Vehicle window glass with transponder

Abstract

The invention describes a vehicle window pane (1), which comprises: a) a first glass substrate (7); b) a transponder (2), which has an antenna (4) and a control unit (3) for communicating with a reading device, wherein the control unit comprises a memory (3) for storing identification data, characterized in that a spaced-apart reflector (5) is assigned to the transponder (2) for increasing the antenna gain of the antenna (4), wherein the reflector (5) is constructed as a transparent, electrically conductive coating (5.1) and / or as a metal ring (5.3).

Description

Technical Field

[0001] The invention relates to a vehicle window pane having a transponder, a method for producing the vehicle window pane and the use of the vehicle window pane in a vehicle. Background Art

[0002] Transponders which are located on objects, such as goods and merchandise, and which are read by a reading device having a transmitting and receiving unit are generally known. Such transponders are used to identify these objects and are usually part of an identification system. Such systems for identification consist in particular of fixed The reader and the mobile transponder are composed, wherein the mobile transponder is placed on the object to be identified. Currently, the mobile transponder is an RFID (Radio Frequency IDentification) transponder, which is composed of an RFID chip and a separate antenna.

[0003] Reliability in the reading of identification signals is very important, for example in road traffic. The communication between the reading device and the mobile transponder with known radio technical problems of undesired reflections, absorptions and shielding often leads to unsatisfactory reading and writing results in the communication with the corresponding transponder. Known reading systems, which often have the shape of a gate through which the vehicle to be recorded and equipped with an RFID transponder travels, have the disadvantage that identification signals cannot sometimes be detected due to the low signal strength.

[0004] DE 20 2016 013 938 A1 describes a vehicle device (Fahrzeugvorrichtung) with an electronic identification and / or payment unit, which has an RFID unit. The RFID unit includes a reading element and an output element. The reading element is arranged in the interior space of the vehicle and detects the identification and / or payment information of the RFID chip. The detected identification and / or payment information is replicated and copied into the output element. The output element is arranged on the outside of the vehicle and forwards the identification and / or payment information to an external reading device without contact. In addition to the high consumption of electronic components required, the reading element must also be placed on the outside of the vehicle and is not shielded from the environment, so that undesirable interactions with the environment may occur. Summary of the invention

[0005] The object of the present invention is therefore to provide a vehicle window with a transponder which has an improved communication quality.

[0006] The object is thus achieved by a vehicle window pane and a vehicle. Preferred embodiments of the invention are reproduced in further exemplary embodiments.

[0007] The present invention therefore relates to a vehicle window pane, which comprises a first glass substrate (Glasscheibe) and a transponder. The transponder has at least one antenna and a control unit for communicating with a reading device, wherein the control unit comprises a memory for storing identification data. The control unit is preferably a semiconductor chip, which has a memory for storing identification data. Not only the control unit with the memory but also the antenna can be arranged on a substrate. The substrate can have a dielectric material, which is connected to the surface of the glass substrate via the outer surface of the substrate, preferably by bonding. The vehicle window pane has at least one reflector assigned to the transponder, which is spaced apart from the transponder and is provided for increasing the antenna gain (Antennengewinn) of the antenna, wherein the reflector is constructed as a transparent, electrically conductive coating and / or as a metal ring. The specific position on or in the vehicle window pane is derived from the term "assigned reflector" in the following way: the reflector naturally has to be assigned to the corresponding antenna position and in order to achieve enhanced must be adequately dimensioned for its function.

[0008] Furthermore, it is provided that the transponder and the reflector can be arranged within the vehicle window pane.

[0009] In order to increase the antenna gain of the transponder on the vehicle window, the radiation is bundled. By means of the reflector, the radiation of the antenna can be bundled in such a way that a higher antenna gain is obtained. The reinforcement of the signal sent and received by the transponder achieved in this way can be measured particularly well, in particular from a direction perpendicular to the surface of the vehicle window. By means of a higher antenna gain, the effective distance and sensitivity of the transponder are increased from a direction perpendicular to the surface of the vehicle window, so that the transponder can be detected from a greater distance by means of a corresponding external reading device. Signal here means high-frequency electromagnetic radiation within the scope of the present invention, wherein the high-frequency electromagnetic radiation is sent and / or received by a control unit via the antenna.

