Mounting device for holding a mobile phone in a motor vehicle

Abstract

A receiving device for receiving a mobile phone (61) in a motor vehicle, comprising a metal structure (2, 3, 9) by means of which the mobile phone (61) can be coupled to a motor vehicle antenna (64), and a charging device (62, 68) by means of which the mobile phone (61) can be wirelessly charged, characterized in that the metal structure (2, 3, 9) has a first metal structure element (2) and a second metal structure element (3), and that the two metal structure elements (2, 3) are interrupted or slotted in their aperture, so that the metal structure (2, 3, 9) comprising the two metal structure elements (2, 3) has a shielding effect by means of which the radiation of energy components and harmonics that arise during the wireless charging of the mobile phone (61) by means of the charging device (62, 68) into the environment, in particular into other components of the motor vehicle, can be reduced or avoided.

Description

[0001] The invention relates to a receiving device for receiving a mobile phone in a motor vehicle, comprising a metal structure by means of which the mobile phone can be coupled to a motor vehicle antenna, and a charging device by means of which the mobile phone can be charged wirelessly.

[0002] Such devices enable a wireless connection of the mobile phone to a vehicle antenna, such as a roof-mounted antenna, and also offer the possibility of wireless charging. This results in advantages regarding network coverage, communication quality, signal strength inside the vehicle, and battery operation. Regarding battery charging, advantages arise from the ability to recharge the battery while driving or to operate the mobile phone without power consumption and without a complicated connection.

[0003] Wireless charging of the mobile phone battery typically occurs according to the physical principle of inductive or capacitive energy transfer. This presents problems with charging the mobile phone because there is a risk that energy components from the energy transfer field and harmonics generated during wireless charging are radiated into the environment and, in particular, into other components of the vehicle.

[0004] A metal structure for electromagnetic coupling with a mobile phone antenna is known from the publication DE 10 2011 121 030 A1.

[0005] A receiving device for receiving and charging a rechargeable electrical device of a vehicle is known from the publication DE 10 2012 213 473 A1.

[0006] Based on the prior art described above, the invention aims to further develop the generic receiving device for receiving a mobile phone in a motor vehicle in such a way that the metal structure by means of which the mobile phone can be coupled to the motor vehicle antenna is designed and positioned in such a way that it is compatible with wireless charging and reliably suppresses the emission of energy components of the energy transmission field as well as harmonics thereof that can arise during the wireless charging of a mobile phone, while the function of the receiving device with regard to coupling the mobile phone to a motor vehicle antenna should not be impaired.

[0007] This problem is solved according to the invention by the metal structure of the receiving device comprising a first metal structure element and a second metal structure element, and by the fact that the two metal structure elements are interrupted or slotted in their aperture, so that the metal structure comprising the two metal structure elements has a shielding effect by means of which the radiation of energy components and harmonics generated during the wireless charging of the mobile phone by means of the charging device into the environment, in particular into other components of the motor vehicle, can be reduced or avoided. In the case of the receiving device according to the invention, the metal structure comprising the two metal structure elements acts simultaneously as a near-field antenna coupler and as a shielding element for the harmonics generated during the wireless charging of the mobile phone.The effectiveness of wireless charging is not noticeably impaired by the receiving device designed according to the invention.

[0008] Wireless charging can be achieved, for example, through inductive fixed coupling between the excitation and receiver coils. Power levels of up to 5 watts can be transmitted at an operating frequency between 100 and 200 kHz. Neither the fundamental nor the harmonics of the excitation field may cause undesirable EMC (electromagnetic compatibility) emissions and thus interfere with, for example, AM (amplitude modulation) broadcasting. For coupling the mobile phone to the vehicle's antenna, the metal structure of the mounting device according to the invention is designed as a capacitive near-field antenna coupler, suitable for converting electromagnetic fields in the cellular mobile communications range at frequencies, for example, between 700 and 2700 MHz.

[0009] According to an advantageous embodiment of the receiving device according to the invention, its metal structure includes a feed line which has an inner conductor and a shield conductor, wherein the inner conductor is connected to the first metal structure element and the shield conductor is connected to the second metal structure element.

[0010] The two metal structure elements are advantageously each connected to a ground potential at at least one ground connection, preferably via a low-pass filter.

[0011] According to an advantageous embodiment of the invention, a metal structure element of the metal structure is penetrated by the inner conductor of the feed line.

