Shell assembly and terminal equipment

Abstract

The embodiment of the invention discloses a shell assembly and terminal equipment, relates to the technical field of antennas, and is used for solving the technical problem that a rear cover scheme of an existing mobile phone affects user experience. The shell assembly comprises a middle frame and a non-metal rear cover. The middle frame comprises a middle plate, a metal rear cover and a metal frame. The metal frame comprises a first frame and a second frame which are connected. The middle plate and the metal rear cover are arranged in the metal frame, the first frame is connected to the periphery of the middle plate, and the second frame is connected to the periphery of the metal rear cover. A groove is defined by the first frame, the middle plate and the metal rear cover, and the non-metal rear cover is buckled on the groove and connected with the middle frame. The metal rear cover is connected with the edge of the second frame, and the metal rear cover and the non-metal rear cover are located on the same side of the middle frame. According to the shell assembly, the experience feeling of a user is improved, and homogenization of appearance design is eliminated.

Description

Technical Field

[0001] The present application relates to the field of antenna technology, and in particular to a housing assembly and a terminal device. Background Art

[0002] At present, the back shell of a smartphone is separately attached to the frame. Due to the different materials of the back shell and the frame, a material seam will be generated between the back shell and the frame around the phone, which not only affects the user's grip, but also creates a sense of separation in the appearance of the phone, reducing the integrity of the device. In recent years, with the continuous evolution of mobile phone back shell solutions, the appearance of the back shell has also tended to be homogenized, making it difficult to bring a new appearance experience to consumers. However, if all or part of the back shell of a mobile phone is designed to be metal, it is easy to reduce the radiation performance of the mobile phone antenna, affecting the user experience. Summary of the invention

[0003] The embodiments of the present application provide a housing assembly and a terminal device, which are used to solve the technical problem that the back cover solution of the current mobile phone affects the user experience.

[0004] In order to achieve the above objectives, this application adopts the following technical solutions:

[0005] According to a first aspect of an embodiment of the present application, a shell assembly is provided, which includes a middle frame and a non-metallic back cover. The middle frame includes a middle plate, a metal back cover and a metal frame, and the metal frame includes a first frame and a second frame connected to each other. The middle plate and the metal back cover are arranged in the metal frame, the first frame is connected to the periphery of the middle plate, and the second frame is connected to the periphery of the metal back cover. The first frame, the middle plate and the metal back cover are surrounded by a groove, and the non-metallic back cover is buckled on the groove and connected to the middle frame. The metal back cover is connected to the edge of the second frame, and the metal back cover and the non-metallic back cover are located on the same side of the middle frame. Among them, the first frame includes a first radiator with an operating frequency band of 600MHz-1000MHz, the second frame includes a second radiator with an operating frequency band of more than 1700MHz, the second frame does not include the first radiator, and a second slot is arranged between the second radiator and the metal back cover.

[0006] As can be seen from the above, the embodiment of the present application adopts a frame and a back cover made of metal materials. The second frame in the metal frame is connected to the periphery of the metal back cover, and the metal back cover is connected to the edge of the second frame, which can eliminate the material seam between the back cover and the frame due to different materials, so that the metal back cover and the second frame maintain the integrity of the device in appearance, which is conducive to improving the user's grip. At the same time, the connected metal back cover and metal frame can also improve the structural strength of the shell assembly, thereby increasing the anti-drop performance of the mobile phone. The first frame in the metal frame is connected to the periphery of the middle plate, and the first frame, the middle plate and the metal back cover are surrounded by a groove for connecting the non-metallic back cover, and the metal back cover and the non-metallic back cover are located on the same side of the middle frame, so that the metal back cover and the non-metallic back cover can be used as the appearance surface of the shell assembly, thereby forming a back cover solution in which the back covers of the two materials are combined, and the junction of the back covers of the two materials can be designed as different graphics, thereby enriching the diversity of the back cover appearance design.

[0007] In addition, the embodiment of the present application arranges the first radiator (a low-frequency antenna with an operating frequency band of 600MHz-1000MHz) on the first frame, so that the low-frequency antenna is located in the area of ​​the non-metallic back cover. Since the non-metallic back cover does not reduce the radiation performance of the antenna, the influence of the metal back cover on the radiation performance of the low-frequency antenna is avoided, and there is no need to make grooves on the non-metallic back cover. At the same time, the second groove between the second radiator (a medium- and high-frequency antenna with an operating frequency band of more than 1700MHz) and the metal back cover allows the medium- and high-frequency antenna to remain in the area of ​​the metal back cover. In addition, since the low-frequency antenna is no longer arranged on the second frame, the low-frequency antenna and the medium- and high-frequency antenna do not need to be arranged on the second frame at the same time, but only the medium- and high-frequency antenna need to be arranged on the second frame. Therefore, the arrangement length of the medium- and high-frequency antenna can be increased, thereby improving the radiation performance of the medium- and high-frequency antenna.

[0008] In some embodiments, the outline of the middle frame is a rectangle, and the outline of the middle frame has two oppositely arranged side edges and two oppositely arranged bottom edges, and the length of the side edge is greater than the length of the bottom edge. The first radiator is arranged on the side edge, and the second radiator is arranged on the bottom edge. Thus, the length of the side edge of the middle frame is greater than the length of the bottom edge, and the first radiator is arranged on the side edge of the middle frame, and the second radiator is arranged on the bottom edge of the middle frame, so that the length of the first radiator can be greater than the length of the second radiator. Usually, the length of the low-frequency antenna is greater than the length of the medium- and high-frequency antennas, so the first radiator can be used as a low-frequency antenna, and the second radiator can be used as a medium- and high-frequency antenna. In addition, the second radiator is arranged on the bottom edge of the middle frame, so that the second slot between the second radiator and the metal back cover is also located at the bottom edge of the middle frame, avoiding slotting on the side edge of the middle frame, reducing the slot area between the metal back cover and the metal frame, thereby improving the sense of unity between the metal back cover and the metal frame, and enhancing the refinement of the appearance of the shell assembly.

[0009] In some embodiments, at least a portion of the middle plate is a metal plate, and a first slot is provided between the first radiator and the metal plate. The first frame includes a first ground terminal and a first break that separates the first frame, and the first slot is connected to the first break. One end of the first radiator is electrically connected to the first ground terminal and is grounded through the first ground terminal, and the first ground terminal is close to the second frame. The other end of the first radiator is located at the first break, and the first break is away from the second frame. Therefore, in the case where the first radiator is arranged on the side of the middle frame, in order to avoid the influence of the user's ear on the low-frequency antenna when making a call, it is necessary to set the first break at a position away from the bottom edge of the first frame. At this time, setting the first ground terminal at a position close to the second frame can make the first radiator have a longer length, thereby meeting the radiation requirements of the low-frequency antenna.

[0010] In some embodiments, the first frame further includes a third radiator and a second slit separating the first frame, a third slot is provided between the third radiator and the metal plate, the third slot is connected to the first slot, the second slit is provided on a side of the first slit away from the first grounding end, and the second slit is connected to the third slot. One end of the third radiator is located at the first slit, and the other end of the third radiator is located at the second slit. Thus, the second slit is provided on a side of the first slit away from the first grounding end, and the third slot is connected to the first slot, so that the third radiator can be provided on a side of the first radiator away from the second frame. When the length of the first radiator cannot meet the radiation requirements of the low-frequency antenna, the provision of the third radiator can increase the radiation performance of the low-frequency antenna, thereby complementing the radiation performance of the low-frequency antenna of the first radiator.

[0011] In some embodiments, the first radiator further includes a first resonant switch, one end of the first resonant switch is electrically connected to the first radiator, and the other end of the first resonant switch is electrically connected to the third radiator. Thus, the resonant frequency of the first radiator and the third radiator can be adjusted by controlling the conduction or cutoff of the first resonant switch, and the bandwidth of the low-frequency antenna can be adjusted by adjusting the resonant frequency of the first radiator and the third radiator, so that the low-frequency antenna can cover more working frequency bands.

[0012] In some embodiments, the first frame further includes a fourth radiator, and a fourth slot is provided between the fourth radiator and the metal plate. The first frame includes a second ground terminal and a third slit that separates the first frame, and the fourth slot is connected to the third slit. One end of the fourth radiator is electrically connected to the second ground terminal and is grounded through the second ground terminal, and the second ground terminal is close to the second frame. The other end of the fourth radiator is located at the third slit, and the third slit is far away from the second frame. The first radiator and the fourth radiator are respectively arranged on two sides. Thus, two low-frequency antennas can be respectively arranged on the two sides of the first frame, and the two low-frequency antennas are respectively a low-frequency main antenna and a low-frequency diversity antenna, and the low-frequency diversity antenna can play a complementary role in the radiation performance of the low-frequency main antenna. Among them, at least one of the first radiator and the third radiator in the above embodiment can be used as a low-frequency main antenna. The fourth radiator can be used as a low-frequency diversity antenna. Similar to the above embodiment, when the fourth radiator is arranged on the side of the middle frame, in order to avoid the influence of the user's ear on the low-frequency antenna when making a call, the third slit needs to be arranged at a position away from the bottom edge of the first frame. At this time, setting the second ground end at a position close to the second frame can make the fourth radiator have a longer length, thereby meeting the radiation requirement of the low-frequency antenna.

[0013] In some embodiments, the first frame further includes a fifth radiator and a fourth slit separating the first frame, a fifth slot is provided between the fifth radiator and the metal plate, the fifth slot is connected to the fourth slot, the fourth slot is provided on the side of the third slot away from the second grounding end, and the fourth slot is connected to the fifth slot. One end of the fifth radiator is located at the third slit, and the other end of the fifth radiator is located at the fourth slit. Thus, similar to the above embodiment, the fourth slit is provided on the side of the third slit away from the second grounding end, and the fifth slot is connected to the fourth slot, so that the fifth radiator can be provided on the side of the fourth radiator away from the second frame. When the length of the fourth radiator cannot meet the radiation requirements of the low-frequency diversity antenna, the provision of the fifth radiator can increase the radiation performance of the low-frequency diversity antenna, thereby complementing the radiation performance of the low-frequency diversity antenna of the fourth radiator.