[0010] Advantageously, the vehicle window pane can be finished at the end of the production method or only later at the point of use by: That is, the transponder is fixed at the position provided for this purpose. Here, the substrate can be designed to be very thin and transparent, so that the transponder at the vehicle window is less noticeable. The substrate is advantageously of plate-shaped design and has a constant material thickness (thickness).

[0011] According to a preferred embodiment of the present invention, the reflector is constructed as a transparent, electrically conductive coating having a region that is transparent to electromagnetic radiation in the frequency range of the antenna. This embodiment is based on the following understanding: many vehicle windows have transparent, electrically conductive coatings. These transparent, electrically conductive coatings have various functionalities. For example, the transparent, electrically conductive coatings can be used as a heating device to remove moisture and ice from the vehicle window, or be provided for the reflection of thermal radiation.

[0012] The transparent, electrically conductive coating is preferably a functional coating, particularly preferably a functional coating with a sunscreen effect. The coating with a sunscreen effect has a reflection property in the infrared range and therefore in the solar incidence range. As a result, the heating of the interior space of a vehicle or a building due to solar radiation is advantageously reduced. Such coatings are known to those skilled in the art and typically contain at least one metal, especially silver or an alloy containing silver. The transparent, electrically conductive coating can include a sequence of multiple single layers, especially at least one metal layer and a dielectric layer, which, for example, contains at least one metal oxide. The metal oxide preferably contains: zinc oxide, tin oxide, indium oxide, titanium oxide, silicon oxide, aluminum oxide, etc. and a combination consisting of one or more thereof. The dielectric material can also contain silicon nitride, silicon carbide or aluminum nitride.

[0013] Such a layer structure is generally obtained by a sequence of deposition processes, wherein the deposition sequence is carried out by vacuum methods, such as magnetic field-supported cathode sputtering. Very fine metal layers can also be provided on both sides of the silver layer, which contain in particular titanium or niobium. The lower metal layer serves as an adhesion and crystallization layer. The upper metal layer serves as a protective and gettering layer to prevent changes in the silver during the other process steps.

[0014] Particularly suitable, transparent, electrically conductive coatings contain at least one metal, preferably silver, nickel, chromium, niobium, tin, titanium, copper, palladium, zinc, gold, cadmium, aluminum, silicon, tungsten or alloys thereof and / or at least one metal oxide layer, preferably tin-doped indium oxide (ITO), aluminum-doped zinc oxide (AZO), fluorine-doped tin oxide (FTO, SnO2:F), antimony-doped tin oxide (ATO, SnO2:Sb) and / or carbon nanotubes and / or optically transparent, electrically conductive polymers, preferably poly(3,4-ethylenedioxythiophene), polystyrene sulfonate, poly(4,4-dioctylcyclopentadithiophene), 2,3-dichloro-5,6-dicyano-1,4-benzoquinone, mixtures and / or copolymers thereof.

[0015] The thickness of the transparent, electrically conductive coating can vary widely and be adapted to the requirements of the individual case. The transparent, electrically conductive coating preferably has a layer thickness of 10 nm to 5 μm and particularly preferably 30 nm to 1 μm.

[0016] Surface resistance of the transparent conductive coating Preferably 0.35 ohm / square to 200 ohm / square, preferably 0.5 ohm / square to 200 ohm / square, very particularly preferably 0.6 ohm / square to 30 ohm / square and in particular 2 ohm / square to 20 ohm / square. In particular, when using a transparent electrically conductive coating, only a slight light transmission is required, the transparent electrically conductive coating can in principle have a surface resistance even lower than 0.35 ohm / square. The transparent electrically conductive coating preferably has good infrared reflection properties and / or a particularly low emissivity (Low-E).

[0017] The common feature of transparent electrically conductive coatings is that they are also impermeable to electromagnetic radiation in the high-frequency range. By using a transparent electrically conductive coating on all sides and over the entire surface The glazing of vehicles makes it almost impossible to send and receive electromagnetic radiation in the interior. In order to operate sensors, such as rain sensors, camera systems or stationary antennas, the coating is usually removed from one or two limited areas of the conductive transparent coating. This decoated area forms a so-called communication window or data transmission window. Such a communication window is arranged at an unspecified location of the substrate, for example in the area of ​​the interior rearview mirror of the windshield, and is covered by a black print and a plastic cover.

[0018] The transparent, electrically conductive coating is expediently designed for use as a reflector and can extend at least over a portion of the surface of the glass substrate or be integrated into an intermediate layer extending parallel thereto.