[0012] Advantageously, the two individual metal structure elements of the metal structure are designed similarly with regard to their shape, contour and extent.

[0013] The metal structure, which incorporates both coupling and shielding functionality, can be implemented particularly advantageously if the two individual metal structure elements are designed as a finger structure, preferably in one plane. Designing only one individual metal structure element as such a finger structure also offers significant advantages.

[0014] A further improvement results if the two metal structure elements of the metal structure each have a finger structure in a plane A and a finger structure in a plane B spaced apart from plane A.

[0015] Advantageously, one or each of the metal structure elements has a base block via which the two finger structures of the first metal structure element or the second metal structure element are connected to each other.

[0016] If the metal structure or the transition from the feed line to the metal structure has a balun, it is possible to transform asymmetrical high-frequency signals transported in the feed line into symmetrical high-frequency signals.

[0017] According to a further advantageous embodiment of the receiving device according to the invention, the inner conductor of the feed line of the metal structure widens smoothly and transitions into the first metal structure element, which has the two finger structures.

[0018] Advantageously, the feed line between a mobile radio device connection point and the two metal structure elements of the metal structure has a high-pass signal transmission characteristic.

[0019] Furthermore, it is advantageous if a low-pass or band-pass characteristic is implemented between the two individual metal structure elements of the metal structure and the other ground connections.

[0020] According to a further advantageous embodiment of the receiving device according to the invention, its metal structure incorporates an NFC (Nier Field Communication) antenna, which surrounds the metal structure by means of planar coils. Information can be exchanged between the mobile phone and the receiving device in a secure, near-field manner using this NFC antenna. For example, a carrier frequency of 13.56 MHz is used. Possible applications include Bluetooth Simple Pairing, driver authentication in the vehicle, access control, electronic road tolling, and the like. In the latter two applications, the authorization code can be stored in the vehicle and transmitted to the mobile phone via the NFC antenna, which in turn can act as a modem for a wireless long-range network.

[0021] For the most user-friendly operation possible of the recording device according to the invention, it is advantageous if capacitive touch sensor elements are assigned to its metal structure, which are arranged in metal-structure-free areas near the metal structure and by means of which an approach of the mobile phone to the recording device can be detected.

[0022] The metal structure is advantageously arranged on a support material.

[0023] The finger structures in plane A of the two metal structure elements are expediently arranged on one side of the support material and the finger structures in plane B of the two metal structure elements are arranged on the other side of the support material.

[0024] Advantageously, the finger structures in plane A are arranged offset from the finger structures in plane B, so that the fingers of the finger structures are assigned to finger-free apertures of the finger structures and finger-free apertures of the finger structures are assigned to fingers of the finger structures.

[0025] Furthermore, it is advantageous if the fingers of the finger structures of one metal structure single element are arranged perpendicular to the fingers of the finger structures of the other metal structure single element.

[0026] Ideally, the width of the fingers should correspond to the width of the apertures or supports formed between the fingers.

[0027] The width of the apertures or slots of the finger structures of the individual metal structure elements is expediently between 0.5 mm and 2.0 mm.

[0028] In an inventive method for operating a receiving device for receiving a mobile phone in a motor vehicle, the approach of the mobile phone to a metal structure of the receiving device is detected, then the mobile phone communicates with a control electronics of a charging electronics and, if communication between the mobile phone and the control electronics is realized, the mobile phone is wirelessly charged.

[0029] According to a further development of the inventive method, a mobile phone signal near-field coupling is realized between the recording device and the mobile phone during the wireless charging of the mobile phone.

[0030] Advantageously, communication via an NFC antenna is implemented during wireless charging of the mobile phone.

[0031] It is advantageous to have the capacitive touch sensor elements of the recording device in operation during wireless charging of the mobile phone.

[0032] The invention will now be explained in more detail with reference to embodiments and the drawing.

[0033] They show: Fig. 1 a basic system diagram of an embodiment of a receiving device according to the invention for receiving a mobile phone in a motor vehicle; Fig. 2 a first embodiment of a structural assembly showing a shield antenna of the receiving device according to the invention as shown in principle in 1; Fig. 3 a second embodiment of the structural assembly; Fig. 4 a third embodiment of the structural assembly; Fig. 5 a fourth embodiment of the structural assembly; Fig. 6 a fifth embodiment of the structural assembly; Fig. 7 a block diagram to illustrate a decoupling between the charging and coupling functionality of the structural assembly shown in 2 to 6; Fig. 8 a corresponding representation at the component level; and Fig. 9 a flowchart of the process realized by means of the recording device shown in 1.