[0014] In some embodiments, the fourth radiator further includes a second resonant switch. One end of the second resonant switch is electrically connected to the fourth radiator, and the other end of the second resonant switch is electrically connected to the fifth radiator. Thus, similar to the above embodiment, the resonant frequency of the fourth radiator and the fifth radiator can be adjusted by controlling the conduction or cutoff of the second resonant switch, and the bandwidth of the low-frequency antenna can be adjusted by adjusting the resonant frequency of the fourth radiator and the fifth radiator, so that the low-frequency antenna can cover more working frequency bands.

[0015] In some embodiments, the length L of the first radiator 1>40mm. When the length of the low-frequency antenna is greater than 40mm, it can cover the operating frequency band of 600MHz-1000MHz.

[0016] In some embodiments, the second frame includes a third ground terminal and a fifth fracture that separates the second frame, and the second slot is connected to the fifth fracture. One end of the second radiator is electrically connected to the third ground terminal and is grounded through the third ground terminal, and the third ground terminal is close to one end of the bottom edge. The other end of the second radiator is located at the fifth fracture, and the fifth fracture is close to the other end of the bottom edge. Therefore, when the second slot between the second radiator (medium and high frequency antenna) and the metal back cover is arranged at the bottom edge of the second frame, the second slot and the fifth fracture can form an approximately L-shaped shape at the bottom edge of the second frame, thereby enriching the appearance design of the shell assembly.

[0017] In some embodiments, the second frame includes a third ground terminal and a fifth fracture that separates the second frame, and the second slot is connected to the fifth fracture. One end of the second radiator is electrically connected to the third ground terminal and is grounded through the third ground terminal, and the third ground terminal is close to one end of the bottom edge. The other end of the second radiator is located at the other end of the bottom edge. Therefore, when the second slot between the second radiator (medium and high frequency antenna) and the metal back cover is arranged at the bottom edge of the second frame, the second slot and the fifth fracture can also form a T-shaped shape at the bottom edge of the second frame, thereby enriching the appearance design of the shell assembly.

[0018] In some embodiments, the second frame includes two third ground terminals and two fifth breaks that separate the second frame, and the second slot is connected to the two fifth breaks. The two ends of the second radiator are electrically connected to the two third ground terminals respectively, and are grounded through the third ground terminals, and the two third ground terminals are symmetrically arranged at the two ends of the bottom edge. The two fifth breaks are symmetrically arranged between the two third ground terminals. Thus, when the second slot between the second radiator (medium and high frequency antenna) and the metal back cover is arranged at the bottom edge of the second frame, the second slot and the two fifth breaks can also form an approximately π-shaped shape at the bottom edge of the second frame. In addition, the two fifth breaks can be symmetrically arranged on the bottom edge of the second frame, and the second slot can also be symmetrically arranged on the bottom edge of the second frame, thereby improving the sophistication of the product appearance.

[0019] In some embodiments, the second frame includes a third ground terminal and two fifth breaks that separate the second frame, and the second slot is connected to the two fifth breaks. The second radiator is electrically connected to the third ground terminal and is grounded through the third ground terminal. The two ends of the second radiator are respectively located at the two fifth breaks, and the two fifth breaks are symmetrically arranged at the two ends of the bottom edge. Thus, when the second slot between the second radiator (medium and high frequency antenna) and the metal back cover is arranged at the bottom edge of the second frame, the second slot and the two fifth breaks can also form a shape similar to a door frame at the bottom edge of the second frame. In addition, the two fifth breaks can be symmetrically arranged on the bottom edge of the second frame, and the second slot can also be symmetrically arranged on the bottom edge of the second frame, thereby improving the refinement of the product appearance.

[0020] In some embodiments, the second frame also includes a sixth radiator connected to the second radiator, a sixth slot is provided between the sixth radiator and the metal back cover, and the sixth slot is connected to the second slot. The second frame includes a third ground terminal and two fifth breaks that separate the second frame, and the second slot is connected to the two fifth breaks. At least one of the second radiator and the sixth radiator is electrically connected to the third ground terminal and grounded through the third ground terminal, and the two sixth slots are symmetrically arranged on the two side edges; the two fifth breaks are symmetrically arranged on the bottom edge. Thus, on the basis that the second slot between the second radiator (medium and high frequency antenna) and the metal back cover is arranged on the bottom edge of the second frame, a sixth slot can also be provided between the two side edges of the second frame and the metal back cover, and the sixth slot is connected to the second slot, so that the second slot, the sixth slot and the two fifth breaks are symmetrical about the midline of the bottom edge of the second frame, thereby improving the refinement of the product appearance.

[0021] In some embodiments, the second frame further includes a sixth radiator connected to the second radiator, a sixth slot is provided between the sixth radiator and the metal back cover, and the sixth slot is connected to the second slot. The second frame includes a third ground terminal and four fifth slits that separate the second frame, the second slot is connected to the two fifth slits, and the sixth slot is connected to the two fifth slits. At least one of the second radiator and the sixth radiator is electrically connected to the third ground terminal and grounded through the third ground terminal, and the two sixth slots are symmetrically arranged on the two side edges; the two fifth slits are symmetrically arranged on the two side edges, and the two fifth slits are symmetrically arranged on the bottom edge. Thus, on the basis that the second slot between the second radiator (medium and high frequency antenna) and the metal back cover is arranged on the bottom edge of the second frame, a sixth slot can also be provided between the two side edges of the second frame and the metal back cover, and the sixth slot is connected to the second slot. In addition, a fifth slit is added to each of the two side edges of the second frame, so that the second slot, the sixth slot and the four fifth slits are symmetrical about the midline of the bottom edge of the second frame, thereby improving the refinement of the product appearance.

[0022] In some embodiments, the length L of the second radiator2 <30mm. When the length of the medium and high frequency antenna is less than 30mm, it can cover the operating frequency band above 1700MHz.

[0023] In some embodiments, the shell assembly also includes a charging interface, and the first frame also includes a plurality of seventh radiators, and the operating frequency band of the seventh radiator is above 1700MHz. The charging interface is arranged at the bottom edge of the second frame, a part of the seventh radiator is arranged on the side of the first frame, and close to the bottom edge of the first frame, and another part of the seventh radiator is arranged at the bottom edge of the first frame. Thus, the seventh radiator can be a non-cellular antenna such as Bluetooth (BT), Wireless Fidelity (Wi-Fi), and Global Positioning System (GPS). These non-cellular antennas can be arranged at the bottom edge of the first frame or on the side close to the bottom edge, so as to improve the radiation performance of the non-cellular antenna. In this way, the low-frequency antenna is arranged between the second frame and the seventh radiator, and when the user makes a call, the influence of the user's head and palm on the low-frequency antenna can be avoided.

[0024] In some embodiments, the ratio of the vertical projection area of ​​the metal back cover on the middle frame to the area of ​​the middle frame is greater than 0.15. Therefore, the larger the area of ​​the metal back cover, the less likely it is for the palm of the user to extend beyond the area where the metal back cover is located when the user holds the shell assembly, thereby avoiding the influence of the palm on the low-frequency antenna in the non-metal back cover area. In addition, the larger the area of ​​the metal back cover, the sufficient structural strength between the metal back cover and the second frame is, and the anti-drop performance of the shell assembly is improved. At the same time, it is also conducive to improving the recognition of the appearance of the shell assembly.

[0025] In some embodiments, the metal back cover and the second frame are made of the same material, and the metal back cover and the second frame are connected to form an integral structure, thereby improving the material and structural integrity between the metal back cover and the second frame, thereby improving the structural strength of the housing assembly and improving the drop resistance of the housing assembly.

[0026] In some embodiments, the non-metallic back cover has a first interface on one side close to the metal back cover, and the metal back cover has a second interface on one side close to the non-metal back cover, and the first interface and the second interface are fitted to form a boundary line. The boundary line is a straight line, a curve, or a broken line. Thus, the back cover of the housing assembly can be designed in a variety of different patterns, enriching the appearance of the housing assembly.

[0027] In a second aspect of the embodiments of the present application, a terminal device is provided, the terminal device comprising a display screen and a housing assembly in any of the above embodiments, the display screen being connected to the housing assembly. The housing assembly in the terminal device has the same technical effect as the housing assembly in any of the above first aspects, and will not be described in detail here.

