Electrically conductive frame for electromagnetic shielding assemblies

Abstract

The present invention relates to a conductive frame (3), having a surface area and a rebate zone (3a) configured to receive a shielding glazing The rebate zone comprises a glazing contact zone (3b) and the glazing contact zone comprises a connection zone (3c). The conductive frame comprises (i) an anti-corrosion layer (Lcor) on the majority of the surface area and (ii) a non-conductive layer (Lnc). The non-conductive layer covers the anti-corrosion layer except in the connection zone; that is covered by a removable liner (8). The present invention also relates to associated methods and use.

Description

Electrically conductive frame for electromagnetic shielding assembliesTechnical Field

[0001] The invention concerns various domains where the electromagnetic waves / radiations need to be attenuated or blocked, for example for security / confidentiality reasons, for health reasons or any other reasons. Especially, the present invention relates to an electric conductive frame for use in an electromagnetic shielding assembly, notably for its insertion in a wall to achieve an electromagnetic shielded space.Background Art

[0002] Electromagnetic shielding panels are used to protect electronic devices, systems, volumes and spaces from electromagnetic interference (EMI). EMI is the electromagnetic disturbance generated by an external source that affects the normal operation of an electronic device or system or volume. This interference can be caused by a variety of sources, including power lines, radio waves, and other electronic devices.

[0003] EMI can cause a range of problems for electronic devices, including reduced performance, data loss and theft, eavesdropping / spying and even physical damage. Electromagnetic shielding panels are designed to block and / or absorb the electromagnetic waves that cause EMI, protecting the electronic device or system or volume from these issues.

[0004] Existing solutions for electromagnetic shielding panels / walls include using conductive materials such as copper, aluminium or steel. These materials block effectively electromagnetic waves. However, they are not transparent and cannot therefore be used for applications where it is needed to see through the shielding panel.

[0005] Electromagnetic shielding panels including a glazing element are known. The electromagnetic shielding performance is brought by the use of conductive metallic layers, e.g. a metallic thin film deposited on a glass sheet or a metallic mesh laminated between two glass sheets and polymer interlayer(s). In such panels, the number, natures and positions of the metallic layers to be used depend on the targeted shielding performances and also of the wavelengths to be blocked / attenuated.

[0006] In order to reach satisfying EMI shielding, it is required that the whole structure supporting the glazing such as its sash and frame, as well as the junction between the structure and the glazing, is also designed to block electromagnetic waves. Otherwise, electromagnetic leakage occurs and shielding performance decreases. In particular, to reach a good electromagnetic shielding performance for an assembly including a metallic frame enclosing a glazing, it is required to electrically couple at least one of the metallic layers of the glazing to the metallic frame.

[0007] Several solutions have been described in the art so far to electrically connect a shielding glazing with a metallic frame. For instance, patent JP04395018B2 describes the use of a conductive material acting as a gasket in the rebate portion of the frame to connect to the frame (i) a metallic mesh laminated inside two glass sheets and (ii) a coating. JP2000054754A describes an alternative way for connecting a shielding glazing to a metallic frame using an intermediate conductive material making the electrical junction.

[0008] Although there exists in the art, several solutions to connect a shielding glazing to a metallic frame, none of them tackles the impact of the frame painting on the shielding performance of the whole assemblies. Indeed, the use of a painted / lacquered metallic frame are common in the art for window assembly. However, such paints or lacquers are in general non-conductive / dielectric and therefore, even using a conductive gasket between the glazing and the frame, they represent a source of electromagnetic leakage and deteriorate the shielding performance of the entire assembly.

[0009] An easy and straightforward solution to solve this problem is to use a metallic frame painted with a conductive paint. However, such a specific paint involves many constraints, notably its high cost, its limited colour options and its brittleness.

[0010] Therefore, there is a need to provide an assembly including a painted metallic frame enclosing a shielding glazing which shows a very good shielding performance, while having a reasonable cost and also allowing an easy manufacturing process and flexibility regarding used paints, notably allowing using standard paints.Objectives of the invention

[0011] The present invention relates to a conductive frame that can support a shielding glazing. The present invention further relates to an electromagnetic shielding assembly comprising suchconductive frame and shielding glazing, that provide a see through (from outside and / or inside of the space) electromagnetic shielding assembly.

[0012] The electromagnetic shielded space achievable by the assembly of the invention relates to the space (or volume) of a stationary object; for example a room or compartment of a building or of a mobile object such as a vehicle, a rapid transit system such as a train, tram or alike.

[0013] The present intention also relates to associated manufacturing methods and uses.

[0014] An object of the present invention is therefore to provide a conductive frame that still demonstrate the anti-corrosion and aesthetic properties required from frames and that when combined with a shielding glazing, provides an electromagnetic shielding assembly of superior electromagnetic shielding performance.

[0015] Another objective of the invention is to provide a conductive frame and the corresponding electromagnetic shielding assembly including a shielding glazing, which are cost-effective and easy to manufacture.

[0016] Still another objective of the invention is to provide a conductive frame and the corresponding electromagnetic shielding assembly including a shielding glazing, which allows a high flexibility regarding frame paints and aesthetics.

[0017] Still another objective of the invention is to provide a specific painted metallic frame for its use in the electromagnetic shielding assembly and a manufacturing process thereof.

[0018] Finally, another objective of the invention is to provide a solution to the disadvantages of the prior art that is simpler and cheaper.Summary of the invention

[0019] The present invention relates, in a first aspect, to a conductive frame having a surface area and a rebate zone configured to receive a shielding glazing. The rebate zone comprises a glazing contact zone and the glazing contact zone comprises a connection zone. The conductive frame comprises a conductive anti-corrosion layer on the majority of the surface area and a non-conductive layer. The non-conductive layer covers the anti-corrosion layer except in the connection zone that is covered by a removable liner. In a preferred embodiment, the conductive frame further comprises a conductive element, preferably a conductive tape, located between the conductive anti-corrosionlayer and the removable liner. It is preferred that the conductive frame is a metallic frame, preferably an aluminium frame or a steel frame. It is preferred that the conductive anti-corrosion layer is a zinc- and / or aluminium-based layer.

