Composite pane for a vehicle

Abstract

The invention relates to a composite pane (1) for a vehicle, comprising an electrically conductive coating (4), a functional element (5), and connection means (6), wherein the functional element (5) is designed to perform a function and to emit electromagnetic radiation when an electrical voltage is applied to the functional element (5), wherein the coating (4) and the connection means (6) are electrically connected to one another, wherein the connection means (6) are designed to be electrically connected to a vehicle body (7), wherein the coating (4; 8) is electrically insulated from the functional element (5).

Description

[0001] SAINT-GOBAIN SEKURIT FRANCE 2024302-WO-PCT

[0002] 1

[0003] Composite windscreen for a vehicle

[0004] The present invention relates to a composite disc for a vehicle according to the preamble of claim 1.

[0005] Composite disks with an electrically conductive coating are known in the prior art. US Patent 2013 / 141289 A1 discloses a composite disk with a conductive coating that covers at least a portion of the substrate surface and serves, at least in that portion, as a planar antenna for receiving electromagnetic waves. A first coupling electrode is electrically coupled to the conductive coating and extracts useful signals from the planar antenna. An interference source is arranged such that interference signals can be received by the planar antenna. A second coupling electrode is electrically coupled to the conductive coating and couples interference signals received by the planar antenna out of the planar antenna. The second coupling electrode comprises a first coupling surface, and the conductive structure comprises a second coupling surface that is capacitively coupled to the first coupling surface.The two coupling surfaces are configured to selectively allow the passage of a frequency range corresponding to the interference signals to be extracted by the planar antenna.

[0006] In contrast, the present invention is based on the objective of better attenuating interference signals.

[0007] This problem is solved by a composite disc according to claim 1 and by a vehicle according to claim 13. Embodiments of the invention are specified in the dependent claims.

[0008] The laminated glass pane according to claim 1 comprises an electrically conductive coating, a functional element, and connecting means. The functional element can, for example, be a layer between an outer pane and an inner pane of the laminated glass pane. It is also possible that the functional element is a coating of the outer pane or the inner pane. Alternatively, it is also possible that the functional element is a component outside the laminated glass pane, such as a camera or a light source. SAINT-GOBAIN SEKURIT FRANCE 2024302-WO-PCT

[0009] 2

[0010] The functional element is designed to perform a function and emit electromagnetic radiation when an electrical voltage is applied to it. However, the primary focus is usually on the execution of the function. The emission of electromagnetic radiation can be a side effect, particularly an undesirable one.

[0011] According to the invention, the coating and the connecting means are electrically connected to each other, and the connecting means are designed to be electrically connected to the vehicle body. The electrical connection can, in particular, comprise galvanic coupling.

[0012] The electrical connection of the coating to the vehicle body via the connecting elements is advantageous for grounding the coating. The coating at ground potential then attenuates the electromagnetic radiation emitted by the functional element, so that the reception of other electromagnetic radiation, for example from radio transmitters, by an antenna is less or not at all disturbed by the electromagnetic radiation emitted by the functional element. The coating at ground potential is particularly advantageous for attenuating electromagnetic radiation in different frequency ranges.

[0013] The connecting elements may include, for example, busbars. They may also include a plug and / or socket through which the busbars can be connected to the vehicle body. The busbars may be located, for example, in the edge areas of the composite windscreen. The busbars may, for example, comprise or be made of copper or silver. The busbars may be soldered to the plug and / or socket. The busbars may also be printed on the vehicle body.

[0014] It is important that the coating is electrically isolated from the functional element, as the functional element must not be permanently at ground potential for proper function. For example, one or more insulating bonding layers can be arranged between the functional element and the coating. The bonding layer can be based, for example, on polyvinyl butyral (PVB), ethylene-vinyl acetate (EVA), or polyurethane (PU), or on mixtures, copolymers, or derivatives thereof, particularly preferably on SAINT-GOBAIN SEKURIT FRANCE 2024302-WO-PCT.

