Circuit board assembly, touch module and financial transaction device

Abstract

The application provides a circuit board assembly, a touch module and a financial transaction device. The circuit board assembly comprises a first flexible circuit board and a second flexible circuit board. The first flexible circuit board is provided with a first electric connector and a first protection circuit, and is used for electrically connecting with a first external electric connector. The second flexible circuit board is provided with a control chip, a second electric connector and a second protection circuit, is wound around the first flexible circuit board, and is used for electrically connecting with a second external electric connector. The control chip is located between the first flexible circuit board and the second flexible circuit board, and the second electric connector is plugged into the first electric connector. In this way, the control chip is wrapped between the first flexible circuit board and the second flexible circuit board, so that sensitive information such as transaction passwords and account data in the chip can be prevented from being obtained through physical disassembly or external detection.

Description

Technical Field

[0001] This application belongs to the field of financial trading equipment technology, and in particular relates to a circuit board assembly, a touch module, and a financial trading device. Background Technology

[0002] With the booming development of the digital economy, intelligent financial transaction devices such as ATMs, POS terminals, and self-service payment terminals have widely penetrated various fields such as commercial payments, banking services, and public utility payments, becoming a key carrier for the flow of funds in social and economic activities. During the use of these devices, cardholders need to enter core sensitive information such as account numbers, transaction passwords, and verification codes through the device screen to complete identity verification and transaction authorization. Therefore, the screen, as the component that directly bears the input and interaction of sensitive information, is clearly defined as a sensitive component.

[0003] The signal transmission links, which are closely related to the screen's functionality, are also a key area for protection due to the transmission of sensitive information. Specifically, the screen needs to connect to the control motherboard containing the processor inside the device via a flexible printed circuit board (FPC). The signal lines between the screen and the control motherboard, as well as the traces on the control motherboard connecting to the processor, are all considered sensitive signals. According to the security design specifications for financial equipment, the entire transmission link containing these sensitive signals must have reliable security protection capabilities to avoid the risk of sensitive information being stolen or tampered with during transmission, thus ensuring the safety of users' funds and information privacy.

[0004] However, in current mainstream touchscreen smart financial trading devices, screen-related FPCs include display FPCs that realize screen display and basic signal transmission, and touch FPCs responsible for touch signal acquisition and processing. Touch FPCs typically integrate touch ICs for touch signal processing. Due to limitations in the internal space layout and structural design of the device, these two types of FPCs are generally placed in the gap area between the touchscreen and the device housing. This area is narrow, compact, and often surrounded by other electronic components or metal structures, resulting in limited installation positions for both types of FPCs and the touch IC. The installation of protective structures is extremely difficult, easily interfering with surrounding components, leading to low assembly efficiency. Utility Model Content

[0005] The purpose of this application is to provide a circuit board assembly, a touch module, and a financial transaction device, aiming to solve the technical problem in the current related technologies that the display FPC and touch FPC are difficult to protect sensitive information due to installation space limitations.

[0006] The embodiments of this application are implemented as follows: Firstly, a circuit board assembly is provided, comprising: A first flexible circuit board is provided with a first electrical connector and a first protection circuit. The first flexible circuit board is used to be electrically connected to a first external electrical connector. The second flexible circuit board is provided with a control chip, a second electrical connector and a second protection circuit. The second flexible circuit board is wound around the first flexible circuit board and is used to electrically connect with a second external electrical connector. The control chip is located between the first flexible circuit board and the second flexible circuit board, and the second electrical connector is inserted into the first electrical connector.

[0007] In one embodiment of the first aspect, the first flexible circuit board is further provided with a third electrical connector, the second flexible circuit board includes a first winding portion and a second winding portion connected to each other, the control chip is disposed on the first winding portion, and a fourth electrical connector is disposed at the end of the second winding portion away from the first winding portion. The first flexible circuit board has a first mounting surface and a second mounting surface facing away from each other, the first mounting surface faces the control chip, the second winding portion is wound around one side of the second mounting surface, and the orthographic projection of the control chip on the first winding portion is located within the orthographic projection of the second winding portion on the first winding portion. The fourth electrical connector is inserted into the third electrical connector.

[0008] In one embodiment of the first aspect, the first flexible circuit board includes a first connecting portion and a second connecting portion connected together, the first electrical connector and the third electrical connector are both disposed on the first connecting portion, and a fifth electrical connector is disposed at the end of the second connecting portion away from the first connecting portion, the fifth electrical connector being used for electrical connection with a third external electrical connector.

[0009] In one embodiment of the first aspect, both the first electrical connector and the third electrical connector are disposed on the first mounting surface.