[0028] In some embodiments, the terminal device further includes a wireless charging coil, which is mounted on the middle plate of the housing assembly. Thus, the wireless charging coil can avoid the area where the metal back cover is located, thereby realizing the wireless charging function of the terminal device and reducing the influence of the metal back cover on the charging efficiency of the wireless charging coil. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 A schematic diagram of the three-dimensional structure of the screen side of a terminal device provided in an embodiment of the present application;

[0030] Figure 2 A schematic diagram of the three-dimensional structure of a rear shell side of a terminal device provided in an embodiment of the present application;

[0031] Figure 3 for Figure 2 A schematic diagram of the exploded structure of the housing assembly of the terminal device;

[0032] Figure 4 for Figure 3 AA cross-sectional structural diagram of the middle shell assembly;

[0033] Figure 5 for Figure 4 A schematic diagram of the enlarged structure of the connection between the non-metal back cover and the metal back cover at A;

[0034] Figure 6 Schematic diagram of the implementation structure of the boundary line between the non-metal back cover and the metal back cover Figure 1 ;

[0035] Figure 7 Schematic diagram of the implementation structure of the boundary line between the non-metal back cover and the metal back cover Figure 2 ;

[0036] Figure 8 Schematic diagram of the implementation structure of the boundary line between the non-metal back cover and the metal back cover Figure 3 ;

[0037] Fig. 9 Schematic diagram of the implementation structure of the boundary line between the non-metal back cover and the metal back cover Figure 4 ;

[0038] Fig.10 Schematic diagram of the implementation structure of the boundary line between the non-metal back cover and the metal back cover Figure 5 ;

[0039] Fig.11 Schematic diagram of the implementation structure of the boundary line between the non-metal back cover and the metal back cover Figure 6 ;

[0040] Fig.12 Schematic diagram of the implementation structure of the boundary line between the non-metal back cover and the metal back cover Figure 7 ;

[0041] Fig.13 Schematic diagram of the implementation structure of the boundary line between the non-metal back cover and the metal back cover Figure 8 ;

[0042] Fig.14 Schematic diagram of the implementation structure of the boundary line between the non-metal back cover and the metal back cover Figure 9 ;

[0043] Fig.15 for Figure 3 A schematic diagram of the three-dimensional structure of the middle frame in the housing assembly;

[0044] Fig.16 for Figure 3 A schematic diagram of the structure in which a wireless charging coil is installed in a housing assembly;

[0045] Fig.17 for Fig.15 BB cross-sectional structure diagram of the middle frame Figure 1 ;

[0046] Fig.18 for Fig.15 BB cross-sectional structure diagram of the middle frame Figure 2 ;

[0047] Fig.19 for Fig.15 A CC cross-sectional structural diagram of the middle frame in FIG.

[0048] Fig. 20 A schematic diagram of a top view of a housing assembly provided in an embodiment of the present application;

[0049] Fig.21 It is a schematic diagram of the three-dimensional structure of the rear shell side of the terminal device in the related art;

[0050] Fig. 22 A schematic diagram of the decomposed structure of a terminal device provided in an embodiment of the present application;

[0051] Fig.23 for Fig. 22 A schematic diagram of the structure of the frame antenna in the housing assembly;

[0052] Fig.24A schematic diagram of an application scenario of a terminal device provided in an embodiment of the present application Figure 1 ;

[0053] Fig.25 A schematic diagram of an application scenario of a terminal device provided in an embodiment of the present application Figure 2 ;

[0054] Fig.26 for Fig.23 Schematic diagram of the structure of the medium and low frequency main antenna Figure 1 ;

[0055] Fig. 27 for Fig.23 Schematic diagram of the structure of the medium and low frequency main antenna Figure 2 ;

[0056] Fig.28 for Fig.23 Structural diagram of the layout of the medium and low frequency diversity antenna Figure 1 ;

[0057] Fig.29 for Fig.23 Structural diagram of the layout of the medium and low frequency diversity antenna Figure 2 ;

[0058] Fig.30 for Fig.23 Structural diagram of the layout of the medium and low frequency diversity antenna Figure 3 ;

[0059] Fig.31 for Fig.23 Structural diagram of the layout of the medium and low frequency diversity antenna Figure 4 ;

[0060] Fig.32 for Fig.31 Schematic diagram of the structure of medium and low frequency diversity antenna Figure 1 ;

[0061] Fig.33 for Fig.31 Schematic diagram of the structure of medium and low frequency diversity antenna Figure 2 ;

[0062] Fig.34 for Fig.23 A structural schematic diagram of the arrangement position of the fifth radiator of the medium and high frequency antenna;

[0063] Fig.35 for Fig.23 Schematic diagram of the structure of the medium and high frequency main antenna on the shell assembly Figure 1 ;

[0064] Fig.36 for Fig.23 Schematic diagram of the structure of the medium and high frequency main antenna on the shell assembly Figure 2 ;

[0065] Fig.37 for Fig.23 Schematic diagram of the structure of the medium and high frequency main antenna on the shell assembly Figure 3 ;

[0066] Fig.38 for Fig.23 Schematic diagram of the structure of the medium and high frequency main antenna on the shell assembly Figure 4 ;

[0067] Fig.39 for Fig.23 Schematic diagram of the structure of the medium and high frequency main antenna on the shell assembly Figure 5 ;

[0068] Fig.40 for Fig.23 Schematic diagram of the structure of the medium and high frequency main antenna on the shell assembly Figure 6 ;

[0069] Fig.41 for Fig.23 Current distribution diagram of the medium-low frequency main antenna and the medium-high frequency main antenna;

[0070] Fig.42 for Fig.23 System efficiency curves of mid-low frequency main antenna and mid-high frequency main antenna;

[0071] Fig.43 for Fig.23 S11 parameter curves of the medium-low frequency main antenna and the medium-high frequency main antenna;

[0072] Fig.44 A schematic diagram of the structure of the frame antenna in the shell assembly of the related art Figure 1 ;

[0073] Fig.45 A schematic diagram of the structure of the frame antenna in the shell assembly of the related art Figure 2 .

[0074] Reference numerals:

[0075] 01-terminal device; 10-middle frame 100; 20-back shell; 30-display screen; 40-earpiece; 50-charging port; 60-material joint; 70-main circuit board; 80-battery; 90-secondary circuit board; 02-housing assembly; 100-middle frame; 101-side; 101a-left side; 101b-right side; 102-bottom; 102a-lower bottom; 102b-upper bottom; 110-middle plate ; 111-metal plate; 112-dielectric plate; 113-groove; 120-metal back cover; 121-second interface; 122-chamfer; 130-metal frame; 131-first frame; 131a-low-frequency main antenna; 131b-first non-cellular antenna; 131c-second non-cellular antenna; 131d-first medium-high frequency multi-input / output antenna; 131e-second medium-high frequency multi-input / output antenna; 13 1f-medium and high frequency diversity antenna; 131g-low frequency diversity antenna; 131h-isolation gap; 131i-low frequency diversity branch line; 132-second frame; 200-non-metal back cover; 210-first interface; 220-boundary line; 1-first radiator; 1c-first slot; 1d-first gap; 1j-first ground terminal; 1x-first resonant switch; 1k-first feeding terminal; 2-second radiator; 2c-second slot; 2d-second gap; 2j-second ground terminal; 2x-second resonant switch; 2k-second feeding terminal; 3-third radiator; 3c-third slot; 3d-third gap; 3j-third ground terminal; 4-fourth radiator; 4c-fourth slot; 4d-fourth gap; 5-fifth radiator; 5c-fifth slot; 5d-fifth gap; 6-sixth radiator; 6c-sixth slot; 7-seventh radiator; Z 1 -First branch; Z 2 -Second branch; Z 3 -The third branch. DETAILED DESCRIPTION

[0076] In order to make the objectives, technical solutions and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings.

[0077] In the following, the terms "first", "second", etc. are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0078] In addition, in the present application, directional terms such as "upper" and "lower" are defined relative to the orientation of the components in the drawings. It should be understood that these directional terms are relative concepts. They are used for relative description and clarification, and they can change accordingly according to the changes in the orientation of the components in the drawings.

[0079] This embodiment of the application provides a terminal device 01. Figure 1 As shown, the terminal device 01 can be an electronic product such as a mobile phone, a tablet computer, an e-reader, a laptop computer, a wearable device, etc. The present application embodiment does not impose any special restrictions on the specific type of the terminal device 01. In order to better illustrate the content of the present application embodiment, the terminal device 01 is a mobile phone as an example for description.

[0080] The above terminal device 01, such as Figure 1 As shown, the terminal device 01 may include components such as a middle frame 100, a rear shell 20, and a display screen 30. The middle frame 100 may surround the periphery of the display screen 30, and the display screen 30 and the middle frame 100 may be connected by pasting. The rear shell 20 of the middle frame 100 may be connected to the middle frame 100 on the side of the middle frame 100 away from the display screen 30. Among them, the terminal device 01 may also include a handset 40 and a charging interface 50. The handset 40 may be arranged on the side of the display screen 30 of the terminal device 01 for making and receiving calls. The charging interface 50 may be arranged on the middle frame 100 for inserting a charging device when the terminal device 01 is charged. The embodiment of the present application does not impose any special restrictions on the specific structure of the terminal device 01. The handset 40 and the charging interface 50 are usually located at the upper and lower ends of the terminal device 01. For the convenience of description below, the end of the terminal device 01 where the handset 40 is located may be referred to as the upper part, and the end of the terminal device 01 where the charging interface 50 is located may be referred to as the lower part.

[0081] Based on this, Figure 1 As shown, the terminal device 01 may have a length direction, a width direction, and a thickness direction. For the convenience of explanation, the following embodiments will take the X direction as the length direction of the terminal device 01, the Y direction as the width direction of the terminal device 01, and the Z direction as the thickness direction of the terminal device 01 to illustrate the terminal device 01. Taking a mobile phone as an example, the outline of the middle frame 100 of the mobile phone can be a rectangle, the direction where the long side is located is the length direction of the mobile phone, and the direction where the short side is located is the width direction of the mobile phone.

[0082] In order to improve the user experience, the present application embodiment provides a housing component 02, such as Figure 2 As shown, the housing assembly 02 may include a middle frame 100 and a non-metallic back cover 200. The non-metallic back cover 200 may be connected to a side surface of the middle frame 100 along the Z direction to serve as the appearance surface of the housing assembly 02. Figure 1 The housing assembly 02 may be connected to the other side of the middle frame 100 along the Z direction. In order to better illustrate the embodiment of the present application, the specific structure of the housing assembly 02 will be described in detail below.

[0083] In the above-mentioned housing assembly 02, as Figure 3 As shown, the middle frame 100 may include a middle plate 110, a metal back cover 120 and a metal frame 130, wherein the middle plate 110 and the metal back cover 120 are connected within the range of the metal frame 130, and the middle plate 110 is located at the upper part of the metal frame 130, and the metal back cover 120 is located at the lower part of the metal frame 130. The middle plate 110 and the metal back cover 120 may be directly connected or indirectly connected through an insulating material. The embodiment of the present application does not impose any special restrictions on the connection method between the middle plate 110 and the metal back cover 120.