[0019] The transponder or the surface of the orthogonal projection of the transponder is arranged in a region of the transparent electrically conductive coating that is transparent to electromagnetic radiation in the frequency range of the antenna, in particular in a communication window. In other words, the region of the transparent electrically conductive coating that is transparent to electromagnetic radiation in the frequency range of the antenna overlaps the transponder in a perpendicular orientation with respect to the first glass substrate.

[0020] The region permeable to electromagnetic radiation consists, depending on the frequency, of only a circumference of a few centimeters around the transponder. In this advantageous embodiment, an additional production step is omitted, since the already existing transparent, electrically conductive coating can be used as a reflector.

[0021] The region transparent to electromagnetic radiation in the frequency range of the antenna can be designed as a coating-free region. The transponder is electrically insulated from the remaining transparent, electrically conductive coating for direct current by means of this coating-free region. The coating-free region is a region in which the transparent, electrically conductive coating has been removed, for example by laser ablation or grinding processes. This can be carried out industrially in a particularly simple and cost-effective manner.

[0022] Alternatively, the region transparent to electromagnetic radiation in the frequency range of the antenna can be implemented by laser cutting, wherein the coating is not formed over the entire surface in this region, but has a rectangular grid, a rhombus grid or a grid with an arbitrary shape. The grid consists of a plurality of surface elements. The surface elements are separated from one another and each have an extension or side length that is small in relation to the wavelength, less than one tenth of the wavelength. The maximum extension, in particular the side length, can be, for example, 1 mm to 0.1 mm.

[0023] If the transparent electrically conductive coating and the transponder are arranged in one plane, for example if the transponder is arranged on a substrate surface over which the transparent electrically conductive coating extends, the transparent electrically conductive coating can surround the transponder.

[0024] In another suitable extension of the present invention, the reflector can include a line conductor. The line conductor can be configured as a printed, conductive paste, preferably a silver-containing screen printing paste, or as a conductive conductor, preferably a conductive conductor made of metal and in particular of copper, silver, gold or aluminum. Copper has proven to be suitable for such a conductor because it has good electrical conductivity. At the same time, in the case of copper, the material costs are low.

[0025] The wire conductor is used as a reflector for reflecting electromagnetic waves and is suitably designed for this purpose, that is, the wire conductor has a length suitable for reflection in the desired frequency range. The wire conductor can also be designed, for example, in the form of a wire or a flat conductor. The wire conductor as a reflector is stable in operation and is stably fixed when placed on a vehicle window.

[0026] According to an advantageous embodiment of the invention, the reflector comprises two line conductors which are each arranged at the same distance from the transponder. Thus, a transponder having a reflector arrangement which is particularly easy to produce is possible.

[0027] According to a further advantageous embodiment of the invention, the reflector can be designed as a metallic closed ring. This has the advantage that, depending on the type of transponder, the reflection can be additionally intensified.

[0028] According to an advantageous embodiment of the invention, the transponder operates in an energy-autonomous manner.

[0029] According to another advantageous embodiment of the invention, the transponder is an RFID transponder. A UHF RFID transponder has, in particular, a semiconductor chip which is distinguished by its small size relative to the antenna.

[0030] In a further embodiment of the invention, the transponder operates in a frequency range of 800 MHz to 3 GHz, preferably up to 2.45 GHz, particularly preferably 860 MHz to 930 MHz. The dimensions of the antenna are generally dependent on the desired frequency band and the respective application.

[0031] Furthermore, it is proposed to provide identification data for identifying the vehicle. This advantageously allows an assignment of the transponder to the vehicle.

[0032] According to another advantageous embodiment of the invention, the first glass substrate is connected to the second glass substrate via a thermoplastic intermediate layer. Basically, all substrates that are thermally and chemically stable and dimensionally stable and electrically insulating under the conditions of production and use of the vehicle window pane according to the invention are suitable as glass substrates. The transponder is preferably attached to the inner surface of the first glass substrate.

[0033] Alternatively, the transponder and / or the reflector can be arranged in an intermediate layer between the first and second glass substrates.

