Housing assembly and foldable terminal

Abstract

The present application provides a housing assembly and a foldable terminal. The housing assembly is applied to the foldable terminal, the foldable terminal has an unfolded state and a folded state, the foldable terminal comprises a plurality of folding portions rotatably and sequentially connected by means of a rotary shaft, at least one folding portion is provided with the housing assembly, at least part of the housing assembly is a coupling medium, the coupling medium is used for electromagnetically coupling with another folding portion, which is opposingly arranged, and / or the rotary shaft in the folded state, and the coupling medium is electrically connected to a grounding structure of the folding portion. The housing assembly is provided with a first edge portion, a second edge portion, and a third edge portion which are sequentially connected, the first edge portion and the third edge portion are located on a same side of the second edge portion, the coupling medium is provided with a first portion located at the first edge portion, a second portion located at the second edge portion, and a third portion located at the third edge portion. The housing assembly and the foldable terminal provided in the embodiments of the present application can reduce the risk of antenna isolation deterioration.

Description

Shell assembly and foldable terminal

[0001] The present application claims priority to the Chinese patent application No. 202410835300.5, filed on June 25, 2024, and entitled "Shell assembly and foldable terminal", the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0002] The present application relates to the field of electronic devices, and in particular to a shell assembly and a foldable terminal. BACKGROUND

[0003] In recent years, foldable terminals are increasingly widely used. A foldable terminal generally includes multiple folding parts that are rotationally connected by a hinge. Since the hinge generally needs to have certain durability and stability, etc., the hinge is mostly made of metal material at least in part. The metal components in the hinge and the metal components in the folding parts can form a complex electromagnetic environment, resulting in poor isolation of the antenna on the foldable terminal, thereby affecting the radiation and reception performance of the antenna. SUMMARY

[0004] The present application provides a shell assembly and a foldable terminal, which improves the problem of poor isolation of the antenna.

[0005] To achieve the above-mentioned purpose, the present application adopts the following technical solutions:

[0006] In a first aspect, a shell assembly is provided for a foldable terminal. The foldable terminal has an unfolded state and a folded state. The foldable terminal includes multiple folding parts rotationally connected in sequence by a hinge, and at least one folding part has a shell assembly. At least part of the shell assembly is a coupling medium, the coupling medium is configured to be electromagnetically coupled with another folding part and / or the hinge in the folded state, and the coupling medium is electrically connected with a grounding structure of the folding part.

[0007] The shell assembly provided by the present application has a coupling medium arranged thereon, which can form electromagnetic coupling with another folding part and / or the hinge in the folded state, thereby blocking external electromagnetic waves from entering the cavity formed by the foldable terminal, i.e., the influence of the cavity film on the antenna can be isolated, a closed cavity structure is formed, external electromagnetic waves are blocked outside the main display screen, and thus the occurrence probability of the problem of poor antenna isolation caused by the entry of external electromagnetic waves can be reduced, and the use performance of the foldable terminal can be improved to some extent. The coupling medium is connected with the grounding structure, which can provide a low-impedance path for external electromagnetic waves entering the shell assembly, so that the external electromagnetic waves can be more easily absorbed or reflected back to the source, rather than propagating through the gap.

[0008] In some embodiments, the shell assembly has a first edge portion, a second edge portion and a third edge portion connected in sequence, the first edge portion and the third edge portion are located on the same side of the second edge portion, the coupling medium has a first portion located on the first edge portion, a second portion located on the second edge portion and a third portion located on the third edge portion, and the first portion and the third portion are connected through the second portion. In this embodiment, the shell assembly is generally located on the edge folding portion of the foldable terminal having three or more folding portions, or is located on any folding portion of the foldable terminal having two folding portions. The coupling medium is composed of three portions, which can cover a larger area of the shell assembly, so that the volume of the coupling medium is larger, the electromagnetic coupling area with another folding portion is larger, and thus the external electromagnetic wave can be blocked into the cavity of the foldable terminal as much as possible.

[0009] In some embodiments, the length of the first portion is less than the length of the first edge portion, and the length of the third portion is less than the length of the third edge portion. In this way, compared with arranging the coupling medium on all regions of the first edge portion and the third edge portion, the volume of the coupling medium and the amount of required material can be reduced, and the manufacturing cost of the shell assembly and the foldable terminal can be reduced, while the coupling medium can also block the external electromagnetic wave from entering the cavity of the foldable terminal through the above-mentioned port, so that the performance of the foldable terminal is good.

[0010] In some embodiments, the shell assembly further comprises an insulating portion having a first surface facing another folding portion and a second surface opposite to the first surface. The coupling medium comprises a metal layer, at least a part of the metal layer is arranged on the first surface, and the metal layer is electrically connected with the grounding structure. In this way, the metal layer can be prepared on the insulating portion by electroplating, so that a smaller amount of coupling medium can cover a larger surface area of the shell assembly, that is, while ensuring a larger coupling area between the coupling medium and another folding portion, a smaller amount of material is used for the coupling medium, so that the performance of the foldable terminal is good while the manufacturing cost is low.

[0011] In some embodiments, the first surface comprises a flat surface and a curved surface connected in sequence in the first direction, a part of the metal layer is located on the flat surface, and another part extends to the curved surface. In this way, the metal layer can cover a larger area, so that the coupling area between the coupling medium and another folding portion is larger, and the external electromagnetic wave can be blocked into the cavity of the foldable terminal as much as possible.

[0012] In some embodiments, the part of the metal layer located on the curved surface has a dimension in the first direction greater than or equal to 1mm. In this way, the metal layer can cover a larger curved surface, so that the coverage area of the metal layer is large enough, and a larger coupling area can be formed with another folding portion to meet the use requirements.

[0013] In some embodiments, the thickness of the metal layer is greater than or equal to 5 microns. In this way, the electromagnetic coupling phenomenon between the metal layer and another folding part is obvious, and the effect of blocking the entry of electromagnetic waves can be achieved.

[0014] In some embodiments, the thickness of the metal layer is 5 microns to 10 microns. In this way, the shell assembly can block the entry of external electromagnetic waves while having a small thickness, so that the appearance of the foldable terminal is beautiful.

[0015] In some embodiments, the thickness of the metal layer is 5 microns to 20 microns. In this way, the shell assembly can block the entry of external electromagnetic waves while having a small thickness, so that the appearance of the foldable terminal is beautiful.

[0016] In some embodiments, the metal layer is entirely disposed on the first surface of the insulating part. In this way, the metal layer requires less material, has a large manufacturing cost, and is easy to popularize.

[0017] In some embodiments, the metal layer has a first layer body and a second layer body connected to each other. The first layer body is disposed on the first surface. The second layer body is disposed on the second surface of the insulating part. At least one of the second layer body and the first layer body is electrically connected to the grounding structure. In this way, the connection between the grounding structure and the metal layer is facilitated.

[0018] In some embodiments, the shell assembly further includes a first connecting piece embedded in the insulating part, and the first connecting piece is electrically connected to the metal layer. The first connecting piece is used to be electrically connected to the grounding structure. The first connecting piece can be a sheet, a metal block, a wire, etc., and the specific form can be determined according to the use requirement. In this way, the connection stability between the grounding structure and the metal layer can be improved to a certain extent.

[0019] In some embodiments, the first connecting piece includes a first connecting part, a second connecting part, and a third connecting part connected in sequence. The first connecting part is in surface contact with the part of the metal layer located on the first surface. The third connecting part is used to be in surface contact with the part of the metal layer located on the second surface or the grounding structure. In this way, the connection area between the first connecting piece and the metal layer and the grounding structure is large, and the connection stability between the first connecting piece and the metal layer and the grounding structure can be ensured to a certain extent.

[0020] In some embodiments, the first connecting piece is bent from a sheet. In this way, the connection between the parts of the first connecting piece is stable, and the first connecting piece is easy to manufacture.

[0021] In some embodiments, the metal layer comprises a first nickel layer, a copper layer and a second nickel layer stacked in sequence along the thickness direction of the metal layer. The copper layer is mainly used for electromagnetic coupling with another folding part, the first nickel layer can be directly arranged on the surface of the insulating part to provide an attachment platform for the copper layer, and the second nickel layer is arranged to protect the copper layer and facilitate the surface treatment of the second nickel layer by the designer to meet the aesthetic and other use requirements of the shell assembly.

[0022] In some embodiments, the coupling medium comprises a metal part. The shell assembly further comprises an insulating part arranged on the side of the metal part away from the main display screen of the foldable terminal and connected with the metal part. The coupling medium provided in the embodiments can be prepared by assembling the metal part and the insulating part prepared separately, which is convenient for preparation and helps to improve the preparation efficiency.

[0023] In some embodiments, at least part of the metal part and at least part of the insulating part are overlapped in the thickness direction of the shell assembly and connected by a glue layer. The metal part and the insulating part are bonded by the glue layer, which is convenient to obtain materials and easy to operate.

[0024] In some embodiments, the metal part has a first plug-in part, the insulating part has a second plug-in part matched with the first plug-in part, and the insulating part is plugged with the metal part through the second plug-in part and the first plug-in part. The metal part and the insulating part are connected in the manner provided in the embodiments, which can be prepared by first preparing the metal part, then placing the metal part in an injection molding tool, and injecting the insulating part on one side of the metal part. In this way, the contact area between the insulating part and the metal part is large, and the connection between them is stable and not easy to separate. At the same time, the combined structure of the insulating part and the metal part has high strength.

[0025] In a second aspect, a foldable terminal is provided. The foldable terminal has an unfolded state and a folded state, and in the folded state, the inner surface of the foldable terminal encloses at least one cavity. The foldable terminal comprises a first folding part and a second folding part, and the first folding part and the second folding part both have a grounding structure. In the folded state, the second folding part is arranged opposite to the first folding part, and one of the first folding part and the second folding part has a flexible display screen and a shell assembly provided by any of the above-mentioned solutions on the side facing the other folding part. The shell assembly surrounds the flexible display screen. The shell assembly on one folding part and the other folding part form an opening for communication between the cavity and the external space. That is, at least part of the shell assembly is a coupling medium for electromagnetic coupling with the other folding part arranged opposite in the folded state. The arrangement and working principle of the coupling medium are consistent with the foregoing, which will not be repeated here.