[0015] 3. The bonding layer is composed of PVB. This means that the bonding layer can contain the polymer in the majority of the layer (proportion greater than 50 wt%). In addition to the polymer, the bonding layer can contain other additives, such as plasticizers, UV absorbers, or stabilizers. The thickness of the bonding layer is preferably from 0.2 mm to 2 mm. For example, the bonding layer can comprise one or more PVB films with standard thicknesses of 0.38 mm or 0.76 mm.

[0016] According to one embodiment of the invention, the function can include changing an optical property of the functional element. This can be particularly advantageous, for example, to switch the composite disk between transparent and opaque depending on the applied voltage. Furthermore, it is advantageous to use a coating at ground potential in such a functional element, since such a functional element often emits electromagnetic radiation in a frequency range that is also used – at least in some countries – for radio reception.

[0017] According to one embodiment of the invention, the functional element can be opaque, cloudy, or milky without an applied electrical voltage and transparent when an electrical voltage is applied. In this case, the functional element can, for example, comprise an electrochromic material that changes its transparency to light depending on the electrical voltage. For example, the functional element can comprise liquid crystals (LC), in particular liquid crystals embedded in a polymer matrix (polymer dispersed liquid crystal, PDLC). For example, when an electrical voltage greater than or less than 0 V is applied to the functional element, the liquid crystals can be aligned in a common direction. In this state, the functional element is then transparent and / or clear.When the applied electrical voltage is 0 V, the liquid crystals can be randomly aligned, leading to scattering of the light passing through the functional element. In this case, the functional element is no longer transparent but may appear cloudy or milky, for example. Thus, the functional element can change its transparency not so much by reducing the overall transmission, but rather by increasing scattering. Such a functional element is particularly well-suited for use in the roof of a vehicle, especially a motor vehicle. If a user wants to look out through the laminated glass, the electrical voltage is set to a value greater than or equal to the SAINT-GOBAIN SEKURIT FRANCE 2024302-WO-PCT.

[0018] 4 is less than 0 V. However, if he wants to avoid glare from sunlight, the electrical voltage can be set to 0 V, thus reducing or eliminating the glare.

[0019] According to one embodiment of the invention, the composite disc can include contact elements with which an electrical voltage can be applied to the functional element. The contact elements are electrically isolated from the coating. In this embodiment, the functional element can be controlled as desired by a user without affecting the attenuation of the electromagnetic radiation emitted by the functional element. The electrical isolation of the coating from the contact elements can be achieved, for example, by the aforementioned bonding layer, which can be arranged between the coating and the contact elements.

[0020] The contacting elements can be, for example, flat electrodes that are in direct contact with the functional element.

[0021] The functional element can, for example, have a relatively large surface area. For example, the functional element can have a surface area that is more than 20%, in particular more than 50%, preferably more than 80% of the surface area of ​​the inner or outer pane of the laminated pane.

[0022] Such a large-area functional element with an electrochromic material can emit electromagnetic radiation in a frequency range that is also used – at least in some countries – for radio reception. Therefore, the use of this coating in combination with electrically connected fasteners is particularly advantageous for such a functional element.

[0023] According to one embodiment of the invention, the laminated pane can comprise an inner pane and an outer pane. The outer pane and the inner pane are preferably glass panes, particularly preferably made of soda-lime glass, as is common for window panes. However, one or both of the panes can also be made of other types of glass, for example, quartz glass, borosilicate glass, or aluminosilicate glass, or of rigid, clear plastics, for example, polycarbonate or polymethyl methacrylate. The thicknesses of the outer pane and the inner pane are preferably from 0.5 mm to 5 mm, and particularly preferably from 1 mm to 3 mm, independently of one another. The coating can be applied to more than 50%, preferably more than 80%, of the surface of the inner pane or the outer pane. Such a large-area SAINT-GOBAIN SEKURIT FRANCE 2024302-WO-PCT

[0024] 5

[0025] Coating is particularly advantageous for suppressing electromagnetic radiation when the functional element also has a large surface area.