[0020] In a second aspect, the present invention relates to an electromagnetic shielding assembly, comprising the conductive frame of the present invention wherein the removable liner has been removed; and a glazing comprising a glass pane comprising a conductive film, preferably at least two conductive films, and wherein the conductive film(s) are electrically connected to the conductive frame layer via the connection zone. The conductive film can be a coating system and / or a metallic meshed structure, preferably a woven metallic mesh, more preferably a metallic meshed structure.

[0021] The glazing can further comprise a conductive element connected to the conductive film, preferably made of a single piece. The conductive element can comprise a conductive strip, preferably a singlesided conductive tape. It is preferred that the conductive strip is folded back on at least one surface of the glazing. The electromagnetic shielding assembly can further comprise a conductive gasket between the conductive film of the glazing and the connection zone of the conductive frame.

[0022] In a third aspect, the present invention relates to a method of manufacturing a conductive frame, comprising the steps of : a) providing a framing structure having a surface area and a rebate zone configured to receive a shielding glazing; wherein the rebate zone comprises a glazing contact zone and wherein the glazing contact zone comprises a connection zone; the framing structure being conductive; b) optionally, cleaning the surface of the framing structure; c) applying a conductive anti-corrosive layer on the majority of the surface area of the framing structure; d) optionally, applying a primer on the majority of the surface area of the framing structure; e) applying a removable liner on the connection zone; f) applying a non-conductive layer on the majority of area surface of the framing structure; g) optionally, removing said removable liner.

[0023] In a fourth aspect, the present invention relates to an assembling method to assemble the electromagnetic shielding assembly; comprising the steps of: i. providing a conductive frame having and a rebate zone configured to receive a glazing; wherein the rebate zone comprises a glazing contact zone and wherein the glazing contact zone comprises a connection zone;ii. removing the removable liner; ill. providing a glazing comprising at least a conductive film, iv. installing the glazing in the rebate zone to connect the glazing to the glazing contact zone of the frame and to electrically connect the conductive film of the glazing to the connection zone of the frame.

[0024] It is noted that the invention relates to all possible combinations of features recited in the claims or in the described embodiments.

[0025] The following description relates to building applications, but it's understood that the invention may be applicable to others fields like automotive or transportation applications.Brief description of the drawings

[0026] This and other aspects of the present invention will now be described in more detail, with reference to the appended figures showing various exemplifying embodiments of the invention which are provided by way of illustration and not of limitation. The figures are a schematic representation and not true to scale. The figures do not restrict the invention in any way. More advantages will be explained with examples.

[0027] Figure 1 is a schematic cross sectional view of a conductive frame according to the present invention.

[0028] Figure 2 is a schematic top view of a conductive frame according to the present invention.

[0029] Figure 3 is another schematic cross sectional view of a conductive frame according to the present invention.

[0030] Each of Figures 4 to 8 illustrates schematic cross sectional views of some electromagnetic shielding assemblies according to the present invention.Detailed description of the inventionThe Conductive frame

[0031] The present invention relates to a conductive frame for use in an electromagnetic shielding assembly. Although many different ways to connect a shielding glazing to a frame have been described in the art, none tackles the impact of the frame painting on the shielding effectiveness of the window. Typically, the following painting process steps are achieved : a cleaning step to remove contaminants, a surface treatment for corrosion resistance, a primer application, and / or application of a finishing coating.

[0032] It has been found that despites the use of conductive gaskets between the glazing and the frame, some of the corrosion resistance treatment and most primer and finish coating typically used on metallic frames, are non-conductive and create sources of electromagnetic leakage and thereby reduce the shielding effectiveness of the window.

[0033] As illustrated in Figure 1, the present invention relates to a conductive frame (3) having surface area and a rebate zone (3a) configured to receive a glazing (2). The rebate zone comprises a glazing contact zone (3b). The glazing contact zone comprises a connection zone (3c). The frame comprise a conductive anti-corrosion layer (Lcor) on the majority of the surface area and a non-conductive layer (Lnc). The non-conductive layer covers the majority of the anti-corrosion layer except in the connection zone. The connection zone is covered by a removable liner (8).

[0034] Herein after, the terms 'frame', 'framing structure', 'conductive frame' and are interchangeably. By conductive, it is herein understood as 'electrically conductive'. The term 'majority' is intended to mean almost the entire surface area, preferably the entire surface area. However, it cannot be excluded that some insignificant part(s) of the surface are not covered. The term 'insignificant' would mean having no substantial impact on the dedicated performance.

[0035] By 'frame' or 'framing structure', it is herein commonly understood any kind of frames for openable windows such as casement windows, tilting windows, sliding windows and glass doors as well as non-openable windows. The conductive frame of the present invention will support a glazing and therefore comprises a rebate zone configured to receive the glazing. The rebate zone typically runs along the entire perimeter of the frame. The rebate zone can be a generic 2D portion or 3D portion of the frame. The glazing contact zone is the zone within the rebate zone wherein the glazing is in contact - direct contact or indirect contact, with the frame. The glazing contact zone can have the same or different shape than the rebate zone. For example, the rebate zone can be of a cross-sectional generic U-shape and the glazing contact zone can be of the same generic cross-sectional U-shape, of the same or smaller size. In another example, the rebate zone can be of a cross- sectional general U-shape or L-shape and the glazing concert zone can be limited to one wall and / or the bottom of the cross-sectional general U-shape or L-shape. In such example, the glazing contact zone can be of smaller size that the rebate zone.

[0036] Typically, the glazing contact zone is smaller than the rebate zone. Typically the connection zone is smaller than the glazing contact zone.

[0037] According to the invention, the frame can have a cross-sectional generic L-shape as illustrated in Figure 1 or U-shape as illustrated in Figure 3. The shape of the frame can have any specific design depending on the desire application or specific needs such as assembly clips, ventilation areas, aesthetic or alike.

[0038] To maintain correctly the shielding glazing at the correct position, as illustrated in most figures, the conductive frame has typically a first lateral wall (31), optionally a second lateral wall (32) and a bottom (33) forming the generic L-shape or U-shape. The first lateral wall and the bottom usually forms a single piece while the second lateral wall is movable to insert and remove the glazing from the frame. The second lateral wall can also be called glazing bead or fixing bead.