[0026] In some embodiments, in the width direction of the opening, the width of the coupling medium is substantially equal to the width of the opening. In this way, in the width direction of the opening, the width of the coupling region of the first folding part and the second folding part can be substantially equal to the width of the opening, so that most of the electromagnetic waves can be blocked from entering the cavity of the foldable terminal through the coupling region, so that the isolation of the antenna of the foldable terminal is not easily affected by external electromagnetic waves, and the use effect is ensured.

[0027] In some embodiments, the coupling medium is electrically connected to the grounding structure on the folding part through a connecting assembly. The connecting assembly can include a wire, a flexible circuit board or other electrical connecting member, so that the arrangement of the grounding structure and the coupling medium is not affected by each other, facilitating preparation and connection.

[0028] In some embodiments, the connecting assembly includes a flexible circuit board, the flexible circuit board is arranged on the inner side of the coupling medium, and the flexible circuit board is electrically connected to the coupling medium and the grounding structure. The connecting assembly provided in the embodiment has a simple structure and is easy to assemble.

[0029] In some embodiments, the flexible circuit board is electrically connected to the coupling medium through an elastic member. The elastic member can be a spring, or can include a spring and other structures, such as a spring and a rigid member, which can be determined according to the use requirement. The elastic member in the embodiment can be the first connecting member, or can be other elastic members other than the first connecting member. The arrangement of the elastic member can realize the elastic contact between the flexible circuit board and the coupling medium, so that the two are stably connected, so that the coupling medium is not easily separated from the coupling medium when the foldable terminal shakes, vibrates and the like, so that the grounding effect of the coupling medium is good.

[0030] In some embodiments, the connecting assembly further includes a second connecting member connecting the flexible circuit board and the grounding structure. Compared with direct welding of the flexible circuit board and the grounding structure, the second connecting member can provide more flexibility and fault tolerance for welding. When the second connecting piece is a copper sheet, the copper sheet has better electrical conductivity and thermal conductivity, and its mechanical strength is also higher, so that the connection structure between the flexible circuit board and the grounding structure can withstand greater stress and vibration, which can improve the reliability of the welding to a certain extent, and improve the heat dissipation performance of the connection structure to a certain extent, reducing the risk of damage of the connection structure due to overheating.

[0031] In some embodiments, the folding part comprises a middle frame, the middle frame comprises a first frame body, a second frame body and a third frame body arranged in sequence. The first frame body has a grounding structure. The second frame body is an insulating frame body, and the second frame body is arranged around the first frame body. The third frame body is arranged around the second frame body, and the third frame body is provided with an antenna. A part of the flexible circuit board is arranged on the second frame body and / or the third frame body, and another part of the flexible circuit board is electrically connected with the grounding structure. The middle frame adopts the structure provided in the embodiments, so that the first frame body with the grounding structure and the third frame body with the antenna can be separated by the insulating frame body (i.e. the second frame body), so that the antenna is not easily affected by the conductive structure on the first frame body, and the performance of the antenna is stable. A part of the flexible circuit board is arranged on the second frame body and / or the third frame body, and another part of the flexible circuit board is electrically connected with the grounding structure, so that at least part of the flexible circuit board is located outside the first frame body, so that the flexible circuit board is not easily affected by other conductive structures on the first frame body except the grounding structure, and the structure and electrical performance of the folding part are stable.

[0032] In some embodiments, the foldable terminal further comprises a limiting structure, the limiting structure comprises a first limiting part and a second limiting part matched with the first limiting part. The first limiting part is arranged on the flexible circuit board, and the second limiting part is arranged on the second frame body and / or the third frame body. The flexible circuit board is mounted on a preset area of the second frame body and / or the third frame body through the second limiting part and the first limiting part. The arrangement of the first limiting part and the second limiting part can enable the flexible circuit board to be mounted in the preset area of the second frame body, so that the assembly position of the flexible circuit board is accurate, and the assembly consistency of different products is good.

[0033] In some embodiments, the first limiting part comprises a protruding part protruding from the flexible circuit board, and the second limiting part comprises a groove arranged on the second frame body and / or the third frame body. The protruding part and the groove are inserted and matched. The protruding part can be a protruding edge, a protruding piece, a protruding block, etc. The specific form can be determined according to the shape and depth of the groove and the mounting needs of the flexible circuit board, etc. The first limiting part and the second limiting part adopt the structure provided in the embodiments, which is simple in structure and convenient to assemble. Meanwhile, the first limiting part comprises the protruding part, which is used as a limiting structure and also as a reinforcing structure of the flexible circuit board. In this way, the mechanical strength of the flexible circuit board can be enhanced, and the risk of damage of the flexible circuit board can be reduced.

[0034] In some embodiments, the protruding part comprises a strip-shaped part, and the length direction of the strip-shaped part is arranged at an angle with the length direction of the flexible circuit board. The groove comprises a first groove body for accommodating the strip-shaped part. The length direction of the strip-shaped part is arranged at an angle with the length direction of the flexible circuit board, so that the flexible circuit board is not easily moved in the four directions of front, back, left and right after being mounted, so that the position of the connecting assembly is stable, and thus the connection between the coupling medium and the grounding structure is stable.

[0035] In some embodiments, the convex part further comprises an arc-shaped part arranged in a spaced manner with the strip-shaped part. The arc-shaped part is used to support the flexible circuit board. The groove comprises a second groove body. The second groove body is in communication with the first groove body, and the second groove body is used to accommodate the arc-shaped part and at least part of the flexible circuit board. The arrangement of the arc-shaped part can make the flexible circuit board bend and fit on the arc-shaped part, so as to shorten the length of the flexible circuit board, reduce the space occupied by the flexible circuit board, and make the volume of the connecting assembly smaller, thereby facilitating installation. Meanwhile, the arc-shaped part cooperates with the second groove body, so as to position the flexible circuit board in the depth direction of the second groove body. BRIEF DESCRIPTION OF DRAWINGS

[0036] FIG. 1 is a side view structural schematic diagram of a foldable terminal with two folding parts in a folded state in the related art, in which the arrow represents the propagation direction of the external electromagnetic wave;

[0037] FIG. 2 is a partial structural schematic diagram of the folding part B in FIG. 1, in which the arrow represents the coupling direction between the two adjacent antennas;

[0038] FIG. 3 is a side view structural schematic diagram of a foldable terminal with three folding parts in a folded state in the related art;

[0039] FIG. 4 is a structural schematic diagram of a foldable mobile phone in an unfolded state according to an embodiment of the present application;

[0040] FIG. 5 is a structural schematic diagram of the foldable mobile phone in FIG. 4 in a folded state;

[0041] FIG. 6 is a top view structural schematic diagram of a folding part in the foldable mobile phone according to an embodiment of the present application;

[0042] FIG. 7 is a sectional view structural schematic diagram of the assembly structure of the folding part and part of the screen assembly in the foldable mobile phone according to an embodiment of the present application;

[0043] FIG. 8 is a structural schematic diagram of the assembly structure of a single folding part and part of the main display screen in the foldable mobile phone according to an embodiment of the present application;

[0044] FIG. 9 is a side view structural schematic diagram of a foldable mobile phone with two folding parts in a folded state according to an embodiment of the present application;

[0045] FIG. 10 is a side view structural schematic diagram of a foldable mobile phone with three folding parts in a folded state according to an embodiment of the present application;

[0046] FIG. 11 is a front view structural schematic diagram of the assembly structure of the housing assembly and part of the middle frame in the foldable mobile phone according to an embodiment of the present application;

[0047] FIG. 12 is a sectional view structural schematic diagram along the line A-A in FIG. 11;

[0048] FIG. 13 is a schematic diagram of a coupling principle of the coupling medium in FIG. 12;

[0049] FIG. 14 is a schematic diagram of a cross-sectional structure of a housing assembly in a foldable mobile phone according to an embodiment of the present application;

[0050] FIG. 15 is a schematic diagram of a cross-sectional structure of a housing assembly in a foldable mobile phone according to another embodiment of the present application;

[0051] FIG. 16 is a schematic diagram of a cross-sectional structure of a metal layer in a foldable mobile phone according to an embodiment of the present application;

[0052] FIG. 17 is a schematic diagram of a coupling principle of a foldable mobile phone according to another embodiment of the present application;

[0053] FIG. 18 is a schematic diagram of a partial cross-sectional structure of a housing assembly in a foldable mobile phone according to some embodiments of the present application;

[0054] FIG. 19 is a schematic diagram of a partial structure of a housing assembly in a foldable mobile phone according to some embodiments of the present application, in which the dashed line is a cross-sectional line;

[0055] FIG. 20 is a schematic diagram of a structure of a foldable terminal in a folded state according to an embodiment of the present application;

[0056] FIG. 21 is a schematic diagram of a side view of a structure of a foldable terminal in a folded state according to an embodiment of the present application;

[0057] FIG. 22 is a schematic diagram of a structure of a connecting assembly in a foldable terminal according to an embodiment of the present application;

[0058] FIG. 23 is a schematic diagram of a side view of a structure of the connecting assembly shown in FIG. 22;

[0059] FIG. 24 is a schematic diagram of a structure of a middle frame in a foldable terminal according to an embodiment of the present application;

[0060] FIG. 25 is a schematic diagram of a partial enlarged structure at A in FIG. 24;

[0061] FIG. 26 is a schematic diagram of a structure of a recess in a foldable terminal according to an embodiment of the present application.