[0034] In another advantageous embodiment of the vehicle window pane according to the invention, the transparent electrically conductive coating is located on at least one of the surfaces of the first and / or second glass substrate, in particular on the inner surface. Alternatively, the transparent electrically conductive coating can be integrated into the intermediate layer. The transparent electrically conductive coating is then preferably applied to a carrier film. The carrier film preferably contains a polymer, in particular polyvinyl butyral (PVB), ethylene vinyl acetate (EVA), polyurethane (PU), polyethylene terephthalate (PET) or a combination thereof.

[0035] The first and / or second glass substrate preferably comprises glass, particularly preferably flat glass, float glass, quartz glass, borosilicate glass, soda-lime glass or a transparent plastic, preferably a hard transparent plastic, in particular polyethylene, polypropylene, polycarbonate, polymethyl methacrylate, polystyrene, polyamide, polyester, polyvinyl chloride and / or mixtures thereof. The first and / or second glass substrate is preferably transparent, in particular for use in vehicles, for example as a windshield or rear window, or for other applications in which a high light transmission is desired. Thus, a substrate is understood to be transparent in the sense of the present invention if it has a transmittance in the visible spectral range of more than 70%. However, for vehicle windows that are not in the driver's traffic-related field of view, for example for roof windows, the transmittance can also be much lower, for example greater than or equal to 5%.

[0036] In the case of vehicle glazing, the first glass substrate and the second glass substrate are connected to each other via at least one intermediate layer. The intermediate layer is preferably transparent. The intermediate layer preferably contains at least one plastic, preferably polyvinyl butyral (PVB), ethylene vinyl acetate (EVA) and / or polyethylene terephthalate (PET). However, the intermediate layer can also contain, for example, polyurethane (PU), polypropylene (PP), polyacrylate, polyethylene (PE), polycarbonate (PC), polymethyl methacrylate, polyvinyl chloride, polyacetal resin, casting resin (Gieβharz), acrylate, fluorinated ethylene-propylene, polyvinyl fluoride and / or ethylene-tetrafluoroethylene or their copolymers or mixtures. The intermediate layer can be constructed by one or also by a plurality of films arranged one above the other or arranged adjacently, wherein the thickness of the film is preferably 0.025 mm to 1 mm, typically 0.38 mm or 0.76 mm. The intermediate layer can preferably be thermoplastic and after lamination, the first glass substrate and the second glass substrate and possibly other intermediate layers are bonded to each other.

[0037] The lamination, ie the connection of the first glass substrate and the second glass substrate via the intermediate layer, is preferably carried out under the action of heat, vacuum and / or pressure. Methods known per se for producing composite substrates can be used.

[0038] In another suitable extension, the vehicle window glass additionally has a surrounding frame-shaped decoating region, which has a width of 2mm to 20mm, preferably 5mm to 10mm. This region is used for electrical insulation between the voltage-carrying coating and the vehicle body. The surrounding frame-shaped decoating region is preferably tightly sealed (hermetisch versiegeln) by an acrylic adhesive or an intermediate layer as a vapor diffusion barrier. Through the vapor diffusion barrier, the coating sensitive to corrosion is protected from moisture and air oxygen. Additionally, the transparent conductive coating can be decoated in other regions, wherein the other regions are used as data transmission windows or communication windows, for example. The transparent substrate is permeable to electromagnetic radiation and especially infrared radiation in the other regions of the decoating.

[0039] According to the invention, the vehicle window pane is suitable for separating the interior of the vehicle from the external environment. A transponder reading device is located in the external environment (hereinafter referred to as the external space), wherein the reading device can receive the signal of the transponder.

[0040] The thickness of the first and / or second glass substrate can vary widely and can therefore be adapted to the requirements of the individual case. Standard thicknesses of 1.0 mm to 25 mm, preferably 1.4 mm to 2.5 mm, are preferably used for the vehicle glazing. The size of the first and / or second glass substrate can vary widely and depends on the size of the application according to the invention. The first glass substrate and / or the second glass substrate has, for example, a thickness of 200 cm in a vehicle structure. 2 Up to 3m 2 Common area.

[0041] The vehicle window pane can have any three-dimensional shape. Preferably, the three-dimensional shape does not have a shadow zone (Schattenzone), so that it can be coated, for example, by cathode sputtering. Preferably, the first glass substrate and the second glass substrate are flat or slightly or strongly curved in multiple directions or in one direction in the space. In particular, a flat substrate is used. The substrate can be colorless or colored.