[0034] One in Fig. 1 An embodiment of a receiving device according to the invention for receiving a mobile phone 61 in a motor vehicle, shown by means of a basic overview representation or a system diagram, has a structural assembly 1, a charging device 62, 68 and a baseboard 63.

[0035] The structural assembly 1 has a mobile device-side connection point 10, which is connected to a mobile phone external antenna or a vehicle antenna 64. Furthermore, the following are connected to the Fig. In the embodiment of the structural assembly 1 shown in Figure 1, a touch sensor element 51 and an NFC (Nier Field Communication) antenna 41 are provided. One functionality of the structural assembly 1 is to couple the mobile phone 61 to the vehicle antenna 64 via a mobile communication electromagnetic field 71.

[0036] The one in Fig. The charging device 62, 68 of the receiving device, shown below the structural assembly 1, is designed as a charging coil module 62 with a transmitting coil 68. The mobile phone 61 is wirelessly charged by means of the charging device 62, 68 via a charging energy field 72.

[0037] In addition to its coupling functionality already mentioned above, it is implemented in the Fig. In the embodiment of the receiving device shown in Figure 1, the structural assembly 1 has a further functionality, namely a shield, by means of which the emission of energy components and harmonics that arise during the wireless charging of the mobile phone 61 by means of the transmitting coil 68 of the charging coil module 62 into the environment is reduced or avoided.

[0038] The baseboard 63, which in the illustrated embodiment of the receiving device also belongs to it, has charging electronics 65, which is connected to the transmitting coil 68 of the charging device 62, 68, control electronics 66, which is connected to the charging electronics 65 provided on the baseboard 63 and to the touch sensor element 51 provided on the structural assembly 1, and an NFC circuit part 67, which is connected on the one hand to the NFC antenna 41 provided on the structural assembly 1 and on the other hand to the control electronics 66 provided on the baseboard 63.

[0039] The mobile phone 61 is coupled to the structural assembly 1 with respect to received and transmitted signals by means of the mobile phone electromagnetic field 61 formed between the structural assembly 1 on the one hand and the mobile phone 61 located in the receiving device on the other. The structural assembly 1, and thus the mobile phone 61, is connected to the vehicle antenna 64 via the mobile phone connection point 10 provided on the structural assembly 1.

[0040] With regard to the charging energy field 72 acting between the charging device 62, 68 and the mobile phone 61, which serves to transport energy between the transmitting coil 68 of the charging device 62, 68 and the mobile phone 61, the structural assembly 1 acts as a shield by means of which the harmonic component of the charging energy field 72 is dampened, so that energy components and harmonics that arise during the wireless charging of the mobile phone 61 cannot penetrate into the vicinity of the receiving device.

[0041] The transmitting coil 68 of the charging device 62, 68 is controlled by means of the charging electronics 65 provided on the base board 63.

[0042] The approach of an object, for example the mobile phone 61, to the receiving device can be detected by means of the touch sensor element 51 provided on the structural assembly 1, which is connected to the control electronics 66 provided on the baseboard 63.

[0043] As already mentioned, the NFC circuit part 67 provided on the baseboard 63 is connected to the NFC antenna 41 arranged on the structural assembly 1, the NFC antenna 41 being designed as a separate element of the NFC circuit part 67 and integrated into the structural assembly 1 which is designed as a flat assembly.

[0044] For communication, the control electronics 66 is connected to the charging electronics 65, which are also provided on the baseboard 63, and to the NFC circuit part 67, which is also provided on the baseboard 63.

[0045] One in Fig. The first embodiment of the structural assembly 1, which is provided with coupling functionality and shielding functionality, is shown in Figure 2 and has a metal structure 2, 3, 9, to which a [missing information] is attached. Fig. 2. The first metal structure element shown on the left, 2, is in Fig. The second metal structure element 3 shown on the left and a feed line 9 belong to the structure assembly 1. The first metal structure element 2, the second metal structure element 3, and the feed line 9 are made of an electrically conductive material and are applied as thin layers to a substrate 4 of the structure assembly 1. The two metal structure elements 2 and 3 and the feed line 9 are arranged symmetrically with respect to a symmetry line 11 of the structure assembly 1, which extends along its longitudinal direction or longitudinal axis.

