Middle frame structure for 3D printing and terminal equipment
By setting hollow sections and multiple reinforcing ribs on the reinforcing ribs of the mid-frame structure in the terminal device, the weight and heat dissipation problems of the mid-frame structure are solved by using 3D printing technology, achieving the effects of lightweighting and efficient heat dissipation.
Patent Information
- Application Number
- CN202422400447.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-29
- Publication Date
- 2025-11-14
- Estimated Expiration
- 2034-09-29
AI Technical Summary
The existing terminal equipment has an unreasonable frame structure design, which leads to increased equipment weight and poor heat dissipation.
The mid-frame structure is manufactured using 3D printing technology. By setting hollow sections on the reinforcing ribs, material usage is reduced and structural strength is enhanced. At the same time, multiple reinforcing ribs are set on the inner side of the frame to improve overall strength and heat dissipation.
It effectively reduces the weight of the mid-frame structure and terminal equipment, enhances structural strength, improves heat dissipation performance, reduces production costs, and increases production efficiency.
Smart Images
Figure CN223553552U_ABST
Abstract
Description
Technical Field
[0001] This disclosure relates to the field of electronic device technology, and more particularly to a 3D-printed mid-frame structure and terminal device. Background Technology
[0002] In terminal devices, the display module generally includes a mid-frame and a mid-plate. The mid-plate is located inside the mid-frame, and the mid-frame provides structural strength for the entire terminal device to prevent deformation under stress.
[0003] In related technologies, the mid-frame typically includes a top bezel, a bottom bezel, a left bezel, and a right bezel. The top bezel, bottom bezel, left bezel, and right bezel are made of metal. However, due to the current unreasonable structural design of the mid-frame, it increases the weight of the entire terminal device. Utility Model Content
[0004] This disclosure provides a 3D-printed mid-frame structure and a terminal device to solve or alleviate one or more technical problems in the prior art.
[0005] As one aspect of this disclosure, an embodiment provides a 3D-printed mid-frame structure, comprising:
[0006] Top border, bottom border, left border, and right border;
[0007] Multiple reinforcing ribs are spaced apart on the inner side of each frame;
[0008] At least some of the reinforcing ribs have openwork sections.
[0009] In some embodiments, a hollowed-out portion is provided on one reinforcing rib of the left frame, and hollowed-out portions are provided on both reinforcing ribs of the right frame.
[0010] In some embodiments, the cutout portion on the left frame is located in the middle of the left frame;
[0011] One of the two cutouts on the right frame is located at the end of the right frame, and the other cutout is positioned opposite to the cutout on the left frame.
[0012] In some embodiments, a reinforcing rib with a hollowed-out portion is provided at both ends of the left frame;
[0013] Each end of the right frame is equipped with a reinforcing rib with a cutout section.
[0014] In some embodiments, each cutout is a mesh structure, wherein the cutout shape is triangular.
[0015] In some embodiments, the middle frame structure has multiple antenna slots arranged circumferentially.
[0016] In some embodiments, the distance L1 between the two antenna slots on the upper frame is greater than the distance L2 between the two antenna slots on the lower frame, and the distance L3 between the two antenna slots on the left frame is less than the distance L4 between the two antenna slots on the right frame.
[0017] In some embodiments, a gap is provided between each reinforcing rib for connection to the middle plate via plastic.
[0018] In some embodiments, at least a portion of the reinforcing ribs on each frame are provided with through holes for connection to holes in the middle plate via plastic.
[0019] As another aspect of the present disclosure, the present disclosure also provides a terminal device, which includes a display device, a back cover, and a mid-frame structure as described in any of the above; the display device is disposed on one side of the mid-frame structure, and the back cover is disposed on the other side of the mid-frame structure.
