Terminal device with NFC communication function

Abstract

The utility model provides terminal equipment with an NFC communication function. The terminal equipment comprises an NFC coil assembly, a first bearing structure and a second bearing structure, the NFC coil assembly comprises a metal coil and a magnetic part which are separately arranged; the first bearing structure and the second bearing structure are arranged at intervals along the thickness direction of the terminal equipment, the first bearing structure comprises a first bearing surface, and the metal coil is at least partially arranged on the first bearing surface; the second bearing structure comprises a second bearing surface, the magnetic part is at least partially arranged on the second bearing surface, the projection of the metal coil and the projection of the magnetic part on a preset plane at least partially coincide, and the preset plane is a plane perpendicular to the thickness direction of the terminal equipment; the first bearing surface is inclined or arc-shaped relative to the second bearing surface, or the first bearing surface is a step surface, so that the size of the terminal equipment in the thickness direction is reduced when the NFC communication performance is kept unchanged, or the NFC communication performance is improved when the size of the terminal equipment in the thickness direction is kept unchanged.

Description

Technical Field

[0001] The present application relates to the technical field of terminal devices, and in particular to a terminal device with NFC communication function. Background Art

[0002] At present, the thinning of terminal devices has become a trend, and more and more terminal devices are equipped with NFC (near field) communication functions. In the prior art, the metal coil and magnetic parts in the NFC component are usually integrated on the back shell of the terminal device, but at this time the thickness of the terminal device is equal to the sum of the thicknesses of the metal coil, the magnetic parts and other devices. Therefore, the installation of the NFC component will cause the thickness of the terminal device to increase, which is not conducive to the thinning of the terminal device.

[0003] In the prior art, some metal coils and magnetic parts in NFC components are arranged at the camera decorative ring of the back shell of the terminal device. However, due to the small space at the camera decorative ring, it is difficult to process and arrange the magnetic parts at the camera decorative ring, and the area of ​​the magnetic parts is easily insufficient, resulting in poor NFC communication performance. Some metal coils and magnetic parts in NFC components are integrally arranged on the motherboard or the middle frame. However, when the metal coil is close to the motherboard and the middle frame which are prone to eddy currents, the eddy currents will distort and interfere with the magnetic field generated by the metal coil, resulting in worse NFC communication performance of the terminal device. Therefore, how to improve the NFC communication performance of the terminal device needs to be studied and solved. Utility Model Content

[0004] To this end, the present application provides a terminal device with NFC communication function to solve the above technical problems.

[0005] The present application provides a terminal device with NFC communication function, the terminal device comprising an NFC coil assembly, a first bearing structure and a second bearing structure; the NFC coil assembly comprises a metal coil and a magnetic part, the metal coil and the magnetic part are separately arranged; the first bearing structure and the second bearing structure are arranged at intervals along the thickness direction of the terminal device, the first bearing structure comprises a first bearing surface, the metal coil is at least partially arranged on the first bearing surface of the first bearing structure; the second bearing structure comprises a second bearing surface, the magnetic part is at least partially arranged on the second bearing surface of the second bearing structure, and the projections of the metal coil and the magnetic part on a preset plane at least partially overlap, wherein the preset plane is a plane perpendicular to the thickness direction of the terminal device; the first bearing surface is inclined or arc-shaped relative to the second bearing surface, and / or the first bearing surface is an uneven surface.

[0006] In the present application, the metal coil and the magnetic component are arranged separately, which is conducive to improving the flexibility and structural stability of the NFC coil assembly in the terminal device. The metal coil is at least partially arranged on the first bearing surface of the first bearing structure, and the magnetic component is at least partially arranged on the second bearing surface of the second bearing structure. The second bearing structure and the first bearing structure are arranged at intervals along the thickness direction of the terminal device. When the first bearing surface is inclined or arc-shaped relative to the second bearing surface, and / or the first bearing surface is an uneven surface, it is conducive to reducing the size of the terminal device in the thickness direction while ensuring the NFC communication performance remains unchanged, or improving the NFC communication performance while keeping the size of the terminal device in the thickness direction unchanged.

[0007] In a possible implementation manner, the first bearing structure is a back shell, the back shell is made of insulating material, and the second bearing structure is a bearing plate having a metal layer.

[0008] When the metal coil is close to the supporting plate with a metal layer that is prone to eddy currents, the eddy currents will distort and interfere with the magnetic field generated by the metal coil, thereby affecting the NFC communication performance. The closer the magnetic part is to the supporting plate with a metal layer that is prone to eddy current effects, the better the eddy current suppression effect of the magnetic part. In the present application, the metal coil is at least partially arranged on the first supporting structure, and the first supporting structure is located on the back shell. Therefore, while ensuring that the size of the terminal device in the thickness direction remains unchanged, the distortion and interference of the magnetic field generated by the metal coil by the eddy current can be reduced or even avoided. The magnetic part is at least partially arranged on the second supporting structure, and the second supporting structure is the supporting plate with a metal layer. Therefore, while ensuring that the size of the terminal device in the thickness direction remains unchanged, the eddy current can be better suppressed, thereby improving the NFC communication performance of the terminal device.

[0009] In a possible embodiment, the back shell includes a back shell body and a protruding structure, wherein the protruding structure protrudes toward a side away from the supporting plate having the metal layer, and the protruding structure includes a peripheral portion, wherein the peripheral portion is connected to the back shell body, and the first supporting structure includes the peripheral portion of the protruding structure, and the first supporting surface includes an inner peripheral surface of the peripheral portion, wherein the inner peripheral surface is a surface of the peripheral portion facing the side of the supporting plate having the metal layer, and the inner peripheral surface is inclined or arc-shaped relative to the second supporting surface.

[0010] Therefore, when the metal coils are all arranged on the inner peripheral surface of the peripheral portion, since the inner peripheral surface is inclined or arc-shaped relative to the second bearing surface, the metal coil can be arranged in the space between the inner peripheral surface and the second bearing surface, thereby improving the NFC communication performance while keeping the size of the terminal device in the thickness direction unchanged. Alternatively, it is beneficial to reduce the size of the terminal device in the thickness direction while ensuring the NFC communication performance unchanged, that is, when the distance between the metal coil and the second bearing surface remains unchanged, the back shell can be closer to the bearing plate with the metal layer, so that the size of the terminal device in the thickness direction becomes thinner.

[0011] In a possible implementation, the raised structure is a camera decorative ring, and the inner peripheral surface of the peripheral portion includes a first curved surface and a second curved surface, the first curved surface is connected to the back shell body, and the curvature of the first curved surface is greater than the curvature of the second curved surface.

[0012] Since the first curved surface is connected to the back shell body, the space between the first curved surface and the back shell body is smaller than the space between the second curved surface and the back shell body. The curvature of the first curved surface is greater than the curvature of the second curved surface, which can increase the space between the first curved surface and the back shell body, thereby facilitating the space between the first curved surface and the back shell body and the space between the second curved surface and the back shell body to be close, which is beneficial for the camera decorative ring to have better structural strength, and the thickness of the metal coil can also be evenly set on the first curved surface and the second curved surface.

[0013] In one possible embodiment, the metal coils are all arranged on the inner peripheral surface of the peripheral portion; or at least a portion of the metal coils are arranged on the inner peripheral surface of the peripheral portion, and at least a portion of the metal coils are arranged on the inner surface of the back shell body, and the inner surface of the back shell body is the surface of the back shell body facing the side of the supporting plate having the metal layer.

[0014] Since the metal coil is further away from the carrier plate with a metal layer that is prone to eddy currents, the distortion and interference of the magnetic field generated by the metal coil by the eddy current effect can be reduced or even avoided, thereby improving the NFC communication performance of the terminal device. When the metal coils are all arranged on the inner peripheral surface of the peripheral portion, and the inner peripheral surface is inclined or arc-shaped relative to the second bearing surface, compared with the metal coil being arranged on the inner surface of the back shell body, it can be further away from the carrier plate with a metal layer that is prone to eddy currents, thereby improving the NFC communication performance of the terminal device while keeping the size of the terminal device in the thickness direction unchanged. Alternatively, the NFC communication performance can be kept unchanged while reducing the size of the terminal device in the thickness direction. When at least a portion of the metal coil is arranged on the inner peripheral surface of the peripheral portion, and a portion is arranged on the inner surface of the back shell body, and the inner peripheral surface is inclined or arc-shaped relative to the second bearing surface, at least a portion of the metal coil can be relatively further away from the bearing plate with the metal layer which is prone to eddy currents. In this way, while keeping the size of the terminal device in the thickness direction unchanged, the eddy current effect can reduce the distortion and interference of the magnetic field generated by the metal coil, thereby improving the NFC communication performance of the terminal device.

