobain Glass France | Transparent pane with electrically conductive coating |
US9359807B2 (en) | 2012-01-10 | 2016-06-07 | Saint-Gobain Glass France | Transparent panel with electrically conductive coating |
US20170075045A1 (en) * | 2015-09-16 | 2017-03-16 | Ppg Industries Ohio, Inc. | Solar mirrors and methods of making solar mirrors having improved properties |
US9599752B2 (en) | 2011-01-06 | 2017-03-21 | Saint-Gobain Glass France | Substrate provided with a multilayer coating having thermal properties, in particular for production of a heated glazing unit |
US20170308713A1 (en) * | 2016-04-22 | 2017-10-26 | International Business Machines Corporation | Context-Driven On-Device Data Protection |
US10358384B2 (en) | 2010-03-29 | 2019-07-23 | Vitro, S.A.B. De C.V. | Solar control coatings with discontinuous metal layer |
US10391744B2 (en) | 2015-06-19 | 2019-08-27 | Agc Glass Europe | Laminated glazing for solar control |
US10654749B2 (en) | 2010-03-29 | 2020-05-19 | Vitro Flat Glass Llc | Solar control coatings providing increased absorption or tint |
US10654747B2 (en) | 2010-03-29 | 2020-05-19 | Vitro Flat Glass Llc | Solar control coatings with subcritical copper |
US11078718B2 (en) | 2018-02-05 | 2021-08-03 | Vitro Flat Glass Llc | Solar control coatings with quadruple metallic layers |
Families Citing this family (41)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2006327177A (en) * | 2005-04-26 | 2006-12-07 | Tokai Rubber Ind Ltd | Transparent laminated film, transparent laminate and plasma display |
FR2889182B1 (en) * | 2005-07-29 | 2007-10-26 | Saint Gobain | GLAZING PROVIDED WITH A STACK OF THIN LAYERS ACTING ON SOLAR RADIATION |
US7342716B2 (en) * | 2005-10-11 | 2008-03-11 | Cardinal Cg Company | Multiple cavity low-emissivity coatings |
US7339728B2 (en) | 2005-10-11 | 2008-03-04 | Cardinal Cg Company | Low-emissivity coatings having high visible transmission and low solar heat gain coefficient |
US7572511B2 (en) * | 2005-10-11 | 2009-08-11 | Cardinal Cg Company | High infrared reflection coatings |
FR2892409B1 (en) * | 2005-10-25 | 2007-12-14 | Saint Gobain | PROCESS FOR TREATING A SUBSTRATE |
KR100926233B1 (en) * | 2006-05-30 | 2009-11-09 | 삼성코닝정밀유리 주식회사 | Pdp filter having multi-layer thin film and method for manufacturing the same |
JP4935215B2 (en) * | 2006-07-18 | 2012-05-23 | 日亜化学工業株式会社 | Light emitting device |
JP4982149B2 (en) * | 2006-10-25 | 2012-07-25 | 東海ゴム工業株式会社 | Transparent laminated film and transparent laminated body |
JPWO2008065962A1 (en) * | 2006-11-27 | 2010-03-04 | 独立行政法人産業技術総合研究所 | Visible light transmission heat ray reflective sheet |
FR2911130B1 (en) * | 2007-01-05 | 2009-11-27 | Saint Gobain | THIN FILM DEPOSITION METHOD AND PRODUCT OBTAINED |
US8025957B2 (en) | 2007-05-09 | 2011-09-27 | Ppg Industries Ohio, Inc. | Vehicle transparency |
EP2183102B1 (en) * | 2007-08-24 | 2018-03-14 | Vitro, S.A.B. de C.V. | Vehicle transparency |
US8658289B2 (en) | 2007-11-16 | 2014-02-25 | Ppg Industries Ohio, Inc. | Electromagnetic radiation shielding device |
DE102007061419A1 (en) * | 2007-12-20 | 2009-06-25 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Transparent plastic film for shielding electromagnetic waves and method for producing such a plastic film |