[0020] The embodiments disclosed herein have the following beneficial effects:
[0021] At least some of the reinforcing ribs in the mid-frame structure of this disclosure have hollowed-out portions. These hollowed-out portions reduce the weight of the reinforcing ribs, thereby reducing the weight of the mid-frame structure and, consequently, the weight of the terminal device using the mid-frame structure of this disclosure. This allows the embodiments of this disclosure to enhance the strength of the mid-frame structure through the reinforcing ribs while simultaneously reducing the impact of the reinforcing ribs on the weight of the mid-frame structure by providing hollowed-out portions. Furthermore, the hollowed-out portions on the reinforcing ribs also enhance the strength of the top, bottom, left, and right frame frames while preventing airflow obstruction at these locations, thus ensuring effective heat dissipation at the locations of the reinforcing ribs in the mid-frame structure.
[0022] The above overview is for illustrative purposes only and is not intended to be limiting in any way. Further aspects, embodiments, and features of this disclosure will become readily apparent from the accompanying drawings and the following detailed description, in addition to the illustrative aspects, embodiments, and features described above. Attached Figure Description
[0023] In the accompanying drawings, unless otherwise specified, the same reference numerals throughout the various drawings denote the same or similar parts or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings depict only some embodiments disclosed in this disclosure and should not be construed as limiting the scope of this disclosure.
[0024] Figure 1 This diagram illustrates a partial terminal device structure including the mid-frame structure of an embodiment of the present disclosure.
[0025] Figure 2A top view of the mid-frame structure according to an embodiment of the present disclosure is shown;
[0026] Figure 3 Show Figure 2 Enlarged diagram of A in the middle;
[0027] Figure 4 A schematic diagram showing the connection relationship between the middle frame structure and the middle plate according to an embodiment of the present disclosure is provided.
[0028] Figure 5 A schematic diagram of the structure of the middle plate according to an embodiment of the present disclosure is shown.
[0029] Explanation of reference numerals in the attached figures:
[0030] 10. Mid-frame structure;
[0031] 100. Top border;
[0032] 200. Bottom border;
[0033] 300, left border;
[0034] 400, right side frame;
[0035] 500. Reinforcing rib; 510. Hollowed-out section; 520. Through hole;
[0036] 600, Antenna slot;
[0037] 700, gap;
[0038] 800, Plastic;
[0039] 20. Middle plate;
[0040] 21. Hole. Detailed Implementation
[0041] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of this disclosure. Therefore, the drawings and description are to be considered exemplary in nature and not restrictive.
[0042] Figure 1 This diagram illustrates a partial terminal device structure including the mid-frame structure of an embodiment of the present disclosure. Figure 2 A top view of the mid-frame structure according to an embodiment of the present disclosure is shown; Figure 3 Show Figure 2 An enlarged diagram of A in the diagram. See also... Figures 1 to 3A 3D printed mid-frame structure 10 is provided. The mid-frame structure 10 is made of metal. In order to ensure the conductivity and heat dissipation of the mid-frame structure 10, the material of the mid-frame structure 10 can be aluminum alloy. Furthermore, some parts of the mid-frame structure 10 can also be made of metals or alloys with better conductivity, such as copper-steel alloy. The parts made of copper-steel alloy are structures on the mid-frame structure 10 that require other electronic components to achieve signal transmission.
[0043] In this disclosure embodiment, see Figure 1 and Figure 2 The middle frame structure 10 includes an upper frame 100, a lower frame 200, a left frame 300, and a right frame 400. Multiple reinforcing ribs 500 are spaced apart on the inner side of each frame. The reinforcing ribs 500 enhance the strength of the upper frame 100, lower frame 200, left frame 300, and right frame 400, effectively ensuring the overall strength of the middle frame structure 10. At least some of the reinforcing ribs 500 have hollowed-out portions 510. The hollowed-out portions 510 reduce the weight of the reinforcing ribs 500, thereby reducing the weight of the middle frame structure 10, and consequently reducing the weight of the terminal device using the middle frame structure 10 of this embodiment. This embodiment of the present disclosure, on the one hand, enhances the strength of the middle frame structure 10 through the reinforcing ribs 500, and on the other hand, reduces the impact of the reinforcing ribs 500 on the weight of the middle frame structure 10 by providing hollowed-out portions 510 on the reinforcing ribs 500. Furthermore, the hollowed-out portion 510 on the reinforcing rib 500 can enhance the strength of the upper frame 100, lower frame 200, left frame 300 and right frame 400, while preventing air from being blocked by the reinforcing rib 500 and thus ensuring the heat dissipation effect at the location where the reinforcing rib 500 is set on the middle frame structure 10.
