Device for near-field communication through magnetically permeable and electrically conductive layers for vehicle locking systems

Abstract

The invention relates to a near-field communication device for use in a vehicle locking system and a corresponding vehicle locking system. The near-field communication device according to the invention comprises an antenna coil configured to receive and / or transmit near-field communication signals, and a magnetically permeable and / or electrically conductive layer. The magnetically permeable and / or electrically conductive layer is arranged above the antenna coil and has a recess that overlaps the antenna coil.

Description

AREA

[0001] The invention relates to a near-field communication device for use in a vehicle locking system, in particular a device for near-field communication through magnetically permeable and electrically conductive layers for vehicle locking systems and a corresponding vehicle locking system. BACKGROUND

[0002] "Keyless" passive locking systems, which allow a vehicle (or a vehicle component such as a tailgate) to be opened without the user actively operating a key, have become increasingly popular in the automotive sector in recent years. In addition to radio-based technologies such as Keyless Go, near-field communication technologies such as NFC (Near-Field Communication) are also used. For this purpose, a key device (e.g., a key card or a mobile phone) can be read contactlessly using a reading antenna attached to the vehicle with a corresponding counter antenna.

[0003] Near-field communication technologies are generally based on electromagnetic induction, which requires the generation of an alternating magnetic field at the location of the opposing antenna. However, magnetically permeable and / or electrically conductive layers can be located between the two antennas, which can at least partially shield such a magnetic field. A prominent example of this is chrome-plated surfaces, such as chrome-plated door handles, which are frequently used due to their robustness and optical properties. To solve this problem, plastic-bonded chrome coatings are known from the prior art. However, these coatings are less uniform and robust and have a more limited range of applications than, for example, electroplated chrome coatings. OVERVIEW

[0004] It is therefore an object of the invention to provide a device for use in a vehicle locking system which enables near-field communication through chrome-plated surfaces.

[0005] This object is achieved according to the invention by a near-field communication device for use in a vehicle locking system having the features of claim 1 and a vehicle locking system having the features of claim 14. Embodiments of the invention are specified in the dependent claims.

[0006] A near-field communication device for use in a vehicle locking system is provided, comprising an antenna coil for receiving and / or transmitting near-field communication signals and a magnetically permeable and / or electrically conductive layer arranged above the antenna coil. The magnetically permeable and / or electrically conductive layer has a recess overlapping the antenna coil.

[0007] The near-field communication device according to the invention is designed for use in a locking system on a vehicle. The locking system can, for example, be configured to lock the entire vehicle (e.g., all doors) or one or more vehicle parts (e.g., a tailgate or fuel tank flap, a hood, and / or a trunk).

[0008] The near-field communication device according to the invention can be configured to communicate with another near-field communication device (e.g., in an external key device) by means of the antenna coil according to one or more near-field communication transmission standards, such as an NFC standard (NFC: Near-Field Communication, e.g., ISO / IEC 14443). A resonant frequency of the antenna coil can be, for example, between 1 MHz and 50 MHz, preferably between 5 MHz and 20 MHz, and in particular 13.56 MHz (NFC standard). The antenna coil can be configured to receive or transmit the near-field communication signals (e.g., at least or primarily) from or in one communication direction, wherein the communication direction can be arranged, for example, parallel to a winding axis of the coil.

[0009] The magnetically permeable and / or electrically conductive layer can be arranged above the antenna coil in the communication direction, e.g., such that it can be located between the antenna coil and a counter-coil of the other near-field communication device. The layer can extend perpendicular to the communication direction or winding axis of the antenna coil. The layer can be a continuous or contiguous layer, which, for example, can have no further recesses or openings besides the recess overlapping the antenna coil. The layer can be formed as a single or multiple layer, i.e., a single layer or multiple sublayers. The layer can be applied to a substrate or carrier and can, in particular, be a surface coating. The substrate / carrier can be part of a mechanical actuating element of the vehicle locking system (e.g., a door handle).