[0039] The conductive frame has a generic shape similar to the shape of the glazing to be accommodated into the frame. That means that the frame has as many sides as the glazing has. Usually, the glazing and the frame have, in the x-y plane, a generic rectangular shape has illustrated in Figure 2. In such rectangular shape, the frame comprises four parts : a lower part, in the lowest Y values, a top part, in the highest Y values and two lateral parts. Whatever the shape of the frame, it has by definition has a perimeter and a surface area. To support the glazing, the frame has a rebate zone along its perimeter. Similarly, the rebate zone has a glazing contact zone along its perimeter.

[0040] The connection zone is the zone within the glazing contact zone wherein the shielding glazing is electrically connected to the conductive frame. This can be a direct electrical connection or an indirect electrical connection wherein there is an electrically conductive element between the shielding glazing and the conductive frame. The connection zone runs along at least along 50%, preferably at least 75%, preferably 90% and more preferably 100% of the perimeter of the glazing contact zone. The connection zone can be discontinuous in the form of dots or dashes or preferably is continuous along the perimeter of the glazing contact zone. It is preferred that the connection zone is in a continuous form such as ribbon, running along the entire perimeter of the glazing contact zone to improve the shielding performance, as illustrated in Figure 2.

[0041] The connection zone can be located on any part of the glazing contact zone. In one embodiment of the present invention wherein the conductive frame has the general cross sectional U-shape, the rebate zone has typically the same overall cross sectional U-shape and the glazing contact zone has further the same overall cross sectional U-shape. Typically, a connection zone can be located on the first lateral wall and / or on bottom wall of the frame. The glazing contact zone can further comprise another connection zone on the glazing contact zone on the second wall of the frame as illustrated in Figure 5.

[0042] According to the invention, the conductive frame is made of material that conduct electricity, typically is a metallic frame that can be made of aluminium, stainless steel and / or a coated metal structure, preferably an aluminium frame or a steel frame.

[0043] The conductive frame comprises at least 2 different layers: a conductive anti-corrosion layer and a non-conductive layer. For the sake of clarity, 'a' means herein 'at least one'. The conductive frame comprises a conductive anti-corrosion layer on the majority of its surface area. The conductive anticorrosion layer provides long lasting protection of frame by preventing the gradual deterioration by chemical or electro-chemical reaction with their environment, typically with oxidants such as oxygen, hydrogen or hydroxides. Any known suitable conductive anti-corrosion layer can be used for the present invention.

[0044] It is known that passivation occurs on aluminium based frame. When exposed to air a hard, relatively inert surface layer, usually an oxide, is formed naturally on their surface. It has been surprisingly found that the passivation layer is detrimental to the conductivity of the frame and therefore the application of the conductive anti-corrosion layer on the frame of the present invention prevents passivation and therefore maintains, if not improve electrical conductivity.

[0045] The electrically conductive frame of the present invention, further comprise a non-conductive layer that covers the anti-corrosion layer. The non-conductive layer can be any dielectric coating, is typically a paint or finish coating, that will provide the frame its final aesthetics.

[0046] The non-conductive layer covers the majority of the anti-corrosion layer except in the connection zone wherein the electrical connection between the shielding glazing and electrically conductive occurs. The connection zone is covered by a removable liner. By 'removable liner' it is meant any layer that is designed to protect the specific area of the connection zone on the frame and that is to be covered by the non-conductive layer. It can be a tape, a glue, silicone material, or any other suitable material. Preferably for cost and ease of production, the removable liner is a tape.

[0047] It has been surprisingly found that the conductive frame of the present invention provides not only all the required functions of the generic frame by being protected against corrosion and by providing all required aesthetics' flexibility required by the market but as well, is cost-effective, easy and simple to produce by conventional frame manufactures with no additional complexity, while being dedicated specifically for use in the application of electromagnetic shielding.

[0048] In an embodiment of the present invention, to improve further the electrical connection and thereby the shielding performance, an additional conductive element can be added between, the anti-corrosion layer and the removable liner, preferably a conductive gasket and / or a conductive tape, the tape being by definition an 'adhesive tape'.

[0049] The frame and therefore the corresponding glazing can have any shape in order to fit with the application, for example a windshield, a sidelite, a sunroof of an automotive, a lateral glazing of a train, a window of a building,...The electromagnetic shielding assembly

[0050] The present invention further relates to an electromagnetic shielding assembly that comprises the conductive frame of the present invention, wherein the removable liner has been removed, in combination with a shielding glazing.

[0051] The glazing have a peripheral edge to be enclosed in the rebate zone of the frame. Typically, the shielding glazing is maintained within the rebate zone of the conductive frame by setting blocks and / or gasket(s). Settings blocks are used to support, protect and adjust the placement of the glazing. Gaskets are in general continuous over the whole perimeter of the frame. The glazing is maintained inside the frame in the generic cross sectional U-shape, typically by a first gasket attached to the first lateral wall and a second gasket attached to the second lateral wall. These gaskets are well-known by the skilled person to ensure the tightness between the glazing and the frame.

[0052] In the embodiment wherein a gasket is used and is located between the connection zone of the conductive frame and the conductive film of the shielding glazing, a conductive gasket designed to ensure electrical connection, is required.

[0053] The electromagnetic shielding assembly will be in general combined with further elements such as walls, windows, ceiling, other frames, ... to form an electromagnetic shielding space. Therefore, in a preferred embodiment of the present invention, the conductive frame can have externalconnection zone. By 'external connection zone' it is herein understood a connection zone located out of the rebate zone, on the exterior surface of the conductive frame. The conductive frame can comprise indeed further external connection zone(s) to electrically connect the conductive fame of the present invention or the electromagnetic shielding assembly of the present invention, to other electromagnetic shielding elements, to form e.g. an electromagnetic shielding space.The shielding glazing

[0054] The electromagnetic shielding assembly of the present invention comprising a shielding glazing. As referred herein, a 'shielding' glazing is a glazing that comprising at least one glass pane coated with at least one conductive layer. Herein after 'glazing' and 'shielding glazing' can be used interchangeably. 'Coated' means 'coated over its whole surface'.

[0055] Preferably for use in the electromagnetic shielding of the present, to provide visual access to the space that is protected from electromagnetic waves by the assembly, the glazing has a light transmission of at least 50%, preferably at least 70%. In some cases, the light transmission can be lower than 50%. The light transmission depends on the structure and glass composition of the glazing.