[0026] The terms outer pane and inner pane serve only to distinguish between a first pane and a second pane. When the composite pane is used as a vehicle window, the outer pane is preferably, but not necessarily, oriented towards the exterior of the composite pane, and the inner pane towards the interior. The composite pane according to the invention can, for example, be designed as a roof pane of a vehicle.

[0027] According to one embodiment of the invention, the inner pane can have an inner surface facing away from the outer pane. The coating can be arranged on this inner surface. This is particularly advantageous if the coating also fulfills another function, such as reducing emissivity.

[0028] According to one embodiment of the invention, the coating can be designed to reduce emissivity. Emissivity-reducing coatings are also known as heat-radiation-reflecting coatings, low-emissivity coatings, or LowE (low emissivity) coatings. Emissivity is the measure that indicates how much heat radiation the pane emits into an interior space in its installed position compared to an ideal heat radiator (a black body). Emissivity-reducing coatings serve to reduce the amount of heat entering the interior space (infrared components of solar radiation and, in particular, the thermal radiation of the pane itself) and also to reduce the amount of heat emitted from the interior space. They exhibit reflective properties with respect to infrared radiation, especially heat radiation in the spectral range of 5 pm to 50 pm (see also standard DIN EN 12898:2019-06).This effectively improves thermal comfort in the interior. At high outside temperatures and with strong sunlight, the emissivity-reducing coatings can at least partially reflect the heat radiation emitted from the entire pane towards the interior. At low outside temperatures, they can reflect the heat radiation emitted from the interior, thus reducing the effect of the cold pane as a heat sink. The emissivity-reducing coating further enhances thermal comfort in the interior. It is typically a transparent stack of thin films. The emissivity-reducing coating has at least one, preferably exactly one, electrically conductive layer that provides the infrared radiation-reflecting properties. The conductive layer is SAINT-GOBAIN SEKURIT FRANCE 2024302-WO-PCT.

[0029] 6 preferably based on a transparent conductive oxide (TCO), in particular indium tin oxide (ITO), alternatively indium zinc mixed oxide (IZO), gallium-doped tin oxide (GZO), fluorine-doped tin oxide (FTO, SnO2:F), antimony-doped tin oxide (ATO, SnO2:Sb), or niobium-doped titanium oxide (TiO2:Nb). Unlike metals, TCOs are not susceptible to corrosion, so they can be used on the exposed inner surface of the inner disk. In addition to the conductive layer, the coating typically has dielectric layers (for example, based on silicon oxide or nitride), which serve in particular to optimize the optical properties (for example, light transmission) or as barrier layers to regulate oxygen diffusion during the deposition of the coating.

[0030] It is particularly advantageous to design the coating to reduce emissivity, since the coating then fulfills two functions: the suppression of the electromagnetic radiation of the functional element and the reduction of emissivity.

[0031] According to one embodiment of the invention, the coating can reflect infrared radiation, in particular with a wavelength between 5 pm and 50 pm. For the purposes of this description, this means in particular that more than 50%, preferably more than 80%, of the infrared radiation incident on the coating is reflected.

[0032] According to one embodiment of the invention, the composite disc can comprise several electrically conductive coatings. These coatings can have some or all of the features mentioned in connection with the single coating within the scope of this description. The use of several such coatings is advantageous for particularly good suppression of the electromagnetic radiation of the functional element.

[0033] According to one embodiment of the invention, the connecting means can comprise current collectors. The coating can be soldered to the current collectors. The current collectors can comprise or consist of copper or silver. The current collectors can, in particular, be printed. The current collectors can be arranged in the entire edge region of the composite disc or in parts of the edge region. For the purposes of this description, the edge region is understood to mean, in particular, a circumferential area of ​​the composite disc that forms the edge of the composite disc. SAINT-GOBAIN SEKURIT FRANCE 2024302-WO-PCT

[0034] 7

[0035] According to one embodiment of the invention, the connecting means can comprise a plug and / or a socket. The current collectors can, for example, be soldered to the plug and / or the socket.