[0015] In a possible embodiment, the raised structure also includes a first planar portion, and the peripheral portion is connected between the back shell body and the first planar portion; the metal coils are all arranged on the inner peripheral surface of the peripheral portion; or, at least a portion of the metal coil is arranged on the inner peripheral surface of the peripheral portion, and at least a portion is arranged on the inner surface of the first planar portion of the raised structure, and the inner surface of the first planar portion is the surface of the first planar portion facing the side of the supporting plate having the metal layer; or, at least a portion of the metal coil is arranged on the inner peripheral surface of the peripheral portion, and at least a portion is arranged on the inner surface of the back shell body, and the inner surface of the back shell body is the surface of the back shell body facing the side of the supporting plate having the metal layer.

[0016] Since the metal coil is further away from the supporting plate with a metal layer that is prone to generating eddy currents, the distortion and interference of the magnetic field generated by the metal coil caused by the eddy current effect can be reduced or even avoided, thereby improving the NFC communication performance of the terminal device. When the metal coils are all arranged on the inner peripheral surface of the peripheral portion, or at least a portion of the metal coil is arranged on the inner peripheral surface of the peripheral portion, and at least a portion is arranged on the inner surface of the first planar portion of the protruding structure, and the inner peripheral surface is inclined or arc-shaped relative to the second supporting surface, compared with the metal coil being arranged on the back shell body, it can be further away from the supporting plate with a metal layer that is prone to generating eddy currents, thereby improving the NFC communication performance of the terminal device while keeping the size of the terminal device in the thickness direction unchanged; or, the NFC communication performance can be kept unchanged while reducing the size of the terminal device in the thickness direction. When at least a portion of the metal coil is arranged on the inner peripheral surface of the peripheral portion, and at least a portion is arranged on the inner surface of the back shell body, at least a portion of the metal coil can be relatively further away from the supporting plate with the metal layer which is prone to generate eddy currents, thereby reducing the distortion and interference of the magnetic field generated by the metal coil caused by the eddy current effect, thereby improving the NFC communication performance of the terminal device.

[0017] In a possible embodiment, the back shell body includes an edge portion, the edge portion has a curvature, the edge portion extends along the thickness direction of the terminal device, the first bearing structure also includes the edge portion, the first bearing surface also includes the inner surface of the edge portion, and the metal coil is at least partially arranged on the inner peripheral surface of the peripheral portion and the inner surface of the edge portion.

[0018] Since the edge portion extends along the thickness direction of the terminal device, when the metal coil is arranged on the third inner surface of the edge portion, the thickness of the terminal device will not be increased, which is beneficial to reducing the size of the terminal device with NFC communication function in the thickness direction; the inner peripheral surface of the peripheral portion is inclined or arc-shaped relative to the second bearing surface, so the metal coils are all arranged on the inner peripheral surface of the peripheral portion, which is beneficial to reducing the size of the terminal device with NFC communication function in the thickness direction while ensuring the NFC communication performance remains unchanged, or improving the NFC communication performance while ensuring the size of the terminal device in the thickness direction remains unchanged.

[0019] In a possible implementation, the metal coil includes a first metal trace and a second metal trace, the first metal trace is arranged on the inner peripheral surface of the peripheral portion, the second metal trace is arranged on the inner surface of the edge portion, and the first metal trace and the second metal trace are arranged adjacent to each other.

[0020] Since the distance between the components of the metal coil is too far apart, which may shorten the communication distance and increase the signal interference, the first metal wiring and the second metal wiring are arranged adjacent to each other, thereby ensuring a better NFC communication function.

[0021] In a possible implementation, the terminal device further includes a first feed source, a second feed source, and an isolation circuit, the isolation circuit being connected between the second metal routing and the first feed source and the second feed source, the first feed source being also connected to the first metal routing, the isolation circuit being used to isolate the feeding current signals provided by the first feed source and the second feed source, the first feed source being used to provide a first feeding current signal to excite the first metal routing and the second metal routing to resonate in the NFC frequency band; the second feed source being used to provide a second feeding current signal to excite the second metal routing to resonate in the cellular frequency band.

[0022] Thus, the implementation of the NFC communication function of the terminal device shares the second metal routing for implementing the cellular communication function, which is beneficial to saving the internal space of the terminal device. At the same time, since the cellular operating frequency is usually higher than the NFC operating frequency, when the second metal routing resonates in the NFC frequency band and the cellular frequency band at the same time, the communication signals will affect each other. Therefore, by setting the isolation circuit, the mutual influence between the cellular signal and the NFC signal can be reduced.

[0023] In a possible embodiment, the back shell body includes an edge portion, the edge portion has a curvature, the edge portion extends along the thickness direction of the terminal device, the first bearing structure includes the edge portion, the first bearing surface includes the inner surface of the edge portion, and the metal coil is at least partially arranged on the inner surface of the edge portion.

[0024] Since the edge portion extends along the thickness direction of the terminal device, when the metal coil is disposed on the inner surface of the edge portion, the thickness of the terminal device will not be increased, thereby facilitating the provision of a thinner terminal device.

[0025] In a possible embodiment, the terminal device also includes a back shell and a screen, and the first bearing structure is arranged in a cavity formed by the back shell and the screen; the back shell includes a second planar portion, the second bearing structure is the second planar portion, the second bearing surface includes the inner surface of the second planar portion, and the inner surface is the surface of the back shell facing the first bearing structure; the magnetic part includes a first magnetic part and a second magnetic part, and the first magnetic part is arranged on the inner surface of the second planar portion; the first bearing structure includes a first sub-bearing structure and a second sub-bearing structure, the first sub-bearing structure includes a first bearing sub-surface facing the back shell, the second sub-bearing structure includes a second bearing sub-surface facing the back shell, the first bearing sub-surface is closer to the inner surface of the second planar portion than the second bearing sub-surface, the first bearing surface includes the first bearing sub-surface and the second bearing sub-surface, the metal coil is arranged on the first bearing sub-surface, and the second magnetic part is arranged on the second bearing sub-surface.

[0026] Thus, for the NFC coil assembly in which the magnetic member includes a first magnetic member and a second magnetic member, the first magnetic member and the second magnetic member are separately arranged, and the metal coil is located between the first magnetic member and the second magnetic member, the first magnetic member is arranged on the inner surface of the back shell, the metal coil is arranged on the first bearing sub-surface of the first sub-bearing structure, and the second magnetic member is arranged on the second bearing sub-surface of the second sub-bearing structure. The first bearing surface includes the first bearing sub-surface and the second bearing sub-surface, and the second bearing sub-surface is closer to the bearing plate with a metal layer than the first bearing sub-surface, and the second magnetic member can better suppress the eddy current generated by the bearing plate with a metal layer, and reduce the distortion and interference caused by the eddy current to the magnetic field generated by the metal coil, thereby being more conducive to making the NFC communication performance of the terminal device better. In addition, the second bearing sub-surface is closer to the bearing plate with a metal layer than the first bearing sub-surface, the second bearing sub-surface is provided with the second magnetic member, the first bearing sub-surface is provided with the metal coil, and the metal coil is located between the first magnetic member and the second magnetic member. Therefore, the setting of the second magnetic member will not increase the thickness of the terminal device, which is conducive to the thinning of the terminal device.

[0027] In a possible implementation, the first sub-bearing structure is a metal shielding cover, the second sub-bearing structure is a mainboard, and the metal shielding cover is disposed on a side of the mainboard facing the back shell, wherein the metal shielding cover is used to shield electromagnetic interference.