[0042] In addition, the vehicle window pane has a conductor system with a heating function, which includes electrical resistor elements arranged between current-carrying busbars and used as heating conductors. The heating conductors consist of resistor wires that run vertically and essentially parallel to one another and have a diameter of approximately 20 μm to 200 μm, preferably 0.09 mm (90 μm). The resistor wires are preferably laid in a wavy manner at a mutual spacing of approximately 1 mm to 5 mm and run essentially perpendicular to the antenna of the transponder.

[0043] The vehicle window pane according to the invention is suitable for all vehicles, such as motor vehicles, trains, ships or aircraft, wherein motor vehicles are particularly preferred. Examples for suitable motor vehicles are buses, tractors, trucks and passenger cars, wherein passenger cars are particularly preferred.

[0044] In a preferred embodiment, the vehicle window is, preferably in a motor vehicle, a windshield, a roof window, a rear window, a rear side window or a front side window.

[0045] The combination according to the invention of the described technical features leads to a vehicle window in which the antenna gain of the transponder is optimized.

[0046] Another aspect of the invention comprises a method for manufacturing a vehicle glazing, wherein at least:

[0047] A transponder having an antenna and a control unit is fixed to the surface of the first glass substrate, to the surface of the second glass substrate, or between the first and second glass substrates for communication with a reading device, wherein the control unit has a memory for storing identification data; and

[0048] A spaced-apart reflector assigned to the transponder is applied to the surface of the first glass substrate, to the surface of the second glass substrate or between the first and second glass substrates in order to increase the antenna gain of the antenna.

[0049] In an advantageous embodiment of the method according to the invention, the transponder is arranged on a substrate, wherein the substrate is connected to the surface of the glass substrate by bonding with an adhesive.

[0050] The invention further comprises the use of a vehicle window pane according to the invention in a means of transport for land, air or water transport, in particular in a motor vehicle, for example as a windshield, side window, rear window and / or roof window.

[0051] The invention also relates to a vehicle comprising at least one vehicle window pane according to the invention, wherein the vehicle is preferably a motor vehicle.

[0052] The invention is explained in greater detail below on the basis of non-limiting exemplary embodiments with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] The invention is explained below and in the accompanying drawings. The drawings are not entirely to scale. The invention is not limited in any way by the drawings. In the drawings:

[0054] Figure 1a A top view of a vehicle window pane according to the invention with a transponder is shown;

[0055] Figure 1b A top view of an alternative vehicle window pane according to the invention with a transponder is shown;

[0056] Figure 2 An enlarged illustration of a detail from FIG. 1 with a transponder is shown;

[0057] Figure 3 Shown along Figure 2 The cross section of the section line A-A';

[0058] Figure 4 An example of a configuration of a vehicle window pane according to the invention with a transponder is shown;

[0059] Figure 5 Show Figure 4A cross-sectional illustration of a vehicle window glass in FIG.

[0060] Figure 6a Another embodiment example of a vehicle window pane according to the invention with a transponder is shown;

[0061] Figure 6b A plan view of another vehicle window pane according to the invention having a transponder is shown;

[0062] Figure 7 an exemplary power diagram showing a signal received by a transponder according to the present invention; and

[0063] Figure 8 A further exemplary power diagram of a signal received by a transponder according to the invention is shown. DETAILED DESCRIPTION

[0064] Next, the present invention will be described in detail with reference to the drawings. It should be noted that different aspects are described, which can be used separately or in combination. That is, each aspect can be used with different embodiments of the present invention unless explicitly shown as a pure alternative.

[0065] Furthermore, for the sake of simplicity, reference is always made to only one entity in each case below. However, unless explicitly stated otherwise, the present invention may also include a plurality of entities of the entities involved. In this regard, the use of the terms "a", "an", "an" is to be understood merely as a reminder of the use of at least one entity in a simple embodiment.

[0066] The specifications with numerical values ​​are not to be understood as exact values ​​in each case, but also include tolerances of from + / −1% up to + / −10%.

[0067] Figure 1a A top view of a vehicle window pane 1 according to the invention is shown. The vehicle window pane 1 is designed in this example as a windshield of a passenger car and is equipped with a transponder 2. The dimensions of the vehicle window pane 1 are, for example, 0.9 m×1.5 m. The transponder 2 is arranged in the lower side region of the vehicle window pane 1. Alternatively, the transponder 2 can be arranged at another location of the vehicle window pane 1, for example in the upper central region of the vehicle window pane 1. It is important here to find a suitable location with a good connection to the reading device.