[0010] The magnetically permeable and / or electrically conductive layer may contain paramagnetic and / or ferromagnetic materials, in particular soft magnetic materials such as iron or nickel. The layer (or a sub-layer thereof) may have a (relative) magnetic permeability of more than 1.5; in some examples, more than 3, in one example, more than 10, and in one example, more than 50. In some examples, the magnetic permeability of the layer (or the sub-layer thereof) may be up to 10 6 The layer (or a partial layer) thereof may have an electrical conductivity of more than 10 5 S / m, in some examples more than 10 6 S / m, in an example of more than 10 7 S / m and in one example of more than 5 · 10 7 S / m. In some examples, the electrical conductivity of the layer (or sub-layer thereof) can be up to 10 8S / m. Due to its magnetic permeability and / or electrical conductivity, the layer can at least partially shield magnetic fields generated by the antenna coil, for example due to partial magnetization of the layer and / or the induction of eddy currents in the layer.

[0011] The recess in the magnetically permeable and / or electrically conductive layer overlaps with the underlying antenna coil, e.g., viewed in the communication direction or parallel to the winding axis (i.e., in a projection onto a plane perpendicular to the communication direction or winding axis). The recess can partially overlap the antenna coil (e.g., more than 50%, in some examples, more than 75%, in one example, more than 90% of the cross-sectional area of ​​the antenna coil) or, preferably, completely (i.e., cover at least the entire cross-sectional area of ​​the antenna coil). The cross-sectional area of ​​the antenna coil can, for example, be the area enclosed by the outer circumference of the antenna coil. Magnetic fields generated by the antenna coil can at least partially penetrate the magnetically permeable and / or electrically conductive layer through the recess.

[0012] In a particularly preferred embodiment, one or more islands made of magnetically permeable and / or electrically conductive material are arranged in the recess. The islands can comprise the same material as the magnetically permeable and / or electrically conductive layer and, in particular, can be parts of the magnetically permeable and / or electrically conductive layer remaining in the recess. The islands can be spatially separated from one another and from the remaining layer, i.e., they can not be connected to one another by parts made of magnetically permeable and / or electrically conductive material. The islands are preferably electrically insulated from one another. By means of the islands, the recess can be given similar properties, e.g., with regard to mechanical stability, robustness, and / or visual appearance, to those of the magnetically permeable and / or electrically conductive layer surrounding it.Alternatively or additionally, the islands (and / or the recess) can be used, for example, to highlight the recess and thus the position of the antenna coil, e.g., to facilitate the positioning of an external key device.

[0013] At each location, the islands may each have a dimension (e.g., a width) in at least one direction parallel to the magnetically permeable and / or electrically conductive layer (e.g., perpendicular to the communication direction or winding axis) that is less than 25%, preferably less than 15%, in one example, less than 10% of the maximum extension of the antenna coil. In other words, at each point within an island, (at least) the smallest dimension (width), i.e., the minimum distance between opposite edges of the islands, may be smaller than the above-specified fraction of the maximum extension of the antenna coil. For example, the width of the islands may be between 1% (preferably 5%) and the above-specified fraction of the maximum extension of the antenna coil at each point.The extension of the antenna coil can also be measured parallel to the magnetically permeable and / or electrically conductive layer (e.g. in a plane perpendicular to the communication direction or winding axis) and can be, for example, an outer diameter, an outer width or an outer diagonal of the antenna coil.

[0014] A sum of the cross-sectional areas (parallel to the magnetically permeable and / or electrically conductive layer) of the islands arranged in the recess may be less than 50%, preferably less than 30%, in one example less than 20% and in one example less than 10% of a cross-sectional area of ​​the recess.

[0015] The recess and the islands are preferably formed such that a detuning of a resonant frequency of the antenna coil by the magnetically permeable and / or electrically conductive layer and the islands (e.g., compared to an intrinsic resonant frequency of the antenna coil or the resonant frequency of the antenna coil in the device according to the invention without or before the formation of the layer and islands) is less than 10%, preferably less than 5%, in one example less than 2%. This can be achieved, for example, by suitable selection of the dimensions, shape, and arrangement of the recess and islands, as well as the number of islands.

[0016] The islands arranged in the recess can be arranged such that no parts of the islands (preferably no magnetically permeable and / or electrically conductive material) are arranged at points of maximum magnetic field strength of a magnetic field generated by the antenna coil in the recess. The magnetic field in question can, for example, be a magnetic field generated by the antenna coil when transmitting a near-field communication signal or an alternating magnetic field generated by the antenna coil when energized with a sinusoidal current. In some embodiments, for example, parts of the islands can be arranged in no more than 50%, preferably no more than 80%, in one example in none of the regions in the recess in which the magnetic field strength reinforces at least 90% of the maximum magnetic field strength.