[0084] For example, Figure 4 As shown, Figure 3 AA cross-sectional view in. The middle plate 110 and the metal back cover 120 may be an integrally formed structure or a structure connected by welding, riveting or screwing. In addition, the cross-sectional surface of the middle plate 110 and the metal back cover 120 may be a smooth curved surface or a stepped surface. The embodiment of the present application does not impose any special restrictions on the connection method between the middle plate 110 and the metal back cover 120.

[0085] In some embodiments, Figure 5 As shown, Figure 4 The enlarged structure diagram of A in the figure. Figure 5 The state shown is the state when the metal back cover 120 and the non-metal back cover 200 are not attached. The non-metal back cover 200 has a first interface 210 on the side facing the metal back cover 120, and the metal back cover 120 has a second interface 121 on the side facing the non-metal back cover 200. When the non-metal back cover 200 is assembled, the first interface 210 can be attached to the second interface 121 to form a Figure 2 Junction line 220 is shown.

[0086] Of course, the boundary line 220 can be a straight line between the non-metallic back cover 200 and the metal back cover 120. In order to enrich the appearance of the housing assembly 02, the boundary line 220 can also be designed as other curves or broken lines. Some graphics of the boundary line 220 will be shown below, but the embodiment of the present application does not impose any special restrictions on the specific graphics of the boundary line 220.

[0087] For example, Figure 6As shown, the boundary line 220 between the non-metallic back cover 200 and the metal back cover 120 can also be designed as two line segments, and the two line segments intersect to form a fold line with an opening shape, and the opening of the fold line can be toward the upper part of the metal frame 130. The two line segments can be symmetrically arranged about the central axis aa of the metal frame 130, or can be asymmetrically arranged.

[0088] For example, Figure 7 As shown, different from the above embodiment, the opening of the fold line formed by the intersection of two line segments can be oriented toward the lower part of the metal frame 130 .

[0089] For example, Figure 8 As shown, the boundary line 220 between the non-metallic back cover 200 and the metal back cover 120 can also be designed as an arc segment, the arc segment has an opening, the opening of the arc segment can face the upper part of the metal frame 130, and the arc segment can be symmetrically arranged about the central axis aa of the shell assembly 02.

[0090] For example, Fig. 9 As shown, different from the above embodiment, the opening of the arc segment can also be directed toward the lower part of the metal frame 130 .

[0091] For example, Fig.10 As shown, the boundary line 220 between the non-metallic back cover 200 and the metal back cover 120 can also be designed as three line segments, and the three line segments are sequentially connected to form a fold line with an opening shape, and the opening of the fold line can be toward the upper part of the metal frame 130. The fold line formed by connecting the three line segments can be symmetrically arranged about the central axis aa of the metal frame 130, or it can be asymmetrical. Of course, the number of line segments of the fold line can also be designed to be more, and the embodiment of the present application does not impose any special restrictions on the number of lines of the fold line.

[0092] For example, Fig.11 As shown, different from the above embodiment, the opening of the fold line formed by connecting three line segments in sequence can also be oriented toward the lower part of the metal frame 130 .

[0093] For example, Fig.12 As shown, the boundary line 220 between the non-metallic back cover 200 and the metal back cover 120 can also be designed as an oblique line, and the inclination direction of the oblique line can be inclined upward along the Y direction, or can be inclined downward along the Y direction. The inclination angle α between the oblique line and the metal frame 130 can be 15°, 30°, or 45°. The embodiment of the present application does not impose any special restrictions on the inclination direction and inclination angle of the oblique line.

[0094] For example, Fig.13As shown, the boundary line 220 between the non-metallic back cover 200 and the metal back cover 120 can also be designed as an asymmetric arc segment about the central axis aa of the metal frame 130. The asymmetric arc segment has an opening, and the opening can be toward the upper part of the metal frame 130 or toward the lower part of the metal frame 130.

[0095] For example, Fig.14 As shown, the boundary line 220 between the non-metallic back cover 200 and the metal back cover 120 can also be designed as a wavy line, and the number of crests and troughs of the wavy line can be one or more. The embodiment of the present application does not impose any special restrictions on the number of crests and troughs.

[0096] Among them, according to the different models and functions of the terminal device 01, the above-mentioned different shapes of the boundary line 220 can be used. Taking a mobile phone as an example, for example, a business mobile phone can use a straight or oblique boundary line 220, and a gaming mobile phone can use a broken line or a wavy boundary line 220 to improve the appearance recognition of the terminal device 01. The embodiment of the present application does not impose special restrictions on the specific scene of the shape of the boundary line 220 selected in the terminal device 01. Of course, according to the different graphics of the boundary line 220 between the non-metallic back cover 200 and the metal back cover 120, the non-metallic back cover 200 and the metal back cover 120 can also be set to different colors. At the same time, the non-metallic back cover 200 and the metal back cover 120 can also be set to different materials. For example, the non-metallic back cover 200 can be made of materials such as ceramics, plastics or glass. The metal back cover 120 can be made of materials such as stainless steel, aluminum alloy or magnesium alloy. In this way, the combination of different design schemes of the non-metallic back cover 200 and the metal back cover 120 can significantly improve the appearance recognition of the housing component 02.

[0097] The above is an introduction to the diagram of the boundary line 220 between the non-metal back cover 200 and the metal back cover 120. The following will continue to introduce the specific structure of the middle frame 100 in detail. Fig.15 As shown, the middle plate 110 may include a metal plate 111 and a dielectric plate 112 connected to each other, and the connection method may be riveting, screwing or bonding. The dielectric plate 112 may be arranged at the periphery of the metal plate 111, or may be arranged within the range of the metal plate 111. Of course, the middle plate 110 may also be entirely set as the metal plate 111. Among them, the metal plate 111 may be used as the terminal device 01 ( Figure 1The metal plate 111 and the dielectric plate 112 can both be used to support components such as circuit boards in the terminal device 01. In addition, according to different requirements for the electrical performance of electronic devices inside the terminal device 01, such as the need to adjust the radiation frequency of the antenna in the terminal device 01, the dielectric plate 112 can be set to different shapes and positions, or dielectric plate 112 materials with different dielectric constants can be selected. According to the different structures of the components in the terminal device 01, a plurality of dielectric plates 112 can be provided, and mounting holes that penetrate the dielectric plates can be opened on the dielectric plates 112 for components to pass through the middle plate 110, such as electronic components such as chips or camera modules that need to be installed in the terminal device 01. The embodiment of the present application does not impose any special restrictions on the specific structure of the middle plate 110.

[0098] Among them, Fig.15 As shown, along the Z direction, there can be a height difference between the middle plate 110 and the metal back cover 120, and the metal frame 130, the middle plate 110 and the metal back cover 120 can surround a groove 113, and the middle plate 110 can serve as the bottom of the groove 113. In the figure, the hollow parts such as the groove and the hole are marked with a marking line with an arrow, and the other parts are marked with a marking line without an arrow. The same marking method will be used in the drawings of the following embodiments, and it will not be repeated. In this way, the non-metal back cover 200 ( Figure 3 The middle plate 110 and the non-metallic back cover 200 may be buckled on the groove 113 and connected to the middle frame 100. The groove 113 may be used to accommodate electronic devices such as circuit boards, batteries, and camera modules of the terminal device 01. The embodiment of the present application does not impose any special restrictions on the specific use of the groove 113. Depending on the different components installed in the housing assembly 02, there may or may not be a gap between the middle plate 110 and the non-metallic back cover 200.

[0099] For example, Fig.16 As shown, terminal device 01 ( Figure 1 The wireless charging coil 300 may be installed in the area where the non-metal back cover 200 is located in the housing assembly 02. Fig.15 The height difference between the non-metallic back cover 200 and the metal back cover 120 is reduced, thereby increasing the depth of the groove 113, so that the wireless charging coil 300 can be installed in the groove 113. At the same time, since the wireless charging coil 300 is located in the area where the non-metallic back cover 200 is located, the non-metallic back cover 200 will not affect the charging electromagnetic waves, so that the wireless charging coil 300 can also avoid the area where the metal back cover 120 is located, thereby realizing the wireless charging function, and will not affect the charging efficiency of the wireless charging coil 300.

[0100] In some embodiments, Fig.17 As shown, Fig.15 BB cross-sectional view in FIG. Along the Y direction, both ends of the non-metal back cover 200 can be installed on the inner side of the metal frame 130. In this way, from the housing component 02 ( Fig.16 The side of the non-metal back cover 200 and the metal frame 130 no longer shows the material seam 60 ( Fig.21 Of course, if Fig.18 As shown, the same Fig.15 The difference is that along the Y direction, the surface of the non-metallic back cover 200 away from the middle plate 110 can also be set to a curved surface to increase the user's grip.

[0101] In other embodiments, Fig.19 As shown, Fig.15 CC cross-sectional view in FIG. Along the Y direction, chamfers 122 can be set between the two ends of the metal back cover 120 and the metal frame 130 to increase the user's grip. Similarly, when the non-metal back cover 200 ( Fig.16 When an arc structure is adopted (as shown in the figure), the metal back cover 120 can also adopt the same arc structure, so that the appearance of the metal back cover 120 is consistent with that of the non-metal back cover 200, thereby improving the appearance refinement of the shell assembly 02.

[0102] In the above-mentioned housing component 02, Fig. 20 As shown, the metal frame 130 may include a first frame 131 and a second frame 132. The first frame 131 and the second frame 132 may be integrally formed structural members, or structural members connected by welding, riveting, or screwing. The embodiment of the present application does not impose any special restrictions on the connection method of the first frame 131 and the second frame 132. Among them, the first frame 131 is connected to the periphery of the middle plate 110, and the first frame 131 and the middle plate 110 may be integrally formed structural members, or structural members connected by welding, riveting, or screwing. The embodiment of the present application does not impose any special restrictions on the specific connection method of the first frame 131 and the middle plate 110.