[0062] Explanation of reference signs: 10, folding part; 11, first folding part; 12, second folding part; 20, rotating shaft; 30, screen assembly; 31, main display screen; 32, back display screen; 40, cavity; 41, opening; 110, middle frame; 111, first frame body; 112, second frame body; 113, third frame body; 114, first limiting part; 1141, strip-shaped part; 1142, arc-shaped part; 115, second limiting part; 1151, first slot body; 1152, second slot body; 116, grounding structure; 120, battery; 130, circuit board; 140, antenna; 160, shell; 161, shell assembly; 162, back shell; 170, connecting assembly; 171, flexible circuit board; 172, elastic piece; 173, second connecting piece; 310, coupling medium; 311, first part; 312, second part; 313, third part; 314, metal layer; 3141, first layer body; 3142, second layer body; 3143, first nickel layer; 3144, copper layer; 3145, second nickel layer; 315, metal part; 316, first plug-in part; 320, first edge part; 330, second edge part; 340, third edge part; 350, insulating part; 351, flat surface; 352, curved surface; 353, second plug-in part; 360, first connecting piece; 361, first connecting part; 362, second connecting part; 363, third connecting part; 370, glue layer; L1, length of the first part; L2, length of the first edge part; L3, length of the third part; L4, length of the third edge part; L5, size of the part of the metal layer on the curved surface in the first direction; H, thickness direction; X, first direction; Y, width direction of the opening; Z1, length direction of the strip-shaped part; Z2, length direction of the flexible circuit board. DETAILED DESCRIPTION

[0063] Embodiments of the present application are described in detail below with reference to examples illustrated in the accompanying drawings, in which the same or similar reference signs represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by reference to the accompanying drawings are exemplary and are intended to explain the present application, and cannot be understood as limiting the present application.

[0064] In the description of the present application, it should be understood that the positions or location relationships indicated by the terms "inner", "outer" and the like are based on the positions or location relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated devices or elements must have a particular position, be constructed and operated in a particular position, and therefore cannot be understood as limiting the present application.

[0065] In order to clearly describe the technical solutions of the embodiments of the present application, in the embodiments of the present application, the terms such as "first", "second" are used to distinguish the same or similar items with basically the same function and role. For example, the first limiting portion and the second limiting portion are only used to distinguish different limiting portions, and do not limit the sequence. Those skilled in the art can understand that the terms such as "first", "second" do not limit the quantity and execution sequence, and the terms such as "first", "second" do not necessarily mean different.

[0066] It should be noted that in the present application, the words such as "in an embodiment", "for example" are used to represent an example, illustration or description. Any embodiment or design scheme described as "in an embodiment" or "for example" in the present application should not be interpreted as more preferred or more advantageous than other embodiments or design schemes. On the contrary, the words such as "in an embodiment" or "for example" are intended to present the relevant concept in a specific way.

[0067] In the present application, unless otherwise explicitly specified and limited, the terms such as "connected", "connected" should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0068] In order to make the purpose, technical solutions and advantages of the present application more clear and obvious, the present application will be further described in detail below in combination with the drawings and embodiments.

[0069] In recent years, foldable terminals are more and more widely used. The foldable terminal generally includes a plurality of folding parts, and the plurality of folding parts are rotatably connected through a rotating shaft. Since the rotating shaft generally needs to have certain durability, stability and the like, the above rotating shaft is mostly made of metal material at least in part. In order to realize wireless communication, an antenna is generally provided on the folding part. The antenna is the main component of the foldable terminal for receiving and transmitting radio electromagnetic waves. It can convert electromagnetic waves into electrical signals for terminal processing; at the same time, it can also convert electrical signals into electromagnetic waves and transmit them out to realize communication function.

[0070] Some antennas are currently arranged on the side walls of the folding parts, and some of these antennas are arranged on the side wall adjacent to the hinge shaft. The hinge shaft includes metal components, and the antennas are also metal components. Since these metal components can be used as electromagnetic wave coupling media, the metal components in the hinge shaft and the antennas can form a complex electromagnetic environment. When the foldable terminal is in the folded state, additional propagation paths need to be provided for the electromagnetic waves emitted by the antennas on the foldable terminal or the electromagnetic waves (hereinafter referred to as external electromagnetic waves for the sake of description) reaching the foldable terminal from the outside. These paths can form a resonant cavity or similar structure, referred to as a "cavity membrane". The existence of the cavity membrane changes the propagation characteristics of the electromagnetic waves, including their direction, amplitude, and phase, resulting in spurious waves, which affects the radiation and reception performance of the antennas.

[0071] Specifically, in the folded state, there is often a certain gap between the two adjacent folding parts, that is, the foldable terminal forms a cavity (also referred to as the above-mentioned cavity membrane) with a very small height (i.e., the height of the gap) in the folded state. External electromagnetic waves can enter the above-mentioned cavity through the entrance and cannot be discharged, thereby causing the energy of the external electromagnetic waves to be stored and consumed, and unable to be radiated externally. At the same time, these electromagnetic waves can enhance the coupling effect between the antennas on the two folding parts arranged opposite to each other, resulting in poor isolation between the antennas on the two folding parts arranged opposite to each other. The poor isolation between the antennas can strengthen the interference between the antennas, resulting in a decline in communication quality. The decline in communication quality includes, but is not limited to, a decrease in data transmission rate, signal distortion, an increase in bit error rate, and the like. For example, a decrease in isolation between the LTE (Long Term Evolution) antenna and the WIFI (Wireless Fidelity, a wireless local area network based on the IEEE 802.11b standard) antenna can cause the transmission signal of the LTE antenna to interfere with the reception signal of the WIFI antenna, or the transmission signal of the WIFI antenna to interfere with the reception signal of the LTE antenna.

[0072] The related art is to adjust the cavity membrane frequency by opening an antenna slot on the folding part to improve the above-mentioned problems. As shown in FIG. 1 and FIG. 2, FIG. 1 is a side view structural schematic diagram of a folding state of a foldable terminal with two folding parts in the related art, and the arrow in the figure represents the propagation direction of the external electromagnetic wave; FIG. 2 is a partial structural schematic diagram of folding part B in FIG. 1, and the arrow in the figure represents the coupling direction between the two adjacent antennas. The external electromagnetic wave enters the cavity 40 formed by the two folding parts and a rotating shaft 20 through the opening 41 between the two folding parts (folding part A and folding part B). Since the cavity 40 is similar to a cavity membrane, the coupling effect between the antennas 140 originally arranged at intervals on the folding part is enhanced after the external electromagnetic wave enters, thereby causing the isolation of the antennas 140 on the two folding parts to deteriorate. The foldable terminal opens an antenna slot on the edge of the middle frame of the folding part B to adjust the frequency of the cavity membrane to improve this problem. With the wide popularization of foldable terminals in the market, the number of folding parts in the foldable terminal is no longer limited to two, but can also be three, four or more, and the number of corresponding rotating shafts also increases, and the structure of the cavity membrane is more complex, which causes the above-mentioned problems caused by the cavity membrane to worsen. Taking a foldable terminal with three folding parts as an example, as shown in FIG. 3. FIG. 3 is a side view structural schematic diagram of a folding state of a foldable terminal with three folding parts in the related art. The external electromagnetic wave enters the cavity 40 formed after the folding of the foldable terminal through the opening 41 between the folding part A and the folding part B and cannot be radiated outward, and the actual measurement affects the antenna 140 efficiency by about 8db. For foldable terminals with more than or equal to three folding parts, in the folded state, instead of the front surfaces of two folding parts facing each other, it is possible that the back surface of one folding part faces the back surface of another folding part, and in order to be aesthetically pleasing, the above-mentioned problem caused by the cavity membrane cannot be solved by opening an antenna slot on the back surface of the folding part. That is, for foldable terminals with more than or equal to three folding parts, the scheme of opening an antenna slot on the middle frame in the related art cannot solve the above-mentioned problem caused by the cavity membrane, so a design scheme that can optimize the antenna cavity membrane problem of foldable terminals with more than or equal to three folding parts becomes a key to affecting the antenna efficiency of the foldable terminal.

[0073] To improve the above-mentioned problems, or at least partially improve the above-mentioned problems, an embodiment of the present application provides a shell assembly. The shell assembly can be applied to a foldable terminal. A coupling medium is arranged on the shell assembly, which can form electromagnetic coupling with another folding part and / or rotating shaft in the folded state, thereby blocking the external electromagnetic wave from entering the cavity formed by the foldable terminal, i.e., the influence of the cavity membrane on the antenna can be isolated, a closed cavity structure is formed, the external electromagnetic wave is blocked outside the main display screen, and thus the occurrence probability of the problem of poor antenna isolation caused by the entry of the external electromagnetic wave can be reduced, and the use performance of the foldable terminal can be improved to a certain extent.

[0074] The foldable terminal includes, but is not limited to, a two-fold foldable terminal, a three-fold foldable terminal, a four-fold foldable terminal, and the like. The two-fold foldable terminal refers to a foldable terminal having two folding parts, the three-fold foldable terminal refers to a foldable terminal having three folding parts, and the four-fold foldable terminal refers to a foldable terminal having four folding parts. The foldable terminal can include, but is not limited to, a folding screen device such as a mobile phone, a tablet computer, a notebook computer, an electronic book reader, a wearable device (for example, a virtual reality (VR) glasses, a smart watch, a smart bracelet, a head-mounted display device, and the like), a wireless USB, a Bluetooth sound / earphone, a driving recorder, and the like.

[0075] The following embodiments are described by taking a foldable mobile phone provided by an embodiment of the present application as an example for convenience of description.