[0017] Alternatively or additionally, the islands arranged in the recess can be arranged such that the islands do not form a connection between incoming and outgoing field lines (i.e., the intersection points of the relevant field lines with the layer plane) of a magnetic field generated by the antenna coil in the recess. This can be advantageous, for example, for avoiding magnetic "short circuits." "No connection between incoming and outgoing field lines" is to be understood as meaning that no such connection is generated in regions of significant field strength (e.g., at least 80%, in some examples at least 50%, in one example at least 30% of the maximum magnetic field strength in the recess).

[0018] The islands may be portions of the magnetically permeable and / or electrically conductive layer remaining in the recess. The islands may, for example, have been formed together with the layer (e.g., by means of targeted or patterned deposition) or may have been formed after the layer was formed by subsequent patterning (e.g., removal or ablation) of portions of the layer.

[0019] The recess can contain between 2 and 50 islands, in some examples between 2 and 20 islands, in one example between 3 and 10 islands.

[0020] The recess preferably completely overlaps the antenna coil, e.g., such that, when projected along the communication direction or winding axis, the entire antenna coil is located within the outer circumference of the recess. The recess is preferably larger than the antenna coil and extends, for example, in at least one direction, preferably in each direction by at least 2 mm, in some examples at least 5 mm, in one example at least 10 mm beyond an outer edge of the antenna coil. A cross-sectional area of ​​the recess can, for example, be at least 110%, preferably at least 120%, in some examples at least 150%, and in one example at least 200% of the cross-sectional area of ​​the antenna coil and / or a maximum of 300%, in some examples a maximum of 200%, in one example a maximum of 150% of the cross-sectional area of ​​the antenna coil.

[0021] In a preferred embodiment, the magnetically permeable and / or electrically conductive layer has a chromium surface. Alternatively or additionally, the magnetically permeable and / or electrically conductive layer can comprise nickel and / or copper, e.g., one or more nickel sublayers and / or one or more copper sublayers. In one example, the magnetically permeable and / or electrically conductive layer is or comprises a chromium coating, in particular an electroplated chromium coating.

[0022] The recess can be filled with a filling, wherein the filling is preferably non-conductive (e.g. with an electrical conductivity of less than 10 4 S / m, in one example less than 10 3 S / m or 10 2S / m) and / or is non-magnetically permeable (e.g., with a magnetic permeability between 0.9 and 1.1, in one example between 0.95 and 1.05, in one example between 0.99 and 1.01). The filling may comprise plastic-bonded metal particles, in particular plastic-bonded chromium particles. Alternatively, instead of a filling, a corresponding insert may be arranged (e.g., inserted) in the recess.

[0023] Furthermore, a vehicle locking system is provided, which comprises a control unit and a near-field communication device according to one of the embodiments described herein. The control unit is configured to identify an external key device using the near-field communication device and to actuate a locking mechanism depending on the identity of the external key device.

[0024] The control unit can be implemented as hardware, software, or a combination thereof. The control unit can, for example, comprise a processor and a storage medium containing instructions for execution by the processor to provide the functionality described herein. The control unit can, in particular, be configured as a microcontroller. The control unit can be configured to determine whether the external key device has access authorization and, if so, to open the locking mechanism.

[0025] The external key device can comprise an external near-field communication device with a suitable counter coil for the antenna coil of the near-field communication device according to the invention. The external key device can be designed, for example, as a key card (e.g., smart card or key card) or as a mobile phone (e.g., smartphone).

[0026] The locking mechanism can be an external locking mechanism controlled by the vehicle locking system according to the invention, or it can be part of the vehicle locking system according to the invention. The locking mechanism can be configured to lock or release one or more vehicle parts, in particular one or more door or flap elements of a vehicle (e.g., a side door, a tailgate, a fuel tank or tailgate flap, or a hood).