[0044] It is understood that the number and position of the reinforcing ribs 500 on the inner side of the top frame 100, bottom frame 200, left frame 300 and right frame 400 need to be set according to the design of the internal components of the terminal device using the mid-frame structure 10 of this disclosure embodiment. The reinforcing ribs 500 need to be set in a position that can avoid the internal components of the terminal device.
[0045] In some embodiments, see Figure 2 A reinforcing rib 500 is provided inside the left frame 300, and two reinforcing ribs 500 are provided in the right frame 400. One of the reinforcing ribs 500 in the left frame 300 has a hollow part 510, and both of the two reinforcing ribs 500 in the right frame 400 have hollow parts 510. This arrangement can reduce the impact of the reinforcing ribs 500 on the weight of the middle frame structure 10 by providing hollow parts 510 in the reinforcing ribs 500.
[0046] In some embodiments, see Figure 2 The cutout portion 510 on the left frame 300 is located in the middle of the left frame 300. Of the two cutout portions 510 on the right frame 400, one cutout portion 510 is located at the end of the right frame 400, and the other cutout portion 510 is positioned opposite to the cutout portion 510 on the left frame 300.
[0047] In this embodiment, stress concentration occurs at the connection between the right frame 400 and the lower frame 200, leading to increased stress at the connection. Therefore, this embodiment addresses this by providing a reinforcing rib 500 at the end of the right frame 400 and connecting the reinforcing rib 500 to the lower frame 200, thus preventing stress concentration at the connection and further strengthening the lower frame 200 and the right frame 400.
[0048] In some embodiments, a reinforcing rib 500 with a hollow portion 510 is provided at both ends of the left frame 300, and a reinforcing rib 500 with a hollow portion 510 is provided at both ends of the right frame 400.
[0049] In this embodiment, stress concentration occurs at the connections between the right frame 400 and the top frame 100 and the bottom frame 200, and at the connections between the left frame 300 and the top frame 100 and the bottom frame 200. This leads to increased stress at these connections. Therefore, this embodiment addresses this issue by ensuring that stress concentration occurs at the connections between the right frame 400 and the top frame 100 and the bottom frame 200, and at the connections between the left frame 300 and the top frame 100 and the bottom frame 200. A reinforcing rib 500 with a hollowed-out portion 510 is provided. By connecting the reinforcing ribs 500 at both ends of the right frame 400 to the upper frame 100 and the lower frame 200 respectively, and by connecting the reinforcing ribs 500 at both ends of the left frame 300 to the upper frame 100 and the lower frame 200 respectively, stress concentration is avoided at the connection points of the right frame 400 with the upper frame 100 and the lower frame 200 respectively, and at the connection points of the left frame 300 with the upper frame 100 and the lower frame 200 respectively, thereby further strengthening the strength of the upper frame 100, the lower frame 200, the left frame 300 and the right frame 400.
[0050] In some embodiments, see Figure 3Each cutout portion 510 has a mesh structure, with the cutout shape being triangular. This embodiment of the present disclosure effectively reduces material usage and thus lightens the overall weight by setting the cutout portion 510 to multiple triangular cutouts. This is particularly beneficial for terminal devices, which have high weight requirements; the cutout portion 510 of this disclosure can effectively reduce the weight of the terminal device. Secondly, a triangle is a very stable geometric shape. Using triangular cutout portions 510 can effectively distribute and bear the external forces on the middle frame structure 10, enhancing the structural strength of the upper frame 100, lower frame 200, left frame 300, and right frame 400. Simultaneously, the triangular cutout portion 510 can also reduce the material used in the reinforcing ribs 500, thereby reducing the weight of the middle frame structure 10. Furthermore, the hollowed-out portion 510 on the reinforcing rib 500 can enhance the strength of the upper frame 100, lower frame 200, left frame 300 and right frame 400, while preventing air from being blocked by the reinforcing rib 500 and thus ensuring the heat dissipation effect at the location where the reinforcing rib 500 is set on the middle frame structure 10.