[0076] As shown in FIG. 4 and FIG. 5, FIG. 4 is a structural schematic diagram of a foldable mobile phone in an unfolded state according to an embodiment of the present application, and FIG. 5 is a structural schematic diagram of the foldable mobile phone in a folded state according to an embodiment of the present application. The foldable mobile phone includes a plurality of folding parts 10. The plurality of folding parts 10 are arranged in a preset order, and adjacent two folding parts 10 are rotationally connected through a rotating shaft 20. The preset order is generally arranged in a straight line in the unfolded state, and the straight line can be the width direction of the folding part 10, or the length direction of the folding part 10, which can be determined according to the use requirement. The end of the adjacent two folding parts 10 close to the rotating shaft 20 can rotate around the rotating shaft 20 located between the two folding parts 10, so that the end of the two folding parts 10 away from the rotating shaft 20 relatively approaches or relatively moves away, and the foldable mobile phone can correspondingly present different states such as folding or unfolding. It can be understood that when the folding part 10 is provided with three or more, each folding part 10 can rotate around the adjacent rotating shaft 20, thereby forming a multi-layer folding structure. At this time, the foldable mobile phone has multiple folding modes. For convenience of description, the foldable mobile phone with three folding parts 10 is taken as an example for description. The foldable mobile phone can adopt the folding mode shown in FIG. 5, that is, folded in a Z-shaped manner, or adopt the folding mode shown in FIG. 3, that is, folded in a G-shaped manner.

[0077] As shown in FIG. 6, FIG. 6 is a top view structural schematic diagram of the folding part in the foldable mobile phone provided by the embodiment of the present application. Each folding part 10 comprises at least a middle frame 110. The middle frame 110 is the main support structure of the folding part 10, and is connected with the rotating shaft. Generally, the middle frame 110 is provided with a grounding structure 116 for grounding. The grounding structure 116 can be the whole middle frame 110 according to the need, or can be provided on a part of the middle frame 110. In addition, the folding part 10 further comprises at least one component of a battery 120, a circuit board 130, an antenna 140, etc. These components are arranged on the middle frame 110. It can be understood that the number and mounting position of the above-mentioned battery 120, circuit board 130 and antenna 140 can be determined according to the need of use. It can be that each middle frame 110 is provided with the battery 120, circuit board 130 and antenna 140, or a single middle frame 110 is provided with any component or multiple components of the battery 120, circuit board 130 and antenna 140, which can be determined according to the need of use. For example, when the foldable mobile phone has three folding parts 10, the first middle frame 110 can be provided with the battery 120, circuit board 130 and antenna 140, the second middle frame 110 can be provided with the circuit board 130, and the third middle frame 110 can be provided with the antenna 140; or the first middle frame 110 can be provided with the battery 120 and circuit board 130, the second middle frame 110 can be provided with the circuit board 130 and antenna 140, and the third middle frame 110 can be provided with the battery 120, etc.

[0078] Specifically, one or more circuit boards 130 can be provided. Generally, each circuit board 130 is provided with electronic components, and the types and quantities of the electronic components can be determined according to the use needs of the electronic device. The electronic components can include, but are not limited to, a system chip (SoC), a UFS (UNIX file system), a computer aided manufacturing (CAM) element, a universal serial bus (USB) interface, a subscriber identity module (SIM) card, an antenna module, a Bluetooth module, a wireless connection module, a global positioning system (GPS) module, a power supply, a charging module, a screen display and operation module, and the like. It can be understood that when the circuit board 130 is provided with multiple circuit boards, the electronic components on each circuit board 130 can be the same or different. For example, a system chip, a UFS, a computer aided manufacturing element, and the like can be provided on the first circuit board 130, a universal serial bus interface, a subscriber identity module card, an antenna module, a Bluetooth module, a wireless connection module, and the like can be provided on the second circuit board 130, a global positioning system module, a power supply, a charging module, a screen display and operation module, and the like can be provided on the third circuit board 130; or a universal serial bus interface, a subscriber identity module card, a system chip, a UFS, and the like can be provided on the first circuit board 130, a global positioning system module, a power supply, a charging module, a screen display and operation module, a computer aided manufacturing element, and the like can be provided on the second circuit board 130, and an antenna module, a Bluetooth module, a wireless connection module, and the like can be provided on the third circuit board 130. The antenna 140 can include, but is not limited to, the following: a WiFi antenna, a GPS antenna, a Bluetooth antenna, and a near field communication (NFC) antenna.

[0079] As shown in FIG. 4, FIG. 5 and FIG. 7, FIG. 7 is a cross-sectional structural schematic diagram of the assembly structure of the folding part and part of the screen assembly in the foldable mobile phone provided by the embodiment of the present application. In addition to the folding part 10 described above, the foldable mobile phone generally also includes a screen assembly 30, which at least includes one main display screen 31. The main display screen 31 is covered on one side of the support device composed of multiple folding parts 10 (hereinafter referred to as the front side of the support device for ease of description). As shown in FIG. 4. The main display screen 31 is generally a flexible display screen, which can be folded or unfolded accordingly with the change of the position between adjacent folding parts 10. Specifically, when the foldable mobile phone includes three folding parts 10, the three folding parts 10 are respectively in an unfolded position, the foldable mobile phone is in an unfolded state, and the three folding parts 10 are arranged side by side and coplanar. Correspondingly, the main display screen 31 covering the surface of the folding part 10 can form a larger display surface in the unfolded state, which can be used as a separate display screen for display, as shown in FIG. 4. When the three folding parts 10 are respectively in a folded position, the foldable mobile phone is in a folded state, at this time the ends of the three folding parts 10 away from the rotating shaft 20 are close to each other, and the main display screen 31 is folded, as shown in FIG. 5. It can be understood that when the folding part 10 is provided with four or more, the main display screen 31 can be made of a larger area screen, and a larger display area can be obtained in the unfolded state of the foldable mobile phone.

[0080] With the increase of the function of the foldable mobile phone, in addition to the main display screen 31 described above, the screen assembly 30 can also include at least one back display screen 32, which is arranged on the back side (the side opposite to the above-mentioned front side) of the support device, which can be one or more. And the back display screen 32 can be a rigid display screen or a flexible display screen, which can be determined according to the use requirement. For example, when the back display screen 32 is arranged on only one folding part 10, the back display screen 32 does not need to have a bending function, at this time the back display screen 32 can adopt a rigid display screen; when the back display screen 32 covers at least two folding parts 10, the back display screen 32 needs to have a bending function, at this time the back display screen 32 can adopt a flexible display screen.

[0081] As shown in FIG. 7, in order to make the appearance of the foldable terminal beautiful and make the screen assembly 30 not easy to be damaged, generally, the folding part 10 further comprises a shell 160. The shell 160 comprises a shell assembly 161 arranged on the front of the middle frame 110 and a back shell 162 arranged on the back of the middle frame 110. Among them, the front is the side of the middle frame 110 where the main display screen 31 is arranged, and the back is the side opposite to the front. Among them, the back shell 162 can be made of metal material, or can be made of other materials (such as plastic material, composite material, etc.), to protect the internal elements of the foldable mobile phone, and carry the back display screen 32, in addition, the back shell 162 also carries part of the appearance design and brand logo of the foldable mobile phone. In related technologies, the shell assembly 161 is made of non-metallic material. The shell assembly 161 not only can play a role in protecting the main display screen 31 from scratches, collisions and falling damage, but also can directly affect the appearance and feel of the foldable mobile phone.

[0082] Specifically, part of the shell assembly 161 is connected with the middle frame 110, and the other part is located outside the main display screen 31 and clamps the main display screen 31 with the middle frame 110. Since the main display screen 31 covers multiple folding parts 10, the shell assembly 161 is arranged on each folding part 10, and the shell assemblies 161 on multiple folding parts 10 form a protective shell arranged around the main display screen 31. It can be understood that since the two adjacent folding parts 10 are arranged at intervals and connected by the rotating shaft 20, the shell assemblies 161 located on the two adjacent folding parts 10 will be spaced due to the existence of the rotating shaft 20, that is, the above-mentioned protective shell is a non-continuous structure. Since the main display screen 31 is a continuous screen, and the unfolded length is generally less than the unfolded length of the multiple folding parts 10, the coverage area of the main display screen 31 on the folding part 10 located at the end is less than that on the folding part 10 located in the middle, as shown in FIG. 4. In order to make the appearance of the foldable terminal beautiful, the shell assembly 161 needs to cover the area not covered by the main display screen 31, which leads to the possibility that the structures of the shell assemblies 161 on different folding parts 10 are different. For example, when the foldable terminal comprises two folding parts 10, the coverage areas of the main display screen 31 on the two folding parts 10 can be the same or different, and the structures and sizes of the shell assemblies 161 on the two folding parts 10 can be the same or different when the coverage areas are the same or different; as shown in FIG. 4, when the foldable terminal comprises three folding parts 10, generally, the main display screen 31 can completely cover the folding part 10 located in the middle, but can only cover part of the two folding parts 10 located at the edge. At this time, the folding part 10 located in the middle can not be provided with the shell assembly 161, or only the strip-shaped shell assembly 161 is arranged on both sides of the main display screen 31, and the U-shaped shell assembly 161 needs to be arranged on the folding part 10 located at the edge.

[0083] As shown in FIG. 8, which is a structural schematic diagram of the assembly structure of a single folding part and part of a main display screen in a foldable mobile phone according to an embodiment of the present application. An embodiment of the present application provides a housing assembly 161. At least part of the housing assembly 161 is a coupling medium 310. As shown in FIG. 9 and FIG. 10, FIG. 9 is a side structural schematic diagram of a foldable mobile phone with two folding parts in a folded state according to an embodiment of the present application, and FIG. 10 is a side structural schematic diagram of a foldable mobile phone with three folding parts in a folded state according to an embodiment of the present application. In the diagrams, a single arrow represents the propagation direction of an external electromagnetic wave, and a double arrow represents the coupling direction. The coupling medium 310 is used to electromagnetically couple with another folding part 10 and / or a rotating shaft arranged oppositely in a folded state, and the coupling medium 310 is electrically connected with a grounding structure 116 of the folding part 10.

[0084] The coupling medium 310 refers to a medium capable of producing electromagnetic coupling phenomenon with another element (such as the above-mentioned another folding part 10 arranged oppositely). The coupling medium 310 can be metal, or a composite material or other material capable of producing electromagnetic induction.