[0056] The term "glass" in the present invention is understood to mean any type of mineral or organic glasses known to the skilled in the art. The mineral glasses may be soda-lime-silicate glass, aluminosilicate glass, alkali-free glass, boro-silicate glass, crystalline and polycrystalline glasses. Preferably, the mineral glass is a soda-lime-silicate glass, alumino-silicate glass or boro-silicate glass. More preferably and for reasons of lower production costs, the mineral glass is a soda-lime-silicate glass. Glass sheets of mineral glass can be obtained by the known methods such as a floating process, a drawing process, a rolling process or any other process known to manufacture a glass sheet starting from a molten glass composition; preferably a floating process for productivity and cost.

[0057] Organic glasses are typically transparent thermoplastic polymers having a Young's modulus of at least 0.5 GPa and a glass transition temperature of at least 70°C. The term "transparent" denotes a property illustrating the average LT (light transmittance) of visible light transmitted through a material in the visible spectrum of at least 1%. Preferably, transparent relates to a LT of at least 10%, more preferably a LT of at least 50%, most preferably a LT of at least 70%. Light transmittance is the percentage of incident light flux, illuminant D65 / 2°, transmitted by the material. The glass transition temperature is a well-known quantity that can be measured according to methods known by the skilled person such as for instance according to ISO 11357-2. The Young's modulus is preferably at least 1 GPa, more preferably at least 1.5 GPa. The Young's modulus is also a well-known quantity that can be measured according to methods known by the skilled person such as for instance according to ASTM D 638 and D 618 (Procedure A or B) in the case of polymers. The organic glasses are well-known by the skilled in the art and some non-exhaustive examples of suitable polymers comprise polystyrene, polyethylene terephthalate, polycarbonate and poly(methyl methacrylate). The most widely used as organic glasses are typically polycarbonate and poly(methyl methacrylate). Glass sheets of organic glass may be obtained by any method known by the skilled in the art.

[0058] The glass pane in the present invention may be selected from single glass sheets or laminates of at least two glass sheets assembled by a polymer interlayer. Laminates provide acoustics, safety and / or security benefits. Typically, polymer interlayers suitable to laminate mineral glass sheets comprise a thermoplastic material selected from the group consisting of ethylene vinyl acetate copolymer and polyvinyl butyral, more preferably polyvinyl butyral. Typical thicknesses for polymer interlayers are 0.3 mm to 3.5 mm, preferably 0.75 mm to 1.75 mm. Traditional, commercially available polymer interlayers are polyvinyl butyral (PVB) layers of 0.38 mm and 0.76mm, 1.52 mm, 2.28 mm and 3.04mm. To achieve the desired thickness, one or more of those films can be used.

[0059] The shielding glazing of the present invention can further comprise at least two glass panes separated by a spacer allowing to create a space filled by a gas like Argon to improve the thermal isolation of the window, creating an insulating window. In some embodiments, the first dielectric panel comprises at least two glass sheets separated by spacers allowing to create a vacuum space to improve the thermal isolation of the window, creating a vacuum insulating glazing (VIG).

[0060] The glazing can be flat or curved according to requirements by known methods such as hot or cold bending. The glazing can be processed, i.e. annealed, tempered,... to respect with the specifications of security and anti-thief requirements. The glass pane can be a clear glass or a colored glass, tinted with a specific composition of the glass or by applying an additional coating or a plastic layer for example. The glazing can be formed in a rectangular shape in a plan view by using a known cutting method. As a method of cutting the glazing, for example, a method in which laser light is irradiated on the surface of the glazing to cut the irradiated region of the laser light on the surface of the glazing to cut the glazing, or a method in which a cutter wheel is mechanically cutting can be used.

[0061] The shielding glazing comprises at least one glass sheet coated with at least a first conductive film. In the sense of the present invention, 'conductive' means 'electrically conductive'. Preferably, the conductivity is performed with a metallic layer with a conductivity greater than 10A5 S / m,preferably a conductivity greater than 10A6 S / m, and more preferably with a conductivity greater than 10A7 S / m. The conductive film is disposed on the majority of the surface of the glazing.

[0062] The first conductive film of the shielding glazing is electrically connected to the conductive frame via the connection zone. Such electrical connection can be achieved directly or via a conductive element.

[0063] In a first embodiment, the conductive film can be a coating system. The coating system can be made of layers of different materials and at least one of this layer is electrically conductive. The coating system is electrically conductive over the majority of one major surface of the dielectric panel, in the x-y plane. Preferably, the coating system is placed on the majority of one surface of the glazing unit and more preferably on the whole usable surface of the glazing panel, in the x-y plane.

[0064] The coating system of the present invention has typically an emissivity of not more than 0.4, preferably less than 0.2, in particular less than 0.1, less than 0.05 or even less than 0.04. The coating system of the present invention may comprise a metal based low emissive coating system; these coatings typically are a system of thin layers comprising one or more, for example two, three or four, functional layers based on an infrared radiation reflecting material and at least two dielectric coatings, wherein each functional layer is surrounded by dielectric coatings. The coating system of the present invention may in particular have an emissivity of at least 0.010. The functional layers are generally layers of silver with a thickness of some nanometres, mostly about 5 to 20nm. Concerning the dielectric layers, they are transparent and traditionally each dielectric layer is made from one or more layers of metal oxides and / or nitrides. These different layers are deposited, for example, by means of vacuum deposition techniques such as magnetic field-assisted cathodic sputtering, more commonly referred to as "magnetron sputtering", or Chemical deposition such as CVD or PECVD or any other known deposition method. In addition to the dielectric layers, each functional layer may be protected by barrier layers or improved by deposition on a wetting layer.

[0065] In some embodiments, the coating system can be a hard coating system such as CVD, PECVD. In some other embodiments, the coating system can be a soft coating system such as PVD.

[0066] The coating system can be a conductive laminated film obtained by sequentially laminating a transparent dielectric, a metal film, and a transparent dielectric, ITO, fluorine-added tin oxide (FTO), or the like can be used. As the metal film, for example, a film containing as a main component at least one selected from the group consisting of Ag, Au, Cu, and Al can be used.