[0046] The input of the feed line 9 is the mobile device-side connection point 10 of the structural assembly 1. The feed line 9 has an inner conductor 23 and a shield conductor 24 arranged symmetrically or coaxially to it. The inner conductor 23 of the feed line 9 penetrates the second metal structure element 3 of the metal structure 2, 3, 9 centrally and is connected to the first metal structure element 2 of the metal structure 2, 3, 9 at a feed point 7. The second metal structure element 3 of the metal structure 2, 3, 9 is connected to the feed line 9 via the inner conductor 23 of the feed line 9. Fig. Two approximately equally sized metal structure individual element parts 3a, 3b divided.

[0047] The shield conductor 24 of the feed line 9, which is symmetrical to the inner conductor 23, transitions into the second metal structure element 3 of the metal structure 2, 3, 9.

[0048] Both the first metal structure element 2 and the second metal structure element 3 of the metal structure 2, 3, 9 have an element surround 26 and each consists of a finger structure 27 on a plane A and a finger structure 28 on a plane B. The plane A of the finger structure 27 can, for example, be located on the top side of the support material 4 and the plane B of the finger structure 28 on the bottom side of the support material 4 of the structural assembly 1.

[0049] The finger structure 27 on level A and the finger structure 28 on level B, for example, have a finger or slot width of 0.5 to 2.0 mm. The finger structures 27, 28 are arranged on the top and bottom surfaces of the carrier material 4, respectively, such that the fingers of finger structure 27 correspond to the slots of finger structure 28; that is, the slots of finger structure 27 in level A are covered by the fingers of finger structure 28 in level B, and the slots of finger structure 28 in level B are covered by the fingers of finger structure 27 in level A.

[0050] The finger structure 27 provided in plane A and the finger structure 28 provided in plane B are electrically connected to each other by means of a through-hole 25 and / or the element surround 26.

[0051] As can be seen from the presentation in Fig. As can be seen from 2, the finger structures 27, 28 of the first metal structure single element 2 are arranged perpendicular to the finger structures 27, 28 of the second metal structure single element 3 of the metal structure 2, 3, 9.

[0052] The finger structures 27 on level A and the finger structures 28 on level B of the metal structure elements 2, 3 are electrically connected to the mobile device-side connection point 10 of the structure assembly 1 via the feed line 9. Furthermore, the two metal structure elements 2, 3 of the metal structure 2, 3, 9 are connected to ground connections 21 via low-pass filters 22.

[0053] The structural assembly 1 described above, comprising the metal structural elements 2, 3, serves on the one hand as an electromagnetic near-field coupler between the mobile phone 1 and the vehicle-side mounting device and on the other hand as a shield, by means of which harmonics of the mobile phone electromagnetic field 71, by means of which the wireless charging of the mobile phone is accomplished by means of the charging device 62, 68, are dampened, without significantly reducing the efficiency of the wireless charging.

[0054] One in Fig. 3 The embodiment of the structural assembly 1 of the receiving device according to the invention is provided with a balun 29 by means of which unbalanced high-frequency signals transported on the feed line 9 are converted into symmetrical high-frequency signals.

[0055] At the in Fig. In the embodiment of the structural assembly 1 shown in Figure 3, a first base block 30 is assigned to the first metal structure element 2 and a second base block 31 to the second metal structure element 3. Both the first base block 30 and the second base block 31 serve to transform the finger structure 27 in the A-plane and the finger structure 28 in the B-plane of the two metal structure elements 2, 3 into a planar extension and to accommodate the vias 25 that electrically connect the finger structure 27 in the A-plane to the finger structure 28 in the B-plane.

[0056] In the case of the in Fig. In the embodiment of the structural assembly 1 shown in section 4, the shield conductor 24, as part of the feed line 9, goes directly into a [missing information] in [missing information]. Fig. The first base block 30 is assigned to the left metal structure single element 3a and the second base block 31 is assigned to the right metal structure single element 3b of the metal structure 2, 3, 9. The first base block 30 serves to connect the left metal structure single element 3a and the second base block 31 serves to connect the right metal structure single element 3b.

[0057] The inner conductor 23 of the feed line 9 expands in the case of the in Fig. 4 shown embodiment of the structural assembly 1 gradually to the first metal structure element 2 of the metal structure 2, 3, 9 of the structural assembly 1.