[0051] For example, a plurality of triangular cutouts 510 on the reinforcing rib 500 are adjacent to each other along the length direction of the middle frame structure 10, and a plurality of triangular cutouts 510 on the reinforcing rib 500 are adjacent to each other along the width direction of the middle frame structure 10.
[0052] Further, see Figure 3 In order to increase the area of the hollow portion 510 on the reinforcing rib 500, the orientation of two adjacent triangular hollow portions 510 in the length direction of the middle frame structure 10 is opposite. For example, the bottom edge of the first triangular hollow portion 510 in the length direction of the middle frame structure 10 is located on the left, the bottom edge of the second triangular hollow portion 510 is located on the right, the bottom edge of the third triangular hollow portion 510 is located on the left, and so on. Furthermore, the two adjacent triangular cutouts 510 in the width direction of the middle frame structure 10 are oriented in opposite directions. For example, there are two triangular cutouts 510 in the width direction of the middle frame structure 10, with the bottom edges of the first and second triangular cutouts 510 facing each other. This embodiment of the present disclosure further enhances the proportion of the cutouts 510 in the reinforcing ribs 500 by arranging the triangular cutouts 510, so that the middle frame structure 10 can reduce the material used in the reinforcing ribs 500 while ensuring the structural strength of the upper frame 100, lower frame 200, left frame 300 and right frame 400, thereby achieving the effect of further reducing the weight of the middle frame structure 10.
[0053] It is understood that the cutout portion 510 disclosed herein can also be other shapes, such as rectangle, rhombus, circle, etc.
[0054] In some embodiments, see Figure 2 The middle frame structure 10 has multiple antenna slots 600 arranged in the circumferential direction. By opening antenna slots 600 in the upper frame 100, lower frame 200, left frame 300 and right frame 400, the signal of the terminal device can be prevented from being blocked due to the coverage of the upper frame 100, lower frame 200, left frame 300 and right frame 400.
[0055] Preferably, the back cover can be made of glass, which can improve the signal transmission of the internal 4G / 5G card.
[0056] In some embodiments, reference Figure 2 The distance L1 between the two antenna slots 600 on the upper frame 100 is greater than the distance L2 between the two antenna slots 600 on the lower frame 200, and the distance L3 between the two antenna slots 600 on the left frame 300 is less than the distance L4 between the two antenna slots 600 on the right frame 400.
[0057] Figure 4 A schematic diagram showing the connection relationship between the middle frame structure and the middle plate according to an embodiment of the present disclosure is provided. Figure 5 A schematic diagram of the structure of the middle plate according to an embodiment of the present disclosure is shown. See also: Figure 4 and Figure 5 In some embodiments, a gap 700 is provided between each reinforcing rib 500, the gap 700 being used to connect to the middle plate 20 via plastic 800, thereby realizing the connection between the middle frame structure 10, the reinforcing ribs 500 and the middle plate 20.
[0058] In some embodiments, see Figures 3 to 5 Each frame has at least a portion of the reinforcing ribs 500 with through holes 520. The through holes 520 are used to connect with the holes 21 on the middle plate 20 through the plastic 800. The through holes 520 on the reinforcing ribs 500 and the holes 21 on the middle plate 20 can increase the interlocking force between the plastic 800 and the reinforcing ribs 500 and the middle plate 20 respectively, thereby improving the connection stability between the middle plate 20 and the middle frame.
[0059] It should be noted that, see Figure 2 The structures extending inward from the top frame 100, bottom frame 200, left frame 300, and right frame 400 are all reinforced with ribs 500. The shape, size, and position of the reinforcing ribs 500 are designed according to the actual situation of the components located inside the top frame 100, bottom frame 200, left frame 300, and right frame 400. It is only necessary to avoid the components inside, and the shape of the reinforcing ribs 500 is not limited here.