[0067] In another embodiment, the conductive layer can be a metallic meshed structure. The metallic meshed structure can be a woven metallic mesh. Preferably, the meshed structure is a metal. In some preferred embodiments, the meshed structure can be disposed on a plastic film.

[0068] According to some embodiments of the present invention, the shielding glazing can further comprise a second conductive film. The second conductive film is disposed on another surface of the glazing. The first and the second conductive films can have the same or different composition depending on the desire application.

[0069] The shielding glazing of the present invention can further comprise a conductive element. The glazing has edges and a perimeter. The conductive element is connected to the conductive layer, preferably all around the perimeter of the conductive layer to avoid leakage of electromagnetic waves. According to the invention, the conductive element comprises an exceeding element part that extends outside of the edges of the glazing such that the exceeding element part protrudes out of the glazing all around its perimeter. It is understood that the exceeding element part is conductive. The conductive film of the shielding glazing is then electrically connected to the conductive frame through the conductive element.

[0070] In the embodiments wherein the shielding glazing comprise at least a second conductive film. Such second conductive film can be connected directly to the connection zone of the frame or via a conductive element or via the exceeding part of the conductive element. Such exceeding element part can be the same or different than the exceeding element part - if present, of the first conductive film. Preferably, the connection of the second conductive film is performed all-around the edges of the second conductive film.

[0071] The conductive element can be made of the same material than the conductive film. Preferably, the conductive element can comprises a metal-based material.

[0072] In some embodiments, the conductive film and the conductive element can be made of a single piece. In embodiments where the first conductive layer is a metallic meshed structure, the metallic meshed structure can be first conductive film and the conductive element meaning that the metallic meshed structure extends outside of the lateral edges of the glazing.

[0073] In some embodiments, the conductive element comprises a conductive strip. The conductive strip can be single-sided or double-sided and is preferably a single-sided conductive strip. The conductive strip can comprises Cu or Al or Ni or alike. Said conductive strip can be folded back on at least a partof a surface of the glazing. It is understood that the surface is one of the external surface of the glazing, i.e. facing outside of the glazing.

[0074] To improve further the shielding performance, the electromagnetic shielding assembly of the present invention can further comprises a conductive gasket as the conductive element or as an additional conductive element, preferably a continuous gasket over the whole perimeter of frame. The conductive gasket can electrically connect the conductive film of the shielding glazing to the connection zone of the conductive frame and / or the conductive gasket can electrically connect the exceeding element part of the first conductive element of the glazing to connection zone of the conductive frame. Preferably, the electrical connection is performed over the whole perimeter of the glazing to avoid any leakage of electromagnetic waves. In the embodiments wherein the glazing comprises a second conductive layer, it can also be electrically connected to the conductive gasket.Methods and Use

[0075] The present invention further relates to a method of manufacturing the electrically conductive frame according to the first aspect of the present invention. On the conductive frame, the following optional and required process steps can be performed:

[0076] The method of the present invention can optionally comprise a first cleaning step (Optional step (b)). The cleaning step aims at removing contaminants such as rust, dirt, grease and mill scale. The cleaning step can be performed via several different methods such as mechanical cleaning using tools like wire brushes, grinders, sanders and / or via sandblasting or shot blasting to remove surface imperfections and achieve a clean surface; as chemical cleaning such as using solvents or chemical cleaners to dissolve grease and contaminants.

[0077] The first essential step of the method of the present invention (Step (c)) is the application of a conductive anti-corrosion layer on the majority of surface area of the conductive frame. Exemplary methods to provide the conductive frame with a good corrosion resistance, can be: Any anticorrosion paint or coating application, Metallization (Thermal Spraying of Zinc or Aluminium) involves spraying molten zinc or aluminium onto the surface area of the frame. It creates a protective layer similar to hot-dip galvanization but without the need for immersion in a zinc bath and / or Electrostatic powder deposition with carbon or graphite based powders.

[0078] Additional exemplary methods to provide the conductive anti-corrosion layer to frames - when made of steel material, are: Hot-dip Galvanization that involves dipping the frame into a bath of molten zinc at around 450°C. The zinc forms a protective layer on the steel frame, preventingoxidation. Electro-galvanizing, or electrolytic zinc plating, is a process in which a thin layer of zinc is applied to the frame by electrolysis. This treatment involves immersing the frame in an electrolytic solution containing zinc ions and then applying an electric current to deposit a thin zinc layer onto the surface of the steel. Phosphating is a chemical process that involves immersing the frame in a solution containing metal phosphates (such as zinc, iron, or manganese). This treatment creates a thin crystalline layer on the surface of the frame, which serves as corrosion protection and in addition provides a good base for paint or other coatings to adhere to.

[0079] A further optional step of the process of the present invention (Optional step (d ) ) is the application of a primer (also referred to as base coat). The primer is typically a chemical product that temporarily protects the frame from corrosion before the next processing step, in general before the final treatment is applied. The primer also serves as an adhesion layer between the frame and the paint or coating to come. When used in the process of the present invention before step (e), it is required that the primer is indeed conductive. Typically, conductive primers are based on metals (Silver, Copper, Nickel) or on Graphite or Carbon. When used in the process of the present invention between step (e) and step (f), then, the primer to be used can be conductive or any known non- conductive primer known in the art.

[0080] The second required step of the process of the present invention (step (e)) is the deposition of a removable liner on the connection zone(s).

[0081] The third required step of the process of the present invention (Step (f ) ) is the application of a non- conductive layer to give the conductive frame of the present invention, its aesthetic finish. Typical non-conductive layers are : polyurethane paint being often applied as a finishing layer over an epoxy primer. Polyurethane is more flexible than epoxy and provides better UV resistance. Powder coating (or thermosetting paint) involving spraying a thermosetting resin powder onto the frame and then heating it to melt and cure the powder, forming a protective and aesthetic coating.

[0082] Finally the process of the present invention can further comprise the optional step of removing the removable liner (step (g)). It is preferred that such step is not achieved before the glazing is placed into the frame to fully provide the anti-corrosion benefit of the conductive frame of the present invention.

