Vehicle roof composite pane with thermal-radiation-reflecting inner-side coating and large-area communication window
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- SAINT GOBAIN SEKURIT FRANCE
- Filing Date
- 2026-01-16
- Publication Date
- 2026-07-30
Smart Images
Figure EP2026051053_30072026_PF_FP_ABST
Abstract
Description
[0001] SAINT-GOBAIN SEKURIT FRANCE 2025008-WO-PCT
[0002] 1
[0003] Vehicle roof composite window with heat-reflective inner coating and large communication window
[0004] The invention relates to a composite vehicle roof window with a heat-radiation reflective inner coating and a large-area communication window, as well as a method for its manufacture.
[0005] Many laminated glass panes with a heat-reflecting inner coating and methods for manufacturing such laminated glass panes are already known. These panes mostly feature a metallic coating, such as a silver coating, as a functional layer, for example, from EP 877006 B1, EP 1 047 644 B1, and EP 1 917 222 B1. However, such coatings are susceptible to corrosion and lack sufficient mechanical resistance. Therefore, these coatings cannot be applied to the surface of a pane facing the vehicle interior, where the coating is exposed to air and other environmental influences. WO2011 / 105991A1 discloses a pane with a heat-reflecting coating that can be applied to its interior surface. The coating comprises a functional layer of indium tin oxide alongside dielectric layers.US4507547A discloses another disk with a heat radiation reflective coating with a functional layer of indium tin oxide.
[0006] Discs with metal-containing or conductive coatings also have other disadvantages. For example, radio-frequency radiation is reflected or absorbed by many metal-containing coatings. This significantly impairs the functionality of many sensors, navigation, telecommunications, and radio devices. To solve these problems, at least partial removal of the metal-containing coating is usually necessary. In the case of electromagnetic radiation in the radio frequency range, such as FM, AM, UHF, VHF, DAB, mobile telephony in the GSM 900, GSM 1800, and UMTS bands, satellite navigation (GPS), or microwave radiation, complete or at least grid-like removal of the coating is required. The grid meshes must have a line spacing that is significantly smaller than the wavelength of the desired electromagnetic radiation.SAINT-GOBAIN SECURITY FRANCE 2025008-WO-PCT.
[0007] 2
[0008] Removing a coating from a portion of the windshield to create a communication window can be achieved primarily by masking the area not to be coated or by laser stripping, although this is time-consuming due to the relatively large area to be stripped. Another problem with stripping a large area is that the subsequent bending of the windshield during manufacturing results in very uneven heat absorption. The coated areas absorb heat more efficiently and dissipate it more quickly than the stripped areas. This leads to localized defects and irregularities in the stripped area of the windshield, particularly at the transition to the coated area, which cannot be subsequently corrected. The optical and, to some extent, the mechanical properties of the finished windshield are thus impaired.Additionally, the entire bending process slows down because constant attention must be paid to preventing excessive stress and potential cracking due to the differing temperature behavior of the various areas. This necessitates a comparatively slow temperature curve for heating, requiring corresponding monitoring and extended duration of the tempering and bending process.
[0009] On the other hand, a suitable laser can be used to remove the metal-containing coatings in the form of lines. Since only small portions of the metal-containing coating need to be removed, the infrared-reflecting effect is largely retained, while the radio-frequency communication signals are hardly attenuated and can be received and transmitted through the layer. However, the problem already described above—the risk of optical and potential mechanical deterioration due to the different heat absorption of the coated and stripped areas during the bending process—also arises here. The larger the communication window stripped by the grid lines, the more serious the adverse effects become.These disadvantages are less pronounced with relatively small communication windows in windshields, whereas with vehicle roof windows, which have significantly larger areas, these disadvantages are much more significant and lead to a much higher rejection rate. SAINT-GOBAIN SEKURIT FRANCE 2025008-WO-PCT.
[0010] 3
[0011] An example of a windshield with a grid-like coating for a communication window in a metal-containing coating is described in international patent application WO 2014 / 135296 A1. Communication windows in windshields are usually relatively small and always located outside the driver's and front passenger's field of vision. The edges of the grid are perceived as visually distracting, and therefore a gradual transition with increasingly larger gaps in the grid lines is proposed in these areas. The document makes no mention of the temperature-specific problems associated with bending the coated glass. Nor does it address composite glass panels used in vehicle roofs.
[0012] An example of another windshield with a metal-containing coating, in particular a silver coating, is disclosed in European patent application EP 2774898 A1. Here, too, the focus is on minimizing optical distortion and unwanted reflections in a sensor window with a grid structure on the windshield. For this purpose, a grid pattern is incorporated into the metal-containing coating as a layer for the sensor window, oriented at an angle of between 30° and 60° to the optical distortion direction of the glass. The patent application makes no mention of temperature-specific problems when bending the coated glass. Nor does it address composite glass for vehicle roofs.
[0013] The object of the present invention is to provide an improved curved laminated glass panel for a vehicle roof that offers good functionality with regard to the reflection of heat radiation into the interior while simultaneously exhibiting very good transmittance for communication signals. The laminated glass panel should result in a quality that is as optically and mechanically flawless as possible with respect to the coated panel, while requiring minimal effort and resulting in a low reject rate during the manufacturing process. SAINT-GOBAIN SEKURIT FRANCE 2025008-WO-PCT
[0014] 4
[0015] The object of the present invention is achieved according to the invention by a composite disk according to independent claim 1. Preferred embodiments are described in the dependent claims.
[0016] The curved laminated glass pane according to the invention is designed as a vehicle roof pane and comprises
[0017] a. at least one pane with an outer surface I and an inner surface II,
[0018] b. a second disk with an outer surface III and an inner surface IV, which is congruently connected to the first disk (1) via a thermoplastic intermediate layer, wherein
[0019] c. a heat-radiation reflective coating is applied to the interior surface IV of the second disk, wherein the heat-radiation reflective coating comprises a transparent conductive oxide selected from the group consisting of indium tin oxide, antimony- or fluorine-doped tin oxide, aluminum-doped zinc oxide (ZnO:Al), gallium-doped zinc oxide (ZnO:Ga) or mixtures thereof, and preferably indium tin oxide, wherein
[0020] d. a grid surface consisting of intersecting, uncoated grid lines is incorporated into the coating that reflects heat radiation.
[0021] According to the invention, the grid lines of the grid surface are provided as mutually parallel, stripped lines in the flat coated second disk, the disk is then bent in such a way that the grid lines no longer run parallel, at least in sections, according to the bending.