[0028] The electric field generated by the portion of the metal coil located on the metal shielding cover when excited will further excite the metal shielding cover. This is a working characteristic of the NFC coil assembly in which the metal coil is located between the first magnetic component and the second magnetic component. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solution of the present application, the drawings required for use in the implementation manner will be briefly introduced below. Obviously, the drawings described below are some implementation manners of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0030] Figure 1 A schematic cross-sectional view of a first partial structure of a terminal device provided in some embodiments of the present application;

[0031] Figure 2 A schematic diagram of a structure of a single-turn metal coil single-ended feeding provided in some embodiments of the present application;

[0032] Figure 3 A schematic diagram of a structure of a single-turn metal coil double-end feeding provided in some embodiments of the present application;

[0033] Figure 4 A schematic diagram of a structure of a single-turn metal coil with double-end feeding provided in some other embodiments of the present application;

[0034] Figure 5 A schematic diagram of a structure of a multi-turn metal coil double-end feeding provided in some embodiments of the present application;

[0035] Figure 6 A schematic diagram of the structure of a terminal device provided in some embodiments of the present application;

[0036] Figure 7 A schematic diagram of a first structure of a metal coil provided in some embodiments of the present application projected onto a plane of a carrier plate;

[0037] Figure 8 A second structural schematic diagram of a metal coil provided in some embodiments of the present application projected onto the plane of a carrier plate;

[0038] Fig. 9 A schematic cross-sectional view of a second partial structure of a terminal device provided in some embodiments of the present application;

[0039] Fig.10 A third structural schematic diagram of a metal coil provided in some embodiments of the present application projected onto the plane of a carrier plate;

[0040] Fig.11A fourth structural schematic diagram of a metal coil provided in some embodiments of the present application projected onto the plane of a carrier plate;

[0041] Fig.12 A schematic cross-sectional view of a third partial structure of a terminal device provided in some embodiments of the present application;

[0042] Fig.13 A fifth structural schematic diagram of a metal coil provided in some embodiments of the present application projected onto a plane of a carrier plate;

[0043] Fig.14 A sixth structural schematic diagram of a metal coil provided in some embodiments of the present application projected onto a plane of a carrier plate;

[0044] Fig.15 A seventh structural schematic diagram of a metal coil provided in some embodiments of the present application projected onto a plane of a carrier plate;

[0045] Fig.16 An eighth structural schematic diagram of a metal coil provided in some embodiments of the present application projected onto a plane of a carrier plate;

[0046] Fig.17 A schematic cross-sectional view of a fourth partial structure of a terminal device provided in some embodiments of the present application;

[0047] Fig.18 A ninth structural schematic diagram of a metal coil provided in some embodiments of the present application projected onto a plane of a carrier plate;

[0048] Fig.19 A tenth structural schematic diagram of a metal coil provided in some embodiments of the present application projected onto a plane of a carrier plate;

[0049] Fig. 20 A schematic diagram of the structure of a back shell provided in some embodiments of the present application;

[0050] Fig.21 An eleventh structural schematic diagram of a metal coil provided in some embodiments of the present application projected onto a plane of a carrier plate;

[0051] Fig. 22 A twelfth structural schematic diagram of a metal coil provided in some embodiments of the present application projected onto a plane of a carrier plate;

[0052] Fig.23 A thirteenth structural schematic diagram of a metal coil provided in some embodiments of the present application projected onto a plane of a carrier plate;

[0053] Fig.24 A fourteenth structural schematic diagram of a metal coil provided in some embodiments of the present application projected onto a plane of a carrier plate;

[0054] Fig.25 A fifteenth structural schematic diagram of a metal coil provided in some embodiments of the present application projected onto a plane of a carrier plate;

[0055] Fig.26 A sixteenth structural schematic diagram of a metal coil provided in some embodiments of the present application projected onto a plane of a carrier plate;

[0056] Fig. 27 A seventeenth structural schematic diagram of a metal coil provided in some embodiments of the present application projected onto a plane of a carrier plate;

[0057] Fig.28 An eighteenth structural schematic diagram of a metal coil provided in some embodiments of the present application projected onto a plane of a carrier plate;

[0058] Fig.29 A nineteenth structural schematic diagram of a metal coil provided in some embodiments of the present application projected onto a plane of a carrier plate;

[0059] Fig.30 A twentieth structural schematic diagram of a metal coil provided in some embodiments of the present application projected onto a plane of a carrier plate;

[0060] Fig.31 A schematic diagram of the connection structure between the isolation circuit, the feed source and the metal wiring provided in some embodiments of the present application;

[0061] Fig.32 A twenty-first structural schematic diagram of a metal coil provided in some embodiments of the present application projected onto a plane of a carrier plate;

[0062] Fig.33 A schematic diagram of an NFC coil assembly provided in some embodiments of the present application being arranged in a terminal device;

[0063] Fig.34 A definition table of various states of terminal devices in some embodiments of the present application;

[0064] Fig.35 For Fig.34 The test result table of Q value in four states;

[0065] Fig.36 For Fig.34 The test results table of the longest card reading distance under four conditions;

[0066] Fig.37 For Fig.34 Table 2 shows the test results of communication freedom in four states. DETAILED DESCRIPTION

[0067] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0068] See also Figure 1 , Figure 1 A cross-sectional schematic diagram of a first partial structure of a terminal device provided in some embodiments of the present application.

[0069] like Figure 1 As shown, in some embodiments, a terminal device 100 with NFC communication function includes an NFC coil assembly 10, a first bearing structure 20 and a second bearing structure 30. The NFC coil assembly 10 includes a metal coil 11 and a magnetic member 12, and the metal coil 11 and the magnetic member 12 are separately arranged. The first bearing structure 20 and the second bearing structure 30 are arranged at intervals along the thickness direction D1 of the terminal device 100, the first bearing structure 20 includes a first bearing surface 201, and the metal coil 11 is at least partially arranged on the first bearing surface 201 of the first bearing structure 20; the second bearing structure 30 includes a second bearing surface 301, and the magnetic member 12 is at least partially arranged on the second bearing surface 301 of the second bearing structure 30, and the projections of the metal coil 11 and the magnetic member 12 on the preset plane at least partially overlap, wherein the preset plane is a plane perpendicular to the thickness direction D1 of the terminal device 100; the first bearing surface 201 is inclined or arc-shaped relative to the second bearing surface 301, and / or the first bearing surface 201 is an uneven surface.

[0070] In the present application, the metal coil 11 and the magnetic member 12 are separately arranged, which is conducive to improving the flexibility and structural stability of the NFC coil assembly 10 in the terminal device 100. The first bearing structure 20 and the second bearing structure 30 are arranged at intervals along the thickness direction D1 of the terminal device 100. The metal coil 11 is at least partially arranged on the first bearing surface 201 of the first bearing structure 20, and the magnetic member 12 is at least partially arranged on the second bearing surface 301 of the second bearing structure 30. The first bearing surface 201 is inclined or arc-shaped relative to the second bearing surface 301, and / or the first bearing surface 201 is an uneven surface, which is conducive to reducing the size of the terminal device 100 in the thickness direction D1 while ensuring the NFC communication performance remains unchanged, or improving the NFC communication performance while ensuring the size of the terminal device 100 in the thickness direction D1 remains unchanged.

[0071] The terminal device 100 may include a display screen (not shown in the figure), and the thickness direction D1 of the terminal device 100 may be a direction perpendicular to the surface of the display screen of the terminal device 100 .

[0072] The material of the magnetic component 12 may be, but is not limited to, any one or a combination of ferrite, nanocrystal, and composite resin magnetic materials.

[0073] The metal coil 11 may be disposed on a substrate of a FPC (Flexible Printed Circuit).

[0074] The terminal device 100 may be, but is not limited to, a mobile phone, a tablet, a computer, a smart home device, a wearable smart device, etc.

[0075] Among them, the first bearing surface 201 is inclined relative to the second bearing surface 301, which means that the first bearing surface 201 is inclined relative to the second bearing surface 301, and the first bearing surface 201 is a plane; the first bearing surface 201 is arc-shaped relative to the second bearing surface 301, which means that the first bearing surface 201 is an arc surface.

[0076] Among them, the metal coil 11 can be set on the first bearing surface 201 of the first bearing structure 20 by but not limited to mounting, LDS (Laser Direct Structuring), PDS (Plasma Direct Structuring), electroplating and other methods.

[0077] Among them, the at least partial overlap of the projections of the metal coil 11 and the magnetic part 12 on the preset plane includes partial overlap and complete overlap, and the complete overlap includes the situation that the projections of the metal coil 11 and the magnetic part 12 on the preset plane are equal in size and have the same area, and also includes the situation that the projection of the metal coil 11 on the preset plane is completely located within the projection of the magnetic part 12 on the preset plane.

[0078] In some embodiments, the projections of the metal coil 11 and the magnetic part 12 on a preset plane completely overlap, which can reduce signal interference and attenuation around the metal coil 11 and ensure maximum coupling efficiency between the metal coil 11 and the magnetic part 12, thereby improving the quality and stability of signal transmission during NFC communication of the terminal device 100.

[0079] In some embodiments, Figure 1As shown, the first supporting structure 20 is a back shell 40 , the back shell 40 is made of insulating material, and the second supporting structure 30 is a supporting plate 50 having a metal layer.