US7713633B2 (en) * | 2008-05-27 | 2010-05-11 | Guardian Industries Corp. | EMI filter for plasma display panel |
FR2936510B1 (en) * | 2008-09-30 | 2019-08-30 | Saint-Gobain Glass France | SUBSTRATE PROVIDED WITH A STACK WITH THERMAL PROPERTIES, ESPECIALLY FOR REALIZING A HEATED GLAZING. |
KR101056438B1 (en) * | 2008-12-05 | 2011-08-11 | 삼성에스디아이 주식회사 | Display panel and optical filter |
BE1019345A3 (en) | 2010-05-25 | 2012-06-05 | Agc Glass Europe | SOLAR CONTROL GLAZING WITH LOW SOLAR FACTOR. |
GB201106788D0 (en) * | 2011-04-21 | 2011-06-01 | Pilkington Group Ltd | Heat treatable coated glass pane |
FR2985724B1 (en) * | 2012-01-16 | 2014-03-07 | Saint Gobain | SUBSTRATE PROVIDED WITH A STACK WITH THERMAL PROPERTIES COMPRISING FOUR METAL FUNCTIONAL LAYERS. |
WO2013109582A1 (en) * | 2012-01-17 | 2013-07-25 | Cardinal Cg Company | Low solar transmittance coatings |
US9279910B2 (en) * | 2013-03-13 | 2016-03-08 | Intermolecular, Inc. | Color shift of high LSG low emissivity coating after heat treatment |
US9790127B2 (en) * | 2013-03-14 | 2017-10-17 | Intermolecular, Inc. | Method to generate high LSG low-emissivity coating with same color after heat treatment |
FR3005048B1 (en) * | 2013-04-30 | 2020-09-25 | Saint Gobain | SUBSTRATE EQUIPPED WITH A STACKING WITH THERMAL PROPERTIES |
US8940400B1 (en) | 2013-09-03 | 2015-01-27 | Guardian Industries Corp. | IG window unit including double silver coating having increased SHGC to U-value ratio, and corresponding coated article for use in IG window unit or other window |
CN104609740B (en) * | 2015-02-04 | 2018-04-10 | 中国建筑材料科学研究总院 | Can monolithic using sunlight controlling coated glass and preparation method thereof |
FR3038597B1 (en) * | 2015-07-08 | 2021-12-10 | Saint Gobain | MATERIAL EQUIPPED WITH A THERMAL PROPERTIES STACK |
FR3051804B1 (en) * | 2016-05-24 | 2018-06-29 | Saint-Gobain Glass France | THIN LAYER DEPOSITION METHOD |
CN106435475B (en) * | 2016-09-08 | 2018-09-14 | 江苏双星彩塑新材料股份有限公司 | A kind of energy saving fenestrated membrane of blue-green three-silver low radiation and preparation method thereof |
CN106637108B (en) * | 2016-09-08 | 2019-01-25 | 江苏双星彩塑新材料股份有限公司 | High heat-insulating and energy-saving fenestrated membranes of a kind of indigo pair silver and preparation method thereof |
EP3514583B1 (en) * | 2016-09-15 | 2020-12-09 | Central Glass Company, Limited | Sunlight shielding member |
FR3056579B1 (en) * | 2016-09-26 | 2021-02-12 | Saint Gobain | SUBSTRATE COATED WITH A LOW-EMISSIVE COATING |
FR3056580B1 (en) * | 2016-09-26 | 2021-02-12 | Saint Gobain | SUBSTRATE COATED WITH A LOW-EMISSIVE COATING |
US10556823B2 (en) | 2017-06-20 | 2020-02-11 | Apple Inc. | Interior coatings for glass structures in electronic devices |
FR3069241B1 (en) * | 2017-07-21 | 2022-02-04 | Saint Gobain | MATERIAL COMPRISING A STACK WITH THERMAL PROPERTIES |
FR3082198B1 (en) * | 2018-06-12 | 2020-06-26 | Saint-Gobain Glass France | MATERIAL COMPRISING A STACK WITH THERMAL AND AESTHETIC PROPERTIES |
FR3082199B1 (en) * | 2018-06-12 | 2020-06-26 | Saint-Gobain Glass France | MATERIAL COMPRISING A STACK WITH THERMAL AND AESTHETIC PROPERTIES |
JP6748150B2 (en) * | 2018-06-14 | 2020-08-26 | ファナック株式会社 | Galvano mirror and laser processing equipment |