[0103] Continue to see Fig. 20, the second frame 132 is connected to the periphery of the metal back cover 120. The metal back cover 120 can be connected to the second frame 132 as an integral structure by processes such as stamping, computer numerical control (CNC) or metal powder injection molding (MIM), thereby improving the structural strength of the housing assembly 02. Of course, the metal back cover 120 and the second frame 132 can also be connected as an integral structure by welding, riveting or screwing. The embodiment of the present application does not impose any special restrictions on the connection method between the metal back cover 120 and the second frame 132.

[0104] The metal plate 111, the metal back cover 120 and the metal frame 130 in the above embodiment can be made of the same metal material, such as stainless steel, aluminum alloy, magnesium alloy and the like. The material and structural integrity between the components of the middle frame 100 can be improved, thereby improving the structural strength of the housing assembly 02, and further facilitating the improvement of the anti-drop performance of the housing assembly 02. Of course, the metal plate 111, the metal back cover 120 and the metal frame 130 can also be made of different metal materials. The embodiment of the present application does not impose any special restrictions on the specific material of the middle frame 100.

[0105] See also Figure 3 , along the Z direction, the surface of the non-metallic back cover 200 away from the middle plate 110 can be flush with the outer surface of the metal back cover 120, and the outer surface of the metal back cover 120 is flush with the second frame 132 ( Fig. 20 In this way, the metal back cover 120 and the non-metal back cover 200 are located on the same side of the middle frame 100, so that the metal back cover 120 and the non-metal back cover 200 can serve as the appearance surface of the housing component 02.

[0106] From the above, we can see that if Figure 3 As shown, the embodiment of the present application can buckle the non-metal back cover 200 on the middle frame 100 through the groove 113, so that the metal back cover 120 and the non-metal back cover 200 serve as the appearance surface of the shell assembly 02, so that the shell assembly 02 forms a back cover solution composed of two materials. Compared with the back cover 20 ( Fig.21As shown in the figure, the diversity of the appearance design of the back cover scheme in the shell component 02 is enriched, the problem of homogeneity of the back shell in appearance design is solved, and the appearance recognition of the shell component 02 is improved. At the same time, the embodiment of the present application uses metal materials as the frame and the back cover, and the edges of the metal back cover 120 and the metal frame 130 are connected as an integrated structure, realizing the metal integration between the metal back cover 120 and the metal frame 130. Compared with the middle frame 100 and the back shell 20 made of different materials in the related art, part of the material seam 60 on the shell component 02 is eliminated. When the user holds the shell component 02, the palm and fingers are usually located at the lower part of the shell component 02. Therefore, setting the lower part of the shell component 02 as a metal integrated structure also avoids the sense of separation when the user holds it, thereby improving the user's holding feel. In addition, when the shell component 02 falls, the lower part of the shell component 02 contacts the ground first under the gravity of the metal material compared to the upper part. The embodiment of the present application configures the metal back cover 120 and the metal frame 130 to be an integrated metal structure, and also improves the structural strength of the housing assembly 02, thereby increasing the anti-drop performance of the mobile phone.

[0107] In order to improve the user's grip feel of the housing assembly 02, the ratio of the vertical projection area of ​​the metal back cover 120 on the middle frame 100 to the area of ​​the middle frame 100 can be greater than 0.15. In this way, the area of ​​the metal back cover 120 can be increased, so that the user's palm or finger is always in contact with the area where the metal back cover 120 is located, improving the user's grip feel. In addition, the larger the area of ​​the metal back cover 120, the better the structural strength of the housing assembly 02 and the anti-drop performance, and the better the appearance recognition of the housing assembly 02.

[0108] On the basis of implementing the technical solution of the housing component 02 in the above embodiment, in order to ensure the radiation performance of the antenna in the housing component 02 and improve the user experience, the position of the antenna in the terminal device 01 is described in detail below. Fig. 22As shown, for example, the terminal device 01 may also include a main circuit board 70, a battery 80, and a sub-circuit board 90. The main circuit board 70 and the sub-circuit board 90 may be electrically connected to multiple chips, memories, feed units and other electronic devices through wires, and the battery 80 may be electrically connected to the main circuit board 70 and the sub-circuit board 90 respectively to provide the required power. The main circuit board 70 may be installed on the upper part of the terminal device 01, the sub-circuit board 90 may be installed on the lower part of the terminal device 01, and the battery 80 may be installed at a position between the main circuit board 70 and the sub-circuit board 90. Of course, depending on the different connection positions between the middle plate 110 and the first frame 131 in the terminal device 01, the main circuit board 70, the battery 80, and the sub-circuit board 90 may be installed between the middle plate 110 and the non-metallic back cover 200, or between the middle plate 110 and the display screen 30. The embodiment of the present application does not impose any special restrictions on the specific installation positions of the main circuit board 70, the battery 80, and the sub-circuit board 90.

[0109] In some embodiments, Fig.23 As shown, the first frame 131 ( Fig. 22 The second frame 132 (shown in FIG. 1 ) may include a low-frequency main antenna 131a, a first non-cellular antenna 131b, a second non-cellular antenna 131c, a first mid-high frequency multi-input / output antenna 131d, a second mid-high frequency multi-input / output antenna 131e, a mid-high frequency diversity antenna 131f, and a low-frequency diversity antenna 131g. Fig. 22 The housing assembly 02 may include a medium-high frequency main antenna 132a. Among them, the non-cellular antenna may include Bluetooth (BT), Wireless Fidelity (Wi-Fi), Global Positioning System (GPS), etc. Of course, the housing assembly 02 may also be provided with other types of antennas. The embodiment of the present application does not impose any special restrictions on the types of antennas on the first frame 131 and the second frame 132.

[0110] For example, the operating frequency band of the low-frequency main antenna 131a and the low-frequency diversity antenna 131g can be 600MHz-1000MHz. The operating frequency band of the medium-high frequency main antenna 132a and the medium-high frequency diversity antenna 131f can be above 1700MHz. The operating frequency band of the first non-cellular antenna 131b, the second non-cellular antenna 131c, the first medium-high frequency multi-input / output antenna 131d and the second medium-high frequency multi-input / output antenna 131e can be above 1700MHz. Of course, the operating frequency bands covered by the above-mentioned antennas can be even wider. The embodiment of the present application does not impose special restrictions on the specific operating frequency bands of the antennas on the first frame 131 and the second frame 132.

[0111] Continue to see Fig.23, the outline of the housing component 02 may be a rectangle, and the outline of the housing component 02 may have two oppositely arranged side edges 101 and two oppositely arranged bottom edges 102, and the length of the side edge 101 is greater than the length of the bottom edge 102. The two side edges 101 may be a left side edge 101a and a right side edge 101b, respectively, and the two bottom edges 102 may be a lower bottom edge 102a and an upper bottom edge 102b, respectively. Among them, the first non-cellular antenna 131b and the first medium and high frequency multi-input / output antenna 131d may be arranged on the upper bottom edge 102b. The second non-cellular antenna 131c and the second medium and high frequency multi-input / output antenna 131e may be arranged on the left side 101a, and close to the upper bottom edge 102b. The medium and high frequency diversity antenna 131f may be arranged on the right side 101b, and close to the upper bottom edge 102b. The low-frequency main antenna 131a may be arranged on the left side 101a, and located between the second non-cellular antenna 131c and the metal back cover 120. The low-frequency diversity antenna 131g can be set on the right side 101b and between the medium-high frequency diversity antenna 131f and the metal back cover 120. The medium-high frequency main antenna 132a can be set on the lower bottom side 102a. Of course, the above-mentioned different types of antennas can also be set at other positions of the first frame 131 and the second frame 132. The embodiment of the present application does not impose any special restrictions on the specific positions of the above-mentioned antennas.

[0112] Among them, Fig.23 As shown, when the mid-high frequency main antenna 132a is set at the lower bottom edge 102a, a groove can be made at the position of the metal back cover 120 close to the lower bottom edge 102a to avoid the influence of the metal back cover 120 on the radiation performance of the mid-high frequency main antenna 132a. In this way, the metal back cover 120 can be set as a back cover of a whole piece of metal material in the MN area in the figure (M refers to the boundary between the middle plate 110 and the metal back cover 120, and N refers to the boundary of the groove of the lower bottom edge 102a), thereby improving the user's grip. The mid-high frequency main antenna 132a is only set at the lower bottom edge 102a, which will not have a significant impact on the overall appearance. At the same time, the low frequency main antenna 131a is no longer set in the area where the metal back cover 120 is located, thereby avoiding the influence of the metal back cover 120 on the radiation performance of the low frequency main antenna 131a.

[0113] Generally, the length of the low-frequency antenna is longer than that of the medium- and high-frequency antenna. If the low-frequency antenna is retained in the area where the metal back cover 120 is located, it is necessary to make a large-area groove on the metal back cover 120, which will greatly affect the overall appearance of the shell component 02. The shell component 02 provided in the embodiment of the present application sets the low-frequency main antenna 131a outside the area where the metal back cover 120 is located, and the non-metal back cover 200 does not reduce the radiation performance of the antenna, thereby avoiding the impact on the radiation performance of the low-frequency main antenna 131a, and also avoiding large-area grooves on the metal back cover 120, ensuring the neat appearance of the shell component 02. At the same time, the length of the medium- and high-frequency antenna is relatively short. By making a groove at the position of the metal back cover 120 close to the lower bottom edge 102a, the medium- and high-frequency main antenna 132a can still be retained in the area where the metal back cover 120 is located. Furthermore, since the low-frequency main antenna 131a is no longer disposed in the area where the metal back cover 120 is located, the length of the medium- and high-frequency main antenna 132a along the Y direction can be appropriately increased, thereby improving the radiation performance of the medium- and high-frequency antennas.