[0068] The transponder 2 is a so-called UHF-RFID transponder (data carrier in the case of radio frequency identification) having an antenna 4 and a control unit 3 having a memory for storing identification data and for communicating with an external reading device (see Figure 2 ). If the transponder 2 is subjected to a corresponding electromagnetic alternating field, it transmits a personalized signal. That is, the electromagnetic alternating field must be modulated with a query signal. In order to read the transponder 2, an electromagnetic alternating field coordinated with the transponder 2 is generated by an external reading device. Such transponders operate in the frequency range of 860 MHz to 930 MHz, the so-called ultra-high frequency (UHF). Accordingly, the size of the antenna 4 is in tune with the stated frequency.

[0069] The transponder 2 can be designed as an active transponder or a passive transponder. The transponder 2 designed as an active one can receive energy for the signal emitted by the transponder from a separate energy source assigned to the transponder 2. The passive transponder 2 extracts energy from the energy of the electromagnetic alternating field generated by the reading device in order to transmit the personalized signal. After the transponder 2 has transmitted the signal, the signal is received by an external reading device that is present within the effective range of the signal.

[0070] Figure 1b A top view of an alternative embodiment of the vehicle window pane 1 in FIG1 is shown. In contrast to FIG1 , the transponder 2 is arranged in the upper region of the vehicle window pane 1. This arrangement is particularly advantageous if the transponder is within the effective range of the alternating field generated by the reading device and the reading device is arranged above the vehicle.

[0071] Figure 2 An enlarged illustration of a fragment of a vehicle window pane 1 according to the invention is shown in FIG. The vehicle window pane 1 comprises a transponder 2 and, for example, a transparent conductive coating 5.1 as a reflector 5 for increasing the antenna gain. The transparent conductive coating 5.1 has an uncoated region 6. The uncoated region 6 has a rectangular shape with a length of 130 mm and a width of 110 mm. The uncoated region 6 of the transparent conductive coating 5.1 overlaps the transponder 2 in a vertical orientation with respect to the vehicle window pane 1. The transponder 2 is arranged substantially in the center of the uncoated region 6. As a result, radiation is reflected by the transparent conductive coating 5.2. The bundling of the radiation leads to an enhanced antenna signal.

[0072] The length and width of the coating-free region 6 are adapted to the frequency range of the antenna 4. The antenna 4 can be a planar antenna having a symmetrical, meander-shaped structure.

[0073] Alternatively, the region 6 transparent to electromagnetic radiation in the frequency range of the antenna can be implemented by laser cutting. The transparent conductive coating 5.1 is then not removed over the entire surface in the region 6, but rather has a rectangular grid. The rectangular grid consists of a plurality of rectangular elements, which are isolated from each other and each have a side length that is less than one tenth of the wavelength of the electromagnetic radiation. The side length can be, for example, 1 mm to 0.5 mm, wherein the rectangle has a width of 0.1 mm.

[0074] Figure 3 A vehicle window pane according to the invention is schematically shown in cross section, which has a first outer glass substrate 7, an intermediate layer 8 and a second inner glass substrate 9. The intermediate layer 8 is a PVB film. In addition, further intermediate layers can be arranged between the first glass substrate 7 and the second glass substrate 9. These intermediate layers can have polyvinyl butyral, ethylene vinyl acetate, polyurethane and / or mixtures and / or copolymers thereof and can have polymer films. Preferably, a polyvinyl butyral (PVB) layer is used, which has a polyethylene terephthalate film (PET). Such an intermediate layer can have infrared reflection properties.

[0075] The second inner glass substrate 9 is provided, for example, to face the interior of the vehicle in the installed position. That is, the second inner glass substrate has an inner surface IV which is accessible from the interior. In contrast, the first outer glass substrate 7 is directed outwards with respect to the outer side surface I of the vehicle interior. The first outer glass substrate 7 and the second inner glass substrate 9 are composed, for example, of soda-lime glass. The thickness of the second inner glass substrate 9 is, for example, 1.6 mm and the thickness of the first outer glass substrate 7 is 2.1 mm. It is understood that the first inner glass substrate 7 and the second outer glass substrate 9 can also be configured to have the same thickness, for example. The intermediate layer 8 has a thickness of 0.76 mm.