[0080] When the metal coil 11 is close to the carrier plate 50 with a metal layer that is prone to eddy currents, the eddy currents will cause distortion and interference to the magnetic field generated by the metal coil 11, thereby affecting the NFC communication performance. The closer the magnetic part 12 is to the carrier plate 50 with a metal layer that is prone to eddy currents, the better the eddy current suppression effect of the magnetic part 12, thereby improving the NFC communication performance. In the present application, the metal coil 11 is at least partially disposed on the first bearing structure 20, and the first bearing structure 20 is the back shell 40. Therefore, while ensuring that the size of the terminal device 100 in the thickness direction D1 remains unchanged, the distortion and interference caused by the eddy current to the magnetic field generated by the metal coil 11 can be reduced or even avoided. The magnetic part 12 is at least partially disposed on the second bearing structure 30, and the second bearing structure 30 is the carrier plate 50 with a metal layer. Therefore, while ensuring that the size of the terminal device 100 in the thickness direction D1 remains unchanged, the eddy current can be better suppressed, thereby improving the NFC communication performance of the terminal device.

[0081] The back shell 40 may be made of, but is not limited to, insulating materials such as glass, plastic, ceramic, and composite materials.

[0082] The carrier plate 50 with a metal layer may be, but is not limited to, a main board or a middle frame.

[0083] The carrier plate 50 with the metal layer generally includes metal conductors. When these metal conductors are in a changing electromagnetic field, eddy currents are generated. These eddy currents form a closed loop inside the metal conductor and generate their own magnetic field. This magnetic field distorts and interferes with the magnetic field generated by the metal coil 11, thereby affecting the normal operation of the NFC coil assembly 10.

[0084] When the magnetic member 12 is close to the conductor, it absorbs and redistributes magnetic energy, reduces the propagation and storage of the magnetic field in the conductor, and thus reduces the area of ​​the eddy current loop. Since the generation of eddy current is related to the loop area, the magnetic member 12 reduces the generation of eddy current by reducing the eddy current loop area.

[0085] In some embodiments, Figure 1As shown, the back shell 40 includes a back shell body 41 and a protruding structure 42, the protruding structure 42 protrudes toward a side away from the supporting plate 50 having a metal layer, the protruding structure 42 includes a peripheral portion 421, and the peripheral portion 421 is connected to the back shell body 41, the first supporting structure 20 includes the peripheral portion 421 of the protruding structure 42, the first supporting surface 201 includes an inner peripheral surface 4210 of the peripheral portion 421, the inner peripheral surface 4210 is a surface of the peripheral portion 421 facing the side of the supporting plate 50 having a metal layer, and the inner peripheral surface 4210 is inclined or arc-shaped relative to the second supporting surface 301.

[0086] Therefore, when the metal coils 11 are all arranged on the inner peripheral surface 4210 of the peripheral portion 421, since the inner peripheral surface 4210 is inclined or arc-shaped relative to the second bearing surface 301, the metal coil 11 can be arranged in the space between the inner peripheral surface 4210 and the second bearing surface 301, thereby improving the NFC communication performance while keeping the size of the terminal device 100 in the thickness direction D1 unchanged. Alternatively, it is beneficial to reduce the size of the terminal device 100 in the thickness direction D1 while ensuring the NFC communication performance unchanged, that is, when the distance between the metal coil 11 and the second bearing surface 301 remains unchanged, the back shell 40 can be closer to the bearing plate 50 with a metal layer, so that the size of the terminal device 100 in the thickness direction D1 becomes thinner.

[0087] Please refer to Figure 2-Figure 5 , Figure 2 A schematic diagram of a structure of a single-turn metal coil single-ended feeding provided in some embodiments of the present application; Figure 3 A schematic diagram of a structure of a single-turn metal coil double-end feeding provided in some embodiments of the present application; Figure 4 A schematic diagram of a structure of a single-turn metal coil with double-end feeding provided in some other embodiments of the present application; Figure 5 A schematic diagram of the structure of double-end feeding of a multi-turn metal coil provided in some embodiments of the present application.

[0088] In some embodiments, the number of turns of the metal coil 11 may be single turn or multiple turns, or may be partially single turn and partially multiple turns. The feeding mode of the metal coil 11 may be single-end feeding or double-end feeding, such as Figure 3 As shown, the metal coil 11 is a single turn, and is fed by a single-end feeding method, that is, one end of the metal coil 11 is a feeding end and is connected to a feeding source, and the other end is a grounding end. Figure 4 and Figure 5As shown, the metal coil 11 is a single turn, and the metal coil 11 is fed by double-end feeding, that is, both ends of the metal coil 11 are feeding ends connected to the feed source. It should be noted that when the double-end feeding method is adopted, Figure 5 As shown, the metal coil 11 can be directly grounded, such as Figure 4 As shown, the metal coil 11 may not be directly grounded. Figure 6 As shown, the metal coil 11 has multiple turns, and is fed by double-end feeding.

[0089] In some embodiments, Figure 1 As shown, the raised structure 42 is a camera decorative ring, and the inner peripheral surface 4210 of the peripheral portion 421 includes a first curved surface 4211 and a second curved surface 4212, the first curved surface 4211 is connected to the back shell body 41, and the curvature of the first curved surface 4211 is greater than the curvature of the second curved surface 4212.

[0090] Since the first curved surface 4211 is connected to the back shell body 41, the space between the first curved surface 4211 and the back shell body 41 is smaller than the space between the second curved surface 4212 and the back shell body 41. The curvature of the first curved surface 4211 is greater than the curvature of the second curved surface 4212, which can increase the space between the first curved surface 4211 and the back shell body 41, thereby facilitating the space size between the first curved surface 4211 and the back shell body 41 and the space size between the second curved surface 4212 and the back shell body 41 to be close, thereby facilitating the camera decorative ring to have better structural strength and also allowing the thickness of the metal coil 11 to be evenly arranged on the first curved surface 4211 and the second curved surface 4212.

[0091] In other embodiments, the curvature of the first curved surface 4211 may be equal to the curvature of the second curved surface 4212 , or the curvature of the first curved surface 4211 may be smaller than the curvature of the second curved surface 4212 .

[0092] See also Figure 6 , Figure 6 A schematic diagram of the structure of a terminal device provided for some embodiments of the present application.

[0093] Among them, Figure 6As shown, the protruding structure 42 may also be other structures protruding from the back shell body 41 toward a side away from the second bearing structure 30. For example, in some implementations, the terminal device 100 is a foldable terminal device, and the terminal device 100 includes a rotating shaft 60, a first body 61, and a second body 62, the first body 61 and the second body 62 are folded outward along the rotating shaft 60 (the screen is on the outside, and the back shell 40 is on the inside), the protruding structure 42 is arranged parallel to the rotating shaft 60, and in the folded state, the length of the second body 62 in the first direction D2 = the length of the first body 61 in the first direction D2 - the length of the protruding structure 42 in the first direction D2, wherein the first direction D2 is perpendicular to the extension direction of the rotating shaft 60.

[0094] See also Figure 7-Figure 11 , Figure 7 A schematic diagram of a first structure of a metal coil provided in some embodiments of the present application projected onto a plane of a carrier plate; Figure 8 A second structural schematic diagram of a metal coil provided in some embodiments of the present application projected onto the plane of a carrier plate; Fig. 9 A schematic cross-sectional view of a second partial structure of a terminal device provided in some embodiments of the present application; Fig.10 A third structural schematic diagram of a metal coil provided in some embodiments of the present application projected onto the plane of a carrier plate; Fig.11 A fourth structural schematic diagram of the metal coil provided in some embodiments of the present application projected onto the plane of the carrier plate.

[0095] In some embodiments, Figure 1 , Figure 7 and Figure 8 As shown, the metal coils 11 are all disposed on the inner peripheral surface 4210 of the peripheral portion 421. Or, as Figure 9-11 As shown, at least a portion of the metal coil 11 is arranged on the inner peripheral surface 4210 of the peripheral portion 421, and at least a portion is arranged on the first inner surface 410 of the back shell body 41. The first inner surface 410 of the back shell body 41 is the surface of the back shell body 41 facing the side of the supporting plate 50 having the metal layer.

