Circuit board assembly and terminal equipment

Abstract

The utility model provides a circuit board assembly and terminal equipment. The circuit board assembly comprises a PCB, an FPC board, a board-to-board connector and a pressing assembly. And one side of the board-to-board connector is fixedly connected with the PCB, and the other side of the board-to-board connector is fixedly connected with the connecting part of the FPC board. The pressing assembly comprises a pressing piece, the pressing piece comprises a first locking part, a reinforcing part and a second locking part, and the first locking part and the second locking part are fixedly connected to the PCB so that the reinforcing part can press the connecting part of the FPC and the board-to-board connector to the PCB. The reinforcing part is provided with a bottom surface facing the PCB, the connecting part of the FPC is provided with a top surface deviating from the PCB, and the bottom surface of the reinforcing part and the top surface of the connecting part are oppositely arranged and abut against each other. According to the circuit board assembly provided by the embodiment of the invention, the connection strength of the board-to-board connector can be ensured, the thickness space of a whole machine can be saved, the weight of the whole machine is reduced, and the light-weight and small-size development of terminal equipment is facilitated.

Description

Technical Field

[0001] This application relates to the field of BTB connectors, and more particularly to a circuit board assembly and terminal device. Background Technology

[0002] BTB connectors, or board-to-board connectors, are a commonly used connector type. BTB connectors offer strong transmission capabilities and are widely used in terminal devices such as mobile phones, computers, and tablets. Components such as displays, touchscreens, and cameras are electrically connected to PCBs (Printed Circuit Boards) via FPCs (Flexible Printed Circuits), and BTB connectors can be used to connect FPCs and PCBs. However, as terminal devices continue to evolve towards lighter, smaller, and more compact designs, the installation space for BTB connectors is becoming increasingly limited. Terminal devices typically require dozens of BTB connectors, which occupy a significant amount of space and weight, hindering the lightweighting and miniaturization of terminal devices.

[0003] Existing BTB connectors generally consist of a male connector socket and a female connector socket. These are fixedly connected to the PCB board and FPC board respectively, and then fastened together to achieve electrical connection and signal interface between the PCB and FPC boards. After assembly, BTB connectors are prone to loosening due to space constraints and the tension of the FPC board, especially in scenarios involving drops or minor movements. This can lead to the male and female connector sockets separating, causing partial or complete failure of the terminal device. To address this, most products add a reinforcing steel plate on top of the FPC board, then secure it to the PCB board or mid-frame using a clamping assembly. The high rigidity of the reinforcing steel plate strengthens the FPC board structure, effectively reducing the risk of BTB connector loosening. However, the reinforcing steel plate occupies additional thickness space and adds weight, increasing the overall thickness and weight of the device, which is detrimental to weight reduction and thinning designs.

[0004] Therefore, existing technologies sacrifice the thickness and weight of the entire device to ensure the connection strength of the BTB connector, which affects the lightweighting and miniaturization of terminal equipment. Utility Model Content

[0005] The circuit board assembly and terminal device provided in this application embodiment solve the problem in the prior art that the connection strength of the BTB connector is guaranteed by sacrificing the thickness and weight of the whole machine, which affects the lightweight and miniaturization of the terminal device.

[0006] A first aspect of this application provides a circuit board assembly, including a PCB board, an FPC board, a board-to-board connector, and a clamping assembly. The FPC board includes a body portion and a connecting portion disposed at opposite ends, and the connecting portion is fixedly connected to the PCB board. In the thickness direction of the board-to-board connector, one side of the board-to-board connector is fixedly connected to the PCB board, and the other side is fixedly connected to the connecting portion of the FPC board.

[0007] The clamping assembly includes a clamping plate, which includes a first locking part, a reinforcing part, and a second locking part that are sequentially connected along the length of the board-to-board connector. The first locking part and the second locking part are respectively fixedly connected to the PCB board through corresponding locking structures, so that the reinforcing part of the clamping plate clamps the connecting part of the FPC board and the board-to-board connector to the PCB board. In the thickness direction of the board-to-board connector, the reinforcing part has a bottom surface facing the PCB board, and the connecting part of the FPC board has a top surface facing away from the PCB board. The bottom surface of the reinforcing part and the top surface of the connecting part are disposed opposite to each other and abut against each other.

[0008] The circuit board assembly provided in this application embodiment achieves electrical connection and signal interface between a PCB (printed circuit board) and an FPC (flexible printed circuit board) through a board-to-board connector. The FPC board includes a body and a connecting part. The body is mainly used for signal transmission, while the connecting part is used to connect to the PCB board. The board-to-board connector is fixed to the connecting part. Furthermore, the FPC board, the board-to-board connector, and the PCB board are stacked along the thickness direction of the board-to-board connector. The clamping plate of the clamping assembly presses the FPC board onto one side of the PCB board, simultaneously clamping the board-to-board connector located between the FPC board and the PCB board to prevent the connector from loosening.

[0009] The clamping assembly includes a first locking part, a reinforcing part, and a second locking part. The first and second locking parts are used to fix the clamping plate to the PCB board, securing it to the PCB. The reinforcing part is pressed onto the connecting part of the FPC board, with its bottom surface facing and abutting against the top surface of the connecting part; or, in other words, the reinforcing part directly abuts against the facing surface of the FPC board. On one hand, the reinforcing part presses the connecting part and the board-to-board connector against one side of the PCB board. On the other hand, the reinforcing part on the clamping plate replaces the traditional reinforcing steel sheet, strengthening the structure of the connecting part, ensuring uniform force distribution, and uniform overall downward pressure, thus guaranteeing the meshing strength of the male and female connectors within the board-to-board connector. Alternatively, the clamping plate combines the clamping function with the reinforcing function of the traditional reinforcing steel sheet, eliminating the need for a traditional reinforcing steel sheet while ensuring the connection strength of the board-to-board connector, thereby saving space and reducing weight.

[0010] Therefore, the circuit board assembly provided in this application embodiment can not only ensure the connection strength of the board-to-board connector, but also save the thickness space of the whole machine and reduce the weight of the whole machine, which is conducive to the lightweight and miniaturization of terminal equipment.

[0011] In one possible implementation, the bottom surface of the reinforcement covers the top surface of the connection in a plane perpendicular to the thickness direction of the board-to-board connector.

[0012] The reinforcing part covers the entire top surface of the connector. The pressure applied by the clamping plate can be evenly transmitted to the top surface of the connector through the reinforcing part. Under the pressure of the clamping plate, the entire top surface is recessed towards the PCB board, so that the force is evenly distributed throughout the board-to-board connector, further strengthening the connection strength of the board-to-board connector.

[0013] In one possible implementation, the bottom surface shape of the reinforcement matches the top surface shape of the connector.

[0014] By adopting the above solution, the bottom area of ​​the reinforcement can be effectively utilized, and the reinforcement can easily cover the top surface of the connection.

[0015] In one possible implementation, the clamping plate is designed as a one-piece sheet structure. This one-piece structure offers higher strength, preventing the clamping plate from breaking or deforming due to fatigue. The sheet structure is also thinner and easier to manufacture.

[0016] In one possible implementation, the clamping plate is made of metal. Metal has high strength and can withstand long-term stress. Furthermore, metal has good ductility, making it easy to process.

[0017] In one possible implementation, in the thickness direction of the board-to-board connector, the first and second locking portions of the clamping plate are located on the side of the reinforcing portion closer to the PCB board.

[0018] With the above solution, the first locking part and the second locking part are recessed towards the side closer to the PCB board relative to the reinforcing part, so that space can be reserved for the locking structure on the side of the locking part away from the PCB board, avoiding the locking structure from protruding from the surface of the reinforcing part away from the PCB board and increasing the additional thickness.