[0010] In one embodiment of the first aspect, the second flexible circuit board has a cover surface, and the control chip, the second electrical connector and the fourth electrical connector are all disposed on the cover surface, with the first mounting surface facing the cover surface.

[0011] In one embodiment of the first aspect, the first mounting surface has a protection area corresponding to the control chip, the first electrical connector and the third electrical connector are respectively located on different sides of the protection area, the second winding portion is disposed on the side of the first winding portion away from the third electrical connector, and the side of the first winding portion away from the second electrical connector is electrically connected to the second external electrical connector.

[0012] In one embodiment of the first aspect, the first flexible circuit board has a first conductive layer, a second conductive layer and a third conductive layer stacked sequentially, a first protective line is provided on the first conductive layer and the third conductive layer, and a sensitive information trace is provided on the second conductive layer.

[0013] In one embodiment of the first aspect, the second flexible circuit board has a fourth conductive layer and a fifth conductive layer stacked sequentially. The fourth conductive layer has a second protection line, and the fifth conductive layer has a sensitive information trace. The fifth conductive layer is located on the side of the fourth conductive layer closer to the first flexible circuit board.

[0014] In a second aspect, a touch module is provided, including a display layer, a touch layer, and a circuit board assembly as described in any of the above embodiments, wherein the display layer and the touch layer are stacked, wherein the display layer includes a first external electrical connector, and the touch layer includes a second external electrical connector.

[0015] Thirdly, a financial trading device is provided, including a control motherboard and a touch module as described in the above embodiment, wherein the second electrical connector is electrically connected to the control motherboard.

[0016] The technical advantages of this embodiment compared to the prior art are as follows: The circuit board assembly utilizes the second flexible circuit board to wrap around the first flexible circuit board, and the first and second electrical connectors are used for insertion and fixation. This allows the control chip to be encased between the first and second flexible circuit boards, physically isolating it from direct contact with external malicious probes or electromagnetic detection devices, preventing the acquisition of sensitive information such as transaction passwords and account data from physical disassembly or external detection. Furthermore, this circuit board assembly eliminates the need for additional clips, screws, or other fixing structures, quickly forming a stable overall structure between the first and second flexible circuit boards. This effectively limits their relative displacement, preventing loosening due to equipment vibration or assembly errors, while simplifying the assembly process and improving the assembly efficiency of internal components in financial trading equipment. Simultaneously, because the control chip is encased between the first and second flexible circuit boards, its sides are physically shielded by these boards, directly isolating it from external dust, liquids, and minor impacts. This eliminates the need for separate metal shielding structures, saving internal space and reducing the design and manufacturing costs of protective structures. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments of this application or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a three-dimensional structural diagram of the financial transaction device provided in the embodiments of this application; Figure 2 yes Figure 1 A partial exploded view of the financial trading equipment in the image; Figure 3 This is a three-dimensional structural diagram of the touch module provided in the embodiments of this application; Figure 4 This is an exploded view of the circuit board assembly provided in the embodiments of this application; Figure 5 This is a schematic diagram of the unfolded state of the second flexible circuit board in the circuit board assembly provided in the embodiments of this application; Figure 6 This is a three-dimensional structural diagram of the circuit board assembly provided in the embodiments of this application; Figure 7 This is a wiring diagram showing the connection between the circuit board assembly and the control motherboard signals provided in the embodiments of this application; Figure 8 This is a partial cross-sectional view of the circuit board assembly provided in the embodiments of this application.

[0019] Explanation of reference numerals in the attached figures: 100. Touch module; 20. Display layer; 30. Touch layer; 40. Cover plate; 10. Circuit board assembly; 101. First mounting surface; 102. Second mounting surface; 103. Cover surface; 11. First flexible circuit board; 111. First connecting part; 1111. Protective area; 112. Second connecting part; 110. Control chip; 11a. First electrical connector; 11b. Third electrical connector; 11c. Fifth electrical connector; 11d. First protective... 1101, First conductive layer; 1102, Second conductive layer; 1103, Third conductive layer; 12, Second flexible circuit board; 121, First winding portion; 122, Second winding portion; 12a, Second electrical connector; 12b, Fourth electrical connector; 12c, Second protective circuit; 1201, Fourth conductive layer; 1202, Fifth conductive layer; 13, First reinforcing sheet; 14, Second reinforcing sheet; 91, Main body of the equipment; 92, Control main board. Detailed Implementation

[0020] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application. In the description of this application, it should be understood that the terms "length", "width", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and 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 of 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 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 application, "multiple" means two or more, unless otherwise explicitly specified. In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "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 or an electrical 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 application according to the specific circumstances.

[0021] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments.

[0022] This application provides a financial transaction device, which includes, but is not limited to, POS machines, bank card automatic teller machines (ATMs), barcode payment acceptance terminals, and smart cash registers.