[0027] The vehicle locking system may comprise a mechanical actuating element (e.g., a door or trunk handle, or a fuel filler flap or tailgate). The actuating element may be configured to open the respective door or flap element when actuated by a user or to trigger its opening (e.g., an automatic opening by means of an actuator). The mechanical actuating element may comprise the magnetically permeable and / or electrically conductive layer. The antenna coil may be arranged on or in the mechanical actuating element, in particular beneath the magnetically permeable and / or electrically conductive layer. SHORT DESCRIPTION OF THE CHARACTERS

[0028] The invention is explained in more detail below using exemplary embodiments with reference to the accompanying drawings. The figures show schematically: Fig. 1a: a near-field communication device for use in a vehicle locking system according to an example in a side cross-sectional view; Fig. 1b: the near-field communication device from Fig. 1a in a plan view; and Fig. 2: a vehicle locking system according to an example in a perspective exploded view. DESCRIPTION OF THE CHARACTERS

[0029] Fig. 1a, Fig. 1b show a schematic representation of a near-field communication device 100 for use in a vehicle locking system (not shown) according to an example, wherein the near-field communication device 100 in Fig. 1a in a lateral cross-sectional view and in Fig. 1b in plan view. The near-field communication device 100 can be used, for example, in the vehicle locking system 300 of Fig. 2 and, in particular, be integrated into it.

[0030] The near-field communication device 100 has an antenna coil 102, which is configured to exchange near-field communication signals with a corresponding counter-coil 202 in an external key device 200, such as a key card or a mobile phone, e.g., by means of a standardized near-field communication protocol such as an NFC protocol. For this purpose, the antenna coil 102 can have a suitable resonant frequency, such as 13.56 MHz. The antenna coil 102 can be configured to exchange the near-field communication signals along a communication direction, which can, for example, correspond to a winding axis of the antenna coil 102 and, for example, to the z-axis in Fig. 1a (according to the viewing direction in Fig. 1b) can be parallel. The antenna coil 102 can be formed, for example, as a wound coil (e.g., an air-core coil) or on a circuit board (e.g., a printed circuit board or a flexible circuit board).

[0031] The near-field communication device 100 further comprises a magnetically permeable and / or electrically conductive layer 104, which is arranged above the antenna coil 102 in the communication direction (ie between the antenna coil 102 and the counter coil 202) and in the example of Fig. 1a, Fig. 1b extends perpendicular to the communication direction in the xy plane. Layer 104 is in the example of Fig. 1a, Fig. 1b is formed as a chrome coating on a substrate or carrier 106 and can therefore also be referred to below as chrome coating 104. The substrate 106 can be formed, for example, from a plastic such as polycarbonate (PC) and / or acrylonitrile butadiene styrene (ABS), wherein the plastic can be glass fiber reinforced in some embodiments. The substrate 106 can be part of an element of the vehicle locking system, e.g., part of a mechanical actuating element such as the door handle 302 of Fig. 2. The antenna coil 102 may be embedded in the substrate 106 (as in Fig. 1a) or arranged thereon, e.g., on a surface of the substrate 106.

[0032] The chromium coating 104 may include several sub-layers or sub-layers (not shown), for example, a nickel layer (e.g., with a thickness between 1 µm and 10 µm, in one example, between 4 µm and 6 µm) on the substrate 106 (e.g., in direct contact with the substrate 106) and a chromium layer (e.g., with a thickness between 0.1 µm and 2 µm, in one example, between 0.5 µm and 1.0 µm) over the nickel layer (e.g., at the exposed surface of the chromium coating 104). Between the nickel layer and the chromium layer, further layers can be arranged, such as a copper layer (e.g. with a thickness between 10 µm and 100 µm, in one example between 30 µm and 40 µm) on the nickel layer and a further nickel layer (e.g. with a thickness between 10 µm and 50 µm, in one example between 15 µm and 30 µm) on the copper layer.In particular, the nickel layer(s) can impart high magnetic permeability to the chromium coating, while all of the aforementioned layers, and in particular the copper layer, can exhibit high electrical conductivity. The chromium coating 104 can, for example, be electroplated and / or sprayed onto the substrate 106.

[0033] A recess 108 is formed in the chromium coating 104, which completely overlaps the antenna coil 102, so that the antenna coil 102, viewed in plan along the z-axis / communication direction, is located completely within the recess 108 and is not obscured by the chromium coating 104. This ensures interference-free communication between the antenna coil 102 and the external key device 200, despite the magnetic permeability and electrical conductivity of the chromium coating 104. The recess 108 can, for example, extend beyond the outer edge of the antenna coil 102 by at least 5 mm in each direction, viewed along the communication direction.