[0096] Since the metal coil 11 is further away from the carrier plate 50 with a metal layer that is prone to eddy currents, the eddy current effect can reduce or even avoid distortion and interference of the magnetic field generated by the metal coil 11, thereby improving the NFC communication performance of the terminal device. When the metal coils 11 are all arranged on the inner peripheral surface 4210 of the peripheral portion 421, and the inner peripheral surface 4210 is inclined or arc-shaped relative to the second bearing surface 301, compared with the metal coils 11 being all arranged on the first inner surface 410 of the back shell body 41, it can be further away from the carrier plate 50 with a metal layer that is prone to eddy currents, thereby improving the NFC communication performance of the terminal device 100 while keeping the size of the terminal device 100 in the thickness direction D1 unchanged. Alternatively, the NFC communication performance can be kept unchanged while reducing the size of the terminal device 100 in the thickness direction D1. When at least a portion of the metal coil 11 is arranged on the inner peripheral surface 4210 of the peripheral portion 421, and a portion is arranged on the first inner surface 410 of the back shell body 41, and the inner peripheral surface is inclined or arc-shaped relative to the second bearing surface, at least a portion of the metal coil 11 can be relatively further away from the bearing plate 50 with a metal layer that is prone to eddy currents, thereby reducing the distortion and interference of the magnetic field generated by the metal coil 11 caused by the eddy current effect while keeping the size of the terminal device 100 in the thickness direction D1 unchanged, thereby improving the NFC communication performance of the terminal device 100.

[0097] The shape of the camera decorative ring projected onto the back shell body 41 may be, but is not limited to, a circle, an ellipse, a square, a rectangle, a polygon, and the like.

[0098] Please refer to Figure 12-Figure 19 ; Fig.12 A schematic cross-sectional view of a third partial structure of a terminal device provided in some embodiments of the present application; Fig.13 A fifth structural schematic diagram of a metal coil provided in some embodiments of the present application projected onto a plane of a carrier plate; Fig.14 A sixth structural schematic diagram of a metal coil provided in some embodiments of the present application projected onto a plane of a carrier plate; Fig.15 A seventh structural schematic diagram of a metal coil provided in some embodiments of the present application projected onto a plane of a carrier plate; Fig.16 An eighth structural schematic diagram of a metal coil provided in some embodiments of the present application projected onto a plane of a carrier plate; Fig.17 A schematic cross-sectional view of a fourth partial structure of a terminal device provided in some embodiments of the present application; Fig.18 A ninth structural schematic diagram of a metal coil provided in some embodiments of the present application projected onto a plane of a carrier plate; Fig.19The tenth structural schematic diagram of the metal coil provided in some embodiments of the present application projected onto the plane of the carrier plate.

[0099] In some embodiments, Figure 1 As shown, the protruding structure 42 further includes a first plane portion 422, and the peripheral portion 421 is connected between the back shell body 41 and the first plane portion 422. Figure 1 , Figure 7 as well as Figure 8 As shown, the metal coils 11 are all disposed on the inner peripheral surface 4210 of the peripheral portion 421. Or, as Figure 9-11 As shown, at least a portion of the metal coil 11 is disposed on the inner peripheral surface 4210 of the peripheral portion 421, and at least a portion of the metal coil 11 is disposed on the first inner surface 410 of the back shell body 41, and the first inner surface 410 of the back shell body 41 is the surface of the back shell body 41 facing the side of the carrier plate 50 having the metal layer. Or, as Figure 12-Figure 19 As shown, at least a portion of the metal coil 11 is arranged on the inner peripheral surface 4210 of the peripheral portion 421, and at least a portion is arranged on the second inner surface 4221 of the first planar portion 422 of the protruding structure 42, and the second inner surface 4221 of the first planar portion 422 is the surface of the first planar portion 422 facing the side of the supporting plate 50 having the metal layer.

[0100] Among them, Figure 12-16 As shown, the metal coil 11 is disposed on the inner peripheral surface 4210 of the peripheral portion 421 and the second inner surface 4221 of the first planar portion 422 of the protruding structure 42. Figure 17-Figure 19 As shown, the metal coil 11 is disposed on the inner peripheral surface 4210 of the peripheral portion 421 , the first inner surface 410 of the back shell body 41 , and the second inner surface 4221 of the first planar portion 422 of the protruding structure 42 .

[0101] Since the metal coil 11 is further away from the carrier plate 50 with a metal layer that is prone to generating eddy currents, the eddy current effect can reduce or even avoid distortion and interference of the magnetic field generated by the metal coil 11, thereby improving the NFC communication performance of the terminal device. When the metal coil 11 is arranged on the inner peripheral surface 4210 of the peripheral portion 421, or at least a portion of the metal coil 11 is arranged on the inner peripheral surface 4210 of the peripheral portion 421, and at least a portion of the metal coil 11 is arranged on the second inner surface 4221 of the first planar portion 422 of the protruding structure 42, and the inner peripheral surface 4210 is inclined or arc-shaped relative to the second bearing surface 301, compared with the metal coil 11 being arranged on the back shell body 41, the metal coil 11 can be further away from the bearing plate 50 with a metal layer that is prone to eddy currents, thereby improving the NFC communication performance of the terminal device 100 while keeping the size of the terminal device 100 in the thickness direction D1 unchanged; or, the NFC communication performance can be kept unchanged while reducing the size of the terminal device 100 in the thickness direction D1. When at least a portion of the metal coil 11 is arranged on the inner peripheral surface 4210 of the peripheral portion 421, and at least a portion is arranged on the first inner surface 410 of the back shell body 41, at least a portion of the metal coil 11 can be relatively further away from the supporting plate 50 with a metal layer which is prone to generate eddy currents, thereby reducing the distortion and interference of the magnetic field generated by the metal coil 11 caused by the eddy current effect, thereby improving the NFC communication performance of the terminal device 100.

[0102] Among them, the terminal device 100 also includes a feed source. When the metal coils 11 are all arranged on the inner peripheral surface 4210 of the peripheral portion 421, the feed source can be connected to any position of the metal coil 11 and provide a feeding current to the metal coil 11.

[0103] In which, when at least a portion of the metal coil 11 is arranged on the inner peripheral surface 4210 of the peripheral portion 421 and at least a portion is arranged on the first inner surface 410 of the back shell body 41, the feed source can be connected to any position of the metal coil 11 and provide feeding current to the metal coil 11.

[0104] In which, at least a portion of the metal coil 11 is arranged on the inner peripheral surface 4210 of the peripheral portion 421, and at least a portion is arranged on the second inner surface 4221 of the first planar portion 422 of the protruding structure 42. The feed source can be connected to any position of the metal coil 11 and provide feeding current to the metal coil 11.

[0105] See also Figure 20-Figure 30 , Fig. 20A schematic diagram of the structure of a back shell provided in some embodiments of the present application; Fig.21 An eleventh structural schematic diagram of a metal coil provided in some embodiments of the present application projected onto a plane of a carrier plate; Fig. 22 A twelfth structural schematic diagram of a metal coil provided in some embodiments of the present application projected onto a plane of a carrier plate; Fig.23 A thirteenth structural schematic diagram of a metal coil provided in some embodiments of the present application projected onto a plane of a carrier plate; Fig.24 A fourteenth structural schematic diagram of a metal coil provided in some embodiments of the present application projected onto a plane of a carrier plate; Fig.25 A fifteenth structural schematic diagram of a metal coil provided in some embodiments of the present application projected onto a plane of a carrier plate; Fig.26 A sixteenth structural schematic diagram of a metal coil provided in some embodiments of the present application projected onto a plane of a carrier plate; Fig. 27 A seventeenth structural schematic diagram of a metal coil provided in some embodiments of the present application projected onto a plane of a carrier plate; Fig.28 An eighteenth structural schematic diagram of a metal coil provided in some embodiments of the present application projected onto a plane of a carrier plate; Fig.29 A nineteenth structural schematic diagram of a metal coil provided in some embodiments of the present application projected onto a plane of a carrier plate; Fig.30 The twentieth structural schematic diagram of the metal coil provided in some embodiments of the present application projected onto the plane of the carrier plate.

[0106] In some embodiments, Fig. 20 As shown, the back shell body 41 includes an edge portion 412, the edge portion 412 has an arc, and the edge portion 412 extends along the thickness direction D1 of the terminal device 100. The first bearing structure 20 also includes the edge portion 412, and the first bearing surface 201 also includes a third inner surface 4120 of the edge portion 412. Figure 1 , Figure 20-Figure 30 As shown, the metal coil 11 is at least partially disposed on the inner peripheral surface 4210 of the peripheral portion 421 and the third inner surface 4120 of the edge portion 412 .

[0107] In some embodiments, the edge portion 412 of the back shell body 41 is disposed around the second plane portion 411 of the back shell body 41 , and the edge portion 412 and the second plane portion 411 are an integrated structure.