[0114] When the user holds the terminal device 01, for example, when browsing news or web pages, Fig.24 As shown, since the thumb is usually required to manipulate the lower part of the terminal device 01, most users are accustomed to holding the lower part of the terminal device 01. In the embodiment of the present application, the metal back cover 120 is arranged at the lower part of the terminal device 01, which conforms to the user's habit of holding the terminal device 01. Not only can the metal-integrated metal back cover 120 improve the user's holding feeling, but also the low-frequency antenna is arranged in the area where the non-metal back cover 200 is located, which can also avoid the influence of the palm or fingers on the radiation performance of the low-frequency antenna.

[0115] When a user makes a call via terminal device 01, Fig.25 As shown, the user not only needs to hold the terminal device 01, but also needs to hold the receiver 40 ( Fig.24 Therefore, in the embodiment of the present application, the non-cellular antenna mainly used for receiving signals is arranged at the upper part of the terminal device 01, and the low-frequency main antenna 131a that can both receive and transmit signals is arranged at the middle part of the terminal device 01 (the part shown in the dotted box in the figure), which can prevent the influence of the ear and palm of the user on the radiation performance of the low-frequency antenna when making a call.

[0116] The above is a detailed introduction to the position of the antenna in the housing assembly 02 of the embodiment of the present application. In order to better demonstrate the content of the embodiment of the present application, the specific structure of the low-frequency main antenna 131a will be described in detail below. Fig.26 As shown, the low-frequency main antenna 131a is arranged on the first frame 131 ( Fig. 22As shown in FIG. 1 , the first frame 131 may include a first radiator 1, a first slot 1c, a first break 1d and a first ground terminal 1j. The first slot 1c may be arranged between the first radiator 1 and the metal plate 111. The first break 1d separates the first frame 131 and is connected to the first slot 1c. The first ground terminal 1j is close to the side where the metal back cover 120 is located, and the first break 1d is far away from the side where the metal back cover 120 is located. One end of the first radiator 1 is electrically connected to the first ground terminal 1j and is grounded through the first ground terminal 1j. The other end of the first radiator 1 is located at the first break 1d. Among them, the terminal device 01 ( Fig. 22 The main circuit board 70 (shown) may also include a first feeding terminal 1k, and the first feeding terminal 1k may be arranged on the main circuit board 70 ( Fig. 22 As shown), and is electrically connected to the first radiator 1, for providing power to the first radiator 1.

[0117] In this way, when the position of the first slit 1d on the first frame 131 is fixed, the first ground terminal 1j is set at a position close to the metal back cover 120, so that the first radiator 1 has a longer length, thereby meeting the radiation requirements of the low-frequency main antenna 131a. 1 >40mm. When the length of the low-frequency antenna is greater than 40mm, it can cover the operating frequency band of 600MHz-1000MHz.

[0118] In some embodiments, Fig. 27 As shown, the first frame 131 ( Fig. 22 The third radiator 3 may further include a third radiator 3, a third slot 3c and a second slit 2d, and the third slot 3c may be arranged between the third radiator 3 and the metal plate 111. The third slot 3c may be connected to the first slot 1c, the second slit 2d separates the first frame 131, and is arranged on the side of the first slit 1d away from the first ground terminal 1j, and the second slit 2d may also be connected to the third slot 3c. One end of the third radiator 3 is located at the first slit 1d, and the other end is located at the second slit 2d. At this time, the first feeding terminal 1k may be electrically connected to the third radiator 3. In this way, when the length of the first radiator 1 is fixed, the third radiator 3 may be coupled to the first radiator 1 through the first slit 1d, which is beneficial to increase the length of the low-frequency main antenna 131a.

[0119] Among them, Fig. 27As shown, the first radiator 1 may further include a first resonant switch 1x, one end of which may be electrically connected to the first radiator 1, and the other end of which may be electrically connected to the third radiator 3. Thus, the purpose of adjusting the resonant frequency of the first radiator 1 and the third radiator 3 may be achieved by controlling the conduction or cutoff of the first resonant switch 1x, and further, by adjusting the resonant frequency of the first radiator 1 and the third radiator 3, the bandwidth of the low-frequency main antenna 131a may be adjusted, so that the low-frequency main antenna 131a may cover more working frequency bands.

[0120] The above is a detailed introduction to the specific structure of the low-frequency main antenna 131a. Usually, in order to improve the performance of the terminal device 01 in receiving low-frequency signals, a low-frequency diversity antenna 131g is also set in the terminal device 01. The specific structure of the low-frequency diversity antenna 131g will be introduced in detail below. Fig.28 As shown, the low-frequency main antenna 131a in the above embodiment can be arranged on the left side 101a, and the low-frequency diversity antenna 131g can be arranged on the right side 101b. Among them, the low-frequency diversity antenna 131g can be arranged on the side close to the metal back cover 120. When the length of the low-frequency diversity antenna 131g is short, the second medium-high frequency multi-input / output antenna 131e can also be arranged between the medium-high frequency diversity antenna 131f and the low-frequency diversity antenna 131g, so that the length of the low-frequency main antenna 131a on the left side 101a can be set longer to meet the radiation performance requirements of the low-frequency main antenna 131a.

[0121] In some embodiments, Fig.29 As shown, the second medium and high frequency multi-input / output antenna 131e can still be arranged on the first frame 131 ( Fig. 22 At this time, the first frame 131 may also include an isolation slit 131h, which may be provided between the medium-high frequency diversity antenna 131f and the low-frequency diversity antenna 131g, so as to isolate the medium-high frequency diversity antenna 131f from the low-frequency diversity antenna 131g, thereby avoiding the problem that the medium-high frequency diversity antenna 131f and the low-frequency diversity antenna 131g are easily affected by each other due to the presence of a portion of the first frame 131 shared by the medium-high frequency diversity antenna 131f and the low-frequency diversity antenna 131g.

[0122] In other embodiments, Fig.30 As shown, the low-frequency diversity antenna 131g can also be arranged on the side close to the metal back cover 120. Fig. 22The low-frequency diversity antenna 131g may further include a plurality of low-frequency diversity branches 131i, and the low-frequency diversity branches 131i may be arranged on the side of the low-frequency diversity antenna 131g away from the metal back cover 120. The embodiment of the present application does not impose any special restrictions on the specific number of low-frequency diversity branches 131i. In this way, by adding the low-frequency diversity branches 131i, the frequency band covered by the low-frequency diversity antenna 131g can be expanded, thereby improving the performance of the low-frequency diversity antenna 131g in receiving signals.

[0123] In more embodiments, Fig.31 As shown, the low-frequency diversity antenna 131g can also be located on the first frame 131 ( Fig. 22 For example, the low-frequency main antenna 131a can be arranged on the left side 101a, and the low-frequency diversity antenna 131g can be arranged on the right side 101b. Fig.32 As shown, the first frame 131 may also include a fourth radiator 4, a fourth slot 4c, a third break 3d and a second grounding terminal 2j. The fourth slot 4c may be provided between the fourth radiator 4 and the metal plate 111. The third break 3d separates the first frame 131 and is connected to the fourth slot 4c. The second grounding terminal 2j is close to the side where the metal back cover 120 is located, and the third break 3d is away from the side where the metal back cover 120 is located. One end of the fourth radiator 4 is electrically connected to the second grounding terminal 2j and is grounded through the second grounding terminal 2j. The other end of the fourth radiator 4 is located at the third break 3d. Among them, the terminal device 01( Fig. 22 The main circuit board 70 (shown) may also include a second feeding terminal 2k, which may be arranged on the main circuit board 70 ( Fig. 22 As shown), and is electrically connected to the fourth radiator 4 to provide power to the fourth radiator 4.

[0124] In this way, when the position of the third slit 3d on the first frame 131 is fixed, the second ground terminal 2j is set at a position close to the metal back cover 120, so that the fourth radiator 4 can have a longer length, thereby meeting the radiation requirements of the low-frequency diversity antenna 131g. Of course, the length L of the fourth radiator 4 4 >40mm. The longer the low-frequency antenna is, the more beneficial it is to improve the radiation performance of the low-frequency antenna.

[0125] In some embodiments, Fig.33 As shown, the first frame 131 ( Fig. 22The fifth radiator 5 may further include a fifth radiator 5, a fifth slot 5c and a fourth slit 4d, wherein the fifth slot 5c may be arranged between the fifth radiator 5 and the metal plate 111. The fifth slot 5c may be connected to the fourth slot 4c, the fourth slit 4d separates the first frame 131 and is arranged on the side of the third slit 3d away from the second ground terminal 2j, and the fourth slit 4d may also be connected to the fifth slot 5c. One end of the fifth radiator 5 is located at the third slit 3d, and the other end is located at the fourth slit 4d. At this time, the second feeding terminal 2k may be electrically connected to the fifth radiator 5. In this way, when the length of the fourth radiator 4 is fixed, the fifth radiator 5 may be coupled to the fourth radiator 4 through the third slit 3d, thereby facilitating increasing the length of the low-frequency diversity antenna 131g.

[0126] Among them, Fig.33 As shown, the fourth radiator 4 may further include a second resonant switch 2x, one end of the second resonant switch 2x may be electrically connected to the fourth radiator 4, and the other end of the second resonant switch 2x may be electrically connected to the fifth radiator 5. Thus, the purpose of adjusting the resonant frequency of the fourth radiator 4 and the fifth radiator 5 can be achieved by controlling the conduction or cutoff of the second resonant switch 2x, and then by adjusting the resonant frequency of the fourth radiator 4 and the fifth radiator 5, the bandwidth of the low-frequency diversity antenna 131g can be adjusted, so that the low-frequency diversity antenna 131g can cover more working frequency bands.