[0023] In this embodiment of the application, a POS machine is used as an example of a financial transaction device. Please refer to [link / reference]. Figure 1 and Figure 2 The financial trading device includes a main body 91, a touch module 100, and a control motherboard 92. The touch module 100 is mounted on the main body 91 and together with the main body 91 forms a receiving cavity. The control motherboard 92 is mounted in the receiving cavity and is electrically connected to the touch module 100.

[0024] Please see Figure 3This application embodiment also provides a touch module 100, which includes a display layer 20, a touch layer 30, and a circuit board assembly 10. The touch layer 30 is stacked on the light-emitting direction of the display layer 20. The circuit board assembly 10 is electrically connected to the display layer 20 and the touch layer 30, and is used to electrically connect to the control motherboard 92. Users can perform touch operations on the touch module 100. The display layer 20 is used to provide a visual window for transaction information, and the touch layer 30 is used to collect operation commands. The circuit board assembly 10 is used to transmit display signals and touch signals from the display layer 20 to the control motherboard 92, and to receive display data (such as transaction amount numbers and payment method icons) such as transaction information and operation instructions sent by the control motherboard 92, and convert the data into driving signals that the display layer 20 can recognize, controlling the screen to light up the corresponding content. A cover plate 40 may also be provided on the side of the touch layer 30 away from the display layer 20 to protect the touch layer 30 and the display layer 20.

[0025] Please see Figure 3 This application also provides a circuit board assembly 10, which includes a first flexible circuit board 11 and a second flexible circuit board 12. The first flexible circuit board 11 is electrically connected to a first external electrical connector, and the second flexible circuit board 12 is electrically connected to a second external electrical connector. In this application embodiment, the display layer 20 may include the first external electrical connector, and the touch layer 30 may include the second external electrical connector. That is, the first flexible circuit board 11 is electrically connected to the display layer 20, and the second flexible circuit board 12 is electrically connected to the touch layer 30. The first flexible circuit board 11 can also be communicatively connected to the control motherboard. This communication connection method includes, but is not limited to, electrical connection through connectors, electrical connection through soldering, and electrical connection through contact, etc., which are not limited here. The second flexible circuit board 12 is provided with touch signal traces electrically connected to the touch layer 30. The second flexible circuit board 12 is used to receive touch command electrical signals from the touch layer 30 and stably transmit the signals to the first flexible circuit board 11 through its own circuitry. The first flexible circuit board 11 is provided with display signal traces that are electrically connected to the display layer 20. The first flexible circuit board 11 is used to transmit display signal traces to the control motherboard 92 (e.g., ...). Figure 2 It transmits display signals and touch signals to the display layer 20, and receives display data (such as transaction amount numbers and payment method icons) such as transaction information and operation instructions sent by the control motherboard 92, and converts the data into drive signals that the display layer 20 can recognize, and controls the screen to light up the corresponding content.

[0026] In other embodiments, the first external electrical connector and the second external electrical connector may also be a card swiping module and a barcode scanning module, or a printing module and a status indicator module, or a power management module and a security encryption module, or a button module and a buzzer module in a financial transaction device. The circuit board assembly 10 can also be applied to non-financial transaction devices, in which case the first external electrical connector and the second external electrical connector may be an NFC module and a USB interface module, etc., respectively; no limitation is made here.

[0027] In the embodiments of this application, please refer to Figure 4 and Figure 5 The first flexible circuit board 11 is provided with a first electrical connector 11a and a first protection circuit. The first electrical connector 11a is electrically connected to the first protection circuit and the display information wiring. The second flexible circuit board 12 is provided with a control chip 110, a second electrical connector 12a, and a second protection circuit. The second electrical connector 12a is electrically connected to the control chip 110, the touch information wiring, and the second protection circuit. In this embodiment, the control chip 110 can be selected as a touch chip.

[0028] Please combine Figure 6 The second flexible circuit board 12 is wound around the first flexible circuit board 11. The second flexible circuit board 12 may be wound around the first flexible circuit board 11 for a full turn or less. That is, after the second flexible circuit board 12 is wound around the first flexible circuit board 11, the two ends of the second flexible circuit board 12 in the winding direction may be connected or spaced apart. These two ends may be located on the same side or different sides of the first flexible circuit board 11, without any restriction. At the same time, after the second flexible circuit board 12 is wound around the first flexible circuit board 11, the control chip 110 (such as...) Figure 5 Located between the first flexible circuit board 11 and the second flexible circuit board 12, that is, with the side of the second flexible circuit board 12 on which the control chip 110 is disposed as the covering surface 103, the second flexible circuit board 12 is wrapped around the first flexible circuit board 11 with the covering surface 103 facing the first flexible circuit board 11.