[0083] Hence, the method of manufacturing a conductive frame of the present invention, comprises the steps of in the following order. However, when present, step d) can be performed before or after step e).a) providing a framing structure having a surface area and a rebate zone configured to receive a glazing; wherein the rebate zone comprises a glazing contact zone and wherein the glazing contact zone comprises a connection zone; the framing structure is conductive; b) optionally cleaning the framing structure; c) applying a conductive anti-corrosive layer on the majority of the surface area of the framing structure; d) optionally, applying a primer on the majority of the surface area of the framing structure; e) applying a removable liner on the connection zone; f) applying a non-conductive layer on the majority of the surface area of the framing structure; g) optionally, removing said removable liner.

[0084] Optional Step d) when performed after step e) is the application of the primer on the majority of the surface area of the conductive frame over the anti-corrosion layer but as well over the removable liner. Step f) is the application of the non-conductive layer on the majority of the surface area of the conductive frame over the anti-corrosion layer but as well over the removable liner.

[0085] The method of the present invention is a simple, easy and cost-effective method to manufacture ready-to-use conductive frame for use in electromagnetic shielded assembly. The manufacturing process does not require any additional complex steps, can be performed on regular manufacturing equipment, while offering still the required anti-corrosion and aesthetic properties.

[0086] The present invention also relates to an assembling method to assemble an electromagnetic shielding assembly combining the conductive frame with a shielding glazing.

[0087] The assembling method comprises following steps, typically in the following order: i. providing a conductive frame having and a rebate zone configured to receive a glazing; wherein the rebate zone comprises a glazing contact zone and wherein the glazing contact zone comprises a connection zone; as manufactured by the above described method; ii. removing the removable liner; ill. providing a glazing comprising at least a conductive film,iv. installing the glazing in the rebate zone to connect the glazing to the glazing contact zone of the frame and to electrically connect the conductive film of the glazing to the connection zone of the conductive frame.

[0088] In the above process, the electrical connection of step iv) between the conductive film of the glazing and the connection zone, can be achieved via a conductive element, if present.

[0089] In the above process, steps ii) and ill) can be performed in any order. The above process can further comprise an additional step of providing gaskets to maintain the shielding glazing into the conductive frame. The above process can also comprise an additional step of providing conductive gaskets between the connection zone and the conductive film of the glazing or the exceeding element part of the conductive elements, if present.

[0090] The present invention finally relates to the use of an electromagnetic shielding assembly as described above for its insertion in a partition to provide an electromagnetic shielded space. The space can be the space of a stationary object, preferably a room, or of a mobile object.

[0091] The present invention permits in its different aspects to electromagnetically protect a space from electromagnetic transparency. Electromagnetic transparency can cause interference with electronic devices, such as Wi-Fi and mobile phones. It can also allow for the penetration of harmful electromagnetic radiation from external sources, such as radio and microwave frequencies. This can pose health risks to individuals within the volume and can also affect the proper functioning of medical equipment. Additionally, electromagnetic transparency can compromise the security of sensitive information by allowing for eavesdropping through electromagnetic radiation.

[0092] The present invention further permits increase the privacy inside the space. This results in increased privacy, as the present invention, especially the electromagnetic shielding system, acts as a barrier to prevent the interception of sensitive information. This advantage is particularly useful in situations where confidential information is being transmitted, such as in a corporate or government setting.

[0093] The present invention further permits to the electromagnetic shielding system's ability to block electromagnetic radiation provides an additional layer of security. This can prevent outsiders from detecting the presence of electronic devices, such as cameras or recording devices, and can also prevent eavesdropping on conversations that are taking place within the building. This advantage is particularly valuable in settings where security is a top priority, such as government buildings, embassies, and research facilities.

[0094] On top of that, when the conductive film is a coating system, the electromagnetic shielding system reflects electromagnetic waves back into the room, reducing the amount of energy lost through windows. This results in better energy efficiency, as the interior temperature is more stable and less energy is required to maintain it. This advantage can result in significant cost savings over time, particularly in volumes with large numbers of windows.

[0095] The present invention further permits thanks to the glazing permits to retrieve energy from the sun and illuminate the volume.

[0096] The following description relates to building applications, but it's understood that the invention may be applicable to others fields like automotive or transportation applications.Detailed description of the Figures

[0097] Figure 1 is a schematic cross sectional view of one embodiment of the conductive frame (3) of the present invention in a typical L-shape, having a first lateral wall (31) and a bottom (33). The conductive frame comprises a rebate zone (3a) configured to receive a shielding glazing (not shown). The rebate zone comprises a glazing contact zone (3b) and the glazing contact zone comprises a connection zone (3c). The conductive frame comprises an anti-corrosion layer (Lcor) on the majority of its surface area and a non-conductive layer (Lnc) covering the anti-corrosion layer except in the connection zone. The connection zone is covered by a removable liner (8).

[0098] Figure 2 is a schematic top view of the first wall (31) of one embodiment of the conductive frame (3) wherein the connection zone (3c) is in a continuous form such as ribbon, running along the entire perimeter of the glazing contact zone, to improve the shielding performance.

[0099] Figure 3 is a schematic cross sectional view of one embodiment of a conductive frame (3) of the present invention in a typical U-shape, having a first lateral wall (31) , a second lateral wall (32) and a bottom (33). The conductive frame comprises a rebate zone (3a) configured to receive a shielding glazing (not shown). The rebate zone comprises a glazing contact zone (3b) and the glazing contact zone comprises a connection zone (3c). The conductive frame comprises an anti-corrosion layer (Lcor) on the majority of its surface area and a non-conductive layer (Lnc) covering the anticorrosion layer except in the connection zone. The connection zone is covered by a conductive tape (9) that is further covered by the removable liner (8). The conductive frame of Figure 3 further comprises an external connection zone (3cext) for potential connection to other electromagnetic shielding elements.

[0100] Figure 4 is a schematic cross sectional view of one embodiment of an electromagnetic shielding assembly (1) of the present invention comprising a conductive frame (3) in a typical L-shape, having a first lateral wall (31) and a bottom (33), a shielding glazing (2) and a setting block (4) to support and fix the shielding glazing into the conductive frame. The glazing contact zone (3b) comprises a connection zone (3c). The conductive frame comprises an anti-corrosion layer (Lcor) on the majority of its surface area and a non-conductive layer (Lnc) covering the anti-corrosion layer except in the connection zone. The connection zone is covered by a conductive tape (9) and the removable liner (not shown) covering the connection zone, has been removed. The shielding glazing comprising a single glass sheet that comprises a coating system as the conductive film (6). The conductive film (6) of the shielding glazing (2) is electrically connected to the conductive frame (3) via the conductive tape (9).