CN112888288B (en) * | 2021-01-18 | 2022-10-28 | 哈尔滨工业大学 | Electromagnetic shielding curved surface optical window based on ultrathin doped metal/medium composite structure |
CN114719683A (en) * | 2022-04-01 | 2022-07-08 | 江苏铁锚玻璃股份有限公司 | Silver-based electromagnetic shielding and electromagnetic stealth film system structure |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5948538A (en) * | 1996-11-21 | 1999-09-07 | Saint-Gobain Village | Glazing assembly comprising a substrate provided with a stack of thin layers for solar protection and/or thermal insulation |
US6316110B1 (en) * | 1998-04-16 | 2001-11-13 | Nippon Sheet Glass Co., Ltd. | Electromagnetic wave filter for plasma display panel |
US6391462B1 (en) * | 1999-08-06 | 2002-05-21 | Samsung Sdi. Co., Ltd. | Optical filter for plasma display |
US20030049464A1 (en) * | 2001-09-04 | 2003-03-13 | Afg Industries, Inc. | Double silver low-emissivity and solar control coatings |
US6572940B1 (en) * | 1997-06-25 | 2003-06-03 | Flachglas Aktiengesellschaft | Coatings with a silver layer |
US20030180547A1 (en) * | 2002-02-11 | 2003-09-25 | Harry Buhay | Solar control coating |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CA1331867C (en) * | 1986-12-29 | 1994-09-06 | James Joseph Finley | Low emissivity film for high temperature processing |
GB8900166D0 (en) * | 1989-01-05 | 1989-03-01 | Glaverbel | Glass coating |
JP3373298B2 (en) * | 1993-08-20 | 2003-02-04 | 旭硝子株式会社 | Functional article and manufacturing method thereof |
JP3549761B2 (en) * | 1999-02-26 | 2004-08-04 | セントラル硝子株式会社 | Substrate with electromagnetic wave shielding film |
JP2001146438A (en) * | 1999-11-16 | 2001-05-29 | Asahi Breweries Ltd | Method for treating outer surface of glass bottle and the resultant glass bottle |
JP2002072897A (en) * | 2000-08-25 | 2002-03-12 | Fuji Photo Film Co Ltd | Electromagnetic wave shieldable transparent film |
JP2003133787A (en) * | 2001-10-26 | 2003-05-09 | Central Glass Co Ltd | Substrate with electromagnetic wave shielding film |
-
2003
- 2003-09-17 FR FR0310912A patent/FR2859721B1/en not_active Expired - Fee Related
-
2004
- 2004-08-18 KR KR1020067004999A patent/KR101148039B1/en active IP Right Grant
- 2004-08-18 PL PL04786318T patent/PL1663897T3/en unknown
- 2004-08-18 DE DE602004022955T patent/DE602004022955D1/en active Active
- 2004-08-18 US US10/572,286 patent/US7452603B2/en not_active Expired - Fee Related
- 2004-08-18 AT AT04786318T patent/ATE441624T1/en not_active IP Right Cessation
- 2004-08-18 EP EP04786318A patent/EP1663897B1/en not_active Not-in-force
- 2004-08-18 MX MXPA06002831A patent/MXPA06002831A/en active IP Right Grant
- 2004-08-18 CN CN2004800267040A patent/CN1852871B/en not_active Expired - Fee Related
- 2004-08-18 WO PCT/FR2004/002152 patent/WO2005028391A1/en active Application Filing
- 2004-08-18 JP JP2006526656A patent/JP4800947B2/en not_active Expired - Fee Related
-
2008
- 2008-09-22 US US12/234,881 patent/US20090015909A1/en not_active Abandoned
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5948538A (en) * | 1996-11-21 | 1999-09-07 | Saint-Gobain Village | Glazing assembly comprising a substrate provided with a stack of thin layers for solar protection and/or thermal insulation |
US6572940B1 (en) * | 1997-06-25 | 2003-06-03 | Flachglas Aktiengesellschaft | Coatings with a silver layer |