[0034] In the recess 108, several islands 104A-C made of magnetically permeable and / or electrically conductive material are arranged. In the example of Fig. 1a, Fig. 1b, the islands 104A-C in the recess 108 are remaining portions of the chrome coating 104. The islands 104A-C can be formed, for example, by structured application of the chrome coating 104, for example, by means of a correspondingly structured electroplated seed layer, and / or suitable masking or shading. Alternatively or additionally, the islands 104A-C can be formed by subsequent structuring of the chrome coating 104, e.g., by means of laser cutting or ablation.

[0035] The islands 104A-C are not connected to each other and have small dimensions and cross-sectional areas compared to the antenna coil 102 and the recess 108. In particular, the islands 104A-C have a small width at each location, where the width can be defined as the smallest dimension of the corresponding island at the respective location. The widths of the islands 104A-C can, for example, be less than 15% of the maximum extent (e.g., the outer diagonal) of the antenna coil 102. The sum of the cross-sectional areas of all islands can, for example, be less than 20% of the cross-sectional area of ​​the recess 108 (each in the xy plane perpendicular to the communication direction). As a result, both the shielding of the magnetic field generated by the antenna coil 102 and the detuning of the resonant frequency of the antenna coil 102, 202 by the chromium coating 104 with the islands 104A-C can be minimized.

[0036] Furthermore, the islands 104A-C can be arranged such that there is no magnetically permeable and / or electrically conductive material at points of high magnetic field strength and no connection between incoming and outgoing field lines H is formed by the islands, as shown by way of example in Fig. 1a. In one example, all of the islands 104A-C are located within the inner circumference of the antenna coil 102.

[0037] In some embodiments, the recess 108 can be filled with a filling (not shown) made of a non-magnetically permeable and / or non-electrically conductive material. The filling can, in particular, contain plastic-bonded chromium particles. The chromium particles in the filling can be spatially separated from one another and electrically insulated by the plastic to further enable near-field communication through the chromium coating 104.

[0038] Fig. Figure 2 shows an exploded perspective view of a vehicle locking system 300 according to one example. The vehicle locking system 300 includes a mechanical actuating element 302, in this example a door handle, which can be attached, for example, to a side door of a vehicle (not shown). In other embodiments, the mechanical actuating element 302 can also be, for example, a trunk handle or a tailgate.

[0039] A near-field communication device according to the invention is integrated into the vehicle locking system 300, in the example of Fig. 2 a near-field communication device similar to the device 100 of Fig. 1a, Fig. 1b. The door handle 302 serves as a substrate / carrier 106 for the chrome coating 104 (in other words, the door handle 302 is completely or partially coated with the chrome coating 104). The antenna coil 102 can, for example, be embedded in the door handle 302 (e.g., overmolded) or arranged in a recess in its surface. A recess 108 is provided in the chrome coating 104 above the antenna coil 102 (in the example of the Fig. 2 in contrast to Fig. 1a, Fig. 1b but excluding islands 104A-C).

[0040] In the example of Fig. 2, the near-field communication device 100 has an insert 304 configured to be inserted into the recess 108 in the chrome coating 104, e.g., glued onto the door handle 302. The insert 302 is formed from a non-magnetically permeable and non-electrically conductive material, e.g., from plastic-bonded chrome particles. One or more islands 306 made of magnetically permeable and / or electrically conductive material are arranged in the insert 304. The islands 306 can, for example, be formed from the same material as the chrome coating 104 (or a partial layer thereof).

[0041] The vehicle locking system 300 also has a control unit 308, which is suitably connected to the antenna coil 102 and can be designed, for example, as a microcontroller. The control unit 308 can be arranged entirely or partially in or on the door handle 302 or else at another location in the vehicle, e.g., entirely or partially integrated into a vehicle control unit. The control unit 308 is configured to communicate with an external key device, such as the key device 200, by means of the near-field communication device 100. Fig. 1 (in Fig. 2 not shown) and to determine its identity, ie which key device it is. The control unit 308 is further configured to activate a locking mechanism (in Fig.2 not shown), e.g., to unlock the door handle 302 or a door associated with it. To do so, the control unit 308 can check whether the key device 200 has the appropriate authorization (e.g., is included in a list of authorized key devices) and, if so, actuate the locking mechanism, or otherwise refuse to actuate the locking mechanism.