[0019] In one possible implementation, the clamping component further includes:

[0020] The first locking structure includes a plug-in part and a plugged-in part. The plug-in part is disposed on the first locking part, and the plugged-in part is fixedly disposed on the PCB board. The plugged-in part is provided with a slot. The plug-in part is at least partially inserted into the slot, so that the first locking part is locked and fixed to the PCB board by the first locking structure.

[0021] The second locking structure includes a first connecting hole, a second connecting hole, and a fastener. The first connecting hole is located in the second locking part, and the second connecting hole is located on the PCB board. The fastener passes through the first connecting hole and is fixed inside the second connecting hole, so that the second locking part is locked and fixed to the PCB board by the second locking structure.

[0022] Using the above solution, one locking part of the clamping plate is fixed to the PCB board via a plug-in connection, while the other locking part is fixed to the PCB board via fasteners. This ensures connection strength and allows for more convenient and faster assembly. For example, the plug-in part of the first locking part can be inserted into the slot first to initially limit the clamping plate's position. Then, the first and second connecting holes can be aligned, and the fasteners can be inserted into the connecting holes and tightened to secure it. This makes the operation even more convenient.

[0023] In one possible implementation, the first locking part is configured as a sheet structure and integrally forms the insertion part of the first locking structure; the insertion part includes a top plate, a first side wall, a second side wall, and a third side wall. The top plate and the PCB board are spaced apart in the thickness direction of the board-to-board connector. The first side wall and the second side wall are respectively connected to the two sides of the top plate in the width direction of the board-to-board connector. The third side wall is connected to the side of the top plate away from the second locking structure in the length direction of the board-to-board connector. One end of each of the first side wall, the second side wall, and the third side wall is connected to the top plate in the thickness direction of the board-to-board connector, and the other end is fixedly connected to the PCB board, so that the top plate, the first side wall, the second side wall, and the third side wall surround to form a slot;

[0024] The second locking part is configured as a sheet-like structure, and the first connecting hole of the second locking structure penetrates the second locking part in the thickness direction of the board-to-board connector.

[0025] Using the above scheme and structure, the first locking part can be directly inserted into the slot without the need for an additional insertion part, thus simplifying the shape and construction of the first locking part. The slot for the insertion part is formed by a top plate and three side walls, resulting in a simple structure that is easy to manufacture. The second locking part is designed as a sheet-like structure, which is thin, making it easy to drill holes and saving thickness space.

[0026] A second aspect of this application provides a terminal device including the circuit board assembly provided in any of the above embodiments. The terminal device provided in this application features a stable and reliable connection between the FPC board and the PCB board, and the overall device is thinner and lighter.

[0027] In one possible implementation, there are multiple circuit board assemblies, with each circuit board assembly having its own PCB board, or at least two circuit board assemblies sharing a common PCB board.

[0028] In one possible implementation, the terminal device is a foldable terminal device. Attached Figure Description

[0029] Figure 1 This is an exploded view of the terminal device according to an embodiment of this application;

[0030] Figure 2 This is a schematic diagram of the terminal device in the unfolded state according to an embodiment of this application;

[0031] Figure 3 This is a schematic diagram of the terminal device in the folded state according to an embodiment of this application;

[0032] Figure 4 This is a schematic diagram of the electrical connections of the terminal device in an embodiment of this application;

[0033] Figure 5a A schematic diagram of the circuit board assembly in a reference design. Figure 1 ;

[0034] Figure 5b A schematic diagram of the circuit board assembly in a reference design. Figure 2 ;

[0035] Figure 6 This is a schematic diagram of the circuit board assembly in an embodiment of this application.

[0036] Figure 7a This is a top view of the clamping sheet in the circuit board assembly according to an embodiment of this application. Figure 1 ;

[0037] Figure 7b This is a top view of the clamping sheet in the circuit board assembly according to an embodiment of this application. Figure 2 ;

[0038] Figure 7c This is a top view of the clamping sheet in the circuit board assembly according to an embodiment of this application. Figure 3 ;

[0039] Figure 8 This is an exploded view of the circuit board assembly according to an embodiment of this application;

[0040] Figure 9 This is a top view of the circuit board assembly according to an embodiment of this application;

[0041] Figure 10 This is a three-dimensional structural diagram of the circuit board assembly according to an embodiment of this application.

[0042] Explanation of reference numerals in the attached figures:

[0043] Reference Design:

[0044] 200', Circuit board assembly;

[0045] 5' PCB board;

[0046] 6', FPC board; 61', body; 62', connecting part; 621', top surface;

[0047] 7', Board-to-board connector; 71', Male connector socket; 72', Female connector socket;

[0048] 8', Clamping assembly; 81', Clamping plate; 91', Locking element; 92', Reinforcing steel plate.

[0049] This application:

[0050] 100. Terminal equipment;

[0051] 1. Display screen; 11. First part; 12. Second part; 13. Foldable part; 14. Display FPC module;

[0052] 2. Housing assembly; 21. First housing; 211. First middle frame; 212. First front shell;

[0053] 22. Second housing; 221. Second middle frame; 222. Second front housing; 23. Hinge assembly;

[0054] 31. Mainboard; 32. First sub-board; 33. Second sub-board; 34. Third sub-board;

[0055] 41. First FPC board; 411. First board-to-board connector; 412. Second board-to-board connector;

[0056] 42. Second FPC board; 421. Third board-to-board connector; 422. Fourth board-to-board connector;

[0057] 43. Third FPC board; 431. Fifth board-to-board connector; 432. Sixth board-to-board connector;

[0058] 44. Camera module; 441. Camera FPC board; 442. Seventh board to board connector;

[0059] 45. Battery module; 451. Battery FPC board; 452. Eighth board to board connector;

[0060] 200. Circuit board assembly;

[0061] 5. PCB board;

[0062] 6. FPC board; 61. Body; 62. Connecting part; 621. Top surface;

[0063] 7. Board-to-board connector; 71. Connector male socket; 711. Male terminal base; 712. Male signal terminal; 7121. Male signal insertion part;

[0064] 72. Connector female socket; 721. Female end base; 722. Female socket signal terminal; 7221. Female end signal contact;

[0065] 8. Clamping assembly; 81. Clamping plate; 811. Reinforcing part; 8111. Bottom surface; 812. First locking part; 813. Second locking part;

[0066] 91. First locking structure; 911. Insertion part; 912. Inserted part; 9120. Slot;

[0067] 9121. Top plate; 9122. First side wall; 9123. Second side wall; 9124. Third side wall;

[0068] 92. Second locking structure; 921. First connecting hole; 922. Second connecting hole; 923. Fastener;

[0069] Z represents the thickness direction of the board-to-board connector; X represents the length direction of the board-to-board connector; Y represents the width direction of the board-to-board connector. Detailed Implementation

[0070] The following specific embodiments illustrate the implementation of this application. Those skilled in the art can easily understand other advantages and effects of this application from the content disclosed in this specification. Although the description of this application will be presented in conjunction with some embodiments, this does not mean that the features of this application are limited to this embodiment. On the contrary, the purpose of describing the application in conjunction with embodiments is to cover other options or modifications that may be derived based on the claims of this application. To provide a thorough understanding of this application, many specific details will be included in the following description. This application may also be implemented without using these details. Furthermore, to avoid confusion or obscuring the focus of this application, some specific details will be omitted in the description. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other.

[0071] It should be noted that in this specification, similar reference numerals and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0072] The following explains the terminology that may appear in the embodiments of this application.