[0022] The composite glass according to the invention comprises at least a first glass and a second glass, which are laminated together via a thermoplastic interlayer. The composite glass is a vehicle roof composite glass with three-dimensional curvature. The first glass and the second glass each have an inner and an outer surface that are substantially parallel to each other. The thermoplastic interlayer connects the inner surface of the first glass and the inner surface of the second glass in a congruent, surface-to-surface manner. SAINT-GOBAIN SEKURIT FRANCE 2025008-WO-PCT
[0023] 5
[0024] The thermoplastic interlayer is formed by one or more thermoplastic polymer films. The thermoplastic films preferably contain polyvinyl butyral (PVB), ethylene vinyl acetate (EVA), polyurethane (PU), and / or mixtures thereof and / or copolymers thereof, particularly preferably polyvinyl butyral. The films are preferably based on the aforementioned materials but may contain further components, for example, plasticizers, colorants, IR or UV absorbers, preferably in a proportion of less than 50%.
[0025] The individual polymer films, particularly the PVB films, preferably have a thickness of approximately 0.025 mm (25 pm) to 1 mm, more specifically from 25 pm to 125 pm and from 0.3 mm to 1 mm, for example 50 pm, 100 pm, 0.38 mm, or 0.76 mm. The thickness of the films can influence other properties of the laminated glass pane. For example, thicker PVB films result in improved sound insulation, especially if they contain an acoustically effective core, increased burglar resistance of the laminated glass pane, and also increased protection against ultraviolet radiation (UV protection). Further layers, particularly functional ones, can also be included within the thermoplastic interlayer.An example of such a functional layer encompassed by the thermoplastic intermediate layer is a so-called PDLC (polymer dispersed liquid crystal) layer, with which the transparency can be changed by a simple electrical command, thus creating privacy.
[0026] In an advantageous embodiment, the thermoplastic intermediate layer is formed from one or more polyvinyl butyral films.
[0027] Furthermore, the thermoplastic interlayer can be a functional interlayer, in particular an interlayer with acoustic damping properties, an interlayer tinted at least in some sections, and / or an interlayer colored at least in some sections. SAINT-GOBAIN SEKURIT FRANCE 2025008-WO-PCT
[0028] 6
[0029] The thickness of the thermoplastic interlayer is preferably from 0.2 mm to 1.0 mm. For example, thermoplastic films with a standard thickness of 0.76 mm can be used.
[0030] The first pane, the second pane, and the thermoplastic interlayer can be clear and colorless, or tinted or colored. In a preferred embodiment, the total transmission through the laminated glass is greater than 70%. The term "total transmission" refers to the procedure for testing the light transmittance of motor vehicle windows as specified in ECE-R 43, Annex 3, Section 9.1.
[0031] The laminated glass is preferably curved in one or more directions of space, as is common for motor vehicle roof windows, with typical radii of curvature ranging from about 10 cm to about 40 m.
[0032] The first disc and / or the second disc can be thermally or chemically prestressed, partially prestressed, or not prestressed.
[0033] In an advantageous embodiment of the composite glass according to the invention, used as a roof pane for a motor vehicle, the first pane is a non-stressed pane. The first pane can be subjected to stresses such as stone impacts. If a stone, especially a small, pointed stone, strikes a glass pane, it can penetrate its surface. In the case of a stressed pane, the stone can penetrate into the tensile stress zone inside the pane, causing it to shatter. A non-stressed first pane has a wide compressive stress zone and lower tensile stress inside, and is therefore less susceptible to impact from a pointed object. A non-stressed first pane is therefore very advantageous overall with regard to the safety of the vehicle occupants. SAINT-GOBAIN SEKURIT FRANCE 2025008-WO-PCT
[0034] 7
[0035] In a preferred embodiment of the invention, the first disk comprises soda-lime glass or borosilicate glass, in particular soda-lime glass. Soda-lime glass is readily available at low cost and has proven its worth in automotive applications.
[0036] The second pane can, in principle, have any chemical composition known to an expert. For example, the second pane can contain or consist of soda-lime glass or borosilicate glass.
[0037] In an advantageous embodiment of the invention, the second pane is chemically tempered. This tempering provides the second pane with exceptional fracture resistance and scratch resistance. For very thin glass panes, chemical tempering is more suitable than thermal tempering. Since thermal tempering relies on a temperature difference between a surface zone and a core zone, it requires a minimum glass pane thickness. Sufficient stresses can typically be achieved with commercially available thermal tempering devices for glass thicknesses of approximately 2.5 mm and above. For thinner glass, the generally required tempering values cannot usually be achieved (see, for example, ECE Regulation 43).In chemical tempering, the chemical composition of the glass is altered at the surface through ion exchange, whereby the ion exchange is limited to a surface zone via diffusion. Chemical tempering is therefore particularly suitable for thin panes. The terms chemical annealing, chemical hardening, or chemical strengthening are also commonly used for chemical tempering.
[0038] In the automotive sector, both the stability and impact resistance of the laminated glass, as well as the lowest possible weight of the glazing, are of paramount importance. In this regard, it has been observed that an asymmetry in the thickness of the first and second panes has a beneficial effect on the stability of the laminated glass. The thickness of the first pane is typically significantly greater than that of the second. Such a thickness asymmetry is achieved with the SAINT-GOBAIN SEKURIT FRANCE 2025008-WO-PCT
[0039] 8
[0040] The associated advantages may also be desirable in the composite disc according to the invention with a heat radiation reflective coating.
[0041] A composite pane according to the invention can additionally comprise a cover print, in particular made of a dark, preferably black, enamel. The cover print is in particular a peripheral, i.e., frame-like, cover print. The peripheral cover print primarily serves as UV protection for the adhesive used to mount the composite pane. The cover print can be opaque and cover the entire surface. The cover print can also be at least partially semi-transparent, for example, as a dot matrix, stripe matrix, or checkered matrix. Alternatively, the cover print can also have a gradient, for example, from an opaque covering to a semi-transparent covering.The cover print is usually applied to the interior surface of the first pane or to the interior surface of the second pane, wherein the cover print is preferably applied to a pane surface on which no heat-radiation reflective coating is arranged in the composite pane according to the invention.
[0042] The heat-reflecting coating can also be called a low-emissivity coating, emissivity-reducing coating, heat-radiation-reducing coating, low-E coating, or low-E layer. Its function is to reflect heat radiation, especially infrared radiation, which has a longer wavelength than the IR component of solar radiation.
[0043] The heat-radiation-reflecting coating according to the invention comprises a transparent conductive oxide (TCO) selected from the group consisting of indium tin oxide, tin oxide doped with antimony or fluorine, aluminum-doped zinc oxide (ZnO:Al), gallium-doped zinc oxide (ZnO:Ga), or mixtures thereof, and preferably indium tin oxide (ITO). This results in particularly good results with regard to the emissivity and flexibility of the coating according to the invention. It exhibits low absorption and low reflection in the visible spectral range and therefore high transmission. The functional SAINT-GOBAIN SEKURIT FRANCE 2025008-WO-PCT
[0044] 9
[0045] The coating exhibits reflective properties towards thermal radiation, particularly infrared radiation, but is largely transparent in the visible spectral range. The coating can therefore also be used on panes where a significant reduction in transmission is not desired, for example, windshields or front side windows in motor vehicles. This is a major advantage of the invention. Furthermore, the coating according to the invention is corrosion-resistant. The coating can therefore be applied to the surface of the substrate that, when the pane is installed, faces the interior of a vehicle. On this surface, the coating according to the invention particularly effectively reduces the emission of thermal radiation from the pane into the interior in summer and the radiation of heat into the external environment in winter.This results in particularly good results with regard to the emissivity and flexibility of the coating according to the invention. The refractive index of the material of the functional layer is preferably 1.7 to 2.5.
[0046] The emissivity of the disk according to the invention can be influenced by the thickness of the functional layer. The thickness of the functional layer is preferably from 20 nm to 200 nm, particularly preferably from 40 nm to 150 nm, and most preferably from 50 nm to 130 nm, for example, about 120 nm. In this range for the thickness of the functional layer, particularly advantageous values for the emissivity and a particularly advantageous ability of the functional layer to withstand a mechanical transformation such as bending or prestressing without damage are achieved.
[0047] The interior emissivity of the composite pane according to the invention is preferably less than or equal to 50%, particularly preferably from 10% to 50%, and most preferably from 10% to 35%. Interior emissivity refers to the measure that indicates how much thermal radiation the pane, in its installed position, emits into an interior space, such as a building or vehicle, compared to an ideal heat radiator (a black body). For the purposes of this invention, emissivity is understood to be the normal emissivity at 283 K according to standard EN 12898. SAINT-GOBAIN SEKURIT FRANCE 2025008-WO-PCT
[0048] 10
[0049] The functional layer can also contain other transparent, electrically conductive oxides, such as antimony- or fluorine-doped tin oxide, aluminum-doped zinc oxide (ZnO:Al), gallium-doped zinc oxide (ZnO:Ga), or mixtures thereof.
[0050] Indium tin oxide (ITO) is preferably deposited by magnetic field-assisted sputtering using an indium tin oxide target. The target preferably contains 75 wt.% to 95 wt.% indium oxide and 5 wt.% to 25 wt.% tin oxide, as well as manufacturing-related impurities. The deposition of the indium tin oxide is preferably carried out under a protective gas atmosphere, for example, argon. A small amount of oxygen can also be added to the protective gas, for example, to improve the homogeneity of the functional layer. Alternatively, the target can preferably contain at least 75 wt.% to 95 wt.% indium and 5 wt.% to 25 wt.% tin. The deposition of the indium tin oxide then preferably takes place with the addition of oxygen as a reaction gas during sputtering.
[0051] According to the invention, the heat-reflecting coating is applied to the surface of the second pane, which, when the pane is installed, is intended to face the interior of a vehicle. The heat-reflecting coating preferably extends over the entire interior-facing surface IV of the second pane. This is particularly advantageous with regard to thermal comfort in the interior. For the purposes of the invention, the surface intended to face the interior when the pane is installed is referred to as the interior-facing surface. The coating according to the invention can, particularly at high outside temperatures and in direct sunlight, at least partially reflect the heat radiation emitted by the entire pane towards the interior.At low outside temperatures, the coating according to the invention can effectively reflect the heat radiation emitted from the interior and thus reduce the effect of the cold pane as a heat sink. SAINT-GOBAIN SEKURIT FRANCE 2025008-WO-PCT.
[0052] 11
[0053] The coating according to the invention can be applied across the entire surface of the initially flat, i.e., not yet curved, second disc. However, the surface of the disc can also have uncoated areas. For example, the surface of the disc can have a circumferential uncoated edge area, which serves as a fastening and connection area.
[0054] According to the invention, a grid surface consisting of intersecting, stripped grid lines is incorporated into the coating that reflects heat radiation.
[0055] In the context of the invention, the term "grid surface" refers to an area within the coating that has a linear layer of delamination, for example, created using a laser. This linear layer of delamination forms a tile structured with a grid pattern and appears slightly brighter on the actual disk than the surrounding coating, particularly under grazing light incidence or reflection. The grid surface preferably has a rectangular shape with the delaminated areas arranged as grid lines, as described above. The spacing of the individual grid lines depends on the wavelength of the corresponding electromagnetic radiation for which increased transmission is desired.
[0056] It is known to subsequently structure metallic layers or metal-containing layer systems by mechanically or thermally removing the initially continuously deposited layer in a linear fashion, or to introduce structures by masking during the deposition process. In particular, extremely narrow lines can be generated in the layer using laser beams. According to the present invention, however, an oxide heat-reflecting layer is processed by such linear removal through the introduction of a grid surface with intersecting grid lines.
[0057] The removal of the coating and thus the application of the grid surface can alternatively or cumulatively be carried out using masking and unmasking methods. SAINT-GOBAIN SEKURIT FRANCE 2025008-WO-PCT
[0058] 12
[0059] Such a process leads to very homogeneous layers, which on the one hand creates an even clearer optical quality of the disk, and on the other hand leads to comparably fast process speeds in the current process.
[0060] A significant advantage of the present composite disc according to the invention is that the manufacturing process, compared to both surface stripping and the comparatively smaller communication windows in windshields used to date, can be carried out with minimal effort and a low reject rate. Surprisingly, it has been shown that even with larger grid areas of > 120 cm², the process can be carried out with minimal effort and a low reject rate. 2 , preferably from > 140 cm 2 and especially of > 150 cm 2, as desired for vehicle roof windows, the thermal stresses and defects which are to be feared due to the different heat absorption of the coated and uncoated areas during heating during the bending process and which would therefore require a significantly longer process time with constant monitoring, do not occur in the expected way for the composite window according to the invention with oxide heat-reflecting coating on the inner surface of the window.
[0061] The present invention is also based on the finding that a curved disc according to the invention exhibits sufficiently high transmittance for high-frequency electromagnetic radiation even with stripped line structures that are not completely parallel. In other words, the stripped layers, initially introduced as parallel grid lines, exhibit at least partially unequal—or, to put it another way, irregular—spacing from one another in the finished curved disc. This makes the composite disc according to the invention easily distinguishable from previously known discs. Furthermore, it is not necessary to strip the transparent, electrically conductive coating over a large area. Stripped structures with only a small line width are sufficient, as they do not significantly impair the optical transparency or the aesthetic appearance of the disc.The structures, which are at least partially non-parallel, can advantageously lead to the formation of fewer disruptive field-induced currents. Furthermore, this allows for high transmittance for high-frequency electromagnetic radiation (communication radiation) with very little structuring effort. At the same time, process time and costs can be kept low. This is primarily due to the fact that SAINT-GOBAIN SEKURIT FRANCE 2025008-WO-PCT.
[0062] 13
[0063] The structuring process, that is, the introduction of the stripped linear areas into the conductive coating of the initially flat disk, can be carried out with a continuous laser movement without numerous deposition points and the associated repositioning. In this way, a significantly faster structuring process time can be achieved. Similarly, with suitable preparations known to those skilled in the art, a masking method can be used for stripping, which, in terms of process time, is currently no less fast than laser stripping in production.
[0064] A further advantage of the laminated glass according to the present invention lies in the fact that a freely positionable grid surface is now provided as a communication window, thus ensuring high reliability for the vehicle occupants in the transmission of communication signals. Unlike conventional vehicle windshields with a communication window, which, due to the strict requirements for the viewing areas of a windshield, are kept comparatively small and are primarily located only in peripheral areas, the laminated glass according to the invention for a vehicle roof provides for the grid surface serving as the communication window to be freely positionable, in particular in a central or edge-adjacent area of the glass. At the same time, the functionality of the heat-reflecting coating, which contributes to good thermal comfort, remains fully intact.
[0065] In a preferred embodiment of the invention, the grid area has a size of > 120 cm². 2 , preferably from > 400 cm 2 and especially preferred by those > 500 cm 2 This distinguishes the dimensions of the grid area according to the invention from the significantly smaller communication windows in windshields, which, for example, have a size of 10 x 12 cm. Exemplary dimensions for grid areas according to the invention are 30 cm x 60 cm or 20 cm x 80 cm. This allows a significantly larger area to be provided for the sensor or communication signals, which improves the reliability of the signal transmission. This also results in a different behavior of the disc during the bending process compared to discs with a smaller grid area. SAINT-GOBAIN SEKURIT FRANCE 2025008-WO-PCT
[0066] 14
[0067] In the present embodiments of the invention, the heat-reflecting coating is applied directly to the interior surface IV of the second pane. This increases the effectiveness of heat reflection with regard to heat radiation from the interior. In contrast to metal-containing coatings, which, due to their poor mechanical and, above all, poor corrosion resistance, are only applied to an interior surface of a laminated pane, the corrosion-resistant oxide coating on the interior surface makes it possible to create a more comfortable indoor climate and also achieve energy savings of up to 20% for heating in winter and cooling in summer (compared to a surface without a heat-reflecting layer).
[0068] In a further embodiment of the composite disc according to the invention, the heat-radiation reflective coating comprises an adhesion-promoting layer and / or a cover layer.
[0069] In one embodiment of the present invention, the grid lines have a width of 40 pm to 250 pm, preferably of 70 pm to 200 pm.
[0070] In one embodiment of the invention, the distance between aligned (parallel) grid lines is from 0.3 mm to 10 mm, preferably from 0.5 mm to 5.0 mm. Such distances are technically easy to produce, for example by laser structuring. Furthermore, they hardly impair the optical transmission through the disk and allow sufficient transparency for high-frequency electromagnetic radiation, and in particular for radio and radar radiation.
[0071] In a further embodiment of the composite disc according to the invention, the maximum deviation in the spacing of the formerly parallel grid lines caused by the subsequent bending of the disc is between 100 pm and 5.00 mm, preferably between 150 pm and 2.00 mm. This deviation can be easily measured. SAINT-GOBAIN SEKURIT FRANCE 2025008-WO-PCT
[0072] 15
[0073] are determined by comparing the relevant distance between two parallel lines of a grid tile before bending and the distance between the same lines after bending.
[0074] The aforementioned maximum deviation in the spacing of the formerly parallel grid lines—that is, the linear delamination introduced as parallel grid lines into the flat disk before bending, which is caused by the subsequent bending—enables very good transparency for the communication signals. Compared to a completely delaminated surface of the same size, a composite disk with the grid surface according to the invention exhibits only an approximately 1 dB increase in signal attenuation.
[0075] In an advantageous embodiment of the composite disc according to the invention, the grid surface extends over the entire width of the second disc. Alternatively, but equally advantageously, the area of the grid surface can also be greater than 95% of the width of the disc, meaning that the grid surface spans almost the entire width of the disc. With this area, a particularly low transmission loss and a favorable distribution of the received and transmitted power behind the disc can be achieved. At the same time, a favorable ratio of improved transmission to the process costs for the coating removal can be achieved, since the potentially necessary masking of the areas not to be coated can be eliminated. In this context, the term "width of the disc" refers to the extent of the vehicle roof in its installed position perpendicular to the direction of travel.In contrast, the term "length of the disc" refers to the extension of the vehicle roof along the direction of travel.
[0076] In a further advantageous embodiment of the invention, the grid surface is arranged on the second pane such that it completely covers at least the area in which additional antennas are provided in or on the vehicle roof window. This ensures that a very large area can be used as a communication window and that the communication signals can be reliably transmitted. SAINT-GOBAIN SEKURIT FRANCE 2025008-WO-PCT
[0077] 16
[0078] Unlike the communication windows in windshields previously known in the automotive sector, the present vehicle roof composite glass allows the grid area to be positioned not only with a comparatively large surface area, but also with advantageous flexibility in terms of its placement within the glass. This enables it to be adapted, for example, to areas with one or more antennas. Despite the integration of the grid area into the flat glass and subsequent bending during manufacturing, optical or mechanical distortions of the glass are avoided. Manufacturing is simple, with a low reject rate, and can be carried out cost-effectively.
[0079] In a preferred embodiment of the present invention, the intersecting grid lines are placed parallel and orthogonal or at an angle of approximately 45° to the longitudinal edge of the flat second disk before bending.
[0080] In this way, either a visually essentially straight line pattern with predominantly rectangular or square grid lines is created, or the grid lines run at an angle to the longitudinal edge of the disc and thus to the direction of travel, giving a diamond-like appearance. This contributes significantly to greater freedom in the design of the vehicle roof. All advantageous functions are retained. Furthermore, simple and rapid manufacturing is ensured, requiring few detachment points and changes in direction during the stripping process.
[0081] In a further embodiment of the invention, the composite disc has a black printed area in the region of the grid surface.
[0082] This virtually eliminates the optical difference of the area where the grid surface is applied. The black printed area can be provided, in particular, in layers above the second disc, for example, on surface III of the second disc, as a coloring of the thermoplastic intermediate layer, or on one of the two surfaces of the first disc. It can be, for example, produced by SAINT-GOBAIN SEKURIT FRANCE 2025008-WO-PCT
[0083] 17
[0084] It may be produced by a black enamel print or by a functionally comparable black coloring.
[0085] Particularly in combination with antennas provided in the same area, this creates an invisible communication window that preferably extends across the entire width of the vehicle roof window.
[0086] The invention further comprises a method for manufacturing a curved composite disc designed as a vehicle roof disc, comprising at least the following steps:
[0087] a) Providing a first disk with an outer surface I and an inner surface II, a second disk with an outer surface III and an inner surface IV, and at least one thermoplastic intermediate layer, wherein a heat-reflecting coating is applied to the inner surface IV of the second disk, the heat-reflecting coating comprising a transparent conductive oxide selected from the group consisting of indium tin oxide, antimony- or fluorine-doped tin oxide, aluminum-doped zinc oxide (ZnO:Al), gallium-doped zinc oxide (ZnO:Ga) or mixtures thereof, and preferably indium tin oxide.
[0088] b) Introducing a grid surface consisting of intersecting, stripped grid lines into the heat-reflecting coating of the second disk, wherein the grid lines of the grid surface are introduced into the flat coated second disk as stripped lines parallel to each other,
[0089] c) Bending the first disk and bending the coated and stripped second disk, such that the grid lines no longer run parallel, at least in sections, according to the bending.
[0090] d) Forming a stacking sequence consisting of the first disk, the at least one thermoplastic intermediate layer and the second disk, such that the inner surface II of the first disk and the outer surface III of the second disk face each other and the at least one thermoplastic intermediate layer is arranged between the first disk and the second disk; SAINT-GOBAIN SEKURIT FRANCE 2025008-WO-PCT
[0091] 18
[0092] e) Joining the first pane and the second pane via the at least one thermoplastic intermediate layer to form a composite pane using a lamination process.
[0093] In other words, the inventive method provides a simple and efficient way to manufacture a vehicle roof window with a comparatively large grid area to improve the transmission of communication signals. In particular, no additional steps or complex adjustments are required with regard to the coating removal process, and the process speed is correspondingly high.
[0094] In step a), a heat-reflecting coating is applied to the inner surface IV of the second disk. The heat-reflecting coating comprises a transparent conductive oxide selected from the group consisting of indium tin oxide, antimony- or fluorine-doped tin oxide, aluminum-doped zinc oxide (ZnO:Al), gallium-doped zinc oxide (ZnO:Ga), or mixtures thereof, and preferably consists of indium tin oxide. The heat-reflecting coating is preferably applied to the inner surface IV of the inner disk and / or to the outer surface I of the outer disk by physical vapor deposition (PVD), particularly preferably by sputtering, and most preferably by magnetic field-assisted sputtering.
[0095] In step b), a grid surface consisting of intersecting, stripped grid lines is introduced into the heat-reflecting coating of the second disk. The grid lines of the grid surface are applied to the flat, coated second disk as parallel stripped lines.
[0096] It is known to those skilled in the art, in particular metallic layers or layer systems, to be subsequently removed by linear removal of the initially continuously deposited layer by mechanical or thermal means. SAINT-GOBAIN SEKURIT FRANCE 2025008-WO-PCT
[0097] 19
[0098] Structuring or introducing structures by masking during the deposition process. In particular, extremely narrow lines can be generated in the layer using laser beams. According to the present invention, however, an oxide heat-reflecting layer is processed by such linear removal through the introduction of a grid surface with intersecting grid lines.
[0099] The laser is preferably guided at a speed of 100 mm / s to 60,000 mm / s. The laser preferably has a power output of 1 W to 10 kW and / or preferably comprises a carbon dioxide, YAG, Nd:YAG, ytterbium:YAG, holmium:YAG, erbium:YAG, neodymium glass, excimer, fiber, disk, slab, or diode laser. The laser is preferably guided by a plotter.
[0100] The coated surface of the second disk can face the laser. If the disk is (largely) transparent to the laser radiation (particularly in the case of a glass disk), the coated surface can alternatively face away from the laser, and the laser radiation can be directed through the disk onto the coating. In both cases, the laser radiation is preferably focused onto the surface of the disk with the coating. The diameter of the laser spot on the coating is preferably from 25 pm to 250 pm, and particularly preferably from 40 pm to 180 pm.
[0101] Preferably, laser radiation in the UV, visible, or IR range of the electromagnetic spectrum is used. The wavelength of the laser radiation is preferably from 200 nm to 2000 nm, particularly preferably from 250 nm to 1100 nm, for example, from 355 nm to 1064 nm. This achieves particularly good results. Solid-state lasers (e.g., Nd:YAG or Yb:YAG lasers) can be used, which can be frequency-doubled, frequency-tripled, or frequency-doubled as required. Such lasers are widely used in industry, relatively inexpensive, and efficient. Alternatively, diode lasers, excimer lasers, gas lasers, or dye lasers can also be used. SAINT-GOBAIN SEKURIT FRANCE 2025008-WO-PCT
[0102] 20
[0103] The laser is preferably operated in pulsed mode. The pulse length of the laser is preferably in the femtosecond or nanosecond range. The pulse length is preferably at most 500 ns, and particularly preferably at most 300 ns. The pulse length is most preferably from 500 fs to 200 ns, and especially from 10 ps to 100 ns. This achieves particularly good results. Such short pulses minimize the thermal stress in the vicinity of the laser processing, thus enabling the processing of thin films and also heat-sensitive materials. The repetition frequency of the laser pulses is preferably from 10 kHz to 1000 kHz, and particularly preferably from 50 kHz to 400 kHz. The pulse energy is preferably from 1 mJ to 50 pJ, particularly preferably from 800 pJ to 20 pJ, and most preferably from 500 pJ to 50 pJ.
[0104] The output power of the laser is preferably from 10 W to 1000 W, preferably from 40 W to 500 W.
[0105] The laser radiation used can be adapted to the coating being treated in order to achieve effective ablation of at least the oxide coating, and optionally other layers, in the communication area to be created. This is achieved primarily by selecting the wavelength, laser power, pulse energy, and pulse duration. All of these parameters have an effect and can be selected accordingly. Furthermore, the effectiveness of the ablation can also be adjusted by appropriately selecting the laser radiation's movement speed and frequency.
[0106] The removal of the coating, and thus the application of the grid surface, can alternatively or cumulatively be carried out using masking and unmasking methods. Such a method results in very homogeneous layers, which on the one hand produces an even clearer optical quality of the disk, and on the other hand, in the current process, leads to comparably short processing times as laser coating removal.
[0107] In a further step, the coated and (partially) structured second pane is bent within the range of the softening temperature of the respective glass. In this case, the laminated pane designed as a vehicle roof window is to be bent; therefore, the first and second panes are preferably bent before lamination and in any case after SAINT-GOBAIN SEKURIT FRANCE 2025008-WO-PCT
[0108] 21
[0109] Following the coating and stripping processes, the first pane undergoes a bending process to integrate the grid surface into the coating of the second pane. Preferably, the first and second panes are bent congruently together (i.e., simultaneously and using the same tool) because this ensures that the shapes of the panes are optimally matched for subsequent lamination. Typical temperatures for glass bending processes range from 500°C to 700°C.
[0110] Lamination is preferably carried out under the influence of heat, vacuum and / or pressure. Known lamination processes can be used, for example, autoclave processes, vacuum bag processes, vacuum ring processes, calender processes, vacuum laminators or combinations thereof.
[0111] Advantageously, the inventive method produces a vehicle roof panel as a composite panel, which exhibits very good functionality with regard to heat-reflective properties and simultaneously has a large area for the transmission of communication signals. The manufacturing process can be carried out without additional steps and, in particular, without significant adjustment effort when applying the grid surface, compared to known methods. It was surprisingly found that, during the stripping step, the flat second panel can be stripped with geometrically simple and straight lines, which minimizes the effort required for both laser stripping and masking / unmasking processes. The subsequent bending of the structured panel, preferably together with the first panel, produces deviations from the parallelism of the grid lines, at least in certain sections.However, it was found that these deviations did not attenuate the transmission of the communication signals, or only very slightly. A comparative measurement of a disk produced according to the invention and a completely stripped disk showed a difference of only approximately...
[0112] A 0.1 dB increase in the attenuation of the communication signal was detected.
[0113] In a further embodiment of the inventive method, the heat-reflecting coating is stripped in such a way that the resulting grid surface SAINT-GOBAIN SEKURIT FRANCE 2025008-WO-PCT
[0114] 22
[0115] an area of > 120 cm 2 , preferably from > 400 cm 2 , has or runs across the entire width of the second disc.
[0116] In a preferred embodiment of the method, the grid surface is arranged on the second pane such that it completely covers at least the area where additional antennas are provided in or on the vehicle roof pane. The antenna(s) can be integrated into the process at any desired stage. For example, the antenna(s) can be subsequently attached, e.g., glued, to the interior surface IV of the second pane, either in the coated area (structured or unstructured area) or in an area free of coating.
[0117] In a further embodiment of the process, a black print is additionally applied to the grid surface. Here, too, the step of applying the black print can be integrated into the process at any point. For example, the black print can be applied as an enamel print on the outside of the first disc.
[0118] The various embodiments of the invention can be implemented individually or in any combination. In particular, the features mentioned above and explained below can be used not only in the combinations specified, but also in other combinations or individually, without departing from the scope of the present invention.
[0119] The invention will now be explained in more detail with reference to exemplary embodiments and the accompanying figures. The figures do not limit the invention in any way. They show, in simplified, not-to-scale representations:
[0120] Fig. 1 is a highly schematic perspective view of a composite panel designed as a vehicle roof according to an embodiment of the invention, SAINT-GOBAIN SEKURIT FRANCE 2025008-WO-PCT
[0121] 23
[0122] Fig. 2 shows a highly schematic representation of the process for individual steps in the production of a vehicle roof panel according to the invention and
[0123] Fig. 3 is a highly schematic, simplified cross-sectional view of a vehicle roof panel according to the invention.
[0124] Figure 1 shows a curved laminated glass pane 100, designed as a vehicle roof window, schematically represented in a perspective view. The laminated glass pane 100 is curved, at least in sections, both longitudinally L and transversely B. According to the invention, it comprises a first pane 11 with an outer surface I and an inner surface II, a second pane 12 with an outer surface III and an inner surface IV, which is congruently bonded to the first pane 1 via a thermoplastic intermediate layer 13, and a heat-reflecting coating 6, which is applied to the inner surface IV of the second pane 12.The heat-reflecting coating 6 comprises a transparent conductive oxide selected from the group consisting of indium tin oxide, tin oxide doped with antimony or fluorine, aluminum-doped zinc oxide (ZnO:Al), gallium-doped zinc oxide (ZnO:Ga), or mixtures thereof, and preferably indium tin oxide. A grid surface 8 consisting of intersecting, stripped grid lines 7 is incorporated into the heat-reflecting coating 6. The grid lines 7 of the grid surface 8 are incorporated as mutually parallel stripped lines into the flat coated second disc 12, and the disc 12 is subsequently bent such that the grid lines 7 are no longer parallel, at least in sections, corresponding to the bending. In the illustrated embodiment of the invention, the grid surface 8 is arranged in the front edge region of the vehicle roof disc and extends almost over the entire width of the disc 100.Additionally, one or preferably several antenna(s) 15 are positioned in the same area, as indicated here. The enlarged section also schematically illustrates that the layers previously introduced as parallel grid lines no longer run parallel, at least in sections, in the subsequently curved disk. Depending on the curvature, both the longitudinal and transverse grid lines can exhibit deviations from their original parallelism. SAINT-GOBAIN SEKURIT FRANCE 2025008-WO-PCT.
[0125] 24
[0126] The present invention is also based on the finding that a curved disc 100 according to the invention exhibits sufficiently high transmittance for high-frequency electromagnetic radiation even with stripped line structures 7 that are not completely parallel. In other words, the stripped layers, initially introduced as parallel grid lines, exhibit at least partially unequal—or, to put it another way, irregular—spacing from one another in the finished curved disc 100. This makes the disc according to the invention easily distinguishable from previously known discs. Furthermore, it is not necessary to strip the transparent, electrically conductive coating over a large area. Stripped structures with only a small line width are sufficient, as they do not significantly impair the optical transparency or the aesthetic appearance of the disc.The non-parallel structures, at least in sections, can advantageously lead to the formation of fewer disruptive field-induced currents. Furthermore, this allows for high transmittance for high-frequency electromagnetic radiation (communication radiation) with very little structuring effort. At the same time, the process time and costs can be kept low. This is primarily due to the fact that during structuring—that is, during the introduction of the stripped linear regions 7 into the conductive coating 6 of the initially flat disk 12—a continuous laser movement can be performed without numerous settling points and the associated repositioning. In this way, a significantly faster structuring process time can be achieved.Similarly, suitable preparations known to experts can be used to employ masking for coating removal, which so far in production is no less fast in terms of process time than coating removal by laser.
[0127] Figure 2 shows, purely schematically, essential steps for the production of a vehicle roof window 100 according to the invention.
[0128] In step a), a heat-reflecting coating 6 is applied to the interior surface IV of the second disk. The heat-reflecting coating 6 comprises a transparent conductive oxide selected from the group consisting of indium tin oxide, antimony- or fluorine-doped tin oxide, aluminum-doped zinc oxide (ZnO:Al), gallium-doped zinc oxide (ZnO:Ga), or mixtures thereof, and preferably consists of indium tin oxide. SAINT-GOBAIN SEKURIT FRANCE 2025008-WO-PCT
[0129] 25
[0130] The heat radiation reflective coating 6 is preferably applied to the inner surface IV of the inner disk and / or to the outer surface I of the outer disk by physical vapor deposition (PVD), particularly preferably by cathode sputtering, and most preferably by magnetic field-assisted cathode sputtering.
[0131] In step b), a grid surface 8 consisting of intersecting, stripped grid lines 7 is introduced into the heat-reflecting coating 6 of the second disk 12. The grid lines 7 of the grid surface 8 are introduced into the flat, coated second disk 12 as stripped lines parallel to each other.
[0132] It is known to those skilled in the art to subsequently structure metallic layers or layer systems by mechanically or thermally removing the initially continuously deposited layer in a linear fashion, or to introduce structures by masking during the deposition process. In particular, extremely narrow lines can be generated in the layer using laser beams. According to the present invention, however, an oxide heat-reflecting layer 6 is processed by such linear removal through the introduction of a grid surface 8 with intersecting grid lines 7.
[0133] The laser is preferably guided at a speed of 100 mm / s to 60,000 mm / s. The laser preferably has a power output of 1 W to 10 kW and / or preferably comprises a carbon dioxide, YAG, Nd:YAG, ytterbium:YAG, holmium:YAG, erbium:YAG, neodymium glass, excimer, fiber, disk, slab, or diode laser. The laser is preferably guided by a plotter.
[0134] The coated surface of the second disk 12 can face the laser. Alternatively, if the disk is (largely) transparent to the laser radiation (especially in the case of a glass disk), the coated surface can face away from the laser, allowing the laser radiation to pass through the disk and onto the coating SAINT-GOBAIN SEKURIT FRANCE 2025008-WO-PCT
[0135] 26
[0136] The laser radiation is directed. In both cases, it is preferably focused onto the surface of the disk with the coating. The diameter of the laser spot on the coating is preferably from 25 pm to 250 pm, and particularly preferably from 40 pm to 180 pm.
[0137] Preferably, laser radiation in the UV, visible, or IR range of the electromagnetic spectrum is used. The wavelength of the laser radiation is preferably from 200 nm to 2000 nm, particularly preferably from 250 nm to 1100 nm, for example, from 355 nm to 1064 nm. This achieves particularly good results. Solid-state lasers (e.g., Nd:YAG or Yb:YAG lasers) can be used, which can be frequency-doubled, frequency-tripled, or frequency-doubled as required. Such lasers are widely used in industry, relatively inexpensive, and efficient. Alternatively, diode lasers, excimer lasers, gas lasers, or dye lasers can also be used.
[0138] The laser is preferably operated in pulsed mode. The pulse length of the laser is preferably in the femtosecond or nanosecond range. The pulse length is preferably at most 500 ns, and particularly preferably at most 300 ns. The pulse length is most preferably from 500 fs to 200 ns, and especially from 10 ps to 100 ns. This achieves particularly good results. Such short pulses minimize the thermal stress in the vicinity of the laser processing, thus enabling the processing of thin films and also heat-sensitive materials. The repetition frequency of the laser pulses is preferably from 10 kHz to 1000 kHz, and particularly preferably from 50 kHz to 400 kHz. The pulse energy is preferably from 1 mJ to 50 pJ, particularly preferably from 800 pJ to 20 pJ, and most preferably from 500 pJ to 50 pJ.
[0139] The output power of the laser is preferably from 10 W to 1000 W, preferably from 40 W to 500 W.
[0140] The laser radiation used can be adapted to the coating being processed in order to achieve effective ablation of at least the oxide coating, and possibly other layers, in the communication area to be produced. This is achieved in particular by selecting the wavelength, laser power, pulse energy, and pulse duration. All these parameters have an effect and can be selected accordingly. Furthermore, the effectiveness of the SAINT-GOBAIN SEKURIT FRANCE 2025008-WO-PCT
[0141] 27
[0142] Ablation can also be adjusted by appropriately selecting the speed and frequency of movement of the laser radiation.
[0143] The removal of the coating and thus the introduction of the grid surface 8 can alternatively or cumulatively be carried out using masking and unmasking methods. Such a method leads to very homogeneous layers, which on the one hand produces an even clearer optical quality of the disk, and on the other hand, in the current process, results in comparably short processing times as laser coating removal.
[0144] In a further step c), the coated and (partially) structured second pane 12 is bent in the range of the softening temperature of the respective glass. In this case, the laminated pane 100, designed as a vehicle roof pane, is to be bent; therefore, the first pane 11 and the second pane 12 are preferably subjected to a bending process before lamination and, in any case, after the coating processes and the stripping process for introducing the grid surface 8 into the coating 6 of the second pane 12. Preferably, the first pane 11 and the second pane 12 are bent congruently together (i.e., simultaneously and using the same tool) because this ensures that the shape of the panes is optimally matched for the subsequent lamination. Typical temperatures for glass bending processes are, for example, 500°C to 700°C.
[0145] Advantageously, the inventive method produces a vehicle roof window 100 as a laminated window, which exhibits very good functionality with regard to its heat-reflective properties and simultaneously has a large-area window 8 for the transmission of communication signals. The manufacturing process can be carried out without additional steps and, in particular, without significant adjustment effort when applying the grid surface 8, compared to known methods. It was surprisingly found that, during the stripping step, the flat second window 12 can be stripped with geometrically simple and straight lines, which minimizes the effort required in both the case of laser stripping and the case of the masking and unmasking process. The subsequent bending of the thus structured window 12, preferably SAINT-GOBAIN SEKURIT FRANCE 2025008-WO-PCT
[0146] 28
[0147] together with the first disk 11, it produces deviations from the parallelism of the grid lines 7, at least in sections. However, it was found that these deviations do not attenuate the transmission of the communication signals, or only very slightly. A comparative measurement of a disk produced according to the invention and a completely stripped disk showed a difference of only approximately
[0148] A 0.1 dB increase in the attenuation of the communication signal was detected.
[0149] Figure 3 shows a highly simplified cross-sectional view of a layered arrangement of a vehicle roof window 100 according to the present invention. The curved window 100, with its first window 11 and its second window 12, is shown straight (i.e., not curved) here for clarity. According to the invention, it comprises a first window 11 with an outer surface I and an inner surface II, a second window 12 with an outer surface III and an inner surface IV, which is congruently connected to the first window 1 via a thermoplastic intermediate layer 13, and a heat-reflecting coating 6 applied to the inner surface IV of the second window 12.The heat-reflecting coating 6 comprises a transparent conductive oxide selected from the group consisting of indium tin oxide, antimony- or fluorine-doped tin oxide, aluminum-doped zinc oxide (ZnO:Al), gallium-doped zinc oxide (ZnO:Ga), or mixtures thereof, and preferably consists of indium tin oxide. A grid surface of intersecting, stripped grid lines 7 is incorporated into the heat-reflecting coating 6. The grid lines 7 of the grid surface 8 are incorporated as mutually parallel stripped lines into the flat coated second disk 12, and the disk 12 is subsequently bent such that the grid lines 7 are no longer parallel, at least in sections, due to the bending. Additionally, two antennas 15 are positioned in the region of the grid surface 8.The area of the disc 100 shown, provided with grid lines 7, also includes a black print 14, which in the present embodiment is applied to surface I of the first disc 11. However, it can equally be provided on an inner surface (II, III) of the composite disc. This virtually conceals the optical difference of the area in which the grid surface 8 is incorporated. The black print area can be provided, in particular, in layers above the second disc 12, for example, on surface III of the second disc 12, as a coloring of the thermoplastic intermediate layer 13, or on one of the two SAINT-GOBAIN SEKURIT FRANCE 2025008-WO-PCT.
[0150] 29
[0151] Surfaces of the first pane. It can be produced, for example, by a black enamel print or by a functionally comparable black coloring. In particular, in combination with antennas 15 provided in the same area, an invisible communication window is created, which preferably extends over the entire width of the vehicle roof pane 100. SAINT-GOBAIN SEKURIT FRANCE 2025008-WO-PCT
[0152] 30 Reference sign list
[0153] OVehicle roof laminated glass pane
[0154] 2 vehicles
[0155] 6 Heat-reflective coating
[0156] 7 grid lines
[0157] 8 grid area
[0158] 11 first disc
[0159] 12 second disc
[0160] 13 thermoplastic intermediate layer
[0161] 14 Black print
[0162] 15 Antenna
[0163] I first surface of the first disk
[0164] II second surface of the first disk
[0165] III first surface of the second disk
[0166] IV second surface of the second disk
[0167] L Longitudinal direction of the vehicle window including bending B Transverse direction of the vehicle window including bending
Claims
SAINT-GOBAIN SEKURIT FRANCE 2025008-WO-PCT 31 Patent claims 1. Curved laminated glass pane (100), designed as a vehicle roof pane, comprising a. at least one first disk (11) with an outer surface (I) and an inner surface (II), b. a second disk (12) with an outer surface (III) and an inner surface (IV) which is congruently connected to the first disk (11) via a thermoplastic intermediate layer (13), wherein c. a heat-reflecting coating (6) is applied to the interior surface (IV) of the second disk (12), wherein the heat-reflecting coating (6) comprises a transparent conductive oxide selected from the group consisting of indium tin oxide, antimony- or fluorine-doped tin oxide, aluminum-doped zinc oxide (ZnO:Al), gallium-doped zinc oxide (ZnO:Ga) or mixtures thereof, and preferably indium tin oxide, wherein d. a grid surface (8) of intersecting, uncoated grid lines (7) is introduced into the heat-radiation-reflecting coating (6). characterized by the fact that the grid lines (7) of the grid surface (8) are introduced as parallel, uncoated lines into the flat coated second disk (12), the disk (12) is subsequently bent in such a way that the grid lines (7) are no longer parallel, at least in sections, according to the bending.
2. Laminated glass pane according to claim 1, characterized in that the grid area (8) has a size of > 120 cm² 2 , preferably from > 400 cm 2 and especially preferred by those > 500 cm 2 , has.
3. Laminated glass pane according to claim 2, characterized in that the heat radiation reflecting coating (6) is applied directly to the interior surface (IV) of the second pane (12).
4. Laminated glass pane according to claim 2 or 3, characterized in that the heat-reflecting coating (6) comprises an adhesion promoter layer and / or a cover layer. SAINT-GOBAIN SEKURIT FRANCE 2025008-WO-PCT 32 5. Laminated glass pane according to one of claims 1 to 4, characterized in that the grid lines (7) have a width of 40 pm to 250 pm, preferably of 70 pm to 200 pm.
6. Laminated glass pane according to one of claims 1 to 5, characterized in that the distance between parallel grid lines (7) is from 0.3 mm to 10 mm, preferably from 0.5 mm to 5 mm.
7. Laminated glass pane according to one of claims 1 to 6, characterized in that the maximum deviation in the distance of the formerly parallel grid lines (7) caused by the subsequent bending of the pane (12) is between 100 pm and 5.00 mm, preferably between 150 pm and 2.00 mm.
8. Laminated glass pane (100) according to one of claims 1 to 7, characterized in that the grid surface (8) extends over the entire width of the second pane (12).
9. Laminated glass pane (100) according to one of claims 1 to 8, characterized in that the grid surface (8) is arranged on the second pane (12) such that it completely covers at least the area in which antennas (15) are provided in or on the vehicle roof pane (100).
10. Laminated glass pane (100) according to one of claims 1 to 9, characterized in that the intersecting grid lines (7) are introduced parallel and orthogonal or at an angle of approximately 45° to the longitudinal edge of the flat second pane (12) before bending.
11. Laminated glass pane (100) according to one of claims 1 to 10, characterized in that the laminated pane (100) has a black printed area (14) in the region of the grid surface (8). SAINT-GOBAIN SEKURIT FRANCE 2025008-WO-PCT 33 12. Method for manufacturing a curved composite disc (100) designed as a vehicle roof disc, comprising at least the following steps: a) Providing a first disk (11) with an outer surface I and an inner surface II, a second disk (12) with an outer surface III and an inner surface IV, and at least one thermoplastic intermediate layer (13), wherein a heat-reflecting coating (6) is applied to the inner surface IV of the second disk (12), wherein the heat-reflecting coating (6) comprises a transparent conductive oxide selected from the group consisting of indium tin oxide, antimony- or fluorine-doped tin oxide, aluminum-doped zinc oxide (ZnO:Al), gallium-doped zinc oxide (ZnO:Ga) or mixtures thereof, and preferably indium tin oxide. b) Introducing a grid surface (8) consisting of intersecting, stripped grid lines (7) into the heat-reflecting coating (6) of the second disk (12), wherein the grid lines (7) of the grid surface are introduced into the flat coated second disk as stripped lines parallel to each other, c) Bending the first disk (11) and bending the coated and stripped second disk (12) with the grid surface (8) such that the grid lines (7) are no longer parallel at least in sections according to the bending, d) forming a stacking sequence from the first disk (11), the at least one thermoplastic intermediate layer (13) and the second disk (12) such that the inner surface II of the first disk (11) and the outer surface III of the second disk (12) face each other and the at least one thermoplastic intermediate layer (13) is arranged between the first disk (11) and the second disk (12); e) Joining the first pane (11) and the second pane (12) via the at least one thermoplastic intermediate layer (13) to form a composite pane (100) in a lamination process. SAINT-GOBAIN SEKURIT FRANCE 2025008-WO-PCT 34 13. Method according to claim 12, characterized in that the heat-reflecting coating (6) is stripped such that the resulting grid surface (8) has an area of > 120 cm² 2 , preferably from > 400 cm 2 , has or extends over the entire width of the second disk (12).
14. Method according to claim 12 or 13, characterized in that the grid surface (8) is arranged on the second disc (12) such that it completely covers at least the area in which additional antennas are provided in or on the vehicle roof disc.