[0101] Figure 5 represents another embodiment of an electromagnetic shielding assembly (1) of the present invention that is similar to the embodiment of Figure 4 with the following specific features: the conductive frame (3) has a cross sectional U-shape with a second lateral wall (32) that creates a rebate zone. In this embodiment, the rebate zone comprises a first glazing contact zone and a first connection zone (Not highlighted on the figure) on the first wall (31). The rebate zone further comprises a second glazing contact zone and a second connection zone (Not highlighted on the figure) on the second wall (32). The rebate zone receives the shielding glazing (2) that is supported on the bottom (33) part of the conductive frame by a setting block (4). The shielding glazing is a single glass sheet that comprises two conductive films (6, 6b) being coating systems on each face of the glass sheet. The shielding glazing is further fixed into the conductive frame by two conductive gaskets (5c) located between each connection zone (not shown) and conductive film respectively, on the first and second walls (31, 32) of the conductive frame. The conductive gaskets (4c) provide the electrical connection between the conductive films (6, 6b) and the conductive frame (3). The electromagnetic shielding assembly (1) further comprises an external connection zone (not shown) covered by a removable liner (8) for potential connection to other electromagnetic shielding elements.

[0102] Figure 6 represents another embodiment of an electromagnetic shielding assembly (1) of the present invention that is similar to the embodiment of Figure 4 with the following specific features: the shielding glazing (2) is a laminated glazing comprising a first and second glass sheets (21, 22) connected by a polymer interlayer (24). The conductive film (6) is comprised within the polymer interlayer (24) and is in the formed of a metallic mesh that further comprises an exceeding part (51) that runs along the bottom of the first glass sheet (21) up to the connection zone (Not shown). Theexceeding part achieves the electrical connection between the conductive film and the conductive frame (3). The shielding glazing (2) is supported and fixed into the conductive frame (3) by a gasket (4b) and a setting block (4).

[0103] Figure 7 represents another embodiment of an electromagnetic shielding assembly (1) of the present invention that is similar to the embodiment of Figure 6 with the following specific features: the conductive frame (3) has a cross sectional U-shape with a second lateral wall (32) that creates a rebate zone. In this embodiment, the rebate zone comprises a first glazing contact zone and a first connection zone (Not highlighted on the figure) on the first wall (31). The rebate zone further comprises a second glazing contact zone and a second connection zone (Not highlighted on the figure) and the second wall (32). The rebate zone receives the shielding glazing (2) that is fixed on each lateral walls (31, 32) of the conductive frame by conductive gaskets (4c) and on the bottom (33) by a setting block (4). A first conductive film (6) is comprised within the polymer interlayer (24) and is in the formed of a metallic mesh that form an exceeding part of a conductive element (51) that runs along the bottom of the first glass sheet (21). A second conductive film (6b) is a coating system provided on the face of the second glass sheet (22) facing the second lateral wall (32). A conductive gasket (4c) provides the electrical connection between the second conductive film (6b) to the second wall (32) of the conductive frame (3). The electromagnetic shielding assembly further comprising a conductive strip (7) is folded back on at least one surface of the glazing in a U-shape, that runs along the bottom of the shielding glazing including the first and second glass sheets and the polymer interlayer (21, 22, 24), to achieve the electrical connection between the exceeding part of the conductive element (51) and the connection zone (Not shown) of the conductive frame (3).

[0104] Figure 8 represents another embodiment of an electromagnetic shielding assembly (1) of the present invention that is similar to the embodiment of Figure 7 with the following specific features: the conductive frame (3) has a cross sectional U-shape with a second lateral wall (32) that creates a rebate zone. In this embodiment, the rebate zone comprises a single glazing contact zone and a single connection zone (Not highlighted on the figure) located on the first wall (31) of the conductive frame. The rebate zone receives the shielding glazing (2) that is fixed on the first lateral wall (31) of the conductive frame by conductive gasket (4c), on the second lateral wall (32) of the conductive frame by regular gasket (4b) and on the bottom (33) by a setting block (4). A conductive film (6) is comprised within the polymer interlayer (24) and is in the formed of a metallic mesh that form an exceeding part of a conductive element (51) that runs along the bottom of the first glass sheet (21). The electromagnetic shielding assembly further comprising a conductive strip (7) folded back on at least one surface of the glazing, in a U-shape, that runs along the bottom of the shieldingglazing including the bottom of the first and second glass sheets and the polymer interlayer (21, 22, 24), to achieve the electrical connection between the exceeding part of the conductive element (51) and the connection zone (Not shown) of the conductive frame (3). The conductive frame of Figure 3 further comprises an external connection zone (not shown) covered by a removable liner (8) for potential connection to other electromagnetic shielding elements.

[0105] Encompassed in the present invention are conductive frames (3) comprising a single first lateral wall (31), or a first lateral wall and a bottom (33) or a first and second lateral walls (31, 32) and a bottom (33), all configurations forming a rebate zone (3a). The rebate zone can comprise one or more glazing contact zone(s) (3b) that can be located respectively on the first, second lateral walls (31,32) and / or the bottom (33). The glazing contact zone can each comprise one or more connection zone(s) (3c). The connection zone is covered by a removable liner (8). The shielding glazing (2) can be a single glass sheet (21) or a laminated glazing comprising one or more glass sheets (21, 22) each separated by a polymer interlayer (24). The shielding glazing can comprise one or more conductive film(s) (6, 6b) that can be a coating system on the face of a glass sheet, a metallic mesh structure or a combination thereof. The electrical connection between the connection zone(s) (3c) and the shielding glazing (2) can be achieved directly, or via a conductive element such as a conductive tape (9) and / or conductive gasket (4c) and / or a conductive strip (7) and / or via the exceeding part of the conductive film (51). The conductive frame (3) can further comprise one or more external connection zone(s) (3cext) that are preferably covered by removable liners (8). All these different technical features and their different combinations form part of the present invention.

[0106] Definitions

[0107] It is noted that the invention relates to all possible combinations of features recited in the claims or in the described embodiments.