[0073] In the description of this application, it should be noted that the terms "center," "upper," "lower," "top," "bottom," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application 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, and therefore should not be construed as a limitation on this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0074] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0075] The limitations mentioned in the embodiments of this application, such as parallel, perpendicular, and identical (e.g., identical length, identical width, etc.), are all relative to the current technological level, rather than absolute and strict definitions in a mathematical sense.

[0076] In the description of this application, it should be understood that "electrical connection" can be understood as physical contact and electrical conduction between components; it can also be understood as the form in which different components in a circuit structure are connected through physical lines that can transmit electrical signals, such as printed circuit boards (PCBs), flexible printed circuit boards (FPCs), copper foils, or wires.

[0077] Relative / Relative Setting: A relative setting with B can refer to A and B being face-to-face. For example, when two components are set relative to each other, these two components overlap in at least a portion of their area along a certain direction.

[0078] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0079] BTB connectors, or Board-to-Board Connectors, are a commonly used connector type. BTB connectors offer strong transmission capabilities and are widely used in terminal devices such as mobile phones, computers, and tablets. For example, components such as displays, touchscreens, and cameras can be electrically connected to PCBs via FPC boards, and BTB connectors can be used to connect the FPC boards and PCBs. Terminal devices typically require dozens of BTB connectors, which occupy considerable space and weight. Therefore, the installation and design of BTB connectors are important factors influencing the lightweighting, miniaturization, and compactness of terminal devices.

[0080] This application provides a terminal device, which can be a common terminal such as a mobile phone, computer, tablet computer, television, or smartwatch; this application does not limit the type of terminal device. The terminal device can be a non-foldable device, such as a regular non-foldable mobile phone, or a foldable terminal device, such as a foldable mobile phone or foldable tablet computer; this application does not limit the type of terminal device. In one possible implementation, the terminal device is a foldable terminal device. The structure of a foldable terminal device is described below using a foldable mobile phone as an example.

[0081] Please see Figures 1 to 4 , Figure 1 This is an exploded view of the terminal device according to an embodiment of this application; Figure 2 This is a schematic diagram of the terminal device in the unfolded state according to an embodiment of this application; Figure 3 This is a schematic diagram of the terminal device in the folded state according to an embodiment of this application; Figure 4 This is a schematic diagram of the electrical connections of the terminal device in an embodiment of this application.

[0082] like Figures 1 to 4 As shown, the terminal device 100 includes a display screen 1 and a housing assembly 2, with the display screen 1 disposed on one side of the housing assembly 2. The housing assembly 2 is used to support and accommodate the display screen 1 and other electronic components. In one possible implementation, the housing assembly 2 includes a first housing 21, a second housing 22, and a hinge device 23. The first housing 21 and the second housing 22 are rotatably connected by the hinge device 23, allowing the foldable terminal device 100 to switch between a folded state and an unfolded state. Both the first housing 21 and the second housing 22 have internal accommodating spaces to accommodate various electronic components. These electronic components include, but are not limited to, circuit boards, batteries, camera modules 44, microphones, and speakers.

[0083] Terminal device 100 has a folded state and an unfolded state, for example, such as Figure 2As shown, when the foldable terminal is in the unfolded state, its opening angle is 180°, that is, the angle between the first housing 21 and the second housing 22 is 180°. Those skilled in the art will understand that the opening angle of the foldable terminal can also be 90°, 120°, 210°, etc., and this application does not limit this. Furthermore, the angles illustrated in this application are allowed to have slight deviations. For example, when the foldable terminal is in the unfolded state, its opening angle can be 180°, or approximately 180°, such as 170°, 175°, 185°, or 190°, etc. Other angles can be understood similarly below. When the first housing 21 and the second housing 22 rotate relative to each other to overlap, the terminal device 100 presents... Figure 3 The closed state shown in the figure indicates that the angle between the first housing 21 and the second housing 22 can be approximated as 0°. Those skilled in the art will understand that the terminal device 100 shown in the figure is a double-folding device with two housings. In some possible implementations, the terminal device 100 can also be a triple-folding device (with three housings) or a multi-folding terminal device 100. This application embodiment does not limit this.

[0084] The display screen 1 is used for image display and human-computer interaction, and may be, but is not limited to, an organic light-emitting diode (OLED) display screen 1, an active-matrix organic light-emitting diode (AMOLED) display screen, or a quantum dot light-emitting diode (QLED) display screen, etc. The embodiments of this application do not limit the type and specific structure of the display screen 1.

[0085] In one possible implementation, the display screen 1 includes a first part 11, a second part 12, and a foldable part 13. The first part 11 is fixedly connected to a first housing 21, the second part 12 is fixedly connected to a second housing 22, and the foldable part 13 is located between the first part 11 and the second part 12, and is stacked with a hinge device 23. During use, the first part 11 and the second part 12 remain in a planar state, while the foldable part 13 can be bent to change the angle between the first part 11 and the second part 12, so that the display screen 1 folds or unfolds with the movement of the housing assembly 2. For example, the foldable part 13 can be made of a flexible material so that it can be bent. It should be noted that the terminal device 100 can be an inward-folding terminal or an outward-folding terminal, and this application does not limit this. If the terminal device 100 is an inward-folding terminal, when it is in the folded state, the housing assembly 2 surrounds the outer side of the display screen 1 (e.g., Figure 4 (As shown). If the terminal device 100 is an outward-folding terminal, when it is in the folded state, the display screen 1 is located on the outside of the housing assembly 2.

[0086] It should be noted that the specific structures of the first shell 21 and the second shell 22 are not limited. For example... Figure 1 As shown, in one possible implementation, the first housing 21 includes a first middle frame 211 and a first front housing 212 stacked together, and the second housing 22 includes a second middle frame 221 and a second front housing 222 stacked together. The first front housing 212 and the second front housing 222 constitute the front housing, and the first middle frame 211 and the second middle frame 221 constitute the middle frame. The front housing is fixedly connected to the middle frame, and the display screen 1 is disposed between the front housing and the middle frame in the first direction Z, with the front housing covering the outer periphery of the display screen 1.

[0087] like Figure 1 As shown, in one possible implementation, both the first part 11 and the second part 12 of the display screen 1 are provided with display FPC modules 14. Each display FPC module 14 can house multiple display FPC boards. The display screen 1 is electrically connected and transmits signals to the PCB board 5 (e.g., motherboard and sub-board) of the terminal device 100 through the display FPC modules 14. For example, the display FPC module 14 can be located below the side edge of the display screen 1 (near the middle frame), with the front cover pressed against the outer edge of the display screen 1. This protects and secures the outer edge of the display screen 1 and also hides the display FPC module 14. In some possible implementations, the front cover may be omitted, and the display FPC module 14 may be directly hidden within the side frame of the middle frame. This embodiment does not limit this implementation.

[0088] Those skilled in the art will understand that the display screen 1 has a display area comprising multiple pixels. The PCB board may include display driver circuitry for driving the multiple pixels to display, such as a display driver integrated circuit (DDIC). The display driver chip can be connected to the multiple pixels of the display screen 1 via the display FPC module 14. The PCB board may also include an application processor (AP) and a power management chip (power IC). The power management chip provides operating voltage to the display driver chip, and the processor provides display data to the display driver chip. The display driver chip can receive signals containing display data sent by the processor, and then transmit the signals to the display screen 1 according to a specific timing control via the display FPC module 14.

[0089] Those skilled in the art will understand that each display FPC board in the display FPC module 14 serves as a bridge for signal transmission between the PCB board and the display screen 1. Both ends of the display FPC board need to be connected to the display screen 1 and the PCB board respectively, and the specific connection method is not limited. In one possible implementation, one end of the display FPC board in the display FPC module 14 can be connected to the display screen 1 through anisotropic conductive film, thermoforming bonding, connector insertion, etc., while the other end is connected to the PCB through a board-to-board connector (the board-to-board connector between the PCB board and the display FPC board is not shown in the figure). The board-to-board connector provides high connection strength and stability, ensuring the normal operation of the display screen 1. In some possible implementations, the PCB board and the display FPC board can also be connected through other types of connectors or other connection methods; this embodiment does not limit this.