[0060] For example, the plastic 800 is disposed between the reinforcing rib 500 and the middle plate 20 by filling. During the filling process, the plastic 800 completely fills the hole 21 and the through hole 520. The complete filling of the hole 21 and the through hole 520 by the plastic can enhance the interlocking force between the plastic 800 and the middle plate 20, the upper frame 100, the lower frame 200, the left frame 300 and the right frame 400 respectively, thereby improving the connection stability between the middle plate 20 and the middle frame.
[0061] In this embodiment of the disclosure, the plastic 800 can employ a reinforcing adhesive to improve the bonding stability between the middle frame and the middle plate 20. It is understood that the plastic 800 can be an insulating adhesive to achieve insulation between the middle frame and the middle plate 20.
[0062] This disclosure also provides a terminal device, which may include, but is not limited to, a portable Android device (PAD), a laptop computer, a personal digital assistant (PDA), a handheld device with wireless communication capabilities, a computing device, an in-vehicle device, a wearable device, a virtual reality (VR) terminal device, an augmented reality (AR) terminal device, a wireless terminal in industrial control, a wireless terminal in self-driving, a wireless terminal in remote medical care, a wireless terminal in a smart grid, a wireless terminal in transportation safety, a wireless terminal in a smart city, a wireless terminal in a smart home, and other mobile or fixed terminals.
[0063] In the manufacturing process, the middle frame structure 10 is first formed by 3D printing, then processed by CNC machining, and finally connected to the upper frame 100, lower frame 200, left frame 300, and right frame 400 by injection molding. It is understood that the manufacturing process of the middle frame structure 10 may also include heat treatment, sandblasting, and surface treatment, which will not be elaborated here.
[0064] Furthermore, the mid-frame structure 10 can be specifically realized using a 3D printing technology called SLM (Selective Laser Melting). Specifically, the three-dimensional digital model of the mid-frame structure 10 is sliced and layered using software to obtain the contour data of each cross-section. Then, a high-energy laser beam is used to selectively melt metal powder layer by layer according to the contour data. By layering powder, melting, solidifying, and stacking, a three-dimensional solid part of the mid-frame structure 10 is finally manufactured. It is understood that selective laser melting can form materials covering a wide range, including titanium and titanium alloys, high-temperature alloys, copper and copper alloys, stainless steel, mold steel, high-strength steel, and tungsten alloys. In other words, the material of the mid-frame structure 10 can include at least one of the aforementioned types. In traditional terminal equipment manufacturing processes, the conventional solution for the mid-frame involves a series of processes such as wire cutting of sheet metal and CNC milling. Traditional processes are not only inefficient but also generate a lot of waste and cause rapid tool wear, leading to increased costs. In this application, the mid-frame structure is first printed using 3D technology. Compared with traditional processes, this application can eliminate unnecessary processes, achieve a material utilization rate of over 95%, and reduce subsequent CNC machining time, thereby increasing efficiency and significantly reducing manufacturing costs.
[0065] The terminal device includes a display device, a back cover, and a mid-frame structure 10 as described in any of the preceding embodiments. The display device is disposed on one side of the mid-frame structure 10, and the back cover is disposed on the other side of the mid-frame structure 10. Thus, the terminal device can possess all the features and advantages of the mid-frame structure 10 described above. Specifically, by providing a hollow portion 510 on at least a portion of the reinforcing ribs 500 within the terminal device, the hollow portion 510 reduces the weight of the reinforcing ribs 500, thereby reducing the weight of the mid-frame structure 10, and further reducing the weight of the terminal device equipped with the mid-frame structure 10 of this disclosure embodiment. This allows the present disclosure embodiment to enhance the strength of the mid-frame structure 10 through the reinforcement ribs 500, and also to reduce the impact of the reinforcing ribs 500 on the weight of the mid-frame structure 10 by providing the hollow portion 510 on the reinforcing ribs 500. Furthermore, the hollowed-out portion 510 on the reinforcing rib 500 can enhance the strength of the upper frame 100, lower frame 200, left frame 300 and right frame 400, while preventing air from being blocked by the reinforcing rib 500 and thus ensuring the heat dissipation effect at the location where the reinforcing rib 500 is set on the middle frame structure 10.