[0042] The described embodiments of the invention and the figures serve only as examples. The invention may vary in form without changing the underlying functional principle. The scope of protection of the near-field communication device according to the invention and the vehicle locking system according to the invention arises solely from the following claims. LIST OF REFERENCE SYMBOLS 100 Near-field communication device 102 Antenna coil 104 magnetically permeable and / or electrically conductive layer / chrome coating 104A-C Islands of magnetically permeable and / or electrically conductive material 106 substrate / carrier 108 recess 200 external key device 202 Counter coil 300 vehicle locking system 302 mechanical operating element / door handle 304 deployment 306 islands of magnetically permeable and / or electrically conductive material 308 control unit H field lines QUOTES CONTAINED IN THE DESCRIPTION

[0000] This list of documents submitted by the applicant was generated automatically and is included solely for the convenience of the reader. This list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions. Cited non-patent literature

[0000] ISO / IEC 14443

[0008]

Claims

[1] Near-field communication device (100) for use in a vehicle locking system (300), comprising: an antenna coil (102) configured to receive and / or transmit near-field communication signals; and a magnetically permeable and / or electrically conductive layer (104) arranged over the antenna coil (102), wherein the magnetically permeable and / or electrically conductive layer (104) has a recess (108) overlapping the antenna coil (102). [2] Device (100) according to claim 1, wherein one or more islands (104A-C, 306) of magnetically permeable and / or electrically conductive material are arranged in the recess (108). [3] Device (100) according to claim 2, wherein the islands (104A-C, 306) have at each location in at least one direction parallel to the magnetically permeable and / or electrically conductive layer (104) a dimension which is less than 25%, preferably less than 15% of a maximum extension of the antenna coil (102). [4] Device (100) according to claim 2 or 3, wherein a sum of the cross-sectional areas of the islands (104A-C, 306) arranged in the recess (108) is less than 50%, preferably less than 30% of a cross-sectional area of ​​the recess (108). [5] Device (100) according to one of claims 2 to 4, wherein the recess (108) and the islands (104A-C, 306) are formed such that a detuning of a resonant frequency of the antenna coil (102, 202) by the magnetically permeable and / or electrically conductive layer (104) and the islands (104A-C, 306) is less than 10%, preferably less than 5%. [6] Device (100) according to one of claims 2 to 5, wherein the islands (104A-C, 306) arranged in the recess (108) are arranged such that no parts of the islands (104A-C, 306) are arranged at points of maximum magnetic field strength of a magnetic field generated by the antenna coil (102) in the recess (108). [7] Device (100) according to one of claims 2 to 6, wherein the islands (104A-C, 306) arranged in the recess (108) are arranged such that the islands (104A-C, 306) do not form a connection between incoming and outgoing field lines (H) of a magnetic field generated by the antenna coil (102) in the recess (108). [8] Device (100) according to one of claims 2 to 7, wherein the islands (104A-C, 306) remaining in the recess (108) are parts of the magnetically permeable and / or electrically conductive layer (104). [9] Device (100) according to one of claims 2 to 8, wherein between 2 and 50 islands (104A-C, 306) are arranged in the recess (108). [10] Device (100) according to one of the preceding claims, wherein the recess (108) completely overlaps the antenna coil (102) and preferably extends at least 2 mm in each direction beyond an outer edge of the antenna coil (102). [11] Device (100) according to one of the preceding claims, wherein the magnetically permeable and / or electrically conductive layer (104) has a chromium surface. [12] Device (100) according to one of the preceding claims, wherein the magnetically permeable and / or electrically conductive layer (104) comprises nickel and / or copper. [13] Device (100) according to one of the preceding claims, wherein a filling or an insert (304) is arranged in the recess (108) which comprises plastic-bonded metal particles, in particular plastic-bonded chromium particles. [14] Vehicle locking system (300) with a control unit (308) and a near-field communication device (100) according to one of the preceding claims, wherein the control unit (308) is configured to identify an external key device (200) by means of the near-field communication device (100) and to actuate a locking mechanism depending on the identity of the external key device (200). [15] Vehicle locking system (300) according to claim 14, further comprising a mechanical actuating element (302), in particular a door or trunk handle or a fuel tank or loading flap, wherein the mechanical actuating element (302) has the magnetically permeable and / or electrically conductive layer (104) and the antenna coil (102) is arranged on or in the mechanical actuating element (302).

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