[0108] Since the edge portion 412 extends along the thickness direction D1 of the terminal device 100, when the metal coil 11 is arranged on the third inner surface 4120 of the edge portion 412, the thickness of the terminal device 100 will not be increased, which is beneficial to reducing the size of the terminal device 100 with NFC communication function in the thickness direction D1; the inner peripheral surface 4210 of the peripheral portion 421 is inclined or arc-shaped relative to the second bearing surface 301. Therefore, the metal coil 11 is arranged on the inner peripheral surface 4210 of the peripheral portion 421, which is beneficial to reducing the size of the terminal device 100 with NFC communication function in the thickness direction D1 while ensuring the NFC communication performance remains unchanged, or improving the NFC communication performance while ensuring the size of the terminal device 100 in the thickness direction D1 remains unchanged.

[0109] In some embodiments, Figure 1 , Figure 20-Figure 30 As shown, the metal coil 11 includes a first metal trace 111 and a second metal trace 112. The first metal trace 111 is arranged on the inner peripheral surface 4210 of the peripheral portion 421, and the second metal trace 112 is arranged on the third inner surface 4120 of the edge portion 412. The first metal trace 111 and the second metal trace 112 are arranged adjacent to each other.

[0110] Since the components of the metal coil 11 being too far apart may shorten the communication distance and increase signal interference, the first metal wiring 111 and the second metal wiring 112 are arranged adjacent to each other, thereby ensuring that the terminal device 100 has a better NFC communication function.

[0111] The second metal trace 112 may be a frame metal, and the second metal trace 112 may be grounded or not grounded.

[0112] In some embodiments, Figure 20-Figure 30 As shown, the first metal trace 111 is wound around the peripheral portion 421 half a circle, and the second metal trace 112 is arranged in the edge portion 412 area opposite to the first metal trace 111, and the second metal trace 112 and the first metal trace 111 can be connected through the metal trace in the PCB board, so that the second metal trace 112, the first metal trace 111 and the metal trace in the PCB board are connected in sequence to form a closed metal coil 11.

[0113] The second metal wiring 112 may be a continuous metal wiring or a plurality of disconnected metal wiring segments.

[0114] In some embodiments, the metal trace in the PCB board is perpendicular to the second metal trace 112. Since the farther the metal trace is from the PCB board, the middle frame and other metal parts that are prone to eddy current, the better the NFC communication performance, the metal trace in the PCB board is perpendicular to the second metal trace 112, so that the metal trace in the PCB board can be as short as possible, so that the metal coil 11 as a whole can be kept as far away from the PCB board as possible, thereby improving the NFC communication performance.

[0115] In some embodiments, Figure 20-Figure 29 As shown, it should be noted that the arrows in the figure represent the current flow direction and one of the flow paths on the metal coil 11 at a certain moment. In other embodiments, other flow paths can also be used. The terminal device 100 also includes a first spring clip A1, a second spring clip A2, a third spring clip A3, a fourth spring clip A4 and a circuit board (not marked), and a conductive member (not marked) is provided on the circuit board. The first feed source 71 is connected to the first spring clip A1 through the circuit board, and the first spring clip A1 is also connected to one end of the first metal trace 111, and the second spring clip A2 is connected to the other end of the first metal trace 111, and the second spring clip A2 is connected to the third spring clip A3 through the circuit board, and the third spring clip is also connected to one end of the second metal trace 112, and the fourth spring clip A4 is connected to the other end of the second metal trace 112, and the fourth spring clip A4 is connected to the first feed source 71 through the circuit board. After the first feed source 71 outputs the feed current, the feed current sequentially passes through the circuit board, the first spring piece A1, the first metal trace 111, the second spring piece A2, the circuit board, the third spring piece A3, the second metal trace 112, the fourth spring piece A4, the circuit board, and then returns to the first feed source 71. The first metal trace 111 and the second metal trace 112 are both a continuous metal trace.

[0116] In other embodiments, the second metal wiring 112 may also be a plurality of metal wirings arranged at intervals, such as Fig.30As shown, the second metal routing 112 includes a first sub-metal routing 1121 and a second sub-metal routing 1122, and the terminal device 100 includes a first spring clip A1, a second spring clip A2, a third spring clip A3, a fourth spring clip A4, a fifth spring clip A5, a sixth spring clip A6 and a circuit board, and a conductive member is arranged on the circuit board. The first feed source 71 is connected to the first spring clip A1 through the circuit board, the first spring clip A1 is also connected to one end of the first metal routing 111, the second spring clip A2 is connected to the other end of the first metal routing 111, the second spring clip A2 is connected to the third spring clip A3 through the circuit board, the third spring clip is also connected to one end of the first sub-metal routing 1121, the fourth spring clip A4 is connected to the other end of the first sub-metal routing 1121, the fourth spring clip A4 is connected to the fifth spring clip A5 through the circuit board, the fifth spring clip A5 is connected to one end of the second sub-metal routing 1122, the sixth spring clip A6 is connected to the other end of the second sub-metal routing 1122, and the sixth spring clip A6 is connected to the first feed source 71 through the circuit board. After the first feed source 71 outputs the feeding current, the feeding current passes through the circuit board, the first spring clip A1, the first metal trace 111, the second spring clip A2, the circuit board, the third spring clip A3, the first sub-metal trace 1121, the fourth spring clip A4, the circuit board, the fifth spring clip A5, the second sub-metal trace 1122, the sixth spring clip A6, the circuit board, and then returns to the first feed source 71.

[0117] Please refer to Fig.31 , Fig.31 A schematic diagram of the connection structure between the isolation circuit, the feed source and the metal routing provided in some embodiments of the present application.

[0118] In some embodiments, Fig.31 As shown, the terminal device 100 includes a first feed source 71, a second feed source 72 and an isolation circuit 73, the isolation circuit 73 is connected between the second metal trace 112 and the first feed source 71 and the second feed source 72, the first feed source 71 is also connected to the first metal trace 111, the isolation circuit 73 is used to isolate the feeding current signal provided by the first feed source 71 and the second feed source 72, the first feed source 71 is used to provide a first feeding current signal to excite the first metal trace 111 and the second metal trace 112 to resonate in the NFC frequency band; the second feed source 72 is used to provide a second feeding current signal to excite the second metal trace 112 to resonate in the cellular frequency band.

[0119] Among them, the NFC frequency band is 13.56MHz and the cellular frequency band is 850MHz-960 MHz.

[0120] Thus, the implementation of the NFC communication function of the terminal device 100 shares the second metal routing 112 for implementing the cellular communication function, which is beneficial to saving the internal space of the terminal device 100. At the same time, since the cellular operating frequency is usually higher than the NFC operating frequency, when the second metal routing 112 resonates in the NFC frequency band and the cellular frequency band at the same time, the communication signals will affect each other. Therefore, by setting the isolation circuit 73, the mutual influence between the cellular signal and the NFC signal can be reduced.

[0121] In some embodiments, Fig.31 As shown, the isolation circuit 73 includes an inductive circuit L and a capacitive circuit C, wherein the inductive circuit L can be composed of only inductance, or can be composed of capacitance, inductance, etc. but can be equivalent to an inductive circuit, and the inductive circuit L can be equivalent to an inductance between 22N and 68N. The capacitive circuit C can be composed of only capacitance, or can be composed of capacitance, inductance, etc. but can be equivalent to a capacitive circuit, and the capacitive circuit C can be equivalent to a capacitance between 33 and 100P. The capacitive circuit C allows cellular signals to pass through while blocking NFC signals from passing through; the inductive circuit L allows NFC signals to pass through while blocking cellular signals from passing through.

[0122] Please refer to Fig. 20 and Fig.32 , Fig.32 The twenty-first structural schematic diagram of the metal coil provided in some embodiments of the present application projected onto the plane of the carrier plate.

[0123] In some embodiments, Fig. 20 and Fig.32 As shown, the back shell body 41 includes an edge portion 412, the edge portion 412 has an arc, and the edge portion 412 extends along the thickness direction D1 of the terminal device 100. The first supporting structure 20 includes the edge portion 412, and the first supporting surface 201 includes a third inner surface 4120 of the edge portion 412. The metal coil 11 is at least partially arranged on the third inner surface 4120 of the edge portion 412.

[0124] Since the edge portion 412 extends along the thickness direction D1 of the terminal device 100 , when the metal coil 11 is disposed on the third inner surface 4120 of the edge portion 412 , the thickness of the terminal device 100 will not be increased, thereby facilitating a thinner terminal device 100 .