[0085] Electromagnetic coupling, also known as mutual inductive coupling, is due to the mutual inductance between two circuits, so that the current change of one circuit affects the other circuit through mutual inductance. This coupling is achieved through electromagnetic field interaction, that is, the current change in one circuit produces a magnetic field, which in turn affects another circuit. When an electromagnetic wave passes through an electromagnetic coupling region, its electromagnetic field can interact with the circuit elements in the region. In particular, when there is mutual inductance between these circuit elements, the energy of the electromagnetic wave can be transferred to one of the circuit elements through electromagnetic coupling.

[0086] Specifically, as shown in FIG. 9, when the foldable mobile phone includes two folding parts 10, in the folded state, the two folding parts 10 are arranged opposite to each other on one side of the housing assembly 161. At this time, the coupling medium 310 on the two housing assemblies 161 is electrically connected to the grounding structure 116 on the respective folding part 10 to form two circuits, and there is mutual inductance between the two circuits. When the current in one of the circuits changes, a magnetic field is generated, which affects the other circuit. In this way, in the folded state, when external electromagnetic waves enter the cavity 40 of the foldable terminal through the opening 41 of the two folding parts 10, the above-mentioned external electromagnetic waves will enter one of the housing assemblies 161 under the action of electromagnetic coupling, and be conducted to the corresponding grounding structure 116 through the housing assembly 161 for discharge, or be reflected back to the source, without entering the area where the shaft 20 is located inside the cavity 40 through the above-mentioned opening 41. In this way, it plays a role in blocking external electromagnetic waves from entering the above-mentioned cavity 40, like adding an invisible baffle D at the opening 41, to a certain extent, it alleviates the problem of poor antenna isolation. It can be understood that the dashed line D in FIG. 9 is an auxiliary line for easy understanding, and is not a structure line of the foldable mobile phone.

[0087] When the foldable mobile phone includes more than three (including three) folding parts 10, in the folded state, according to different folding methods, the housing assembly 161 on the folding part 10 at the end can be arranged opposite to the housing assembly 161 of another folding part 10, or can be arranged opposite to the back cover of another folding part 10, as shown in FIG. 10. When the housing assembly 161 on the folding part 10 at the end is arranged opposite to the housing assembly 161 of another folding part 10, the principle of blocking electromagnetic waves is similar to that of the above-mentioned foldable terminal including two folding parts 10. However, when the housing assembly 161 is arranged opposite to the housing assembly 161 of another folding part 10, it is also arranged adjacent to the shaft 20 on one side of another folding part 10. The coupling medium 310 on the housing assembly 161 can also be electromagnetically coupled with the shaft 20 while being electromagnetically coupled with another folding part 10, thereby achieving the blocking of external electromagnetic waves. When the housing assembly 161 on the folding part 10 at the end is arranged opposite to the back cover of another folding part 10, the back cover can be made of metal, or a metal layer or other coupling medium can be arranged on the back cover opposite to the housing assembly 161 to achieve coupling. The principle of blocking electromagnetic waves is similar to that of the above-mentioned foldable terminal including two folding parts 10. However, when the housing assembly 161 is arranged opposite to the back cover of another folding part 10, it is also arranged adjacent to the shaft 20 on one side of another folding part 10. The coupling medium 310 on the housing assembly 161 can also be electromagnetically coupled with the shaft 20 while being electromagnetically coupled with another folding part 10, thereby achieving the blocking of external electromagnetic waves.

[0088] In summary, the shell assembly 161 provided in the embodiments of the present application is provided with the coupling medium 310, which can form electromagnetic coupling with another folding part 10 and / or the rotating shaft 20 in the folded state, thereby blocking external electromagnetic waves from entering the cavity 40 surrounded by the foldable terminal, i.e., the influence of the cavity film on the antenna can be isolated, a closed cavity structure is formed, external electromagnetic waves are blocked outside the main display screen, and the occurrence probability of the problem of poor antenna isolation caused by the entry of external electromagnetic waves can be reduced, and the use performance of the foldable terminal can be improved to a certain extent. The coupling medium 310 is connected with the grounding structure 116, which can provide a low-impedance path for external electromagnetic waves entering the shell assembly 161, so that the external electromagnetic waves can be more easily absorbed or reflected back to the source rather than propagating through the gap.

[0089] As shown in FIG. 8, in some embodiments, the shell assembly 161 has a first edge part 320, a second edge part 330 and a third edge part 340 connected in sequence. The first edge part 320 and the third edge part 340 are located on the same side of the second edge part 330. The coupling medium 310 has a first part 311 located at the first edge part 320, a second part 312 located at the second edge part 330, and a third part 313 located at the third edge part 340. The first part 311 and the third part 313 are connected through the second part 312.

[0090] The second edge part 330 is generally parallel to the rotating shaft and is located at the end of the main display screen 31. The first edge part 320 and the third edge part 340 are generally arranged on both sides of the main display screen 31 and are connected perpendicularly or at other angles with the second edge part 330. The length of the second part 312 of the coupling medium 310 is generally equal to or slightly smaller than the length of the second edge part 330; the length of the first part 311 is generally smaller than or equal to the length of the first edge part 320; and the length of the third part 313 is generally smaller than or equal to the length of the third edge part 340, which can be determined according to the use requirement. The slight smaller refers to that the difference between the length of the second part 312 and the length of the second edge part 330 is less than or equal to 5% of the length of the second edge part 330.

[0091] The shell assembly 161 in the embodiments is generally located on the edge folding part 10 of the foldable terminal having three or more folding parts 10, or can be located on any folding part 10 of the foldable terminal having two folding parts 10.

[0092] The coupling medium 310 is composed of three parts, which can cover a large area of the housing assembly 161, so that the volume of the coupling medium 310 is large, and the area of the electromagnetic coupling region of the other folding part 10 is large, thereby the external electromagnetic wave can be blocked as much as possible from entering the cavity 40 of the foldable terminal.

[0093] Since the opening 41 formed by the foldable terminal in the folded state is a U-shaped opening facing the hinge shaft 20, which can be understood in combination with FIG. 9, the opening 41 includes a port opposite to the hinge shaft 20, and two side openings adjacent to the hinge shaft 20. When the external electromagnetic wave enters the cavity 40 of the foldable terminal through one of the side openings, most of the electromagnetic wave can be discharged through the other side opening, and only most of the electromagnetic wave of the external electromagnetic wave entering through the port opposite to the hinge shaft 20 can reach the area where the hinge shaft 20 is located, which affects the isolation degree of the antenna 140 on the foldable terminal. And the production cost of the coupling medium 310 is generally high, in order to make the preparation cost of the foldable terminal lower, in some embodiments, the length of the first part 311 is less than the length of the first edge part 320, and the length of the third part 313 is less than the length of the third edge part 340. That is, the coupling medium 310 is only arranged in part of the first edge part 320 and the third edge part 340. Compared with arranging the coupling medium 310 in all areas of the first edge part 320 and the third edge part 340, the volume of the coupling medium 310 and the amount of required material can be reduced, and the preparation cost of the housing assembly 161 and the foldable terminal can be reduced. At the same time, the coupling medium 310 can also block the external electromagnetic wave from entering the cavity 40 of the foldable terminal through the above-mentioned port, so that the performance of the foldable terminal is good.

[0094] The above-mentioned coupling medium 310 can have various arrangement modes, which will be illustrated by way of example.

[0095] Embodiment one

[0096] As shown in FIGS. 11-13, FIG. 11 is a front structural schematic diagram of the assembly structure of the housing assembly and part of the middle frame in the foldable mobile phone provided by the embodiment of the present application, FIG. 12 is a sectional structural schematic diagram along the line A-A in FIG. 11, and FIG. 13 is a coupling principle schematic diagram of the coupling medium in FIG. 12. The housing assembly 161 further includes an insulating part 350. The insulating part 350 has a first surface facing the other folding part 10 and a second surface opposite to the first surface. The coupling medium 310 includes a metal layer 314, at least part of the metal layer 314 is arranged on the first surface, and the metal layer 314 is electrically connected with the grounding structure 116.

[0097] The metal layer in the embodiment can be made of at least one of copper, nickel, gold and the like.

[0098] The metal layer 314 in this embodiment can be arranged on the first surface only, or can be arranged on the first surface and the second surface. It can be understood that when the metal layer 314 is arranged on the first surface and the second surface, the metal layer 314 arranged on the two surfaces is connected to each other. In this case, the grounding structure 116 can be arranged outside the shell assembly 161, as shown in FIG. 13, or can be arranged partly inside the insulating part 350 and partly outside the insulating part 350, which can be determined according to the use requirement. As shown in FIG. 12, in some embodiments, the metal layer 314 has a first layer body 3141 and a second layer body 3142 connected to each other, the first layer body 3141 is arranged on the first surface of the insulating part 350, and the second layer body 3142 is arranged on the second surface of the insulating part 350. When the grounding structure is arranged outside the shell assembly 161, the second layer body 3142 is electrically connected to the grounding structure, which facilitates the connection between the grounding structure and the metal layer 314. As shown in FIG. 14, which is a schematic structural diagram of a cross section of a shell assembly of a foldable mobile phone according to an embodiment of the present application, in other embodiments, the metal layer 314 has a first layer body 3141 and a second layer body 3142 connected to each other, the first layer body 3141 is arranged on the first surface, and the second layer body 3142 is arranged on the second surface of the insulating part 350. The shell assembly further comprises a first connecting member 360. The first connecting member 360 is embedded in the insulating part 350, and the first connecting member 360 is electrically connected to the first layer body 3141 and the second layer body 3142. The first connecting member 360 is used to be electrically connected to the grounding structure. The first connecting member 360 can be a spring, or can be a metal block, a wire, etc., which can be determined according to the use requirement. In this way, the connection stability between the grounding structure and the metal layer 314 can be improved to a certain extent.