[0127] The above is a detailed introduction to the specific structure of the low-frequency diversity antenna 131g. Fig.34 As shown, the first frame 131 ( Fig. 22 The radiator 101 may further include a plurality of seventh radiators 7, a portion of which may be disposed on the left side 101a or the right side 101b and close to the upper bottom side 102b, and another portion of which may be disposed on the upper bottom side 102b. A gap may be disposed between the plurality of seventh radiators 7, and a slot may be disposed between the seventh radiator 7 and the middle plate 110. Each of the seventh radiators 7 may be configured with a different ground terminal and a feeding terminal, so that the plurality of seventh radiators 7 may respectively serve as the first non-cellular antenna 131b, the second non-cellular antenna 131c, the first medium-high frequency multi-input / output antenna 131d, the second medium-high frequency multi-input / output antenna 131e, and the medium-high frequency diversity antenna 131f in the above-mentioned embodiment.

[0128] The above embodiment is a detailed introduction to the specific structure of various antennas on the first frame 131. The following embodiment will give a detailed introduction to the specific structure of the medium and high frequency main antenna 132a on the second frame 132. Fig.35 As shown, the medium and high frequency main antenna 132a can be arranged on the second frame 132 and located at the lower bottom edge 102a ( Fig.36As shown). The second frame 132 may include a second radiator 2, a second slot 2c, a fifth break 5d and a third ground terminal 3j. The second slot 2c may be arranged between the second radiator 2 and the metal back cover 120. The second slot 2c may be connected to the fifth break 5d that separates the second frame 132. The third ground terminal 3j is close to one end of the lower bottom edge 102a, and the fifth break 5d is close to the other end of the lower bottom edge 102a, so that the fifth break 5d and the second slot 2c form an approximately L-shaped appearance on the metal back cover 120. One end of the second radiator 2 is electrically connected to the third ground terminal 3j and is grounded through the third ground terminal 3j. The other end of the second radiator 2 is located at the fifth break 5d. Among them, the terminal device 01 ( Fig. 22 The auxiliary circuit board 90 (shown) may further include a third feeding terminal 3k, which may be arranged on the auxiliary circuit board 90 ( Fig. 22 As shown), and is electrically connected to the second radiator 2, for providing power to the second radiator 2. Wherein, the length L of the second radiator 2 2 <30mm. When the length of the medium and high frequency antenna is less than 30mm, it can cover the operating frequency band above 1700MHz.

[0129] In some embodiments, Fig.36 As shown, the difference from the above embodiment is that the third grounding terminal 3j is located at one end of the lower bottom edge 102a in the second frame 132 and is connected to the second slot 2c, and the other end of the second slot 2c is located at the other end of the lower bottom edge 102a. That is, the two ends of the second slot 2c are respectively located at the two ends of the lower bottom edge 102a, and the fifth slit 5d can be located at any position between the two ends of the lower bottom edge 102a. In this way, the fifth slit 5d and the second slot 2c can also form an approximately T-shaped appearance on the metal back cover 120.

[0130] In some embodiments, Fig.37 As shown, the difference from the above embodiment is that the medium and high frequency main antenna 132a can also include a first branch Z 1 , Second Branch Z 2 And the third branch Z 3 Specifically, two fifth slits 5d may be provided, and two third grounding terminals 3j may be provided. The two ends of the second slot 2c are respectively located at the lower bottom edge 102a ( Fig.36 The two third ground terminals 3j are also located at the two ends of the lower bottom edge 102a, respectively. The second radiator 2 ( Fig.35 The two ends of the second radiator 2 are respectively electrically connected to the two third grounding terminals 3j and are grounded through the third grounding terminals 3j. The two fifth slits 5d can divide the second radiator 2 into first branches Z 1 , Second Branch Z 2 And the third branch Z 3The third feeding terminal 3k( Fig.35 As shown) can be combined with the second branch Z 2 Electrical connection. The two third grounding terminals 3j are symmetrically arranged at both ends of the lower bottom edge 102a, and the two fifth slits 5d are symmetrically arranged between the two third grounding terminals 3j. In this way, the second slot 2c and the two fifth slits 5d can form an approximately π-shaped appearance on the lower bottom edge 102a. In addition, the two fifth slits 5d can be symmetrically arranged on the lower bottom edge 102a of the second frame 132, and the second slot 2c can also be symmetrically arranged on the lower bottom edge 102a of the second frame 132, thereby improving the refinement of the product appearance.

[0131] In some embodiments, Fig.38 As shown, the difference from the above embodiment is that the two third grounding terminals 3j can also be set at the positions of the two fifth slits 5d, the two ends of the second slot 2c are respectively connected to the two fifth slits 5d, and the two ends of the second radiator 2 are respectively located at the two fifth slits 5d, so that the second slot 2c can form a shape similar to a door frame with the two fifth slits 5d at the lower bottom edge 102a. In addition, the two fifth slits 5d can be symmetrically arranged at the lower bottom edge 102a of the second frame 132, and the second slot 2c can also be symmetrically arranged at the lower bottom edge 102a of the second frame 132, so as to improve the refinement of the product appearance.

[0132] In some embodiments, Fig.39 As shown, the difference from the above embodiment is that the second frame 132 can also include a second radiator 2 ( Fig.35 The sixth radiator 6 connected to the metal back cover 120 may be provided with a sixth slot 6c between the sixth radiator 6 and the metal back cover 120, and the sixth slot 6c may be connected to the second slot 2c. The third ground terminal 3j may be provided on the left side 101a of the second frame 132, and the other end of the sixth radiator 6 may be electrically connected to the third ground terminal 3j and grounded through the third ground terminal 3j. Of course, the two sixth slots 6c may also be symmetrically provided on the left side 101a and the right side 101b of the second frame 132, so that the second slot 2c, the sixth slot 6c and the two fifth breaks 5d are symmetrical about the midline of the lower bottom side 102a of the second frame 132.

[0133] In some embodiments, Fig.40As shown, the difference from the above embodiment is that, based on the above embodiment, the second frame can also include four fifth breaks 5d. Two of the fifth breaks 5d can be symmetrically arranged on the left side 101a and the right side 101b of the second frame 132, and the other two fifth breaks 5d can be symmetrically arranged on the lower bottom side 102a. The second slot 2c can be connected to the two fifth breaks 5d, and the sixth slot 6c can be connected to the two fifth breaks 5d. A fifth break 5d is added to the left side 101a and the right side 101b of the second frame 132, respectively, so that the second slot 2c, the sixth slot 6c and the four fifth breaks 5d are symmetrical about the midline of the lower bottom side 102a of the second frame 132.

[0134] The above is a detailed introduction to the specific structures of various antennas on the first frame 131 and the second frame 132. In the housing assembly 02 of the embodiment of the present application, antennas with different structures in the above embodiments can be provided. Fig.41 As shown, the low frequency main antenna 131a and the medium and high frequency main antenna 132a can be configured as follows: Fig.23 The antenna structure shown in FIG. 1 is a schematic diagram of a low-frequency main antenna 131 a and a medium- and high-frequency main antenna 132 a. The specific structures of the low-frequency main antenna 131 a and the medium- and high-frequency main antenna 132 a are not described in detail herein. Fig.41 The current distribution diagram of the terminal device 01 is shown. The low-frequency main antenna 131a can form a current loop between the second break 2d and the first ground terminal 1j, and the medium- and high-frequency main antenna 132a can form a current loop between the two third ground terminals 3j.

[0135] Based on this, Fig.42 As shown, the system efficiency ε of the low-frequency main antenna 131a and the medium-high frequency main antenna 132a in the above embodiment is shown. The system efficiency ε refers to the ratio of the power radiated by the antenna to the space (i.e., the power of the electromagnetic wave part that is effectively converted) to the input power of the antenna. When the ratio of the power radiated by the antenna to the input power of the antenna is larger, the loss of the system is smaller and the system efficiency ε is larger. Conversely, when the ratio of the power radiated by the antenna to the input power of the antenna is smaller, the loss of the system is larger and the system efficiency ε is smaller.

[0136] like Fig.42As shown, the embodiment of the present application tests the system efficiency ε of the low-frequency main antenna 131a when the frequency (f) is 800MHz (LB). At the same time, the system efficiency ε of the medium-high frequency main antenna 132a when the frequency (f) is 1700MHz (MHB1), 2000MHz (MHB2) and 2500MHz (MHB3) is also tested. It can be seen from the figure that the system efficiency ε of the low-frequency main antenna 131a can reach 40% at 800MHz (LB). The system efficiency ε of the medium-high frequency main antenna 132a can reach 50% at 1700MHz (MHB1), 2000MHz (MHB2) and 2500MHz (MHB3).

[0137] In addition, if Fig.43 As shown, the reflection coefficient curve S11 of the low-frequency main antenna 131a and the medium-high frequency main antenna 132a in the above embodiment is shown, which is used to represent the return loss of the antenna. The S11 parameter is usually a negative number, and the smaller the S11 parameter is, the smaller the return loss of the antenna is, and the smaller the energy reflected back by the antenna is, which means that more energy actually enters the antenna and the higher the working efficiency of the antenna is. Conversely, the larger the S11 parameter is, the greater the return loss of the antenna is, and the lower the working efficiency of the antenna is. Among them, the return loss refers to the ratio of the signal power reflected back to the antenna through the antenna circuit to the antenna transmission power.

[0138] like Fig.43 As shown, the embodiment of the present application also tests the S11 parameters of the low-frequency main antenna 131a when the frequency (f) is 800MHz (LB). At the same time, the S11 parameters of the medium-high frequency main antenna 132a are also tested when the frequency (f) is 1700MHz (MHB1), 2500MHz (MHB2) and 2700MHz (MHB3). It can be seen from the figure that the S11 parameter of the low-frequency main antenna 131a can be less than -20dB at 800MHz (LB). The S11 parameters of the medium-high frequency main antenna 132a can also be less than -15dB at 1700MHz (MHB1), 2500MHz (MHB2) and 2700MHz (MHB3).