[0090] Those skilled in the art will understand that the foldable terminal device 100 generally has one or more PCB boards, such as a main board 31 and sub-boards. The main board 31 has the most components and the largest layout area, while the others are sub-boards. The number of sub-boards is not limited, and both the main board 31 and the sub-boards can be housed within any one of the casings of the foldable terminal device 100; this application embodiment does not impose any limitation on this. Figure 4 As shown, in one possible implementation, the foldable terminal device 100 includes a main board 31 and three sub-boards, wherein the main board 31 and the first sub-board 32 are disposed in the first housing 21, and the second sub-board 33 and the third sub-board 34 are disposed in the second housing 22.

[0091] The motherboard 31 carries the core computing functions of the foldable terminal device 100. Generally, a system-on-chip (SoC) is provided on the motherboard 31, and the application processor is located within the SoC. The display driver chip and power management chip can be located on the motherboard 31 or on a sub-board; this embodiment does not limit this. The foldable terminal device 100 can have multiple display driver chips and / or multiple power management chips, which can be distributed across the motherboard 31 and sub-boards; this embodiment does not limit this. The foldable terminal device 100 may also include a charge / discharge management module, an audio module, an image processing module, etc., which can exist in the form of chips or circuits on the motherboard 31 and various sub-boards; this embodiment does not limit this.

[0092] Those skilled in the art will understand that a connection is also required between the mainboard 31 and the sub-board. For example... Figure 4As shown, in one possible implementation, the motherboard 31 and the first sub-board 32 are connected via a first FPC board 41, enabling electrical connection and signal transmission between the motherboard 31 and the first sub-board 32. The connection method between the first FPC board 41 and the motherboard 31 and the first sub-board 32 is not limited. In another possible implementation, both ends of the first FPC board 41 are connected to the motherboard 31 and the first sub-board 32 respectively via a board-to-board connector 7. For ease of distinction, the board-to-board connector between the first FPC board 41 and the motherboard 31 is referred to as the first board-to-board connector 411, and the board-to-board connector between the first FPC board 41 and the first sub-board 32 is referred to as the second board-to-board connector 412.

[0093] like Figure 4 As shown, in one possible implementation, the motherboard 31 and the second sub-board 33 are connected via a second FPC board 42, enabling electrical connection and signal transmission between the motherboard 31 and the second sub-board 33. The connection method between the second FPC board 42 and the motherboard 31 and the second sub-board 33 is not limited. In another possible implementation, both ends of the second FPC board 42 are connected to the motherboard 31 and the second sub-board 33 respectively via a board-to-board connector. For ease of distinction, the board-to-board connector between the second FPC board 42 and the motherboard 31 is referred to as the third board-to-board connector 421, and the board-to-board connector between the second FPC board 42 and the second sub-board 33 is referred to as the fourth board-to-board connector 422.

[0094] like Figure 4 As shown, in one possible implementation, the second sub-board 33 and the third sub-board 34 are connected via a third FPC board 43, achieving electrical connection and signal transmission between them. The connection method between the third FPC board 43 and the second and third sub-boards 33 is not limited. In another possible implementation, both ends of the third FPC board 43 are connected to the second sub-board 33 and the third sub-board 34 respectively via a board-to-board connector. For ease of distinction, the board-to-board connector between the third FPC board 43 and the second sub-board 33 is referred to as the fifth board-to-board connector 431, and the board-to-board connector between the third FPC board 43 and the third sub-board 34 is referred to as the sixth board-to-board connector 432.

[0095] like Figure 4As shown, in one possible implementation, the terminal device 100 further includes a camera module 44, which is installed inside the first housing 21 and connected to the motherboard 31 via a camera FPC board 441. The motherboard 31 has an image processing module, and the camera FPC board 441 can establish a connection between the camera module 44 and the image processing module, processor, etc., on the motherboard 31, thereby controlling the camera module 44 to take pictures. Placing the motherboard 31 and the camera module 44 in the same housing shortens the transmission link between them and improves the image processing speed of the device. The camera module 44 can also be placed in the second housing 22; this embodiment does not limit this. The camera module 44 can also be connected to other sub-boards; this embodiment does not limit this. The connection method between the camera FPC board 441 and the motherboard 31 and the camera module 44 is not limited. In one possible implementation, one end of the camera FPC board 441 can be connected to the camera module 44 via soldering, plugging, gold finger connection, connector connection, etc., and the other end can be connected to the motherboard 31 via a board-to-board connector. For ease of distinction, the board-to-board connector 7 between the camera FPC board 441 and the motherboard 31 is referred to as the seventh board-to-board connector 442.

[0096] like Figure 4 As shown, in one possible implementation, the terminal device 100 further includes a battery module 45, which can supply power to various electronic components in the foldable terminal device 100. In one possible implementation, the battery module 45 is connected to a second sub-board 33 via a battery FPC board 451. The second sub-board 33 can be equipped with a charge / discharge management circuit and an external charging interface, thereby enabling charging and discharging of the battery module 45. The battery module 45 can also be connected to the main board 31, the first sub-board 32, or the third sub-board 34; this embodiment does not limit this. The connection method between the battery FPC board 451, the second sub-board 33, and the battery module 45 is not limited. In one possible implementation, one end of the battery FPC board 451 can be connected to the battery module 45 via soldering, plugging, gold finger connection, connector connection, etc., and the other end is connected to the second sub-board 33 via a board-to-board connector. For ease of distinction, the board-to-board connector between the battery FPC board 451 and the second sub-board 33 is referred to as the eighth board-to-board connector 452.

[0097] Those skilled in the art will understand that the terminal device 100 may also include various antennas, such as satellite communication antennas and cellular antennas. The main board 31 and sub-boards are equipped with radio frequency modules (e.g., radio frequency chips) corresponding to each antenna to transmit radio frequency signals to each antenna. Each antenna can also be connected to the main board 31 or any sub-board via an FPC board, thereby establishing a connection with the corresponding radio frequency module.

[0098] In addition, the terminal device 100 may also include speaker modules, horn modules, etc. The speaker modules and horn modules can also be connected to the main board 31 or any sub-board via FPC boards, thereby establishing a connection with the audio processing module. The terminal device 100 may also include more electronic components, and various electronic components can be connected to the main board 31 or sub-board via FPC boards, and the FPC boards and corresponding PCB boards of each electronic component can be connected to each other via board-to-board connectors.

[0099] Those skilled in the art will understand that the terminal device 100 has complex functions, numerous electronic components, and requires a large number of connectors. Smart devices such as mobile phones and computers can have dozens of board-to-board connectors. The board-to-board connectors between the FPC and PCB described above, and those shown in the figure, number over a dozen. Each board-to-board connector (and its corresponding accessories, such as the clamping components and reinforcing steel plates described later) occupies space and has weight, significantly impacting the overall weight and volume of the device. It is understood that board-to-board connectors, PCBs, and FPCs are generally stacked along the thickness direction of the terminal device 100; therefore, the arrangement of the board-to-board connectors significantly affects the thickness of the terminal device 100. Specifically, the thickness direction of the PCB corresponds to the thickness direction Z of the board-to-board connectors. For a non-foldable terminal device 100, the thickness direction of the PCB and the thickness direction Z of the board-to-board connectors are the same as the overall thickness direction of the terminal device 100. Figures 1 to 4 In the case of the foldable terminal device 100 shown, the thickness direction of the PCB board and the thickness direction Z of the board-to-board connectors are consistent with the thickness direction of their respective housings. It is understandable that an increase in the thickness of any housing will lead to an increase in the overall thickness of the foldable terminal device 100 in the folded state. Multiple board-to-board connectors are distributed in different housings. If the board-to-board connectors occupy too much thickness space, it will be very detrimental to the overall thin and light design of the device.