[0058] In the case of the in Fig. In the embodiment of the structural assembly 1 of the receiving device according to the invention shown in Figure 5, the NFC antenna 41 is additionally provided on the structural assembly 1. The NFC antenna 41, like the remaining metal structure 2, 3, 9, is also located on the substrate material 4. An NFC connection point 42 is provided on the structural assembly 1 for the electrical connection of the NFC antenna 41. In the illustrated embodiment of the structural assembly 1, the NFC antenna 41 surrounds the metal structure 2, 3, 9 in planar coils.

[0059] The in Fig. The embodiment of the structural assembly 1 of the receiving device according to the invention shown in Figure 6 is supplemented by touch sensor elements 51, which, like the rest of the metal structure 2, 3, 9, are also located on the carrier material 4.

[0060] From the in Fig. The block diagram shown in Figure 7 shows that the high-frequency signal is routed from the mobile device connection point 10 of the structural assembly 1 via the inner conductor 23 and the shield conductor 24 of the feed line 9.

[0061] The inner conductor 23 can be connected, as in Fig. Figure 7 shows a high-pass filter 19 connected to it. At the output of the high-pass filter 19, the high-frequency signal goes directly to the first metal structure element 2 of the metal structure 2, 3, 9 and via the low-pass filter 22 to the ground connection 21.

[0062] Similarly, a high-pass filter 19 can be connected to the shield conductor 24 of the feed line 9. At the output of the high-pass filter 19, the high-frequency signal goes directly to the second metal structure element 3 of the metal structure 2, 3, 9 and also via the low-pass filter 22 to the ground connection 21.

[0063] If the high-pass 19 is not provided, the connection from its inlet to its outlet is simply closed.

[0064] As can be seen from the representation at component level according to Fig. As 8 results, the mobile device-side connection point 10 is designed as a coaxial connection device, with the inner conductor 23 surrounded by the shield conductor 24, which is designed as an outer sheath. The high-pass filter 19 is implemented by means of coupling capacitors. The low-pass filter 22 is designed as a series arrangement of capacitor and inductor. Its cutoff frequency is selected such that the frequency of the charging energy field 72 is in the passband and the mobile phone electromagnetic field 71 is in the stopband.

[0065] During operation of the recording device according to the invention, as can be seen from the flowchart in Fig.9 results in the following: after the start in step 01, the touch sensor elements 51 provided on the structural assembly 1 are detected when an object, e.g. the mobile phone 61, has approached the receiving device or its structural assembly 1, which takes place in step 02.

[0066] In step 03, the charging electronics 65 attempts to establish communication with the mobile phone 61 via the transmitting coil 68 in accordance with the charging specification.

[0067] If, in step 04, it is determined that communication between the charging electronics 65 and the mobile phone 61 has been successfully established, the receiving device transitions to wireless charging in step 05. If, in step 04, successful communication between the charging electronics 65 and the mobile phone 61 is not determined, the receiving device transitions to operational readiness immediately after step 01 or to step 02 in step 06.