[0066] It is understandable that the display device can be fixedly connected to the top bezel 100, bottom bezel 200, left bezel 300 and right bezel 400 respectively by means of adhesive, snap-fit, etc.
[0067] In this embodiment of the disclosure, there is a device mounting cavity between the back cover and the middle frame structure 10. A motherboard can be installed in the device mounting cavity, and components can also be installed in the device mounting cavity. The components can be disposed on the motherboard and electrically connected to the motherboard. Various different components can be installed on the motherboard, and the different components installed on the motherboard can be electrically connected through the motherboard.
[0068] It is understandable that components may include, but are not limited to, chips, cameras, microphones, earpieces, and batteries. Chips may include central processing units (CPUs), graphics processing units (GPUs), and memory.
[0069] In some embodiments of this disclosure, the terminal device is a non-foldable terminal device, such as a tablet computer. When the terminal device is a non-foldable terminal device, it may include multiple mid-frame components.
[0070] It is understood that when the terminal device is a foldable device, the terminal device may include two, three, four or more mid-frame structures 10. When the terminal device is in a flattened state, all mid-frame structures 10 are arranged along the length or width direction of the terminal device.
[0071] In the description of this specification, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this disclosure.
[0072] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this disclosure, "multiple" means two or more, unless otherwise explicitly specified.
[0073] In this disclosure, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this disclosure according to the specific circumstances.
[0074] In this disclosure, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.
[0075] The foregoing disclosure provides many different implementations or examples for carrying out different structures of this disclosure. To simplify the disclosure, specific examples of components and arrangements have been described above. Of course, these are merely examples and are not intended to limit the scope of this disclosure. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various implementations and / or arrangements discussed.
[0076] The above description is merely a specific embodiment of this disclosure, but the scope of protection of this disclosure is not limited thereto. Any person skilled in the art can easily conceive of various variations or substitutions within the technical scope disclosed in this disclosure, and these should all be included within the scope of protection of this disclosure. Therefore, the scope of protection of this disclosure should be determined by the scope of the claims.
Claims
1. A 3D-printed mid-frame structure, characterized in that, include: Top border, bottom border, left border, and right border; Multiple reinforcing ribs are spaced apart on the inner side of each frame; At least some of the reinforcing ribs have openwork sections.
2. The middle frame structure according to claim 1, characterized in that, The left frame has a hollowed-out section on one of its reinforcing ribs, and the right frame has two reinforcing ribs, each with a hollowed-out section.
3. The middle frame structure according to claim 2, characterized in that, The cutout on the left frame is located in the middle of the left frame; One of the two cutouts on the right side frame is located at the end of the right side frame, and the other cutout is positioned opposite to the cutout on the left side frame.
4. The middle frame structure according to claim 1, characterized in that, Both ends of the left frame are provided with a reinforcing rib with a hollowed-out section; Both ends of the right frame are provided with a reinforcing rib with a hollowed-out section.
5. The middle frame structure according to claim 3 or 4, characterized in that, Each cutout section has a mesh structure, with the cutouts being triangular in shape.
6. The middle frame structure according to claim 1, characterized in that, The middle frame structure has multiple antenna slots arranged circumferentially.
7. The middle frame structure according to claim 6, characterized in that, The distance L1 between the two antenna slots on the upper frame is greater than the distance L2 between the two antenna slots on the lower frame, and the distance L3 between the two antenna slots on the left frame is less than the distance L4 between the two antenna slots on the right frame.
8. The middle frame structure according to claim 1, characterized in that, A gap is provided between each of the reinforcing ribs for connection to the middle plate via plastic.
9. The middle frame structure according to claim 1, characterized in that, Each frame has at least some reinforcing ribs with through holes for connection to holes in the middle plate via plastic.
10. A terminal device, characterized in that, It includes a display device, a back cover, and a mid-frame structure as described in any one of claims 1-9; the display device is disposed on one side of the mid-frame structure, and the back cover is disposed on the other side of the mid-frame structure.