[0100] Please see Figures 5a to 5b , Figure 5a A schematic diagram of the circuit board assembly in a reference design. Figure 1 ; Figure 5b A schematic diagram of the circuit board assembly in a reference design. Figure 2 .

[0101] like Figures 5a to 5bAs shown, in one reference design, the circuit board assembly 200' includes a PCB board 5' and an FPC board 6'. The FPC board 6' includes a body portion 61' and a connecting portion 62', wherein the body portion 61' is the main part of the FPC board 6', and the connecting portion 62' is used to connect to the PCB board 5'. The connecting portions 62' of the PCB board 5' and the FPC board 6' are stacked and connected by a board-to-board connector 7' disposed between them. The board-to-board connector 7' includes a male connector 71' and a female connector 72'. The male connector 71' is fixedly connected to the connecting portion 62' of the FPC board 6', and the female connector 72' is fixedly connected to the PCB board 5'. The male connector 71' and the female connector 72' are fastened together to realize the electrical connection and signal interface between the PCB board 5' and the FPC board 6'.

[0102] The circuit board assembly 200' also includes a clamping assembly 8', which includes a clamping plate 81' and two locking members 91'. The clamping plate 81' is positioned above the connecting portion 62' of the FPC board 6', and is fixedly connected to the PCB board 5' by the locking members 91', pressing it downward against the connecting portion 62'. This indirectly applies pressure to the board-to-board connector 7', preventing the connector from loosening due to pulling on the FPC board 6' (e.g., drops, micro-motions, etc.), i.e., preventing the male connector 71' and the female connector 72' from separating from each other. Those skilled in the art will understand that the FPC board 6' as a whole adopts a flexible structure, and its connecting portion 62' is also a flexible structure. The side of the connecting part 62' facing the clamping plate 81' is the top surface 621'. If local pressure is applied to the top surface 621' of the connecting part 62', the top surface 621' will sink in a localized manner, resulting in uneven force distribution. The board-to-board connector 7' will also experience uneven force distribution, leading to a high risk of loosening or slippage. In actual production, the specifications of the clamping plate 81' are relatively uniform. If the clamping plate 81' is used to directly apply pressure to the top surface 621' of the connecting part 62' of the FPC board 6', uneven force distribution often occurs. Therefore, a reinforcing steel sheet 92' is also provided between the top surface 621' of the connecting part 62' and the clamping plate 81'. The reinforcing steel sheet 92' covers the top surface 621' of the connecting part 62', and the clamping plate 81' applies pressure to the reinforcing steel sheet 92'. Then, the pressure is transmitted to the entire top surface 621' through the reinforcing steel sheet 92', causing the top surface 621' to sink as a whole. This results in more even force distribution on the board-to-board connector 7' and higher connection reliability. Alternatively, it can be understood that the high-strength reinforcing steel sheet 92' strengthens the structure of the FPC board 6', effectively reducing the risk of connector loosening.

[0103] However, the reinforcing steel sheet 92' occupies additional thickness space of the whole machine and has a certain weight, which increases the thickness and weight of the whole machine. The total weight of all the reinforcing steel sheets in the terminal equipment can reach more than 0.5g, which is very unfavorable to the overall weight reduction and thinning design of the machine.

[0104] Therefore, this application provides a circuit board assembly that can ensure the connection strength of the board-to-board connector while reducing the weight and thickness of the terminal device.

[0105] Please see Figure 6 , Figure 6 This is a schematic diagram of the circuit board assembly in an embodiment of this application.

[0106] like Figure 6 As shown, the circuit board assembly 200 includes a PCB board 5, an FPC board 6, a board-to-board connector 7, and a clamping assembly 8. The FPC board 6 includes a body portion 61 and a connecting portion 62 that are connected to each other (see reference). Figure 7a The connecting part 62 is fixedly connected to the PCB board 5. In the thickness direction Z of the board-to-board connector, one side of the board-to-board connector 7 is fixedly connected to the PCB board 5, and the other side is fixedly connected to the connecting part 62 of the FPC board 6.

[0107] The main body 61 of the FPC board 6 is mainly used for signal transmission, and its interior may include multiple transmission lines, for example. The connecting part 62 is used to connect with the PCB board 5, and the board-to-board connector 7 can be fixed to the connecting part 62 by soldering or the like.

[0108] The thickness direction Z of the board-to-board connector can, for example, be the thickness direction of the PCB board 5. Figure 4 As shown, the thickness directions of the first board-to-board connector 411, the third board-to-board connector 421, and the seventh board-to-board connector 442 can, for example, be consistent with the thickness directions of the main board 31 and the first housing 21. The thickness direction of the second board-to-board connector 412 can, for example, be consistent with the thickness directions of the first sub-board 32 and the first housing 21. The thickness directions of the fourth board-to-board connector 422, the fifth board-to-board connector 431, and the eighth board-to-board connector 452 can, for example, be consistent with the thickness directions of the second sub-board 33 and the second housing 22. The thickness direction of the sixth board-to-board connector 432 can, for example, be consistent with the thickness directions of the third sub-board 34 and the second housing 22.

[0109] Furthermore, such as Figure 6 As shown, the clamping assembly 8 includes a clamping plate 81. The clamping plate 81 includes a first locking part 812, a reinforcing part 811, and a second locking part 813 that are sequentially connected in the length direction X of the board-to-board connector. The first locking part 812 and the second locking part 813 are respectively fixedly connected to the PCB board 5 through corresponding locking structures, so that the reinforcing part 811 of the clamping plate 81 clamps the connecting part 62 of the FPC board 6 and the board-to-board connector 7 to the PCB board 5.

[0110] Alternatively, it can be understood that the first locking part 812 and the second locking part 813 are used to fix and connect with the PCB board 5, locking the clamping piece 81 onto the PCB board 5. The FPC board 6, the board-to-board connector 7, and the PCB board 5 are stacked along the thickness direction Z of the board-to-board connector. The clamping piece 81 of the clamping assembly 8 clamps and locks the FPC board 6 onto one side of the PCB board 5, and at the same time, clamps the board-to-board connector 7 located between the FPC board 6 and the PCB board 5.

[0111] In the thickness direction Z of the board-to-board connector, the reinforcing part 811 has a bottom surface 8111 facing the PCB board 5, and the connecting part 62 of the FPC board 6 has a top surface 621 facing away from the PCB board 5. The bottom surface 8111 of the reinforcing part 811 and the top surface 621 of the connecting part 62 are disposed opposite to each other and abut against each other.

[0112] The reinforcing part 811 is pressed onto the connecting part 62 of the FPC board 6. The bottom surface 8111 of the reinforcing part 811 is opposite to and abuts against the top surface 621 of the connecting part 62. This can be understood as the reinforcing part 811 directly abutting against the facing surfaces of the FPC board 6. On one hand, the reinforcing part 811 presses the connecting part 62 of the FPC board 6 and the board-to-board connector 7 against one side of the PCB board 5. On the other hand, the reinforcing part 811 on the clamping plate 81 replaces... Figure 5a The reinforcing steel sheet strengthens the structure of the connecting part 62, ensuring uniform stress distribution and even downward pressure. This guarantees the engagement strength of the male and female connectors 72 of the board-to-board connector 7, reliably and effectively preventing connector loosening or poor contact, and ensuring connection stability. Alternatively, the clamping plate 81 combines the clamping function with the reinforcement function of the traditional reinforcing steel sheet. While maintaining the connection strength of the board-to-board connector 7, the reinforcing steel sheet is eliminated, thus saving space and reducing weight.