[0099] When the metal layer 314 is arranged on the first surface only, the grounding structure can be directly electrically connected to the metal layer 314 through the insulating part 350, or can be electrically connected to the metal layer 314 by means of a connecting member embedded at least partly in the insulating part 350, which can be determined according to the use requirement. As shown in FIG. 15, which is a schematic structural diagram of a cross section of a shell assembly of a foldable mobile phone according to another embodiment of the present application, in some embodiments, the shell assembly 161 further comprises a first connecting member 360, the first connecting member 360 is embedded in the insulating part 350, and the first connecting member 360 is electrically connected to the metal layer 314. The first connecting member 360 is used to be electrically connected to the grounding structure. The first connecting member 360 can be a spring, or can be a metal block, a wire, etc., which can be determined according to the use requirement. In this way, the required material of the metal layer 314 can be reduced, the manufacturing cost can be reduced, and the application can be facilitated.

[0100] To stabilize the connection between the first connecting member 360 and the metal layer 314, in some embodiments, the first connecting member 360 comprises a first connecting portion 361, a second connecting portion 362 and a third connecting portion 363 connected in sequence. The first connecting portion 361 is in surface contact with the part of the metal layer 314 on the first surface. The third connecting portion 363 is used to be in surface contact with the part of the metal layer 314 on the second surface or the ground structure 116. In this way, the connection area between the first connecting member 360 and the metal layer 314 and the ground structure 116 can be large, and the connection between the first connecting member 360 and the metal layer 314 and the ground structure 116 can be stabilized to a certain extent. In some embodiments, the first connecting member 360 is folded from a sheet. In this way, the connection between the parts of the first connecting member 360 can be stable, and the preparation is convenient.

[0101] Regardless of the above-mentioned schemes, by using the scheme provided in Embodiment One, the metal layer 314 can be prepared on the outside of the insulating portion 350 by electroplating. In this way, less coupling medium 310 can be used to cover a larger surface area of the shell assembly 161, that is, while ensuring that the coupling area between the coupling medium 310 and the other folding portion 10 is large, less material is used for the coupling medium 310, so that the performance of the foldable terminal is good while the preparation cost is low.

[0102] On the basis of Embodiment One, in order to make the coupling area between the coupling medium and the other folding portion larger, as shown in FIG. 15, in some embodiments, the first surface comprises a plane 351 and a curved surface 352 connected in sequence along the first direction X, and a part of the metal layer 314 is located on the plane 351 and another part extends to the curved surface 352. The first direction X is generally the length direction of the main display screen 31, and is also the direction perpendicular to the length direction of the rotation shaft. In this way, the coverage area of the metal layer 314 can be large, and the coupling area between the coupling medium 310 and the other folding portion can be large, so that external electromagnetic waves can be blocked as much as possible from entering the cavity of the foldable terminal.

[0103] On the basis of the above-mentioned embodiments, in order to further ensure that the coupling area between the coupling medium and the other folding portion is large enough, in some embodiments, the size L5 of the part of the metal layer 314 on the curved surface 352 in the first direction X is greater than or equal to 1 mm. In this way, the metal layer 314 can cover a larger curved surface 352, so that the coverage area of the metal layer 314 is large enough, and a large coupling area can be formed with the other folding portion to meet the use needs.

[0104] On the basis of the above-mentioned embodiments, in order to ensure that the electromagnetic coupling effect of the metal layer and the other folding part is better, in some embodiments, the thickness d of the metal layer 314 is greater than or equal to 5 microns. In this way, the electromagnetic coupling phenomenon between the metal layer 314 and the other folding part 10 can be obvious, and the effect of blocking the entry of electromagnetic waves can be met.

[0105] In some embodiments, the thickness d of the metal layer 314 is 5 microns-10 microns. In this way, the shell assembly 161 can well block the entry of external electromagnetic waves, while the thickness of the shell assembly 161 is small, so that the appearance of the foldable terminal is beautiful.

[0106] In some embodiments, the thickness d of the metal layer 314 is 5 microns-20 microns. In this way, the shell assembly 161 can well block the entry of external electromagnetic waves, while the thickness of the shell assembly 161 is small, so that the appearance of the foldable terminal is beautiful.

[0107] In order to make the coupling effect of the metal layer 314 good, a metal with good conductivity, such as copper, is generally used, but the adhesion of copper is poor. In order to make the metal layer 314 have good adhesion and good conductivity, as shown in FIG. 16, which is a cross-sectional structure schematic diagram of the metal layer in the foldable mobile phone provided by the embodiments of the present application, in some embodiments, the metal layer 314 includes a first nickel layer 3143, a copper layer 3144 and a second nickel layer 3145 which are sequentially stacked along the thickness direction H of the metal layer 314. The copper layer 3144 is mainly used for electromagnetic coupling with the other folding part, the first nickel layer 3143 can be directly provided on the surface of the insulating part 350 to provide an adhesion platform for the copper layer 3144, and the second nickel layer 3145 is provided to protect the copper layer 3144 and facilitate the designer to perform surface treatment outside the second nickel layer 3145 to meet the aesthetic and other use needs of the shell assembly 161.

[0108] It can be understood that the first nickel layer 3143, the copper layer 3144 and the second nickel layer 3145 can be respectively prepared by electroplating. For example, when the first nickel layer 3143 is prepared, the insulating part 350 can be treated by a laser etching process, and then the first nickel layer 3143 is prepared by electroplating, and then the copper layer 3144 is prepared by electroplating. The copper layer 3144 can be prepared by pre-plating and then secondary electroplating. The first nickel layer 3143 and the second nickel layer 3145 can also be prepared by secondary electroplating, which can be determined according to the preparation needs.

[0109] Embodiment two

[0110] As shown in FIG. 17, FIG. 17 is a schematic diagram of a coupling principle of a foldable mobile phone according to another embodiment of the present application. The coupling medium 310 includes a metal part 315. The housing assembly 161 further includes an insulating part 350, which is arranged on a side of the metal part 315 away from the main display screen 31 of the foldable terminal and is connected with the metal part 315.

[0111] The metal part 315 is a part made of metal, which can be a solid structure or a hollow structure.

[0112] The insulating part 350 is a part made of non-metallic material, which can be a solid structure or a hollow structure.

[0113] The insulating part 350 can be connected with the metal part 315 by means of bonding, welding, insertion or the like. The coupling medium 310 adopts the scheme provided in the embodiment, so that the metal part 315 and the insulating part 350 can be respectively prepared and then assembled, which is convenient for preparation and helps to improve the preparation efficiency.

[0114] On the basis of the second embodiment, the metal part 315 and the insulating part 350 can be connected in various ways, which will be illustrated by way of example.

[0115] As shown in FIG. 18, FIG. 18 is a schematic diagram of a partial cross-sectional structure of a housing assembly in a foldable mobile phone according to some other embodiments of the present application. In some embodiments, at least part of the metal part 315 and at least part of the insulating part 350 are overlapped in the thickness direction of the housing assembly and are connected by a glue layer 370. The metal part 315 and the insulating part 350 are bonded by the glue layer 370, which is convenient in material selection and operation.

[0116] In order to prevent the position of the glue layer 370 from changing, a groove structure or a rib structure for applying the glue layer 370 can be arranged on the contact surface of the metal part 315 or the insulating part 350 to limit the position of the glue layer 370 on the metal part 315 or the insulating part 350, so that the bonding operation is more convenient and the consistency of different products is better.

[0117] As shown in FIG. 19, which is a schematic diagram of a partial structure of a shell assembly in a foldable mobile phone according to some embodiments of the present application, the dashed line is a section line. In some embodiments, the metal part 315 has a first plug-in part 316, and the insulating part 350 has a second plug-in part 353 adapted to the first plug-in part 316. The insulating part 350 is plugged with the metal part 315 through the second plug-in part 353 and the first plug-in part 316. The shape and arrangement of the first plug-in part 316 and the second plug-in part 353 can be various. For example, the first plug-in part 316 can be a groove, and the second plug-in part 353 can be a protrusion adapted to the groove; or the first plug-in part 316 can be a protrusion, and the second plug-in part 353 can be a groove adapted to the protrusion; or the first plug-in part 316 includes a protrusion and a groove, and the second plug-in part 353 includes a groove adapted to the protrusion and a protrusion adapted to the groove. The metal part 315 and the insulating part 350 are connected in the manner provided in the embodiments, i.e., the metal part 315 is first prepared, then the metal part 315 is placed in an injection molding tool, and the insulating part 350 is injected on one side of the metal part 315. In this way, the contact area of the insulating part 350 and the metal part 315 is large, and the connection between the two is stable and not easy to separate. Meanwhile, the combined structure of the insulating part 350 and the metal part 315 has a large strength.

[0118] The insulating part 350 in the above embodiments can be a plastic part or a part made of other non-metal insulating materials.

[0119] In addition to the arrangement shown in Embodiment 1 and Embodiment 2, the coupling medium 310 can also have other arrangements, such as the entire shell assembly 161 being the coupling medium 310 and the coupling medium 310 being metal. That is, the entire shell assembly 161 is made of metal. In this way, when the foldable terminal is in the folded state, the electromagnetic coupling area of the two folding parts 10 forming the port is large, so that external electromagnetic waves can be blocked as much as possible, and the performance of the foldable terminal is good. Of course, in addition to this, in other embodiments, the coupling medium 310 can also have other arrangements, as long as it can form electromagnetic coupling with another folding part to block external electromagnetic waves from entering the cavity of the foldable mobile phone.

[0120] In some embodiments of the present application, a foldable terminal is also provided. The foldable terminal has an unfolded state and a folded state, and in the folded state, the inner surface of the foldable terminal encloses at least one cavity 40. As shown in FIG. 20, which is a schematic diagram of a foldable terminal in a folded state according to an embodiment of the present application.