US6316110B1 (en) * | 1998-04-16 | 2001-11-13 | Nippon Sheet Glass Co., Ltd. | Electromagnetic wave filter for plasma display panel |
US6391462B1 (en) * | 1999-08-06 | 2002-05-21 | Samsung Sdi. Co., Ltd. | Optical filter for plasma display |
US20030049464A1 (en) * | 2001-09-04 | 2003-03-13 | Afg Industries, Inc. | Double silver low-emissivity and solar control coatings |
US20030180547A1 (en) * | 2002-02-11 | 2003-09-25 | Harry Buhay | Solar control coating |
Cited By (28)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20110236663A1 (en) * | 2003-11-28 | 2011-09-29 | Saint-Gobain Glass France | Transparent substrate which can be used alternatively or cumulatively, for thermal control, for electromagnetic armour and for heated glazing |
US8440329B2 (en) | 2003-11-28 | 2013-05-14 | Saint-Gobain Glass France | Transparent substrate which can be used alternatively or cumulatively, for thermal control, for electromagnetic armour and for heated glazing |
US8592059B2 (en) | 2008-08-21 | 2013-11-26 | Guardian Industries Corp. | Plasma display panel including EMI filter, and/or method of making the same |
US20110133640A1 (en) * | 2008-08-21 | 2011-06-09 | Guardian Industries Corp. | Plasma display panel including EMI filter, and/or method of making the same |
US11267752B2 (en) | 2010-03-29 | 2022-03-08 | Vitro Flat Glass Llc | Solar control coating with discontinuous metal layer |
US10703673B2 (en) | 2010-03-29 | 2020-07-07 | Vitro Flat Glass Llc | Solar control coating with discontinuous metal layer |
US8865325B2 (en) * | 2010-03-29 | 2014-10-21 | Ppg Industries Ohio, Inc. | Tempered and non-tempered glass coatings having similar optical characteristics |
US11993536B2 (en) | 2010-03-29 | 2024-05-28 | Vitro Flat Glass Llc | Solar control coating with discontinuous metal layer |
US11891328B2 (en) | 2010-03-29 | 2024-02-06 | Vitro Flat Glass Llc | Solar control coatings providing increased absorption or tint |
US11401207B2 (en) | 2010-03-29 | 2022-08-02 | Vitro Flat Glass Llc | Solar control coatings providing increased absorption or tint |
US20140193616A1 (en) * | 2010-03-29 | 2014-07-10 | Ppg Industries Ohio, Inc. | Tempered And Non-Tempered Glass Coatings Having Similar Optical Characteristics |
US11286200B2 (en) | 2010-03-29 | 2022-03-29 | Vitro Flat Glass Llc | Solar control coatings with subcritical copper |
US10358384B2 (en) | 2010-03-29 | 2019-07-23 | Vitro, S.A.B. De C.V. | Solar control coatings with discontinuous metal layer |
US10981826B2 (en) | 2010-03-29 | 2021-04-20 | Vitro Flat Glass Llc | Solar control coatings with subcritical copper |
US10654749B2 (en) | 2010-03-29 | 2020-05-19 | Vitro Flat Glass Llc | Solar control coatings providing increased absorption or tint |
US10654748B2 (en) | 2010-03-29 | 2020-05-19 | Vitro Flat Glass Llc | Solar control coatings providing increased absorption or tint |
US10654747B2 (en) | 2010-03-29 | 2020-05-19 | Vitro Flat Glass Llc | Solar control coatings with subcritical copper |
US9599752B2 (en) | 2011-01-06 | 2017-03-21 | Saint-Gobain Glass France | Substrate provided with a multilayer coating having thermal properties, in particular for production of a heated glazing unit |
US9359807B2 (en) | 2012-01-10 | 2016-06-07 | Saint-Gobain Glass France | Transparent panel with electrically conductive coating |