[0108] In this document to a specific embodiment and include various changes, equivalents, and / or replacements of a corresponding embodiment. The same reference numbers are used throughout the drawings to refer to the same or like parts.

[0109] As used herein, spatial or directional terms, such as "inner", "outer", "above", "below", "top", "bottom", and the like, relate to the invention as it is shown in the drawing figures. However, it is to be understood that the invention can assume various alternative orientations and, accordingly, such terms are not to be considered as limiting. Further, all numbers expressing dimensions, physical characteristics, processing parameters, quantities of ingredients, reaction conditions, and the like, used in the specification and claims are to be understood as being modified in all instances by the term "about". Accordingly, unless indicated to the contrary, the numerical values set forth in the following specification and claims are approximations that can vary depending upon the desired properties sought to be obtained by the present invention.

[0110] In the following description, unless otherwise specified, expression "substantially" mean to within 10%, preferably to within 5%.

[0111] Moreover, all ranges disclosed herein are to be understood to be inclusive of the beginning and ending range values and to encompass any and all subranges subsumed therein. For example, a stated range of "1 to 10" should be considered to include any and all subranges between (and inclusive of) the minimum value of 1 and the maximum value of 10; that is, all subranges beginning with a minimum value of 1 or more, e.g. 1 to 6.1, and ending with a maximum value of 10 or less, e.g., 5.5 to 10. Further, as used herein, the terms "deposited over" or "provided over" mean deposited or provided on but not necessarily in surface contact with. For example, a coating "deposited over" a substrate does not preclude the presence of one or more other coating films of the same or different composition located between the deposited coating and the substrate.

[0112] Where the term "comprising" is used in the present description and claims, it does not exclude other elements or steps. Where an indefinite or definite article is used when referring to a singular noun e.g. "a" or "an", "the", this includes a plural of that noun unless something else is specifically stated and is to be understood as "At least one". In this document, "configured to (or set to)" may be interchangeably used in hardware and software with, for example, "appropriate to", "having a capability to", "changed to", "made to", "capable of", or "designed to" according to a situation. In any situation, an expression "device configured to do" may mean that the device "can do" together with another device or component.

[0113] Furthermore, the terms first, second and the like in the description and in the claims, are used for distinguishing between similar elements and not necessarily for describing a sequence, either temporally, spatially, in ranking or in any other manner. It is to be understood that the terms so used are interchangeable under appropriate circumstances and that the embodiments of the invention described herein are capable of operation in other sequences than described or illustrated herein. When it is described that a constituent element (e.g., a first constituent element) is "(functionally or communicatively) coupled to" or is "connected to" another constituent element (e.g., a second constituent element), it should be understood that the constituent element may be directly connected to the another constituent element or may be connected to the another constituent element through another constituent element (e.g., a third constituent element).

Claims

CLAIMS1. A conductive frame (3), having a surface area and a rebate zone (3a) configured to receive a shielding glazing (2); wherein the rebate zone comprises a glazing contact zone (3b) and wherein the glazing contact zone comprises a connection zone (3c); and comprising (i) a conductive anti-corrosion layer (Lcor) on the majority of the surface area and (ii) a non-conductive layer (Lnc); characterized in that, the non-conductive layer covers the conductive anti-corrosion layer except in the connection zone; and in that the connection zone is covered by a removable liner (8).

2. A conductive frame according to claim 1 further comprises a conductive element, preferably a conductive tape (9), located between the conductive anti-corrosion layer and the removable liner.

3. A conductive frame according to any one of the preceding claims wherein the frame is a metallic frame, preferably an aluminium frame or a steel frame.

4. A conductive frame according to any one of the preceding claims, wherein the conductive anticorrosion layer is a zinc- and / or aluminium-based layer.

5. An electromagnetic shielding assembly, comprising the conductive frame according to any one of preceding claims, wherein the removable liner has been removed; and a glazing comprising a glass pane comprising a conductive film (6) and wherein the conductive film is electrically connected to the conductive frame.

6. An electromagnetic shielding assembly according to claim 5 wherein the conductive film is a coating system.

7. An electromagnetic shielding assembly according to claim 5, wherein the conductive film is a metallic meshed structure, preferably the meshed structure is a woven metallic mesh, more preferably the meshed structure is a metal.

8. An electromagnetic shielding assembly according to any one preceding claims 5 to 7, wherein the glazing further comprises a conductive element connected to the conductive film.

9. An electromagnetic shielding assembly according to claims 8, wherein the conductive film and the conductive element are made of a single piece.

10. An electromagnetic shielding assembly according to any one of the preceding claims 8 to 9, wherein the conductive element comprises a conductive strip (7), preferably a single-sided conductive tape.

11. An electromagnetic shielding assembly according to claim 10, wherein the conductive strip is folded back on at least one surface of the glazing.

12. An electromagnetic shielding assembly according to any one of the preceding claims 5 to 11 further comprising a conductive gasket (4c) between the conductive film of the glazing and the connection zone of the conductive frame.

13. An electromagnetic shielding assembly according to any one preceding claims 5 to 12, wherein the glazing further comprises a second conductive film (6b).

14. A method of manufacturing a conductive frame according to any of the preceding claims 1 to 4, comprising the steps of : a. providing a framing structure having a surface area and a rebate zone configured to receive a glazing; wherein the rebate zone comprises a glazing contact zone and wherein the glazing contact zone comprises a connection zone; the framing structure being conductive; b. optionally, cleaning the surface of the framing structure; c. applying a conductive anti-corrosive layer on the majority of the surface area of the framing structure; d. optionally, applying a primer on the majority of the surface area of the framing structure; e. applying a removable liner on the connection zone; f. applying a non-conductive layer on the majority of surface area of the framing structure; g. optionally, removing said removable liner.

15. An assembling method to assemble the electromagnetic shielding assembly according to any one of the preceding claims 5 to 13; comprising the steps of:i. providing a conductive frame having and a rebate zone configured to receive a glazing; wherein the rebate zone comprises a glazing contact zone and wherein the glazing contact zone comprises a connection zone; as manufactured by the method of claim14; ii. removing the removable liner; ill. providing a glazing comprising a conductive film, iv. installing the glazing in the rebate zone to connect the glazing to the glazing contact zone of the frame and to electrically connect the conductive film of the glazing to the connection zone of the frame.

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