[0121] It should be noted that in the folded state, there is often a gap between the two adjacent folding parts 10, at this time the inner surface of the foldable mobile phone will form at least one cavity 40, the specific case can be determined according to the number and folding mode of the folding part 10 in the foldable mobile phone. For example, when the foldable mobile phone has two folding parts 10, in general, in the folded state, the front surfaces of the two folding parts 10 are opposite, at this time the main display screen provided on the support device formed by the two folding parts 10 is bent into two opposite halves, and the inner surface of the above-mentioned foldable mobile phone is mainly composed of the outer surface of the main display screen and the outer surface of the shell assembly; in special cases, in the folded state, the back surfaces of the two folding parts 10 can also be opposite, at this time the inner surface of the above-mentioned foldable mobile phone is mainly composed of the outer surface of the back shell of the two folding parts 10 and the inner surface of the shaft 20 of the two folding parts 10. When the foldable mobile phone has three folding parts 10, the foldable mobile phone has at least two folding modes: the first is a Z-shaped folding mode, as shown in FIG. 5, and the second is a G-shaped folding mode, as shown in FIG. 20. When the first folding mode is adopted, the foldable mobile phone forms two cavities 40 separated from each other, the inner surface of one cavity 40 is mainly composed of the outer surface of the main display screen 31 and the outer surface of the shell assembly 161, and the inner surface of the other cavity 40 is mainly composed of the outer surface of the back shell of the two folding parts 10 and the inner surface of the shaft 20 of the two folding parts 10. When the second folding mode is adopted, the inner surface of the above-mentioned foldable mobile phone not only includes the outer surface of the main display screen and the outer surface of the shell assembly, but also includes the outer surface of the back shell of one folding part 10 located at the end.

[0122] The foldable terminal includes a first folding part 11 and a second folding part 12. In the folded state, the second folding part 12 is arranged opposite to the first folding part 11. At least one folding part 10 of the first folding part 11 and the second folding part 12 is provided with a main display screen and a shell assembly on the side facing the other folding part 10. Here, the surrounding refers to the part of the main display screen located on the folding part 10 provided with the shell assembly, and the surrounding only surrounds the other three sides except the side where the shaft 20 is located. That is, the shell assembly is in the shape of a U, and the opening is arranged towards the side where the shaft 20 is located. The shell assembly and the other folding part 10 form an opening 41 that connects the cavity 40 and the external space. The opening 41 is also arranged in the shape of a U.

[0123] The shell assembly is the shell assembly provided in any of the above embodiments. That is, at least part of the shell assembly 161 is a coupling medium 310 for electromagnetically coupling with the other folding part 10 arranged opposite in the folded state. The arrangement and working principle of the coupling medium 310 are consistent with the foregoing, which will not be repeated here.

[0124] In order to make the size of the coupling medium 310 larger, so that the coupling area of the first folding part 11 and the second folding part 12 is larger, as shown in FIG. 21, which is a side view structural schematic diagram of the foldable terminal in the folded state provided in the embodiments of the present application, in some embodiments, in the width direction Y of the opening 41, the width of the coupling medium 310 is substantially equal to the width of the opening 41. The width direction of the opening 41 is parallel to the length direction of the rotation shaft 20. Substantially equal means that the width of the coupling medium 310 can be completely equal to the width of the opening 41, or the width of the coupling medium 310 can be slightly smaller than the width of the opening 41, and slightly smaller means that the difference between the two can be less than or equal to 10% of the width of the opening 41. In this way, in the width direction Y of the opening 41, the width of the coupling area of the first folding part 11 and the second folding part 12 can be substantially equal to the width of the opening 41, so that most of the electromagnetic waves can be blocked from entering the cavity 40 of the foldable terminal through the coupling area, so that the isolation of the antenna 140 of the foldable terminal is not easily affected by external electromagnetic waves, and the use effect is ensured.

[0125] On the basis of the above-mentioned embodiments, in order to facilitate the electrical connection between the coupling medium 310 and the grounding structure 116, as shown in FIG. 17, in some embodiments, the coupling medium 310 is electrically connected to the grounding structure 116 on the folding part 10 through a connecting assembly 170. The connecting assembly 170 can include a wire, a flexible circuit board 171 or other electrical connecting member, so that the arrangement of the grounding structure 116 and the coupling medium 310 is not affected by each other, facilitating preparation and connection.

[0126] As shown in FIG. 22 and FIG. 23, FIG. 22 is a structural schematic diagram of the connecting assembly in the foldable terminal provided in the embodiments of the present application, and FIG. 23 is a side view structural schematic diagram of the connecting assembly shown in FIG. 22. In some embodiments, the connecting assembly 170 includes a flexible circuit board 171. The flexible circuit board 171 is arranged on the inner side of the coupling medium. The inner side means the side of the coupling medium away from the other folding part, or the side of the coupling medium away from the outer surface of the coupling medium or the outer surface of the shell assembly. The flexible circuit board 171 is electrically connected to the coupling medium. The flexible circuit board 171 is electrically connected to the grounding structure. Specifically, the flexible circuit board 171 can be directly electrically connected to the coupling medium, or can be electrically connected to the coupling medium through a wire, a copper sheet or other connecting member, and similarly, the flexible circuit board 171 can be directly electrically connected to the grounding structure, or can be electrically connected to the grounding structure through a copper sheet, a wire or other connecting member. The connecting assembly 170 adopts the scheme provided in the embodiments, and the structure is simple and convenient to assemble.

[0127] In some embodiments, the flexible circuit board 171 is electrically connected to the coupling medium through the elastic member 172. The elastic member 172 can be a spring, or can include a spring and other structures, such as a spring and a rigid member, which can be determined according to the needs of use. The elastic member 172 in the present embodiment can be the first connecting member described above, or can be other elastic members 172 in addition to the first connecting member.

[0128] The elastic member 172 can achieve elastic contact between the flexible circuit board 171 and the coupling medium, so that the connection is stable, and the coupling medium is not easily separated from the foldable terminal when the foldable terminal shakes, vibrates, or the like, so that the grounding effect of the coupling medium is good.

[0129] In an optional embodiment, the elastic member 172 is a spring, which is assembled on the flexible circuit board 171 through SMT (Surface Mount Technology).

[0130] In the above embodiments, the flexible circuit board 171 can be directly welded with the grounding structure, but in this welding mode, it is necessary to ensure that the contact surface between the flexible circuit board 171 and the grounding structure is flat and free of impurities, and it is necessary to control the welding temperature and time to avoid thermal damage to the flexible circuit board 171. To solve the above problems, in some embodiments, the connecting assembly 170 further includes a second connecting member 173, which connects the flexible circuit board 171 and the grounding structure. The second connecting member 173 can be a copper sheet, an iron sheet, a wire, or the like, as long as it can achieve electrical connection between the flexible circuit board 171 and the grounding structure. With the second connecting member 173, compared with direct welding of the flexible circuit board 171 and the grounding structure, more flexibility and fault tolerance can be provided for welding. When the second connecting sheet is a copper sheet, since the copper sheet has better electrical conductivity and thermal conductivity, and its mechanical strength is also higher, it can make the connection structure between the flexible circuit board 171 and the grounding structure withstand greater stress and vibration, which can improve the reliability of the welding to a certain extent, and improve the heat dissipation performance of the connection structure to a certain extent, reducing the risk of damage to the connection structure due to overheating.

[0131] In an optional embodiment, the second connecting member 173 is a spring sheet spot-welded with the first frame. The connecting assembly 170 provided in the present embodiment does not affect the performance of the antenna on the third frame.

[0132] The number of the connecting assembly 170 can be set according to the antenna demand and the overall space, and one or more, such as 1 to 8, can be provided. When the connecting assembly 170 has multiple, they can be evenly arranged.

[0133] As shown in FIG. 24, FIG. 24 is a structural schematic diagram of a middle frame in a foldable terminal according to an embodiment of the present application. In some embodiments, the folding part includes a middle frame 110. As shown in FIG. 25, FIG. 25 is a partial enlarged structural schematic diagram at A in FIG. 24. The middle frame 110 includes a first frame body 111, a second frame body 112 and a third frame body 113 arranged in sequence. The first frame body 111 has a grounding structure 116. Specifically, the entire first frame body 111 can be the grounding structure 116, or a part of the first frame body 111 can be provided with the grounding structure 116. The second frame body 112 is an insulating frame body. The second frame body 112 surrounds the first frame body 111. The third frame body 113 surrounds the second frame body 112, and the third frame body 113 is provided with an antenna 140. Generally, the antenna 140 is generally provided with a plurality of antennas 140, and the plurality of antennas 140 are separated by an insulating material. A part of a flexible circuit board 171 is arranged on the second frame body 112 and / or the third frame body 113. Another part of the flexible circuit board 171 is electrically connected with the grounding structure 116. The middle frame 110 adopts the structure provided in the embodiment, so that the first frame body 111 with the grounding structure 116 and the third frame body 113 with the antenna 140 can be separated by the insulating frame body (i.e. the second frame body 112), so that the antenna 140 is not easily affected by the conductive structure on the first frame body 111, and the performance of the antenna 140 is stable. A part of the flexible circuit board 171 is arranged on the second frame body 112 and / or the third frame body 113, and another part of the flexible circuit board 171 is electrically connected with the grounding structure 116, so that at least a part of the flexible circuit board 171 is located outside the first frame body 111, so that the flexible circuit board 171 is not easily affected by other conductive structures on the first frame body 111 except the grounding structure 116, so that the structure and electrical performance of the folding part 10 are stable.

[0134] In some embodiments, the foldable terminal further comprises a limiting structure. The limiting structure comprises a first limiting part 114 and a second limiting part 115 cooperating with the first limiting part 114. The first limiting part 114 is arranged on the flexible circuit board 171. The second limiting part 115 is arranged on the second frame 112 and / or the third frame 113. The flexible circuit board 171 is mounted on a preset area on the second frame 112 and / or the third frame 113 through the second limiting part 115 and the first limiting part 114. The preset area refers to an area where the flexible circuit board 171 is expected to be mounted, which can be determined according to design and use needs. The first limiting part 114 and the second limiting part 115 can have various arrangements. For example, the first limiting part 114 can be a groove, and the second limiting part 115 can be a protrusion that cooperates with the groove; or the first limiting part 114 can be a plurality of blind holes, and the second limiting part 115 can be a plurality of protruding columns that cooperate with the blind holes, and so on. The arrangement of the first limiting part 114 and the second limiting part 115 allows the flexible circuit board 171 to be mounted in the preset area of the second frame 112, so that the assembly position of the flexible circuit board 171 is accurate, and the assembly consistency of different products is good.