[0125] See also Fig.33 , Fig.33 This is a schematic diagram of an NFC coil assembly provided in some embodiments of the present application being disposed in a terminal device.

[0126] In some embodiments, Fig.33 As shown, the terminal device 100 also includes a back shell 40 and a screen 80, and the first bearing structure 20 is arranged in a cavity 81 formed by the back shell 40 and the screen 80; the back shell 40 includes a second planar portion 411, the second bearing structure 30 is the second planar portion 411, and the second bearing surface 301 includes a fourth inner surface 4110 of the second planar portion 411, and the fourth inner surface 4110 is the surface of the back shell 40 facing the first bearing structure 20. The magnetic member 12 includes a first magnetic member 121 and a second magnetic member 122, and the first magnetic member 121 is arranged on the fourth inner surface 4110 of the second planar portion 411; the first supporting structure 20 includes a first sub-supporting structure 21 and a second sub-supporting structure 22, the first sub-supporting structure 21 includes a first supporting sub-surface 210 facing the back shell 40, and the second sub-supporting structure 22 includes a second supporting sub-surface 220 facing the back shell 40, the first supporting sub-surface 210 is closer to the fourth inner surface 4110 of the second planar portion 411 than the second supporting sub-surface 220, the first supporting surface 201 includes the first supporting sub-surface 210 and the second supporting sub-surface 220, the metal coil 11 is arranged on the first supporting sub-surface 210, and the second magnetic member 122 is arranged on the second supporting sub-surface 220.

[0127] Thus, the magnetic member 12 includes a first magnetic member 121 and a second magnetic member 122, the first magnetic member 121 and the second magnetic member 122 are separately arranged, the metal coil 11 is located between the first magnetic member 121 and the second magnetic member 122, the first magnetic member 121 is arranged on the fourth inner surface 4110 of the second planar portion 411 of the back shell 40, the metal coil 11 is arranged on the first bearing sub-surface 210 of the first sub-bearing structure 21, and the second magnetic member 122 is arranged on the second sub-bearing structure 2 2, the first bearing surface 201 is an uneven surface, the first bearing surface 201 includes the first bearing surface 210 and the second bearing surface 220, the second bearing surface 220 is closer to the bearing plate 50 with a metal layer than the first bearing surface 210, the second magnetic member 122 can better suppress the eddy current generated by the bearing plate 50 with a metal layer, and reduce the distortion and interference caused by the eddy current to the magnetic field generated by the metal coil 11, thereby being more conducive to making the NFC communication performance of the terminal device 100 better. In addition, the second bearing surface 220 is closer to the bearing plate 50 with a metal layer than the first bearing surface 210, the second bearing surface 220 is provided with the second magnetic member 122, the first bearing surface 210 is provided with the metal coil 11, and the metal coil 11 is located between the first magnetic member 121 and the second magnetic member 122, therefore, the provision of the second magnetic member 122 will not increase the thickness of the terminal device 100, which is conducive to the thinning of the terminal device 100.

[0128] The back shell 40 includes a back shell body 41 and a protruding structure 42 . The protruding structure 42 includes a peripheral portion 421 and a first plane portion 422 . The back shell body 41 includes a second plane portion 411 . The peripheral portion 421 is connected between the second plane portion 411 and the first plane portion 422 .

[0129] The NFC coil assembly 10 in which the metal coil 11 is located between the first magnetic member 121 and the second magnetic member 122 may be a “ZB coil” or an “8-shaped coil”.

[0130] In some embodiments, the first sub-supporting structure 21 is a metal shielding cover, the second sub-supporting structure 22 is a mainboard, and the metal shielding cover is arranged on a side of the mainboard facing the back shell 40, wherein the metal shielding cover is used to shield electromagnetic interference.

[0131] Among them, the electric field generated by the part of the metal coil 11 located on the metal shielding cover when excited will further excite the metal shielding cover. This belongs to the working characteristic of the NFC coil component in which the metal coil is located between the first magnetic part and the second magnetic part. Therefore, what needs to be paid attention to is the influence of the eddy current generated by the mainboard on the metal coil 11, and the influence of the eddy current generated by the metal shielding cover on the metal coil 11 can be ignored.

[0132] Please refer to Figure 34-Figure 37 , Fig.34 A definition table of various states of terminal devices in some embodiments of the present application; Fig.35 For Fig.34 The test result table of Q value in four states; Fig.36 For Fig.34 The test results table of the longest card reading distance under four conditions; Fig.37 For Fig.34 Table 2 shows the test results of communication freedom in four states.

[0133] Regarding the proposed structure of this application, some relevant tests were conducted during the research and development stage. The structural principle of this application can be further clarified through the following test results. Fig.34 The performance of the NFC coil assembly under 4 different conditions is tested as shown in the table.

[0134] in, Fig.34 The table shown shows the definitions of four different states, namely, state 1, state 2, state 3 and state 4, where Fig.34 As shown, state 1 is that the distance between the lower surface of the magnetic part and the upper surface of the supporting plate is 0.433mm, and the distance between the upper surface of the magnetic part and the lower surface of the metal coil is 0.01mm; state 2 is that the distance between the lower surface of the magnetic part and the upper surface of the supporting plate is 0.433mm, and the distance between the upper surface of the magnetic part and the lower surface of the metal coil is 1.31mm; state 3 is that the distance between the lower surface of the magnetic part and the upper surface of the supporting plate is 0.433mm, and the distance between the upper surface of the magnetic part and the lower surface of the metal coil is 2.51mm; state 4 is that the distance between the lower surface of the magnetic part and the upper surface of the supporting plate is 1.733mm, and the distance between the upper surface of the magnetic part and the lower surface of the metal coil is 1.31mm.

[0135] like Fig.35 As shown in FIG. 1 , by comparing the test results of the Q value in state 1, state 2, and state 3, it can be seen that the Q value of the NFC coil assembly gradually increases in state 1, state 2, and state 3. Fig.34As shown, in state 1, state 2, and state 3, the distance between the lower surface of the magnetic part and the upper surface of the carrier plate is 0.433 mm, while the distance between the upper surface of the magnetic part and the lower surface of the metal coil gradually increases. It can be seen that the greater the distance between the upper surface of the magnetic part and the lower surface of the metal coil, the greater the Q value of the NFC coil assembly. It should be noted that the Q value represents the ratio of the inductance of the coil to the equivalent series resistance. The formula is: Q = 2πfL / Rs, f is the operating frequency, L is the self-inductance value of the coil, and Rs is the equivalent series resistance, including the DC resistance and other dissipation losses of the coil itself. Generally speaking, the higher the Q value, the smaller the energy loss of the coil and the better the quality factor. Therefore, when the relative distance between the magnetic part and the carrier plate is determined, the closer the metal coil is to the back shell of the terminal device, the smaller the energy loss of the NFC coil assembly. Comparing the test results of the Q values ​​of state 2 and state 4, it can be seen that the Q value of state 2 is larger than the Q value of state 4. As shown in FIG. Fig.34 As shown, in state 2 and state 4, the distance between the upper surface of the magnetic part and the lower surface of the metal coil is 1.31 mm, and the distance between the lower surface of the magnetic part and the upper surface of the carrier plate in state 2 is smaller than the distance between the lower surface of the magnetic part and the upper surface of the carrier plate in state 4. It can be seen that the smaller the distance between the lower surface of the magnetic part and the upper surface of the carrier plate, the greater the Q value of the NFC coil assembly. Therefore, when the relative distance between the magnetic part and the metal coil is determined, the closer the magnetic part is to the carrier plate, the smaller the energy loss of the NFC coil assembly. The Q value trend is: state 3>state 2>state 4>state 1.

[0136] like Fig.36 As shown in FIG. 1 , from the test table of the maximum card reading distance of the two magnetic cards, ID card and TV (TrafficViolator card, traffic card), it can be seen that in state 1, state 2 and state 3, the maximum card reading distance of the two magnetic cards gradually increases. Fig.34 As shown, in state 1, state 2, and state 3, the distance between the lower surface of the magnetic part and the upper surface of the carrier plate is 0.433 mm, while the distance between the upper surface of the magnetic part and the lower surface of the metal coil gradually increases. It can be seen that the greater the distance between the upper surface of the magnetic part and the lower surface of the metal coil, the greater the maximum card reading distance of the magnetic card. Comparing the test results of the maximum card reading distance of the magnetic card in state 2 and state 4, it can be seen that the maximum card reading distance between the ID card and the TV magnetic card in state 2 is greater than that in state 4, among which, due to Fig.34 As shown, in state 2 and state 4, the distance between the upper surface of the magnetic part and the lower surface of the metal coil is 1.31 mm. The distance between the lower surface of the magnetic part and the upper surface of the carrier plate in state 2 is smaller than the distance between the lower surface of the magnetic part and the upper surface of the carrier plate in state 4. Therefore, the smaller the distance between the lower surface of the magnetic part and the upper surface of the carrier plate, the greater the maximum card reading distance of the magnetic card. The trend of the maximum card reading distance for ID cards and TV magnetic cards is: state 3>state 2>state 4>state 1.