[0113] Therefore, the circuit board assembly 200 provided in this application embodiment can not only ensure the connection strength of the board-to-board connector 7, but also save the thickness space of the whole machine and reduce the weight of the whole machine, which is conducive to the lightweight and miniaturization development of the terminal device 100.

[0114] It should be noted that the circuit board assembly 200 provided in this application embodiment can be any board-to-board connector described above, along with its corresponding FPC board 6, PCB board 5, and matching clamping assembly, forming the circuit board assembly 200. For example, it could be... Figure 4 The components include the first FPC board 41, the main board 31, the first board-to-board connector 411, and the clamping assembly that is matched with the first board-to-board connector 411. Figure 4 The circuit board assembly 200 (not shown) consists of a clamping component. This can also be understood as... Figure 4The clamping assembly corresponding to the first board-to-board connector 411 is configured as a combination of a clamping plate and a reinforcing steel plate, applying pressure directly to the first FPC board 41 and the first board-to-board connector 411 through the clamping plate. All board-to-board connector clamping assemblies in the terminal device 100 can adopt this form, or only some clamping assemblies can adopt this form; this application embodiment does not impose any limitations on this.

[0115] In one possible implementation, all board-to-board connector clamping assemblies in the terminal device 100 adopt this form. For example, if the terminal device 100 has 20 board-to-board connectors, and the corresponding clamping assembly for each connector is a combination of a clamping plate and a reinforcing steel plate, then the weight of 20 reinforcing steel plates is saved. If each reinforcing steel plate weighs 0.06g, the overall weight can be reduced by 1.2g. When the terminal device 100 is a non-folding device, the overall thickness can be reduced by 0.15mm to 0.2mm (the thickness of one reinforcing steel plate). If the terminal device 100 is... Figures 1 to 4 The double-fold terminal device 100 shown can reduce the thickness of each of its two parts by one reinforcing steel sheet, thus reducing the overall thickness of the device by 0.3mm to 0.4mm in the folded state. If the terminal device 100 is a multi-fold terminal device with three or more folds, the overall thickness can be reduced even further in the folded state.

[0116] It should be noted that when the terminal device 100 has multiple circuit board assemblies 200, the PCB boards 5 of the multiple circuit board assemblies 200 are set separately, or at least two circuit board assemblies 200 share a PCB board 5. For example, Figure 4 The PCB board 5 of the circuit board assembly 200 containing the first board-to-board connector 411 is the main board 31. The PCB board 5 of the circuit board assembly 200 containing the third board-to-board connector 421 is also the main board 31. The PCB board 5 of the circuit board assembly 200 containing the seventh board-to-board connector 442 is also the main board 31. The circuit board assemblies 200 containing the first board-to-board connector 411, the third board-to-board connector 421, and the seventh board-to-board connector 442 share the same PCB board 5. Only one second board-to-board connector 412 is provided on the first sub-board 32. The PCB board 5 of the circuit board assembly 200 containing the second board-to-board connector 412 is provided separately.

[0117] Please see Figures 7a to 7c , Figure 7a This is a top view of the clamping sheet in the circuit board assembly according to an embodiment of this application. Figure 1 ; Figure 7b This is a top view of the clamping sheet in the circuit board assembly according to an embodiment of this application. Figure 2 ; Figure 7c This is a top view of the clamping sheet in the circuit board assembly according to an embodiment of this application. Figure 3 .

[0118] like Figures 6 to 7b As shown, in one possible implementation, in a plane perpendicular to the thickness direction Z of the board-to-board connector, the bottom surface 8111 of the reinforcing portion 811 of the clamping plate 81 covers the top surface 621 of the connecting portion 62. The reinforcing portion 811 covers the entire top surface 621 of the connecting portion 62, allowing the pressure applied by the clamping plate 81 to be evenly transmitted to the top surface 621 of the connecting portion 62. Under the pressure of the clamping plate 81, the entire top surface 621 is recessed towards the PCB board 5, resulting in uniform force distribution throughout the board-to-board connector 7 and further strengthening the connection strength of the board-to-board connector 7.

[0119] In one possible implementation, the shape of the bottom surface 8111 of the reinforcing part 811 matches the shape of the top surface 621 of the connecting part 62. Shape matching means that the shapes are the same or similar, such as both being rectangular, circular, or elliptical. This structure effectively utilizes the area of ​​the bottom surface 8111 of the reinforcing part 811, and the reinforcing part 811 easily covers the top surface 621 of the connecting part 62. In some possible implementations, the shape of the bottom surface 8111 of the reinforcing part 811 and the top surface 621 of the connecting part 62 may not match; for example, one may be circular and the other rectangular, as long as the reinforcing part 811 can cover the top surface 621 of the connecting part 62.

[0120] like Figure 6 , Figure 7a As shown, in one possible implementation, the shape of the bottom surface 8111 of the reinforcing part 811 matches the shape of the top surface 621 of the connecting part 62, and the area of ​​the bottom surface 8111 of the reinforcing part 811 is larger than the area of ​​the top surface 621 of the connecting part 62. Alternatively, it can be understood that the projection of the top surface 621 of the connecting part 62 along the thickness direction Z of the board-to-board connector onto the PCB board 5 is located within the projection of the bottom surface 8111 of the reinforcing part 811 along the thickness direction Z of the board-to-board connector onto the PCB board 5, thus, the bottom surface 8111 of the reinforcing part 811 can cover the top surface 621 of the connecting part 62.

[0121] like Figure 6 , Figure 7bAs shown, in one possible implementation, the bottom surface 8111 of the reinforcing part 811 and the top surface 621 of the connecting part 62 have the same shape and size, and their edges are aligned. Alternatively, it can be understood that the projection of the top surface 621 of the connecting part 62 along the thickness direction Z of the board-to-board connector onto the PCB board 5 coincides with the projection of the bottom surface 8111 of the reinforcing part 811 along the thickness direction Z of the board-to-board connector onto the PCB board 5. Therefore, the bottom surface 8111 of the reinforcing part 811 can also cover the top surface 621 of the connecting part 62, and the volume of the reinforcing part 811 can be smaller, reducing the layout space occupied by the clamping assembly 8 on the PCB board 5 and reducing the weight of the clamping assembly 8.

[0122] like Figure 6 , Figure 7c As shown, in one possible implementation, the bottom surface 8111 of the reinforcing part 811 may not completely cover the top surface 621 of the connecting part 62. For example, the top surface 621 of the connecting part 62 may slightly extend beyond the edge of the bottom surface 8111 of the reinforcing part 811, as long as it ensures that the board-to-board connector 7 is subjected to uniform force and the connection strength meets the requirements. The shape and size of the reinforcing part 811 in the clamping plate 81 should be comprehensively considered based on the shape of the connecting part 62, the layout area on the PCB board 5, the required connection strength, cost, etc. This application embodiment does not impose any restrictions on this.

[0123] It should be noted that the specific shape of the clamping plate 81 and the connection method between the clamping plate 81 and the PCB board 5 are not limited in the embodiments of this application. Several possible methods are illustrated below with reference to the accompanying drawings.

[0124] Please see Figures 8 to 10 , Figure 8 This is an exploded view of the circuit board assembly according to an embodiment of this application; Figure 9 This is a top view of the circuit board assembly according to an embodiment of this application; Figure 10 This is a three-dimensional structural diagram of the circuit board assembly according to an embodiment of this application.

[0125] like Figures 8 to 10 As shown, in one possible implementation, the clamping assembly 8 further includes a first locking structure 91 and a second locking structure 92. The first locking structure 91 includes a plug-in portion 911 and a plugged portion 912. The plug-in portion 911 is disposed on the first locking portion 812, and the plugged portion 912 is fixedly disposed on the PCB board 5. The plugged portion 912 is provided with a slot 9120, and the plug-in portion 911 is at least partially inserted into the slot 9120, so that the first locking portion 812 is locked and fixed to the PCB board 5 by the first locking structure 91. Alternatively, it can be understood that the first locking portion 812 is fixed to the PCB board 5 by inserting the plug-in portion 911 on the first locking portion 812 into the slot 9120 of the plugged portion 912.

[0126] The second locking structure 92 includes a first connecting hole 921, a second connecting hole 922, and a fastener 923. The first connecting hole 921 is disposed in the second locking part 813, and the second connecting hole 922 is disposed in the PCB board 5. The fastener 923 passes through the first connecting hole 921 and is fixed in the second connecting hole 922, so that the second locking part 813 is locked and fixed to the PCB board 5 by the second locking structure 92. Alternatively, it can be understood that the second locking part 813 is fixed to the PCB board 5 by the cooperation of the fastener 923 and the connecting hole.

[0127] One locking part of the clamping plate 81 is fixed to the PCB board 5 by a plug-in connection, and the other locking part is fixed to the PCB board 5 by a fastener 923. This ensures connection strength and allows for more convenient and faster assembly. For example, as Figure 9 As shown, the insertion part 911 of the first locking part 812 can be inserted into the slot 9120 firstly to limit the movement of the clamping piece 81 in the thickness direction Z, width direction Y, and length direction X of the board-to-board connector. Then, the first connecting hole 921 and the second connecting hole 922 are aligned, and the fastener 923 is inserted into the connecting hole and tightened to fix it. This makes the operation more convenient.

[0128] It should be noted that in the accompanying drawings of this application, the first locking structure 91 is a plug-in locking structure (or can be understood as a snap-fit ​​locking structure), and the second locking structure 92 is a fastener locking structure, that is, a scheme of fastener locking on one side and snap-fit ​​locking on the other side. However, in practical applications, the locking and fixing scheme of the pressure plate 81 is not limited to this. For example, both the first locking structure 91 and the second locking structure 92 can be set as fastener locking structures, that is, a locking scheme of fasteners on both sides. Alternatively, both the first locking structure 91 and the second locking structure 92 can be set as plug-in locking structures or snap-fit ​​locking structures, that is, a locking scheme of plug-in (or snap-fit) on both sides. In addition, the first locking structure 91 and the second locking structure 92 can also adopt other locking forms, and this application embodiment does not limit them.

[0129] It should be noted that the specific structures of the insertion part 911 and the inserted part 912 in the first locking structure 91 are not limited. For example... Figures 8 to 10As shown, in one possible implementation, the first locking part 812 is configured as a sheet structure and integrally constitutes the insertion part 911 of the first locking structure 91. The mating part 912 includes a top plate 9121, a first side wall 9122, a second side wall 9123, and a third side wall 9124. The top plate 9121 and the PCB board 5 are spaced apart in the thickness direction Z of the board-to-board connector. The first side wall 9122 and the second side wall 9123 are respectively connected to the two sides of the top plate 9121 in the width direction Y of the board-to-board connector. The third side wall 9124 is connected to the side of the top plate 9121 away from the second locking structure 92 in the length direction X of the board-to-board connector. One end of each of the first side wall 9122, the second side wall 9123, and the third side wall 9124 in the thickness direction Z of the board-to-board connector is connected to the top plate 9121, and the other end is fixedly connected to the PCB board 5, so that the top plate 9121, the first side wall 9122, the second side wall 9123, and the third side wall 9124 surround to form a slot 9120.

[0130] With this structure, the first locking part 812 can be directly inserted into the slot 9120 without the need for an additional insertion part 911, making the shape and structure of the first locking part 812 simpler. The slot 9120 of the insertion part 912 is formed by a top plate 9121 and three side walls, which is simple in structure and easy to manufacture. For example, a "convex" shaped thin plate can be manufactured first, and then the thin plate can be directly bent into the insertion part 912. That is, the top plate 9121, the first side wall 9122, the second side wall 9123 and the third side wall 9124 can be formed by integral stamping of the thin plate, which is simple in process and can save materials.

[0131] The structure of the second locking part 813 is not limited. In one possible implementation, the second locking part 813 is configured as a sheet-like structure, and the first connecting hole 921 of the second locking structure 92 penetrates the second locking part 813 in the thickness direction Z of the board-to-board connector. The sheet-like structure is thinner, making it easier to drill holes and saving thickness space.

[0132] It should be noted that the method by which the fastener 923 locks and fixes the second locking part 813 and the PCB board 5 is not limited. In one possible implementation, the fastener 923 passes through the first connecting hole 921 of the second locking part 813 and is fixedly connected to the second connecting hole 922, and is threadedly connected to the second connecting hole 922. The head of the fastener 923 presses against the surface of the second locking part 813 on the side away from the board-to-board connector 7, thereby locking and fixing the second locking part 813 to the PCB board 5. Alternatively, the fastener 923 may also be threadedly connected to both the first connecting hole 921 and the second connecting hole 922. This embodiment of the application does not limit this.

[0133] like Figures 8 to 10As shown, in one possible implementation, in the thickness direction Z of the board-to-board connector, the first locking portion 812 and the second locking portion 813 of the clamping piece 81 are located on the side of the reinforcing portion 811 closer to the PCB board 5. Alternatively, it can be understood that the first locking portion 812 and the second locking portion 813 are recessed relative to the reinforcing portion 811 towards the side closer to the PCB board 5, thereby reserving space above the locking portion (on the side away from the PCB board 5) for the locking structure, preventing the locking structure from protruding from the surface of the reinforcing portion 811 away from the PCB board 5 and adding extra thickness. For example, the recess of the first locking portion 812 can prevent the top plate 9121 of the inserted portion 912 from protruding from the reinforcing portion 811, and the recess of the second locking portion 813 can prevent the fastener 923 from protruding from the reinforcing portion 811. In some possible implementations, the first locking portion 812 and the second locking portion 813 may not be recessed; this embodiment does not limit this.

[0134] like Figures 8 to 10 As shown, in one possible implementation, the first locking part 812 and the second locking part 813 are located at the two ends of the clamping plate 81 along the length direction X of the board-to-board connector, which can make the pressure applied by the reinforcing part 811 to the connecting part 62 of the FPC board 6 more uniform. In some possible implementations, the first locking part 812 and the second locking part 813 may not be located at the ends of the clamping plate 81, for example, they may be located between the ends of the clamping plate 81 and the reinforcing part 811. This application embodiment does not limit this.

[0135] It should be noted that the first locking part 812 and the second locking part 813 can be directly or indirectly fixedly connected to the PCB board 5. For example, the insertion part 912 of the first locking structure 91 can be directly disposed on the PCB board 5, and the first locking part 812 is directly fixedly connected to the PCB board 5. Alternatively, the insertion part 912 of the first locking structure 91 can also be disposed on the housing (e.g., on the middle frame of the housing). Since the PCB board 5 is fixed to the housing, the first locking part 812 is indirectly fixedly connected to the PCB board 5 by fixing the first locking part 812 to the housing. Similarly, the second connecting hole 922 of the second locking structure 92 can be disposed on the PCB board 5 or the housing, and this embodiment does not limit this.

[0136] like Figures 8 to 10 As shown, in one possible implementation, the clamping plate 81 is configured as a one-piece sheet structure. The one-piece structure has high strength and can prevent the clamping plate 81 from breaking or deforming due to fatigue. The sheet structure is thin and easy to process, for example, it can be integrally stamped.