Claims

[1] Receiving device for receiving a mobile phone (61) in a motor vehicle, comprising a metal structure (2, 3, 9) by means of which the mobile phone (61) can be coupled to a motor vehicle antenna (64) and a charging device (62, 68) by means of which the mobile phone (61) can be wirelessly charged, characterized by , that the metal structure (2, 3, 9) has a first metal structure element (2) and a second metal structure element (3), and that the two metal structure elements (2, 3) are interrupted or slotted in their aperture, so that the metal structure (2, 3, 9) having the two metal structure elements (2, 3) has a shielding effect, by means of which the radiation of energy components and harmonics that arise during the wireless charging of the mobile phone (61) by means of the charging device (62, 68) into the environment, in particular into other assemblies of the motor vehicle, can be reduced or avoided. [2] Receiving device according to claim 1, wherein the metal structure (2, 3, 9) includes a feed line (9) which has an inner conductor (23) and a shield conductor (24), wherein the inner conductor (23) is connected to the first metal structure element (2) and the shield conductor (24) is connected to the second metal structure element (3). [3] Receiving device according to claim 1 or 2, wherein the metal structure element (2) and the metal structure element (3) are each connected to a ground potential at at least one ground connection (21), preferably via a low-pass filter (22). [4] Receiving device according to claim 2 or 3, in which a metal structure element (3) of the metal structure (2, 3, 9) is penetrated by the inner conductor (23) of the feed line (9). [5] Receiving device according to one of claims 1 to 4, wherein the two metal structure elements (2, 3) of the metal structure (2, 3, 9) are designed to be similar in shape, contour and extent. [6] Receiving device according to one of claims 1 to 5, wherein the metal structure element (2) and / or the metal structure element (3) of the metal structure (2, 3, 9) is / are designed as a finger structure, preferably in a plane. [7] Receiving device according to claim 6, wherein the metal structure element (2) and the metal structure element (3) of the metal structure (2, 3, 9) each have a finger structure (27) in a plane A and a finger structure (28) in a plane B spaced apart from plane A. [8] Receiving device according to claim 7, in which one or each metal structure element (2, 3) has a base block (30, 31) via which the two finger structures (27, 28) of the first metal structure element (2) or of the second metal structure element (3) are connected to each other. [9] Recording device according to one of claims 2 to 8, wherein the metal structure (2, 3, 9) has a balun (29) by means of which asymmetrical high-frequency signals transported in the feed line (9) can be transformed into symmetrical high-frequency signals. [10] Receiving device according to one of claims 2 to 9, wherein the inner conductor (23) of the feed line (9) of the metal structure (2, 3, 9) widens smoothly and transitions into the first metal structure element (2) which has the finger structures (27, 28). [11] Recording device according to one of claims 2 to 10, wherein the feed line (9) between a mobile radio device connection point (10) and the two metal structure individual elements (2, 3) of the metal structure (2, 3, 9) has a high-pass signal transmission characteristic. [12] Recording device according to one of claims 3 to 11, in which a low-pass or band-pass characteristic is realized between the two metal structure individual elements (2, 3) of the metal structure (2, 3, 9) and the further ground connections (21). [13] Recording device according to one of claims 1 to 12, wherein the metal structure (2, 3, 9) is associated with an NFC (Nier Field Communication) antenna (41) which surrounds the metal structure (2, 3, 9) by means of planar windings. [14] Recording device according to one of claims 1 to 13, whose metal structure (2, 3, 9) is associated with capacitive touch sensor elements (51) which are arranged in metal structure-free areas near the metal structure (2, 3, 9) and by means of which an approach of the mobile phone (61) to the recording device can be detected. [15] Receiving device according to one of claims 1 to 14, the metal structure (2, 3, 9) of which is arranged on a support material (4). [16] Receiving device according to claim 15, wherein the finger structures (27) are arranged in plane A of the two metal structure elements (2, 3) on one side of the support material (4) and the finger structures (28) are arranged in plane B of the two structure elements (2, 3) on the other side of the support material (4). [17] Receiving device according to any one of claims 7 to 16, wherein the finger structures (27) in plane A are arranged offset from the finger structures (28) in plane B, such that the fingers of the finger structures (27) are associated with finger-free apertures of the finger structures (28) and finger-free apertures of the finger structures (27) are associated with fingers of the finger structures (28). [18] Receiving device according to one of claims 6 to 17, wherein the fingers of the finger structures (27, 28) of one metal structure single element (2) are arranged perpendicular to the fingers of the finger structures (27, 28) of the other metal structure single element (3). [19] Receiving device according to one of claims 6 to 18, in which the width of the fingers (27, 28) corresponds to the width of the apertures or slots formed between the fingers. [20] Receiving device according to one of claims 6 to 19, wherein the width of the apertures or slots of the finger structures (27, 28) of the metal structure individual elements (2, 3) is between 0.5 mm and 2.0 mm. [21] Method for operating a receiving device for receiving a mobile phone (61) in a motor vehicle according to one of claims 1 to 20, in which an approach of the mobile phone (61) to a metal structure (2, 3, 9) of the receiving device is detected, the mobile phone (61) communicates with a control electronics (66) of a charging electronics (65) and, when communication between the mobile phone (61) and the control electronics (66) is realized, the mobile phone (61) is wirelessly charged. [22] Method according to claim 21, wherein a mobile phone signal near-field coupling is realized between the recording device and the mobile phone (61) during the wireless charging of the mobile phone (61). [23] Method according to claim 21 or 22, wherein communication is carried out via the NFC antenna (41) during wireless charging of the mobile phone (61). [24] Method according to one of claims 21 to 23, wherein the capacitive touch sensor elements (51) are in operation during the wireless charging of the mobile phone (61).

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