US9215760B2 (en) | 2012-01-10 | 2015-12-15 | Saint-Gobain Glass France | Transparent pane with electrically conductive coating |
CN103264549A (en) * | 2013-05-17 | 2013-08-28 | 中国南玻集团股份有限公司 | Infrared ray shielding glass with front surface and side surface having consistent reflection hues |
US10391744B2 (en) | 2015-06-19 | 2019-08-27 | Agc Glass Europe | Laminated glazing for solar control |
US10942302B2 (en) * | 2015-09-16 | 2021-03-09 | Vitro Flat Glass Llc | Solar mirrors and methods of making solar mirrors having improved properties |
US20170075045A1 (en) * | 2015-09-16 | 2017-03-16 | Ppg Industries Ohio, Inc. | Solar mirrors and methods of making solar mirrors having improved properties |
US11415730B2 (en) | 2015-09-16 | 2022-08-16 | Vitro Flat Glass Llc | Solar mirrors and methods of making solar mirrors having improved properties |
US20170308713A1 (en) * | 2016-04-22 | 2017-10-26 | International Business Machines Corporation | Context-Driven On-Device Data Protection |
US11078718B2 (en) | 2018-02-05 | 2021-08-03 | Vitro Flat Glass Llc | Solar control coatings with quadruple metallic layers |
US11885174B2 (en) | 2018-02-05 | 2024-01-30 | Vitro Flat Glass Llc | Solar control coatings with quadruple metallic layers |
Also Published As
Publication number | Publication date |
---|---|
DE602004022955D1 (en) | 2009-10-15 |
FR2859721A1 (en) | 2005-03-18 |
CN1852871A (en) | 2006-10-25 |
PL1663897T3 (en) | 2010-02-26 |
US20060280951A1 (en) | 2006-12-14 |
WO2005028391A1 (en) | 2005-03-31 |
JP2007505810A (en) | 2007-03-15 |
US7452603B2 (en) | 2008-11-18 |
EP1663897B1 (en) | 2009-09-02 |
KR101148039B1 (en) | 2012-07-05 |
CN1852871B (en) | 2011-10-05 |
JP4800947B2 (en) | 2011-10-26 |
MXPA06002831A (en) | 2006-06-14 |
FR2859721B1 (en) | 2006-08-25 |
EP1663897A1 (en) | 2006-06-07 |
ATE441624T1 (en) | 2009-09-15 |
KR20060073955A (en) | 2006-06-29 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US7452603B2 (en) | Transparent substrate comprising a stack of thin layers for electromagnetic armour | |
US8048531B2 (en) | Protective plate for a plasma display and a method for producing the same | |
US20050074591A1 (en) | Transparent substrate with antiglare coating having abrasion-resistant properties | |
US7508586B2 (en) | Zinc-based film manipulation for an optical filter | |
JP5249413B2 (en) | Plasma display panel having TCEMI filter and / or manufacturing method thereof | |
JP2012500499A (en) | Plasma display panel having EMI filter without frame and / or manufacturing method of said plasma display | |
KR20030010501A (en) | Flat display panel | |
KR20110021854A (en) | Emi filter for plasma display panel | |
US20060055308A1 (en) | Plasma display filter with a dielectric/metallic layer stack of at least eleven layers | |
CZ20023552A3 (en) | Transparent board containing metal elements and use thereof | |
KR100840688B1 (en) | Multi-layer thin film structure of pdp filter | |
KR100618374B1 (en) | Pdp filter having structure of multi-layer thin film | |
KR20030093734A (en) | Multi-layer thin film structure of pdp filter | |
KR100578633B1 (en) | Front side filter for a plasma display panel having an improved transmittance | |
WO2004071146A1 (en) | Front filter |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |