Composite glass pane with electrically heatable camera window

Abstract

The invention relates to a composite pane (10) with an electrically heatable camera window (2), comprising a first electrically conductive transparent coating (6.1) for heating the camera window (2) within the camera window (2), wherein the first electrically conductive transparent coating (6.1) is arranged on a first surface (III) of an inner pane (1) within the camera window (2) and has two busbars (7.1, 7.2) for connection to a voltage source (9), which busbars are arranged on two opposite sides of the camera window (2) in such a way that, when a voltage is applied to the busbars (7.1, 7.2), an electrical current flows through the first electrically conductive transparent coating (6.1).

Description

[0001] This invention relates to a composite glass plate having an electrically heated camera window, particularly for use in a camera system, a method for manufacturing the same, and its applications.

[0002] Composite glass panels made of two or more glass or polymer glass sheets are used in vehicles as windshields, rear windows, side windows, and sunroofs. One or more functional coatings, which have infrared reflective properties, anti-reflective properties, or low-E properties, may be applied to each side of the glass sheet.

[0003] Modern vehicles are increasingly equipped with sensors, particularly driver assistance systems featuring a large number of optical sensors. These include, for example, optical cameras, but also radar systems, ultrasonic sensors, and Light Detection and Ranging (LiDaR). In motor vehicles, camera systems are placed in the passenger compartment behind the windshield. This provides a good view of the vehicle's surroundings and allows for timely identification of hazards and obstacles in road traffic.

[0004] Camera systems are typically protected from weather by corresponding glass plates; therefore, these plates should be as clean and free of condensation as possible to ensure sensor functionality. Since condensation and ice significantly affect electromagnetic wave transmission, they should be removed from the glass as quickly as possible. A wiping system ensures that water droplets and protective particles are removed from the glass plate. However, these are unusable in icy conditions, so the portion of the glass plate that serves as the camera's field of view must be briefly heated when necessary.

[0005] EP 1 605 729 A2 discloses an electrically heated glass plate with a camera window. The camera window is kept free of condensation and ice by a heating device. Heating elements are laminated into the glass plate at the location of the camera window, with the heating elements arranged adjacent to the field of view.

[0006] The purpose of this invention is to provide a composite glass plate with an electrically heatable camera window, which provides improved heating performance for the camera window.

[0007] According to the present invention, the object of the invention is achieved by a composite glass plate having an electrically heatable camera window according to claim 1. Preferred embodiments are known from the dependent claims.

[0008] The composite glass panel with an electrically heated camera window according to the present invention comprises at least one outer glass panel and an inner glass panel, which are planarly connected to each other by at least one thermoplastic interlayer. The outer glass panel has a first surface (I) facing away from the interlayer and a second surface (II) facing the interlayer. The inner glass panel has a first surface (III) facing the interlayer and a second surface (IV) facing away from the interlayer. Furthermore, the composite glass panel includes at least one optically transparent camera window and a first conductive transparent coating within the camera window for heating the camera window.

[0009] The first coating is particularly preferably disposed substantially entirely on the first surface (III) of the inner glass plate within the camera window. Within the scope of the invention, this essentially means that the camera window may have an additional uncoated communication window, and these values ​​may deviate by up to 30%. The first coating has a bus provided for connection to a voltage source, the bus being arranged on two opposite sides of the camera window such that current flows through the first coating when a voltage is applied to the bus.

[0010] The composite glass plate according to the present invention provides a significant improvement in rapidly heating the camera window. Uniform heat distribution and rapid heating efficiency are achieved by directly arranging low-ohm busbars within the camera window.

[0011] Surprisingly, it has been shown that this composite glass panel according to the invention achieves significantly improved heating efficiency within the camera window compared to windshields known to date.

[0012] The composite glass panel can be used in a variety of ways: when the composite glass panel is used as window glass in a vehicle, it can be, for example, a skylight, especially a windshield, rear window, or side window.

[0013] The composite glass panel with an electrically heated camera window according to the present invention is used to separate an internal space from the external environment. It comprises an inner glass panel and an outer glass panel. Under the manufacturing and use conditions of the composite glass panel according to the present invention, substantially all electrically insulating substrates that are thermally and chemically stable and dimensionally stable are suitable as the inner and outer glass panels.

[0014] The inner and outer glass panels preferably comprise glass, particularly flat glass, float glass, quartz glass, borosilicate glass, soda-lime glass, or transparent plastic, preferably rigid transparent plastic, especially polyethylene, polypropylene, polycarbonate, polymethyl methacrylate, polystyrene, polyamide, polyester, polyvinyl chloride, and / or mixtures thereof. The inner and outer glass panels are preferably transparent, particularly for use as windshields or rear windows in vehicles or for other applications requiring high light transmittance.

[0015] A glass panel having a transmittance of greater than 70% in the visible spectrum is understood to be transparent in the sense of this invention. However, for glass panels not in the driver's traffic-related field of vision, such as sunroof glass, the transmittance can also be much lower, for example, greater than 5%.

[0016] The thickness of the glass sheet can vary widely, thus allowing for excellent matching of individual requirements. Preferably, glass sheets with a standard thickness of 1.0 mm to 25 mm, preferably 1.4 mm to 2.5 mm, are used for vehicle glass. The size of the glass sheet can vary widely and depends on the dimensions required for the application according to the invention. The inner glass sheet and optionally the outer glass sheet have an area of, for example, 200 cm² to 20 m², common in the vehicle manufacturing industry.

[0017] The composite glass plate can have any three-dimensional shape. Preferably, the three-dimensional shape has no shaded areas, so it can be coated, for example, by cathode sputtering. Preferably, the substrate is planar or slightly or strongly curved in one or more spatial directions. Planar substrates are particularly preferred. The glass plate can be colorless or colored.

[0018] The interlayer preferably comprises at least one thermoplastic plastic, preferably polyvinyl butyral (PVB), ethylene vinyl acetate (EVA), and / or polyethylene terephthalate (PET). However, the thermoplastic interlayer may also comprise, for example, polyurethane (PU), polypropylene (PP), polyacrylate, polyethylene (PE), polycarbonate (PC), polymethyl methacrylate, polyvinyl chloride, polyacetic acid resin, casting resin, acrylate, fluorinated ethylene-propylene, polyvinyl fluoride, and / or ethylene-tetrafluoroethylene, or copolymers or mixtures thereof. The thermoplastic interlayer may be formed from one or more layers of thermoplastic film stacked together, wherein the thickness of the thermoplastic film is preferably from 0.25 mm to 1 mm, typically 0.38 mm or 0.76 mm.

[0019] The first surface (III) of the inner glass panel and the second surface (II) of the outer glass panel face each other and are connected to each other by a thermoplastic interlayer. The second surface (IV) of the inner glass panel and the first surface (I) of the outer glass panel face away from each other and away from the thermoplastic interlayer.

[0020] The camera window has optical transparency, meaning that its transmittance is preferably greater than 70% in the wavelength range of 400nm to 1300nm. The camera window preferably occupies less than 10%, and particularly preferably less than 5%, of the glass surface. The camera window is preferably square, rectangular, rhomboid, trapezoidal, hexagonal, octagonal, cross-shaped, elliptical, or circular in shape.

[0021] A first conductive coating is applied to the first surface (III) of the inner glass plate. Additionally, a further conductive coating may be applied to the second surface (II) of the outer glass plate.

[0022] Conductive transparent coatings according to the invention are known, for example, by EP 0 847 965 B1 or WO 2017 / 198362 A1. They typically comprise one or more, such as two, three, or four conductive functional layers. The functional layers preferably comprise at least one metal, such as silver, gold, copper, nickel, and / or chromium or a metal alloy. The functional layers particularly preferably comprise at least 90% by weight of metal, especially at least 99.9% by weight of metal. The functional layers can be composed of metal or metal alloys. The functional layers particularly preferably comprise silver or silver-containing alloys. Such functional layers exhibit particularly advantageous conductivity while maintaining high transmittance in the visible spectral range. The thickness of the functional layers is preferably from 5 nm to 50 nm, particularly preferably from 8 nm to 25 nm. Within this thickness range of the functional layers, advantageously high transmittance and particularly advantageous conductivity in the visible spectral range are achieved.

[0023] Typically, at least one dielectric layer is disposed between two adjacent functional layers of the coating. Preferably, another dielectric layer is disposed below the first functional layer and / or above the last functional layer. The dielectric layer comprises at least one monolayer of a dielectric material, such as a nitride like silicon nitride or an oxide like aluminum oxide. However, the dielectric layer may also comprise multiple monolayers, such as a monolayer of dielectric material, a smoothing layer, a matching layer, a barrier layer, and / or an antireflective layer. The thickness of the dielectric layer is, for example, from 10 nm to 200 nm.

[0024] This layer structure is typically obtained through a series of deposition processes using vacuum methods such as magnetic field-assisted cathodic sputtering.

[0025] Other suitable conductive coatings preferably include indium tin oxide (ITO), fluorine-doped tin oxide (SnO2:F), or aluminum-doped zinc oxide (ZnO:Al).

[0026] In principle, the first conductive transparent coating can be any coating capable of conducting electrical contacts and having sufficient transparency. In an advantageous embodiment, the conductive coating is a layer or a layer structure of multiple monolayers with a total thickness of less than or equal to 2 μm, particularly preferably less than or equal to 1 μm.

[0027] An advantageous conductive coating according to the invention has a surface resistivity of 0.4 ohms / square to 10 ohms / square. In a particularly preferred embodiment, the conductive coating according to the invention has a surface resistivity of 0.5 ohms / square to 1.5 ohms / square, particularly 1.3 ohms / square. Coatings with this surface resistivity are particularly suitable for heating automotive glass at typical automotive voltages of 12 V to 48 V, or up to 500 V in the case of electric vehicles.

[0028] The first conductive transparent coating has two buses for electrical contact. Electrical contact between the conductive coating and the power source is achieved via the buses. The buses can be arranged in a strip-like configuration on two opposite sides of the first conductive coating. Specifically, they can be formed as two generally parallel extending strips. The maximum spacing between the buses is 40 cm.

[0029] The busbar can have a width of 2 mm to 30 mm, particularly preferably 4 mm to 20 mm. Such a busbar is technically easy to manufacture and has advantageous current-carrying capacity, thus enabling good results in rapid heating. The length of the busbar depends on the size of the camera window or the area to be heated. The length of the busbar is typically substantially equal to the length of the side edges of the first conductive transparent coating, but can also be slightly smaller. In the case of such a busbar, the longer of its dimensions is referred to as the length, and the shorter of its dimensions as the width. More than two buses can also be arranged on the first conductive coating, preferably in the edge regions along the two opposite side edges of the first conductive transparent coating.

[0030] The layer thickness of the printed busbar is preferably 5 μm to 40 μm, particularly preferably 8 μm to 20 μm, and very particularly preferably 8 μm to 12 μm. Printed buses with these thicknesses are technically easy to implement and have advantageous current-carrying capacity. The specific resistivity ρ of the busbar... a The resistivity is preferably from 0.8 μΩ·cm to 7.0 μΩ·cm, and particularly preferably from 1.0 μΩ·cm to 2.5 μΩ·cm. Busbars with resistivity within this range are technically easy to implement and have advantageous current-carrying capacity. This results in good performance.

[0031] In one embodiment of the invention, the printed bus preferably comprises at least one metal, metal alloy, metal compound, and / or carbon, particularly precious metals and especially silver. The printing paste preferably comprises metal-containing particles, metal particles, and / or carbon, particularly precious metal particles, such as silver particles. Conductivity is preferably obtained through conductive particles. The particles may be located in an organic and / or inorganic matrix such as paste or ink, preferably as a printing paste containing glass frit. However, alternatively, the bus may also be formed as a strip of conductive film. In this case, the bus may, for example, comprise at least aluminum, copper, tin-plated copper, gold, silver, zinc, tungsten, and / or tin or alloys thereof. The thickness of the strip is preferably from 10 μm to 500 μm, particularly preferably from 30 μm to 300 μm.

[0032] Buses made of conductive films of these thicknesses are technically easy to implement and have advantageous current-carrying capacity. The strips can be conductively connected to conductive structures, for example, by solder, by conductive adhesive, or by direct lay-up. These materials and their thickness are particularly advantageous in terms of the bus's excellent conductivity.

[0033] The busbar is electrically contacted via one or more leads. These leads are preferably formed as flexible foil conductors (flat conductors, strip conductors). This is understood as an electrical conductor whose width is significantly greater than its thickness. Such foil conductors are, for example, strips or strips comprising copper, tin-plated copper, aluminum, silver, gold, or alloys thereof, or composed thereof. The foil conductor has a width of, for example, 2 mm to 16 mm and a thickness of, 0.03 mm to 0.1 mm. The foil conductor may have an insulating, preferably polymeric, sheath, such as a polyimide-based sheath. Foil conductors suitable for contacting conductive coatings in glass plates have a total thickness of only, for example, 0.3 mm. Such thin foil conductors can be easily embedded in thermoplastic interlayers between individual glass plates. Multiple electrically insulating conductive layers can be located within a single foil conductor strip.

[0034] Alternatively, thin metal wires can be used as electrical leads. These metal wires particularly comprise copper, tungsten, gold, silver, or aluminum, or alloys of at least two of these metals. The alloys may also contain molybdenum, rhenium, osmium, iridium, palladium, or platinum.

[0035] In another embodiment, the composite glass plate has a second conductive transparent coating on the first surface (III) of the inner glass plate, wherein the first and second conductive transparent coatings can be identical. Furthermore, the first and second conductive transparent coatings can have infrared reflective properties.

[0036] In an advantageous embodiment, the composite glass plate according to the invention has an uncoated separation line for electrically insulating the first coating from the second coating. Here, the separation line can at least partially, and especially completely, surround the camera window. This separates the first conductive transparent coating within the camera window from the second conductive transparent coating, and provides insulation from the second conductive transparent coating without short-circuiting. The second conductive transparent coating is then disposed outside the camera window on the first surface (III) of the inner glass plate. The second conductive transparent coating can preferably be current-free. In particular, it is not provided as a heating layer. The separation line can have a width of 30 μm to 200 μm, especially 80 μm to 120 μm.

[0037] In another advantageous embodiment of the invention, the camera window has at least one uncoated communication window for transmitting electromagnetic radiation, wherein the area of ​​the communication window is 10% to 30% of the area of ​​the camera window.

[0038] The composite glass panel is preferably a window glass for a vehicle, used in or provided in a window opening for the vehicle body.

[0039] In another aspect, the present invention includes a composite glass plate according to the invention serving as a windshield.

[0040] The inner and outer glass plates are laminated together by an interlayer, for example by autoclave method, vacuum bag method, vacuum ring method, calendering method, vacuum laminator or a combination thereof. Here, the joining of the outer and inner glass plates is usually carried out under the action of heat, vacuum and / or pressure.

[0041] The inner glass panel refers to the glass panel that faces the interior space of the vehicle from the installation location. The outer glass panel refers to the glass panel that faces the external environment of the vehicle from the installation location.

[0042] In another aspect, the invention includes a method for manufacturing a composite glass plate having an electrically heated camera window according to the invention, wherein...

[0043] • Apply the first conductive transparent coating to at least a portion of the first surface (III) of the inner glass plate.

[0044] • Two buses are applied to a first conductive transparent coating on opposite sides of the camera window, wherein the buses are arranged such that when a voltage is applied to the buses, current flows through the first coating.

[0045] • The first surface (III) of the inner glass plate with a conductive transparent coating is connected to the surface (II) of the outer glass plate through a thermoplastic interlayer.

[0046] The conductive coating of the first conductive transparent coating can be applied by methods known per se, preferably by magnetic field-assisted cathode sputtering. This is particularly advantageous in terms of the simplicity, speed, inexpensiveness, and uniform coating of the first glass plate. However, the conductive coating can also be applied, for example, by vapor deposition, chemical vapor deposition (CVD), plasma-assisted vapor deposition (PECVD), or by wet chemical methods.

[0047] The busbar is preferably applied by printing and baking conductive paste using a screen printing method or an inkjet method. Alternatively, the busbar can be applied as a strip of conductive film, preferably laid, soldered, or glued onto the conductive coating.

[0048] In screen printing, lateral shaping is achieved by pressing a printing paste containing metallic particles through a masking fabric. With appropriate masking, the width of the busbar can be predetermined and varied quite easily, for example.

[0049] Preferably, individual uncoated areas (recoating) are created in the conductive coating using a laser beam. Methods for structuring thin metal films are known, for example, from EP 2 200 097 A1.

[0050] Furthermore, the present invention includes the use of a composite glass panel with a heatable camera window according to the present invention in vehicles, ships, airplanes and helicopters, preferably as a windshield and / or rear window.

[0051] Within the scope of this invention, all embodiments mentioned for each feature can be freely combined with each other, as long as they do not contradict each other.

[0052] The invention will now be explained in more detail with the aid of the accompanying drawings and exemplary embodiments. The drawings are schematic illustrations and are not drawn to scale. The drawings do not limit the invention in any way.

[0053] in:

[0054] Figure 1 A top view of one embodiment of a composite glass panel with an electrically heated camera window according to the present invention is shown.

[0055] Figure 2 It shows Figure 1 A magnified view of the camera window in the image.

[0056] Figure 3 shows along Figure 2 Cross-sectional view of section line A-A' in the middle

[0057] Figure 4 It shows along Figure 2The cross-sectional view of the camera window along section line B-B' in the diagram, and

[0058] Figure 5 A flowchart of one embodiment of the method according to the present invention is shown.

[0059] Numerical descriptions should not be interpreted as precise values, but rather include tolerances of + / - 1% to at most + / - 10%.

[0060] Figure 1 A top view of a preferred embodiment of a composite glass panel 10 having a heatable camera window 2 according to the present invention is shown. The composite glass panel 10 can be used as a windshield of a passenger vehicle. For this purpose, the camera window 2 is centrally located at the upper edge region of the composite glass panel 10 serving as the windshield. The camera window 2 serves as a camera 5 ( Figure 3 The camera window 2 is defined as the view through which the camera 5 or the camera system passes, particularly the inner glass panel 10. Figure 3 The area of ​​the beam path (in the middle). The first conductive transparent coating 6.1 is completely applied within the camera window 2. The first conductive transparent coating 6.1 is almost imperceptible to the camera 5 and hardly interferes with the view through the composite glass plate 10.

[0061] In the installation position, the lower edge of the composite glass panel 10 is arranged downwards towards the direction of the passenger vehicle engine, while its upper edge (O), opposite to the lower edge (U), points upwards towards the roof. The camera window 2 is positioned approximately centered near the upper edge (O).

[0062] Figure 2 shows an enlarged view of the camera window 2 in Figure 1. Two buses 7.1 and 7.2 are provided for electrical contact with the first conductive transparent coating 6.1, and they are arranged on two opposite sides of the camera window so that current flows through the first conductive transparent coating 6.1 when a voltage is applied to the buses.

[0063] A first bus 7.1 is disposed on the first conductive coating 6.1 at the left edge region of the camera window 2. A second bus 7.2 is disposed on the first conductive coating 6.1 at the right edge region of the camera window 2. Buses 7.1 and 7.2 contain silver particles. They are applied to the first conductive coating 6.1 by screen printing and then baked. The lengths of buses 7.1 and 7.2 approximately correspond to the edge lengths of the camera window 2. When a voltage is applied to buses 7.1 and 7.2, a uniform heating current (indicated by arrows) flows through the first conductive transparent coating 6.1. The camera window 2 is heated by the heating current. Each bus 7.1, 7.2 is electrically connected to foil conductors 8.1, 8.2, which connect buses 7.1, 7.2 to a voltage source 9.

[0064] The first foil conductor 8.1 is electrically connected to the bus 7.1 by solder, conductive adhesive, or simply by being laid and pressed within the composite glass plate 10. Similarly, the second foil conductor 8.2 is electrically connected to the second bus 8.2. The foil conductors 8.1 and 8.2, for example, comprise tin-plated copper foil with a width of 10 mm and a thickness of 0.3 mm. The foil conductors 8.1 and 8.2 can also be converted into connecting cables for connection to a voltage source 9. The voltage source 9 provides, for example, the on-board voltage common for motor vehicles, preferably 12V to 15V, such as approximately 14V. Alternatively, the voltage source 9 can also have a higher voltage, such as 35V to 45V, especially 42V.

[0065] In the illustrated embodiment, buses 7.1 and 7.2 have a constant thickness of, for example, approximately 0.1 mm and a constant specific resistance of, for example, 2.3 μΩ·cm. When a voltage is applied to buses 7.1 and 7.2, current flows through the first coating 6.1. Buses 7.1 and 7.2 and their terminals may be covered by an opaque paint layer 11 (covering print).

[0066] Figure 3 It shows the passage along section line A-A'. Figure 1 The cross-section of the composite glass panel 10 according to the present invention is shown. The composite glass panel 10 includes an inner glass panel 1, which is connected to an outer glass panel 4 via an intermediate layer 3. The intermediate layer 3 may have a thermoplastic polymer film, preferably EVA, PU, ​​PVB, or mixtures, copolymers, or derivatives thereof. The intermediate layer 3 has a substantially constant thickness of 0.76 mm. Alternatively or additionally, the intermediate layer 3 may have two thermoplastic polymer films, preferably EVA, PU, ​​or mixtures, copolymers, or derivatives thereof. In the installed state, the inner glass panel 1 faces the interior space, such as the interior space of a vehicle.

[0067] The inner glass plate 1 and the outer glass plate 4 are made of, for example, soda-lime glass. The thickness of the outer glass plate 4 is, for example, 2.1 mm, and the thickness of the inner glass plate 1 is 1.6 mm or 2.1 mm.

[0068] A first conductive transparent coating 6.1 is disposed on the first surface (III) of the inner glass plate 1 facing the intermediate layer 3. The first coating 6.1 can be electrically contacted by two busbars 7.1 and 7.2. A colored paint layer 11 surrounds the camera window 2 of the composite glass plate 10.

[0069] A second conductive transparent coating 6.2 is also disposed on the first surface (III) of the inner glass plate 1 facing the intermediate layer 3, excluding the communication window 2. In this exemplary embodiment, the first coating 6.1 is electrically insulated from the second coating 6.2 by an uncoated separation line 12. The width of the separation line 12 is, for example, 70 μm. The camera window 2 is formed through the separation line 12 because the separation line 12 completely surrounds the first conductive coating 6.1. No electrical connection to a voltage source is provided on the second conductive transparent coating 6.2. Therefore, no busbar is disposed on the second conductive transparent coating 6.2.

[0070] The camera window 2 can be any area of ​​the composite glass plate 10 or the inner glass plate 1, whichever area has high transmittance for the corresponding optical and electromagnetic signals. Here, the camera window 2 is provided as an optical channel for the field of view of the camera 5. In addition, an uncoated communication window can be provided within the camera window 2 for transmitting electromagnetic radiation for other sensors mounted on the composite glass plate 10, wherein the area of ​​the communication window can be 10% to 30% of the area of ​​the camera window (2).

[0071] The camera window 2 is formed to be transparent, especially optically transparent. The camera 5, which is aimed at the camera window 2, is located in an encapsulation fixed to the inner glass plate 1.

[0072] A first coating 6.1 and a second coating 6.2 are disposed on the surface (III) of the inner glass plate 1 facing the intermediate layer 3. In this embodiment, the first coating 6.1 and the second coating 6.2 are identical. The first and second conductive coatings 6.1 and 6.2 are also sun-protective coatings, having preferably at least one conductive layer based on a metal, particularly silver. Such sun-protective coatings particularly have reflective properties in the near-infrared range, for example, in the range of 800 nm to 1500 nm.

[0073] Figure 4A cross-section of the heatable camera window 2 is shown. The first surface (III) of the inner glass plate 1 and the second surface (II) of the outer glass plate 4 face each other and are connected to each other by a thermoplastic interlayer 3. The second surface (IV) of the inner glass plate 1 and the first surface (I) of the outer glass plate 4 face away from each other and away from the thermoplastic interlayer 3. A first conductive transparent coating 6.1 is disposed on the surface (III) of the inner glass plate 1. A first busbar 7.1 is disposed at the left edge region of the camera window 2 on the first conductive coating 6.1. A second busbar 7.2 is disposed at the right edge region of the camera window 2 on the first conductive coating 6.1.

[0074] It has been found that the arrangement on the side (III) enhances the heating effect of the first coating in a way that is unforeseen due to the already known heating devices.

[0075] Figure 5 A flowchart illustrating an exemplary embodiment of a method for manufacturing a composite glass plate 10 having a heatable camera window 2 according to the present invention is shown. The method includes the following steps:

[0076] • Apply the first conductive transparent coating 6.1 to at least a portion (101) of the first surface (III) of the inner glass plate 1.

[0077] • Two buses 7.1 and 7.2 are applied to a first conductive transparent coating 6.1 on two opposite sides of the camera window 2, wherein the buses 7.1 and 7.2 are arranged such that when a voltage is applied to the buses 7.1 and 7.2, current flows through the first coating 6.1 (102).

[0078] • The first surface (III) of the inner glass plate 1 with a conductive transparent coating 6.1 is connected to the surface (II) of the outer glass plate 4 through a thermoplastic interlayer 3 (104).

[0079] List of reference numerals in the attached diagram:

[0080] 1. Inner glass plate

[0081] 2. Camera window

[0082] 3. Intermediate layer

[0083] 4. Outer glass panel

[0084] 5 cameras

[0085] 6.1 First conductive coating

[0086] 6.2 Second conductive coating

[0087] 7.1 First Bus

[0088] 7.2 Second busbar

[0089] 8.1 First Foil Conductor

[0090] 8.2 Second Foil Conductor

[0091] 9. Voltage source

[0092] 10 Composite Glass Panel

[0093] 11 paint layers

[0094] 12 Separation Line

[0095] (O) Top edge of the composite glass panel

[0096] (U) Lower edge of composite glass plate

[0097] (a) The first surface of the outer glass panel facing away from the intermediate layer

[0098] (ii) The second surface of the outer glass panel facing the intermediate layer

[0099] (iii) The first surface of the inner glass plate facing the intermediate layer

[0100] (iv) The second surface of the inner glass plate opposite to the intermediate layer

Claims

1. A composite glass panel (10) having an electrically heated camera window (2), comprising at least: • An outer glass panel (4) and an inner glass panel (1) are planarly connected to each other by at least one thermoplastic interlayer (3), wherein the outer glass panel (4) includes a surface (I) facing away from the interlayer (3) and a second surface (II) facing the interlayer, and the inner glass panel (1) includes a first surface (III) facing the interlayer and a second surface (IV) facing away from the interlayer. • At least one optically transparent camera window (2), • A first conductive transparent coating (6.1) within the camera window (2) for heating the camera window (2), The first conductive transparent coating (6.1) is disposed all over the first surface (III) of the inner glass plate (1) inside the camera window (2) and has two buses (7.1, 7.2) for connecting a voltage source (9), which are arranged on opposite sides of the camera window (2) such that when a voltage is applied to the bus (7.1, 7.2), current flows through the first conductive transparent coating (6.1), wherein the thickness of the bus (7.1, 7.2) is 5 μm to 40 μm.

2. The composite glass plate according to claim 1, wherein the width of the busbars (7.1, 7.2) is from 0.1 mm to 30 mm.

3. The composite glass plate according to claim 2, wherein the width of the busbars (7.1, 7.2) is 4 mm to 20 mm.

4. The composite glass plate according to any one of claims 1 to 3, wherein the busbars (7.1, 7.2) are formed from printed and baked printing paste.

5. The composite glass plate according to claim 4, wherein the printing paste comprises metal particles and / or carbon.

6. The composite glass plate according to claim 5, wherein the printing paste comprises silver particles.

7. The composite glass plate according to any one of claims 1 to 3, wherein the busbars (7.1, 7.2) are formed as two strips.

8. The composite glass plate according to claim 7, wherein the busbars (7.1, 7.2) are formed as two parallel extending strips.

9. The composite glass plate according to any one of claims 1 to 3, wherein the layer thickness of the busbars (7.1, 7.2) is 8 μm to 20 μm.

10. The composite glass plate according to claim 9, wherein the layer thickness of the busbars (7.1, 7.2) is 8 μm to 12 μm.

11. The composite glass plate according to any one of claims 1 to 3, wherein the first conductive transparent coating (6.1) has a surface resistance of 0.4 ohms / square to 10 ohms / square.

12. The composite glass plate according to any one of claims 1 to 3, wherein the composite glass plate (10) has a second conductive transparent coating (6.2) on the first surface (III) of the inner glass plate.

13. The composite glass plate according to claim 12, wherein the first conductive transparent coating (6.1) and the second conductive transparent coating (6.2) are the same.

14. The composite glass plate according to claim 12, wherein the first conductive transparent coating (6.1) and / or the second conductive transparent coating (6.2) have infrared reflective properties.

15. The composite glass panel according to claim 12, wherein an uncoated separation line (12) is provided for electrically insulating the first conductive transparent coating (6.1) from the second conductive transparent coating (6.2), wherein the separation line (12) at least partially surrounds the camera window (2).

16. The composite glass panel according to claim 15, wherein the separation line (12) completely surrounds the camera window (2).

17. The composite glass plate according to claim 15, wherein the width of the separation line (12) is 30 μm to 200 μm.

18. The composite glass plate according to claim 17, wherein the width of the separation line (12) is 80 μm to 120 μm.

19. The composite glass plate according to any one of claims 1 to 3, wherein the camera window (2) has at least one uncoated communication window for transmitting electromagnetic radiation through the composite glass plate, wherein the area of ​​the communication window is 10% to 30% of the area of ​​the camera window (2).

20. The composite glass panel according to any one of claims 1 to 3, wherein the composite glass panel (10) is a windshield.

21. A method for manufacturing a composite glass plate (10) according to any one of claims 1 to 20, wherein at least • Apply the first conductive transparent coating (6.1) to at least a portion of the first surface (III) of the inner glass plate (1). • Two buses (7.1, 7.2) are applied to a first conductive transparent coating (6.1) on opposite sides of the camera window (2), wherein the buses (7.1, 7.2) are arranged such that when a voltage is applied to the buses (7.1, 7.2), current flows through the first conductive transparent coating (6.1). • The first surface (III) of the inner glass plate (1) with a conductive transparent coating (6.1) is connected to the surface (II) of the outer glass plate (4) through a thermoplastic interlayer (3).

22. Use of the composite glass plate according to any one of claims 1 to 20 in a means of transport for land, air or water transportation.

23. Use of the composite glass plate according to any one of claims 1 to 20 in a motor vehicle.

24. Use of the composite glass panel according to any one of claims 1 to 20 as a windshield in a motor vehicle.

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