[0137] like Fig.37 As shown in the table, from the test table of the communication freedom between the ID card and TAGV (Tag-Antag-Verifier, wireless radio frequency reading tag), it can be seen that in state 1, state 2 and state 3, the communication freedom between the ID card and TAGV gradually increases. Fig.34 As shown, in state 1, state 2 and state 3, the distance between the lower surface of the magnetic part and the upper surface of the carrier plate is 0.433mm, while the distance between the upper surface of the magnetic part and the lower surface of the metal coil gradually increases. It can be seen that the greater the distance between the upper surface of the magnetic part and the lower surface of the metal coil, the greater the communication freedom of the magnetic card. Comparing the test table of the communication freedom of the magnetic card in state 2 and state 4, it can be seen that the communication freedom between the ID card and TAGV in state 2 is greater than that in state 4, among which, due to Fig.34 As shown, in state 2 and state 4, the distance between the upper surface of the magnetic part and the lower surface of the metal coil is 1.31 mm. The distance between the lower surface of the magnetic part and the upper surface of the carrier plate in state 2 is smaller than the distance between the lower surface of the magnetic part and the upper surface of the carrier plate in state 4. Therefore, the smaller the distance between the lower surface of the magnetic part and the upper surface of the carrier plate, the greater the communication freedom of the magnetic card. The communication freedom trends of the ID card and TAGV are: state 3>state 2>state 4>state 1.

[0138] Therefore, according to the above tests, the closer the metal coil is to the back shell of the terminal device, the smaller the distance between the lower surface of the magnetic part and the upper surface of the carrier plate, the smaller the energy loss of the NFC coil assembly, the longer the maximum card reading distance, and the higher the communication freedom.

[0139] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0140] In the description of this application, unless otherwise clearly specified and limited, the term "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, an indirect connection through an intermediate medium, or the internal connection of two components; it can be a communication connection; it can be an electrical connection. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0141] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The presentation of the phrase at various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0142] The above is an implementation method of the embodiment of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the embodiment of the present application. These improvements and modifications are also considered to be within the scope of protection of the present application.

Claims

1. A terminal device with NFC communication function, characterized in that: The terminal device comprises: An NFC coil assembly, comprising a metal coil and a magnetic member, wherein the metal coil and the magnetic member are separately arranged; A first bearing structure, comprising a first bearing surface, wherein the metal coil is at least partially disposed on the first bearing surface of the first bearing structure; A second supporting structure is arranged at intervals with the first supporting structure along the thickness direction of the terminal device, the second supporting structure includes a second supporting surface, the magnetic component is at least partially arranged on the second supporting surface of the second supporting structure, and the metal coil and the projection of the magnetic component on a preset plane at least partially overlap, wherein the preset plane is a plane perpendicular to the thickness direction of the terminal device, wherein the first supporting surface is inclined or arc-shaped relative to the second supporting surface, and / or the first supporting surface is an uneven surface.

2. The terminal device with NFC communication function according to claim 1, characterized in that: The first bearing structure is a back shell, the back shell is made of insulating material, and the second bearing structure is a bearing plate with a metal layer.

3. The terminal device with NFC communication function according to claim 2, characterized in that: The back shell includes a back shell body and a protruding structure, wherein the protruding structure protrudes toward a side away from the supporting plate having a metal layer, and the protruding structure includes a peripheral portion, wherein the peripheral portion is connected to the back shell body, and the first supporting structure includes the peripheral portion of the protruding structure, and the first supporting surface includes an inner peripheral surface of the peripheral portion, wherein the inner peripheral surface is a surface of the peripheral portion facing the side of the supporting plate having a metal layer, and the inner peripheral surface is inclined or arc-shaped relative to the second supporting surface.

4. The terminal device with NFC communication function according to claim 3, characterized in that: The raised structure is a camera decorative ring, and the inner peripheral surface of the peripheral portion includes a first curved surface and a second curved surface, the first curved surface is connected to the back shell body, and the curvature of the first curved surface is greater than the curvature of the second curved surface.

5. The terminal device with NFC communication function according to claim 3, characterized in that: The metal coils are all arranged on the inner peripheral surface of the peripheral portion; or At least a portion of the metal coil is disposed on the inner peripheral surface of the peripheral portion, and at least a portion of the metal coil is disposed on the inner surface of the back shell body, and the inner surface of the back shell body is the surface of the back shell body facing the side of the supporting plate having the metal layer.

6. The terminal device with NFC communication function according to claim 3, characterized in that: The protruding structure further includes a first plane portion, and the peripheral portion is connected between the back shell body and the first plane portion; The metal coils are all arranged on the inner peripheral surface of the peripheral portion; or The metal coil is at least partially disposed on the inner peripheral surface of the peripheral portion, and at least partially disposed on the inner surface of the first planar portion of the protruding structure, wherein the inner surface of the first planar portion is a surface of the first planar portion facing the side of the carrier plate having the metal layer; or At least a portion of the metal coil is disposed on the inner peripheral surface of the peripheral portion, and at least a portion of the metal coil is disposed on the inner surface of the back shell body, and the inner surface of the back shell body is the surface of the back shell body facing the side of the supporting plate having the metal layer.

7. The terminal device with NFC communication function according to claim 3, characterized in that: The back shell body includes an edge portion, the edge portion has a curvature, and the edge portion extends along the thickness direction of the terminal device. The first supporting structure also includes the edge portion, and the first supporting surface also includes the inner surface of the edge portion. The metal coil is at least partially arranged on the inner peripheral surface of the peripheral portion and the inner surface of the edge portion.

8. The terminal device with NFC communication function according to claim 7, characterized in that: The metal coil includes a first metal routing and a second metal routing, wherein the first metal routing is arranged on the inner peripheral surface of the peripheral portion, and the second metal routing is arranged on the inner surface of the edge portion, and the first metal routing and the second metal routing are arranged adjacent to each other.

9. The terminal device with NFC communication function according to claim 8, characterized in that: The terminal device also includes a first feed source, a second feed source and an isolation circuit, the isolation circuit is connected between the second metal routing and the first feed source and the second feed source, the first feed source is also connected to the first metal routing, the isolation circuit is used to isolate the feeding current signals provided by the first feed source and the second feed source, the first feed source is used to provide a first feeding current signal to excite the first metal routing and the second metal routing to resonate in the NFC frequency band; the second feed source is used to provide a second feeding current signal to excite the second metal routing to resonate in the cellular frequency band.

10. The terminal device with NFC communication function according to claim 3, characterized in that: The back shell body includes an edge portion, the edge portion has a curvature, and the edge portion extends along the thickness direction of the terminal device. The first bearing structure includes the edge portion, the first bearing surface includes the inner surface of the edge portion, and the metal coil is at least partially arranged on the inner surface of the edge portion.

11. The terminal device with NFC communication function according to claim 1, characterized in that: The terminal device further includes a back shell and a screen, the first bearing structure is arranged in a cavity formed by the back shell and the screen; the back shell includes a second plane portion, the second bearing structure is the second plane portion, the second bearing surface includes an inner surface of the second plane portion, and the inner surface is a surface of the back shell facing the first bearing structure; The magnetic member includes a first magnetic member and a second magnetic member, wherein the first magnetic member is disposed on the inner surface of the second planar portion; The first bearing structure includes a first sub-bearing structure and a second sub-bearing structure, the first sub-bearing structure includes a first bearing sub-surface facing the back shell, the second sub-bearing structure includes a second bearing sub-surface facing the back shell, the first bearing sub-surface is closer to the inner surface of the second planar portion than the second bearing sub-surface, the first bearing surface includes the first bearing sub-surface and the second bearing sub-surface, the metal coil is arranged on the first bearing sub-surface, and the second magnetic member is arranged on the second bearing sub-surface.

12. The terminal device with NFC communication function according to claim 11, characterized in that: The first sub-bearing structure is a metal shielding cover, the second sub-bearing structure is a mainboard, the metal shielding cover is arranged on a side of the mainboard facing the back shell, wherein the metal shielding cover is used to shield electromagnetic interference.

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