[0036] According to one embodiment of the invention, the functional element can be configured to heat at least a portion of the composite disk, emit light, or transmit image data when an electrical voltage is applied. For example, the functional element can comprise an LED or a camera.

[0037] The vehicle according to claim 13 comprises a composite disc according to one embodiment of the invention. The vehicle can, in particular, be a motor vehicle.

[0038] According to one embodiment of the invention, the coating can be electrically connected to the vehicle body via the connecting means.

[0039] It is also possible that the vehicle includes an antenna designed to receive the electromagnetic radiation emitted by the functional element.

[0040] Further features and advantages of the present invention will become clear with reference to the following description of preferred embodiments and the accompanying figures. The same reference numerals are used for identical or similar components, features, or elements, and for components, features, or elements with identical or similar functions.

[0041] Fig. 1 is a schematic sectional view of a composite disc according to one embodiment of the invention; and

[0042] Fig. 2 shows a schematic perspective view of a composite disc according to one embodiment of the invention.

[0043] The composite disk 1 comprises an outer disk 2 and an inner disk 3. The outer disk 2 and the inner disk 3 are connected to each other via dielectric bonding layers 9.

[0044] The bonding layers 9 can, for example, be based on polyvinyl butyral (PVB), ethylene-vinyl acetate (EVA), or polyurethane (PU), or on mixtures, copolymers, or derivatives thereof, particularly preferably on PVB. This means that the films largely consist of the aforementioned polymer SAINT-GOBAIN SEKURIT FRANCE 2024302-WO-PCT

[0045] The bonding layer may contain 8 components (in a proportion greater than 50 wt%). In addition to the polymer, the bonding layer may contain other additives, such as plasticizers, UV absorbers, or stabilizers. The thickness of the bonding layer is preferably from 0.2 mm to 2 mm. For example, the bonding layer may comprise one or more PVB films with standard thicknesses of 0.38 mm or 0.76 mm.

[0046] Between the connecting layers 9, an electrochromic layer 5 is arranged as a functional element, which is transparent when an electrical voltage is applied to the electrochromic layer 5 and scatters incident light without an applied electrical voltage, so that it appears cloudy, milky or opaque.

[0047] An emissivity-reducing coating 4 is arranged on an inner surface of the inner pane 3 that points away from the outer pane 2. The emissivity-reducing coating 4 can, for example, comprise indium tin oxide (ITO). Preferably, the emissivity-reducing coating 4 consists of more than 90% indium tin oxide.

[0048] Furthermore, the composite pane 1 comprises a metal layer 8, which is arranged on a surface of the outer pane 2 facing the inner pane 3. The metal layer 8 is designed as an infrared radiation-reflecting coating.

[0049] It is important that both the metal layer 8 and the emissivity-reducing coating 4 are electrically isolated from the electrochromic layer 5, since the electrochromic layer 5 must not be permanently at ground potential for it to function properly.

[0050] Both the electrochromic layer 5 and the emissivity-reducing coating 4 and the metal layer 8 each have a surface area that is greater than 50%, preferably greater than 80%, of the surface area of ​​the outer pane 2 or the inner pane 3.

[0051] During operation, the electrochromic layer 5 emits electromagnetic radiation when an electrical voltage is applied to it. This electromagnetic radiation can have a frequency that can interfere with the reception of other electromagnetic radiation. For example, an antenna used for radio reception may be located near the laminated glass 1. This is particularly common when the laminated glass 1 is used in a vehicle, especially a motor vehicle such as a car or truck. The electromagnetic radiation emitted by the electrochromic layer 5 can then interfere with radio reception. SAINT-GOBAIN SEKURIT FRANCE 2024302-WO-PCT

[0052] 9

[0053] Therefore, it is advantageous to electrically connect the emissivity-reducing coating 4 and the metal layer 8 to the vehicle body 7 via connecting elements 6. From an electrical perspective, the vehicle body 7 is at ground potential. The emissivity-reducing coating 4 and the metal layer 8 are thus connected to ground potential via the connecting elements 6. Consequently, the emissivity-reducing coating 4 and the metal layer 8 attenuate the electromagnetic radiation from the electrochromic layer 5, so that radio reception is less affected or not affected at all.