[0076] The transponder 2 is arranged on the inner surface IV of the second inner glass substrate 9. The transponder 2 is located in the region of the vehicle window 1 in which the uncoated region 6 is arranged on the inner surface II of the first outer glass substrate 7. The uncoated region 6 is therefore located opposite the transponder 2. The uncoated region 6 is transparent to electromagnetic radiation in the frequency range of the antenna 4, so that the signal emitted by the antenna 4 from the vehicle interior in the direction of the vehicle exterior penetrates the second inner glass substrate 9 and the uncoated region 6.

[0077] exist Figure 4 It is shown in Figure 2An alternative embodiment of the vehicle window pane 1 according to the invention is shown in FIG. The transponder 2 is arranged in the intermediate layer 8 of the vehicle window pane 1. Figure 2 Differently, the reflector 5 assigned to the transponder 2 is constructed as an arrangement of two wire conductors 5.2. The transponder 2 is integrated in the intermediate layer 8 between the two wire conductors 5.2. The wire conductors 5.2 are arranged at the same distance from the transponder 2, so that the transponder 2 is located in the center between the two wire conductors 5.2. These wire conductors 5.2 are electrical conductors made of metal wires. The length of the wire conductor 5.2 is determined by the frequency used of the alternating field and is approximately half a wavelength (Lambda / 2*n) in a medium-shortened manner. At the operating frequency of the transponder of 860MHz, the wire conductors 5.2 each have a length of 16cm.

[0078] Alternatively or additionally, the transponder 2 and / or the line conductor 5.2 can be arranged on the inner surface IV of the second inner glass substrate 9. The line conductor 5.2 then consists of a silver-containing screen printing paste, which is applied to the vehicle window by baking or printing (Druck). The layer thickness of the baked silver paste is preferably 5 μm to 20 μm.

[0079] Figure 5 Show Figure 4 Illustration of a cross section of a vehicle window pane in Figure 1. Figure 2 In contrast, the transponder 2 and the reflector 5 assigned to the transponder 2 are arranged between a first outer glass substrate 7 and a second inner glass substrate 9. The reflector 5 consists of two line conductors 5.2 which are arranged at the same distance from the transponder 2.

[0080] exist Figure 6a It is shown in Figure 4 An alternative embodiment of the vehicle window pane 1 according to the invention is shown in FIG. Figure 4 In contrast, the transponder 2 and the reflector 5 are arranged on the inner surface IV of the second inner glass substrate 9. The reflector 5 is designed as a metallic, closed ring 5.3. The metallic, closed ring is an electrical conductor made of a silver-containing screen printing paste, which is applied to the vehicle window 1 by baking or printing.

[0081] Figure 6b A top view of an alternative embodiment of the vehicle window pane 1 is shown in FIG 6. In contrast to FIG 6 , the transponder 2 and the reflector 5 . 3 are arranged in the upper region of the vehicle window pane 1 .

[0082] Figure 7 Shown in accordance with Figure 2An exemplary power diagram of a transponder 2. A signal, the so-called forward signal, has been sent by an external reader and received by the transponder 2 with a spaced-apart assigned reflector 5.1. The signal power has been detected at the transponder 2 and is shown as a graph G1. As a graph G2, a reference power has been measured, in which a transponder was used without a reflector. It is clearly visible that the transponder 2 requires a smaller signal power to receive the forward signal with a reflector. As a result, the antenna gain is increased.

[0083] Figure 8 Shown in accordance with Figure 4 2. A signal, the so-called forward signal, has been sent by an external reader and received by the transponder 2 with a spaced-apart assigned reflector 5.2. The signal power has been detected at the transponder 2 and is shown as graph G1. As graph G2, a reference power has been measured, in which a transponder was used without a reflector. It is also evident here that the transponder 2 requires less signal power in order to receive the forward signal with a reflector. As a result, the antenna gain is increased.

[0084] The present invention provides a vehicle window 1 in which the signal of the transponder 2 is amplified in a perpendicular direction relative to the surface of the vehicle window. In an advantageous embodiment of the present invention, an increased antenna gain of the antenna 4 is achieved by correspondingly forming the transparent electrically conductive coating 5.1 as a reflector 5 with a coating-free region 6 and arranging the transponder 2 with the antenna 4 at a distance. This is surprising and surprising to a person skilled in the art.