[0137] It should be noted that the material of the clamping plate 81 is not limited. In one possible implementation, the clamping plate 81 is made of metal. Metal has high strength and can resist long-term stress. Furthermore, metal has good ductility, making it easy to process. For example, materials with high hardness such as copper, iron, and alloys can be used; no specific limitation is imposed. In some possible implementations, the clamping plate 81 can also be made of non-metallic materials such as plastic; this application embodiment does not impose any limitation on this.

[0138] It should be noted that the specific structure of the board-to-board connector 7 is not limited.

[0139] like Figure 6 , Figures 8 to 10 As shown, in one possible implementation, the board-to-board connector 7 includes a male connector 71 and a female connector 72. The male connector 71 and the female connector 72 are fixedly connected to the PCB board 5 and the FPC board 6, respectively, and then the two are fastened together to achieve electrical connection and signal interface between the PCB board 5 and the FPC board 6. In one possible implementation, the female connector 72 is fixed to the PCB board 5, and the male connector 71 is fixed to the FPC board 6. In another possible implementation, the female connector 72 can also be fixed to the FPC board 6, and the male connector 71 can be fixed to the PCB board 5; this embodiment does not limit this implementation.

[0140] like Figure 8 As shown, in one possible implementation, the male connector 71 includes a male base 711 and a plurality of male signal terminals 712. The male signal terminals 712 are fixed to the male base 711, and their specific number is not limited, depending on the specific circuit. The male signal terminals 712 may include, for example, a male signal plug-in portion 7121 and male signal pins (not shown in the figure). The male signal plug-in portion 7121 is used to connect to the female connector 72 in a plug-in manner, and the male signal pins are used to electrically connect to the FPC board 6. For example, multiple pads can be provided on the connection portion 62 of the FPC board 6, and the male signal pins of the male signal terminals 712 can be soldered to the corresponding pads.

[0141] In one possible implementation, the connector female socket 72 includes a female end base 721 and a plurality of female socket signal terminals 722. The female socket signal terminals 722 are fixed to the female end base 721, and the number of female socket signal terminals 722 can be set according to the number of male end signal terminals 712; this embodiment does not limit this. The female socket signal terminals 722 may include, for example, a female end signal contact portion 7221 and a female end signal pin (not shown in the figure). The female end signal contact portion 7221 is used for insertion and connection with the male end signal insertion portion 7121 of the male end signal terminal 712, and the female end signal pin is used for electrical connection with the PCB board 5. For example, multiple pads can be provided on the PCB board 5, and the female end signal pins of the female end signal terminals can be soldered to the corresponding pads.

[0142] It should be noted that the accompanying drawings in this application are for illustrative purposes only and do not limit the actual structure of the board-to-board connector 7.

[0143] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Therefore, if such modifications and variations fall within the scope of the claims of this application and their equivalents, this application also intends to include such modifications and variations.

Claims

1. A circuit board assembly (200), characterized by, Comprise: A PCB board (5); An FPC board (6) comprising a body part (61) and a connecting part (62) arranged in sequence, the connecting part (62) being fixedly connected with the PCB board (5); A board-to-board connector (7) having one side fixedly connected with the PCB board (5) and the other side fixedly connected with the connecting part (62) of the FPC board (6) in the thickness direction of the board-to-board connector; A compression assembly (8) comprising a compression sheet (81), the compression sheet (81) comprising a first locking part (812), a reinforcing part (811) and a second locking part (813) arranged in sequence in the length direction of the board-to-board connector, the first locking part (812) and the second locking part (813) being fixedly connected to the PCB board (5) through corresponding locking structures respectively, so that the reinforcing part (811) of the compression sheet (81) compresses the connecting part (62) of the FPC board (6) and the board-to-board connector (7) to the PCB board (5), wherein, in the thickness direction of the board-to-board connector, the reinforcing part (811) has a bottom surface (8111) facing the PCB board (5), the connecting part (62) of the FPC board (6) has a top surface (621) facing away from the PCB board (5), and the bottom surface (8111) of the reinforcing part (811) is arranged opposite to and abuts against the top surface (621) of the connecting part (62).

2. The circuit board assembly (200) of claim 1, wherein, In a plane perpendicular to the thickness direction of the board-to-board connector, the bottom surface (8111) of the reinforcing part (811) covers the top surface (621) of the connecting part (62).

3. The circuit board assembly (200) of claim 2, wherein, The shape of the bottom surface (8111) of the reinforcing part (811) matches the shape of the top surface (621) of the connecting part (62).

4. The circuit board assembly (200) of claim 1, wherein, The compression sheet (81) is provided in an integral sheet structure.

5. The circuit board assembly (200) of claim 1, wherein, The material of the compression sheet (81) is metal.

6. The circuit board assembly (200) according to any one of claims 1 to 5, characterized in that In the thickness direction of the board-to-board connector, the first locking part (812) and the second locking part (813) of the compression sheet (81) are located on the side of the reinforcing part (811) close to the PCB board (5).

7. The circuit board assembly (200) according to any one of claims 1 to 5, characterized in that The compression assembly (8) further comprises: A first locking structure (91) comprising a plug-in part (911) and a plugged-in part (912), the plug-in part (911) being arranged on the first locking part (812), the plugged-in part (912) being fixedly arranged on the PCB board (5), and the plugged-in part (912) being provided with a plug-in slot (9120), the plug-in part (911) being at least partially inserted into the plug-in slot (9120), so that the first locking part (812) is locked and fixed to the PCB board (5) through the first locking structure (91); A second locking structure (92) includes a first connecting hole (921), a second connecting hole (922), and a fastener (923). The first connecting hole (921) is arranged on the second locking portion (813). The second connecting hole (922) is arranged on the PCB board (5). The fastener (923) is fixed in the second connecting hole (922) through the first connecting hole (921), so that the second locking portion (813) is locked and fixed on the PCB board (5) through the second locking structure (92).

8. The circuit board assembly (200) of claim 7, wherein, The first locking portion (812) is arranged in a sheet structure and constitutes the insertion portion (911) of the first locking structure (91) as a whole. The inserted portion (912) includes a top plate (9121), a first side wall (9122), a second side wall (9123), and a third side wall (9124). The top plate (9121) is arranged in a spaced manner with the PCB board (5) in the thickness direction of the board-to-board connector. The first side wall (9122) and the second side wall (9123) are respectively connected to both sides of the top plate (9121) in the width direction of the board-to-board connector. The third side wall (9124) is connected to one side of the top plate (9121) away from the second locking structure (92) in the length direction of the board-to-board connector. One end of each side wall of the first side wall (9122), the second side wall (9123), and the third side wall (9124) in the thickness direction of the board-to-board connector is connected to the top plate (9121), and the other end is fixedly connected to the PCB board (5), so that the top plate (9121), the first side wall (9122), the second side wall (9123), and the third side wall (9124) surround the insertion slot (9120). The second locking portion (813) is arranged in a sheet structure. The first connecting hole (921) of the second locking structure (92) penetrates the second locking portion (813) in the thickness direction of the board-to-board connector.

9. A terminal device (100), characterized by The circuit board assembly (200) includes the circuit board assembly (200) of any one of claims 1-8.

10. The terminal device (100) according to claim 9, characterized by The circuit board assembly (200) is multiple. The PCB boards (5) of the multiple circuit board assemblies (200) are arranged separately, or the PCB boards (5) of at least two circuit board assemblies (200) are shared.

11. The terminal device (100) according to claim 9 or 10, characterized by The terminal device (100) is a foldable terminal device (100).

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