[0139] It can be seen from this that in the related technology, such as Fig.44 and Fig.45 As shown, the low-frequency main antenna 131a is usually arranged at the lower part A of the housing component 02. 1 As a result, a large area of ​​slotting needs to be performed between the metal back cover 120 and the second frame 132 along the direction of the low-frequency main antenna 131a to avoid the influence of the metal back cover 120 on the radiation performance of the low-frequency main antenna 131a. Fig.23As shown, the low-frequency main antenna 131a is arranged on the left side 101a of the shell component 02, and is arranged outside the area where the metal back cover 120 is located. Since the non-metal back cover 200 does not reduce the radiation performance of the antenna, the influence of the metal back cover 120 on the radiation performance of the low-frequency antenna is reduced, and there is no need to perform groove processing on the non-metal back cover 200. In addition, compared with the related art, the embodiment of the present application also avoids the reduction of the structural strength of the shell component 02 due to the grooves at the corner position of the lower part of the shell component 02 between the metal back cover 120 and the second frame 132, thereby avoiding the influence on the anti-drop performance of the shell component 02.

[0140] At the same time, in related technologies, such as Fig.44 and Fig.45 As shown, the medium and high frequency main antenna 132a is usually arranged at the lower part A of the housing component 02. 2 The area causes the low-frequency main antenna 131a and the medium-high frequency main antenna 132a to share the bottom gap D. When the medium-high frequency main antenna 132a is working, the frequency doubling of the low-frequency main antenna 131a will generate clutter in the medium-high frequency main antenna 132a and absorb efficiency, thereby causing the low-frequency main antenna 131a and the medium-high frequency main antenna 132a to affect each other, reducing the radiation performance of the two antennas. In the embodiment of the present application, Fig.23 As shown, the medium and high frequency main antenna 132a is arranged on the lower bottom edge 102a of the housing assembly 02, and is arranged in the area where the metal back cover 120 is located. Since the low frequency main antenna 131a is no longer arranged on the second frame 132, the low frequency main antenna 131a and the medium and high frequency main antenna 132a do not need to be arranged on the second frame 132 at the same time. Therefore, only the medium and high frequency main antenna 132a needs to be arranged on the second frame 132, which increases the arrangement length of the medium and high frequency main antenna 132a, thereby improving the radiation performance of the medium and high frequency main antenna 132a.

[0141] 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 substitutions within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A housing assembly, characterized in that: include: A middle frame, comprising a middle plate, a metal back cover and a metal frame, wherein the metal frame comprises a first frame and a second frame connected to each other; The middle plate and the metal back cover are arranged in the metal frame, the first frame is connected to the periphery of the middle plate, and the second frame is connected to the periphery of the metal back cover; the first frame, the middle plate and the metal back cover are surrounded by a groove; and, a non-metallic back cover, buckled on the groove and connected to the middle frame; the metal back cover is connected to the edge of the second frame, and the metal back cover and the non-metallic back cover are located on the same side of the middle frame; Among them, the first frame includes a first radiator with an operating frequency band of 600MHz-1000MHz, the second frame includes a second radiator with an operating frequency band of more than 1700MHz, the second frame does not include the first radiator, and a second groove is arranged between the second radiator and the metal back cover.

2. The housing assembly according to claim 1, characterized in that: The outline of the middle frame is a rectangle, and the outline of the middle frame has two oppositely disposed side edges and two oppositely disposed bottom edges; the length of the side edges is greater than the length of the bottom edges; The first radiator is arranged on the side, and the second radiator is arranged on the bottom.

3. The housing assembly according to claim 2, characterized in that: At least part of the middle plate is a metal plate, a first slot is provided between the first radiator and the metal plate; the first frame includes a first grounding end and a first crack that separates the first frame, and the first slot is connected to the first crack; One end of the first radiator is electrically connected to the first grounding end and grounded through the first grounding end, and the first grounding end is close to the second frame; the other end of the first radiator is located at the first break, and the first break is far away from the second frame.

4. The housing assembly according to claim 3, characterized in that: The first frame further includes a third radiator and a second fracture that separates the first frame, a third slot is provided between the third radiator and the metal plate, the third slot is connected to the first slot, the second fracture is provided on a side of the first fracture away from the first ground end, and the second fracture is connected to the third slot; One end of the third radiator is located at the first slit, and the other end of the third radiator is located at the second slit.

5. The housing assembly according to claim 4, characterized in that: The first radiator further includes a first resonant switch; One end of the first resonant switch is electrically connected to the first radiator, and the other end of the first resonant switch is electrically connected to the third radiator.

6. The housing assembly according to claim 5, characterized in that: The first frame further includes a fourth radiator, and a fourth slot is provided between the fourth radiator and the metal plate; the first frame includes a second grounding terminal and a third fracture that separates the first frame, and the fourth slot is connected to the third fracture; One end of the fourth radiator is electrically connected to the second grounding end and is grounded through the second grounding end, and the second grounding end is close to the second frame; the other end of the fourth radiator is located at the third break, and the third break is far away from the second frame; The first radiator and the fourth radiator are respectively disposed on the two side edges.

7. The housing assembly according to claim 6, characterized in that: The first frame further includes a fifth radiator and a fourth fracture that separates the first frame, a fifth slot is provided between the fifth radiator and the metal plate, the fifth slot is connected to the fourth slot, the fourth fracture is provided on a side of the third fracture away from the second ground end, and the fourth fracture is connected to the fifth slot; One end of the fifth radiator is located at the third slit, and the other end of the fifth radiator is located at the fourth slit.

8. The housing assembly according to claim 7, characterized in that: The fourth radiator further includes a second resonant switch; One end of the second resonant switch is electrically connected to the fourth radiator, and the other end of the second resonant switch is electrically connected to the fifth radiator.

9. The housing assembly according to any one of claims 1 to 8, characterized in that: The length L1 of the first radiator is greater than 40 mm.

10. The housing assembly according to claim 2, characterized in that: The second frame includes a third grounding end and a fifth fracture that separates the second frame, and the second slot is connected to the fifth fracture; One end of the second radiator is electrically connected to the third grounding end and is grounded through the third grounding end, and the third grounding end is close to one end of the bottom edge; the other end of the second radiator is located at the fifth break, and the fifth break is close to the other end of the bottom edge.

11. The housing assembly according to claim 2, characterized in that: The second frame includes a third grounding end and a fifth fracture that separates the second frame, and the second slot is connected to the fifth fracture; One end of the second radiator is electrically connected to the third grounding end and is grounded through the third grounding end, and the third grounding end is close to one end of the bottom edge; the other end of the second radiator is located at the other end of the bottom edge.

12. The housing assembly according to claim 2, characterized in that: The second frame includes two third grounding ends and two fifth breaks that separate the second frame, and the second slot is connected to the two fifth breaks; The two ends of the second radiator are electrically connected to the two third grounding ends respectively and are grounded through the third grounding ends. The two third grounding ends are symmetrically arranged at the two ends of the bottom edge; the two fifth breaks are symmetrically arranged between the two third grounding ends.

13. The housing assembly according to claim 2, characterized in that: The second frame includes a third grounding end and two fifth breaks that separate the second frame, and the second slot is connected to the two fifth breaks; The second radiator is electrically connected to the third grounding end and is grounded through the third grounding end; two ends of the second radiator are respectively located at the two fifth breaks, and the two fifth breaks are symmetrically arranged at the two ends of the bottom edge.

14. The housing assembly according to claim 2, characterized in that The second frame further includes a sixth radiator connected to the second radiator, a sixth slot is provided between the sixth radiator and the metal back cover, and the sixth slot is connected to the second slot; the second frame includes a third ground terminal and two fifth breaks that separate the second frame, and the second slot is connected to the two fifth breaks; At least one of the second radiator and the sixth radiator is electrically connected to the third grounding terminal and is grounded through the third grounding terminal. The two sixth slots are symmetrically arranged on the two side edges; and the two fifth slits are symmetrically arranged on the bottom edge.

15. The housing assembly according to claim 2, characterized in that: The second frame further includes a sixth radiator connected to the second radiator, a sixth slot is provided between the sixth radiator and the metal back cover, and the sixth slot is connected to the second slot; the second frame includes a third ground terminal and four fifth breaks that separate the second frame, the second slot is connected to two of the fifth breaks, and the sixth slot is connected to two of the fifth breaks; At least one of the second radiator and the sixth radiator is electrically connected to the third grounding terminal and is grounded through the third grounding terminal. The two sixth slots are symmetrically arranged on the two side edges; the two fifth breaks are symmetrically arranged on the two side edges, and the two fifth breaks are symmetrically arranged on the bottom edge.

16. The housing assembly according to any one of claims 1 to 15, characterized in that: The length L2 of the second radiator is less than 30 mm.

17. The housing assembly according to claim 2, characterized in that: The housing assembly further includes a charging interface, and the first frame further includes a plurality of seventh radiators, and the operating frequency band of the seventh radiators is above 1700 MHz; The charging port is arranged at the bottom edge of the second frame, a portion of the seventh radiator is arranged at the side edge of the first frame and close to the bottom edge of the first frame; another portion of the seventh radiator is arranged at the bottom edge of the first frame.

18. The housing assembly according to any one of claims 1 to 17, characterized in that: The ratio of the vertical projection area of ​​the metal back cover on the middle frame to the area of ​​the middle frame is greater than 0.

15.

19. The housing assembly according to any one of claims 1 to 17, characterized in that: The metal back cover is made of the same material as the second frame, and the metal back cover and the second frame are connected to form an integrated structure.

20. The housing assembly according to any one of claims 1 to 17, characterized in that: The non-metallic back cover has a first interface on one side close to the metal back cover, and the metal back cover has a second interface on one side close to the non-metallic back cover, and the first interface and the second interface are attached to form a boundary line; The boundary line is a straight line, a curve or a broken line.

21. A terminal device, characterized in that: include: Display screen; as well as, The shell assembly according to any one of claims 1 to 20, wherein the display screen is connected to the shell assembly.

22. The terminal device according to claim 21, characterized in that: The terminal device also includes a wireless charging coil; The wireless charging coil is mounted on the middle plate of the housing assembly.

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