[0085] Reference numerals list

[0086] 1. Transportation window glass

[0087] 2 Transponders

[0088] 3 Control unit

[0089] 4 Antenna

[0090] 5 Reflector

[0091] 5.1 Transparent electrical coating

[0092] 5.2 Wire conductor

[0093] 5.3 Ring

[0094] 6 The area that can be penetrated by electromagnetic radiation within the frequency range of the antenna

[0095] 7 First external glass substrate

[0096] 8 Middle Layer

[0097] 9 Second inner glass substrate

[0098] The outer surface of the first outer glass substrate 7

[0099] II Inner surface of the first outer glass substrate 7

[0100] III. Outer surface of the second inner glass substrate 9

[0101] IV: the inner surface of the second inner glass substrate 9.

Claims

1. A vehicle window glass (1), comprising: a) a first glass substrate (7); b) a transponder (2) having an antenna (4) and a control unit (3) for communicating with a reading device, wherein the control unit (3) comprises a memory for storing identification data, The vehicle window (1) has at least one reflector which is assigned to the transponder (2), is spaced apart from the transponder (2) and is provided for increasing the antenna gain of an antenna (4), wherein the reflector (5) is designed as a transparent, electrically conductive coating (5.1) or as a metal ring (5.3). 2 . The vehicle window pane ( 1 ) according to claim 1 , wherein the transparent electrically conductive coating ( 5 . 1 ) has a region ( 6 ) which is transparent to electromagnetic radiation in the frequency range of the antenna ( 4 ).

3. The vehicle window pane (1) according to claim 2, wherein the transponder (2) or a surface of an orthogonal projection of the transponder (2) is arranged in a region (6) which is transparent to electromagnetic radiation in the frequency range of the antenna (4).

4. The vehicle window pane (1) according to any one of claims 1 to 3, wherein the reflector (5) has at least one line conductor (5.2).

5. The vehicle window pane (1) according to any one of claims 1 to 3, wherein the reflector (5) has two line conductors (5.2), which are each arranged at the same distance from the transponder (2).

6. The vehicle window pane (1) according to any one of claims 1 to 3, wherein the reflector (5) is designed as a closed ring.

7. Vehicle window pane (1) according to any one of claims 1 to 3, wherein the transponder (2) operates in an energy-autonomous manner.

8. Vehicle glazing (1) according to any one of claims 1 to 3, wherein the transponder (2) is an RFID transponder.

9. Vehicle glazing (1) according to any one of claims 1 to 3, wherein the transponder (2) operates in a frequency range of 800 MHz to 3 GHz.

10. Vehicle glazing (1) according to claim 9, wherein the transponder (2) operates in a frequency range of up to 2.45 GHz.

11. Vehicle glazing (1) according to claim 9, wherein the transponder (2) operates in the frequency range of 860 MHz to 930 MHz.

12. The vehicle window pane (1) according to any one of claims 1 to 3, wherein identification data for marking a vehicle are provided.

13. Vehicle glazing (1) according to any one of claims 1 to 3, wherein the first glass substrate (7) is connected to a second glass substrate (9) via a thermoplastic interlayer (8).

14. Vehicle glazing (1) according to any one of claims 1 to 3, wherein the vehicle glazing is a motor vehicle glazing.

15. A vehicle comprising a vehicle glazing (1) according to any one of claims 1 to 12.

16. The vehicle of claim 15, wherein the vehicle is a motor vehicle.

17. A method for producing a vehicle glazing (1) according to any one of claims 1 to 14, wherein: At least: a) a transponder (2) having a control unit (3) for communicating with a reading device is fixed on the surface of a first glass substrate (7), on the surface of a second glass substrate (9), or between the first glass substrate (7) and the second glass substrate (9), wherein the control unit (3) has a memory for storing identification data and the antenna (4), and b) a spaced-apart reflector (5) assigned to the transponder (2) is arranged on the surface of the first glass substrate (7), on the surface of the second glass substrate (9), or between the first glass substrate (7) and the second glass substrate (9) in order to increase the antenna gain of the antenna (4).

18. Use of a vehicle glazing according to any one of claims 1 to 14, the vehicle glazing being applied in a vehicle for land traffic, air traffic or water traffic.

19. Use according to claim 18, wherein the vehicle glazing is used in a motor vehicle.

20. The use according to claim 18, wherein the vehicle window pane is used as a windshield, a rear window pane and / or a roof window pane.

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