[0054] As an alternative to the emissivity-reducing coating 4 and / or the metal layer 8, another electrically conductive coating can also be used, which is electrically connected to ground potential via the connecting means 6. It is also possible to connect only either the emissivity-reducing coating 4 or the metal layer 8 electrically to ground potential via the connecting means 6. The composite pane 1 can be a roof pane of the vehicle, in particular of a motor vehicle.

[0055] SAINT-GOBAIN SEKURIT FRANCE 2024302-WO-PCT

[0056] 10

[0057] Reference symbol list

[0058] 1 composite disc

[0059] 2 Outer pane

[0060] 3 Inner pane 4 Emissivity-reducing coating

[0061] 5 Electrochromic layer

[0062] 6 Fasteners

[0063] 7 Bodywork

[0064] 8 Metal layer 9 Dielectric compound layer

Claims

SAINT-GOBAIN SEKURIT FRANCE 2024302-WO-PCT 11 Patent claims 1. Composite disc (1) for a vehicle, comprising an electrically conductive coating (4; 8), a functional element (5) and connecting means (6), wherein the functional element (5) is configured to perform a function and emit electromagnetic radiation when an electrical voltage is applied to the functional element (5), wherein the coating (4; 8) and the connecting means (6) are electrically connected to each other, wherein the connecting means (6) are configured to be electrically connected to a body (7) of the vehicle, characterized in that the coating (4; 8) is electrically insulated from the functional element (5).

2. Composite disc (1) according to claim 1 , characterized in that the function comprises a change in an optical property of the functional element (5).

3. Composite disc (1) according to one of the preceding claims, characterized in that the functional element (5) is opaque without applied electrical voltage and transparent with applied electrical voltage.

4. Composite disc (1) according to one of the preceding claims, characterized in that the composite disc (1) comprises contacting elements with which the electrical voltage can be applied to the functional element (5), wherein the contacting elements are electrically insulated from the coating (4; 8).

5. Composite disc (1) according to one of the preceding claims, characterized in that the composite disc (1) comprises an inner disc (3) and an outer disc (4; 8), wherein the coating (4; 8) is arranged on more than 50%, preferably more than 80%, of a surface of the inner disc (3) or the outer disc (2).

6. Composite disc (1) according to the previous claim, characterized in that the inner disc (3) has a direction pointing away from the outer disc (2). SAINT-GOBAIN SEKURIT FRANCE 2024302-WO-PCT 12 has an inner surface, wherein the coating (4; 8) is arranged on the inner surface.

7. Composite disc (1) according to one of the preceding claims, characterized in that the coating (4; 8) is designed to reduce emissivity.

8. Composite disc (1) according to the previous claim, characterized in that the coating (4; 8) reflects infrared radiation, in particular with a wavelength between 5 pm and 50 pm.

9. Composite disc (1) according to one of the preceding claims, characterized in that the composite disc (1) comprises several electrically conductive coatings.

10. Composite disc (1) according to one of the preceding claims, characterized in that the connecting means (6) comprise current collectors, wherein the coating (4; 8) is soldered to the current collectors.

11. Composite disc (1) according to one of the preceding claims, characterized in that the connecting means (6) comprise a plug and / or a socket.

12. Composite disk (1) according to one of the preceding claims, characterized in that the functional element (5) is designed to heat at least a part of the composite disk (1), emit light or transmit image data when an electrical voltage is applied.

13. Vehicle comprising a composite disc (1) according to any of the preceding claims.

14. Vehicle according to claim 12, characterized in that the coating (4; 8) is electrically connected to a body (7) of the vehicle via the connecting means (6). SAINT-GOBAIN SEKURIT FRANCE 2024302-WO-PCT 13 15. Vehicle according to claim 12 or 13, characterized in that the composite window (1) is a roof window of the vehicle, in particular of the motor vehicle.

Images