[0135] In some embodiments, the first limiting part 114 comprises a protruding part protruding from the flexible circuit board 171. The second limiting part 115 comprises a groove arranged on the second frame 112 and / or the third frame 113. The protruding part cooperates with the groove in a plug-in manner.

[0136] The protruding part can be a protruding rib, a protruding piece, a protruding block, etc., which can be determined according to the shape and depth of the groove, and the mounting needs of the flexible circuit board 171, etc. The first limiting part 114 and the second limiting part 115 adopt the structure provided in the embodiments, which is simple in structure and easy to assemble. Meanwhile, the first limiting part 114 comprises a protruding part, which is used as a limiting structure and also as a reinforcing structure of the flexible circuit board 171, so that the mechanical strength of the flexible circuit board 171 is enhanced, and the risk of damage to the flexible circuit board 171 is reduced.

[0137] As shown in FIG. 22, in some embodiments, the protruding part comprises a strip-shaped part 1141. The length direction of the strip-shaped part 1141 is arranged at an angle to the length direction of the flexible circuit board 171. As shown in FIG. 26, which is a structure schematic view of a groove in a foldable terminal provided in the embodiments of the present application, the groove comprises a first groove body 1151 for accommodating the strip-shaped part 1141.

[0138] The strip-shaped part 1141 refers to a part with a length direction dimension greater than a width direction dimension and a thickness direction dimension. The angle setting refers to a non-zero angle setting, for example, the two parts can be set at 90° or other angles (for example, 45°, 40°, etc.). The length direction of the strip-shaped part 1141 is at an angle with the length direction of the flexible circuit board 171, which can prevent the flexible circuit board 171 from moving in the front, back, left and right directions after installation, so that the position of the connecting assembly 170 is stable, thereby stabilizing the connection between the coupling medium 310 and the grounding structure 116.

[0139] As shown in FIGS. 22 and 23, in some embodiments, the convex part further includes an arc-shaped part 1142 spaced from the strip-shaped part 1141. The arc-shaped part 1142 is used to support the flexible circuit board 171. As shown in FIG. 26, the groove includes a second groove body 1152. The second groove body 1152 is in communication with the first groove body 1151, and the second groove body 1152 is used to accommodate the arc-shaped part 1142 and at least part of the flexible circuit board 171.

[0140] The arc-shaped part 1142 is a part with a large area surface being an arc surface. The arc-shaped part 1142 is arranged to enable the flexible circuit board 171 to be bent and fitted on the arc-shaped part 1142, so as to shorten the length of the flexible circuit board 171, reduce the occupied space, and make the volume of the connecting assembly 170 smaller, thereby facilitating installation. Meanwhile, the arc-shaped part 1142 cooperates with the second groove body 1152 to enable the flexible circuit board 171 to be positioned in the depth direction of the second groove body 1152.

[0141] Tests show that the shell assembly and the foldable terminal provided in the embodiments of the present application can improve the influence on the antenna diaphragm by about 6-10 db, which is obvious and suitable for foldable terminals with three folding parts and more folding parts, and also suitable for foldable terminals with two folding parts. The shell assembly provided in any of the above embodiments is commonly known as a small A shell.

[0142] Finally, it should be noted that the above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or replacements within the technical scope disclosed in the present application should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A housing assembly for a foldable terminal, the foldable terminal having an unfolded state and a folded state, the foldable terminal comprising a plurality of folding portions sequentially rotatably connected by a pivot, at least one of the folding portions having the housing assembly, characterized in that, At least a portion of the housing assembly is a coupling medium for electromagnetic coupling with another fold and / or pivot disposed opposite to it in a folded state, and the coupling medium is electrically connected to the grounding structure of the fold.

2. The housing assembly according to claim 1, characterized in that, The housing assembly has a first side, a second side, and a third side connected in sequence, the first side and the third side being located on the same side of the second side, and the coupling medium having a first portion located on the first side, a second portion located on the second side, and a third portion located on the third side, the first portion and the third portion being connected through the second portion.

3. The housing assembly according to claim 2, characterized in that, The length of the first part is less than the length of the first side, and the length of the third part is less than the length of the third side.

4. The housing assembly according to any one of claims 1-3, characterized in that, The housing assembly further includes an insulating portion having a first side facing another of the folded portions and a second side disposed opposite to the first side; The coupling medium includes a metal layer, at least a portion of which is disposed on the first surface, and the metal layer is electrically connected to the grounding structure.

5. The housing assembly according to claim 4, characterized in that, The first surface includes a plane and a curved surface connected sequentially along a first direction, with a portion of the metal layer located on the plane and another portion extending to the curved surface.

6. The housing assembly according to claim 5, characterized in that, The portion of the metal layer located on the curved surface has a dimension greater than or equal to 1 mm in the first direction.

7. The housing assembly according to any one of claims 4-6, characterized in that, The thickness of the metal layer is greater than or equal to 5 micrometers.

8. The housing assembly according to any one of claims 4-6, characterized in that, The thickness of the metal layer is 5 micrometers to 10 micrometers; Alternatively, the thickness of the metal layer may be 5 micrometers to 20 micrometers.

9. The housing assembly according to any one of claims 4-8, characterized in that, The entire metal layer is disposed on the first surface of the insulating portion.

10. The housing assembly according to any one of claims 4-8, characterized in that, The metal layer has a first layer and a second layer that are connected to each other. The first layer is disposed on the first surface, and the second layer is disposed on the second surface of the insulating portion. At least one of the second layer and the first layer is electrically connected to the grounding structure.

11. The housing assembly according to any one of claims 4-10, characterized in that, The housing assembly further includes a first connector, which is embedded in the insulating portion and electrically connected to the metal layer. The first connector is used for electrical connection with the grounding structure.

12. The housing assembly according to claim 11, characterized in that, The first connector includes a first connecting part, a second connecting part, and a third connecting part connected in sequence. The first connecting part is in surface contact with a portion of the metal layer on the first surface, and the third connecting part is used to contact a portion of the metal layer on the second surface or the grounding structure surface.

13. The housing assembly according to claim 11 or 12, characterized in that, The first connector is formed by bending a sheet.

14. The housing assembly according to any one of claims 4-13, characterized in that, The metal layer includes a first nickel layer, a copper layer, and a second nickel layer stacked sequentially along its thickness direction.

15. The housing assembly according to any one of claims 1-3, characterized in that, The coupling medium includes a metal component; The housing assembly also includes an insulating portion disposed on the side of the metal portion away from the main display screen of the foldable terminal and connected to the metal portion.

16. The housing assembly according to claim 15, characterized in that, At least a portion of the metal portion overlaps with at least a portion of the insulating portion in the thickness direction of the housing assembly, and the two are connected by an adhesive layer.

17. The housing assembly according to claim 15, characterized in that, The metal part has a first plug-in portion, and the insulating part has a second plug-in portion adapted to the first plug-in portion. The insulating part is plugged into the metal part through the second plug-in portion and the first plug-in portion.

18. A foldable terminal, the foldable terminal having an unfolded state and a folded state, wherein in the folded state, the inner surface of the foldable terminal forms at least one cavity, characterized in that, The foldable terminal includes a first folding part and a second folding part, both of which have a grounding structure; In the folded state, the second fold is disposed opposite to the first fold, and at least one of the first and second folds is provided with a flexible display screen and a housing assembly as described in any one of claims 1-17 on the side facing the other fold, the housing assembly being disposed around the flexible display screen; an opening communicating between the cavity and the external space is formed between the housing assembly on one fold and the other fold.

19. The foldable terminal according to claim 18, characterized in that, In the width direction of the opening, the width of the coupling medium is approximately equal to the width of the opening.

20. The foldable terminal according to claim 18 or 19, characterized in that, The coupling medium is electrically connected to the grounding structure on the folded section via a connecting component.

21. The foldable terminal according to claim 20, characterized in that, The connection component includes a flexible circuit board disposed inside the coupling medium and electrically connected to the coupling medium and the grounding structure.

22. The foldable terminal according to claim 21, characterized in that, The flexible circuit board is electrically connected to the coupling medium via an elastic element.

23. The foldable terminal according to claim 21 or 22, characterized in that, The connection assembly further includes a second connector that connects the flexible circuit board and the grounding structure.

24. The foldable terminal according to any one of claims 21-23, characterized in that, The folding portion includes a middle frame, which includes a first frame, a second frame, and a third frame arranged sequentially. The first frame has the grounding structure. The second frame is an insulating frame and is arranged around the first frame. The third frame is arranged around the second frame and is provided with an antenna. A portion of the flexible circuit board is disposed on the second frame and / or the third frame, and another portion of the flexible circuit board is electrically connected to the grounding structure.

25. The foldable terminal according to claim 24, characterized in that, The foldable terminal further includes a limiting structure, which includes a first limiting part and a second limiting part that cooperates with the first limiting part. The first limiting part is disposed on the flexible circuit board, and the second limiting part is disposed on the second frame and / or the third frame. The flexible circuit board is mounted on a preset area on the second frame and / or the third frame through the second limiting part and the first limiting part.

26. The foldable terminal according to claim 25, characterized in that, The first limiting part includes a protrusion protruding from the flexible circuit board, and the second limiting part includes a groove provided on the second frame and / or the third frame, wherein the protrusion is inserted into the groove.

27. The foldable terminal according to claim 26, characterized in that, The protrusion includes a strip-shaped portion, the length direction of which is set at an angle to the length direction of the flexible circuit board; the groove includes a first groove body, which is used to accommodate the strip-shaped portion.

28. The foldable terminal according to claim 27, characterized in that, The protrusion also includes an arc-shaped portion spaced apart from the strip-shaped portion, the arc-shaped portion being used to support the flexible circuit board, and the groove includes a second groove body communicating with the first groove body, the second groove body being used to accommodate the arc-shaped portion and at least a portion of the flexible circuit board.

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