[0029] The second electrical connector 12a can be plugged into the first electrical connector 11a to achieve electrical connection between the two. After the second electrical connector 12a is plugged into the first electrical connector 11a, since the first flexible circuit board 11 is connected to the display layer 20 and the second flexible circuit board 12 is connected to the touch layer 30, the relative positions of the second flexible circuit board 12 and the first flexible circuit board 11 are fixed, and the circuit board assembly 10 forms an integral structure. In this integral structure, the two sides of the control chip 110 are physically shielded by the first flexible circuit board 11 and the second flexible circuit board 12, respectively.

[0030] Both the first and second protection circuits can be connected to the anti-tamper circuit / loop on the control motherboard 92 via the connection of the first flexible circuit board 11 and the control motherboard 92, thereby connecting the anti-tamper circuit and forming a closed circuit. Under normal operating conditions of the financial trading equipment, the security chip in the anti-tamper circuit detects that the input pin level is a normal preset value (e.g., low level 0V), determines that the equipment is safe, does not trigger the security mechanism, and the equipment operates normally. When the first flexible circuit board 11 or the second flexible circuit board 12 is subjected to a physical puncture attack, the corresponding onboard protection circuit will break along with the damaged flexible circuit board, causing the anti-tamper circuit connected by the first and second protection circuits to disconnect. At this time, the security chip in the control motherboard 92 detects an abnormal change in the anti-tamper circuit level (e.g., from a normal low level to a high level) through a preset sensor (e.g., an input port configured with a fixed level), determines that the equipment is under attack, and then triggers the preset security mechanism. Once the security mechanism is activated, the security chip sends instructions to each control unit of the device to execute multi-dimensional protection actions, including but not limited to: sending an erase command to the storage module to immediately erase all security-related sensitive data stored in the device, such as bank card account information and transaction passwords, to prevent data theft and lock the device's functions and data; sending a disconnect command to the communication module to cut off the device's connection with the external network, blocking the path for criminals to steal remaining data through network transmission; and sending an alert signal to the display module to display an abnormal status prompt on the device screen in real time, promptly informing the user of the current risk and preventing the user from continuing to operate or having their information leaked.

[0031] In this way, the circuit board assembly 10, by wrapping the first flexible circuit board 11 with the second flexible circuit board 12 and fixing it with the insertion of the first electrical connector 11a and the second electrical connector 12a, physically isolates the control chip 110 from direct contact by external malicious probes and electromagnetic detection devices, preventing the acquisition of sensitive information such as transaction passwords and account data inside the chip through physical disassembly or external detection. In addition, the circuit board assembly 10 does not require additional fasteners, screws, or other fixing structures to quickly form a stable integral structure between the first flexible circuit board 11 and the second flexible circuit board 12, effectively limiting their relative displacement and preventing loosening of the connection due to equipment vibration or assembly errors. At the same time, it simplifies the assembly process and improves the assembly efficiency of internal components of financial trading equipment. Meanwhile, since the control chip 110 is wrapped between the first flexible circuit board 11 and the second flexible circuit board 12, the two sides of the control chip 110 are physically shielded by the first flexible circuit board 11 and the second flexible circuit board 12, which can directly isolate the control chip 110 from external dust, liquid and slight collisions. Moreover, there is no need to design a separate metal shield or other protective structure, which saves internal space of the equipment and reduces the design and manufacturing cost of the protective structure.

[0032] Optionally, the first and second protection circuits can further enhance the electromagnetic shielding effect, effectively absorb or cancel electromagnetic interference generated by other components inside the equipment (such as power modules and printing modules), and at the same time block the electromagnetic signals radiated outward by the control chip 110 during data transmission, preventing third parties from stealing sensitive information through electromagnetic signal interception technology.

[0033] Optional, please refer to Figure 4 The area on the first flexible circuit board 11 corresponding to the control chip 110 can be named the protection area 1111, and the area on the second flexible circuit board 12 where the control chip 110 is installed can be named the coverage area. The first protection line is at least set in the protection area 1111, or is set in the protection area 1111 with high density, and the second protection line is at least set in the coverage area, or is set in the coverage area with high density.

[0034] In some embodiments, please refer to Figure 4 and Figure 5 The first flexible circuit board 11 is also provided with a third electrical connector 11b. The second flexible circuit board 12 includes a first winding portion 121 and a second winding portion 122 connected to each other. The first winding portion 121 is electrically connected to the touch screen. The control chip 110 is disposed on the first winding portion 121. The first winding portion 121 has the aforementioned coverage area. A fourth electrical connector 12b is provided at the end of the second winding portion 122 away from the first winding portion 121. The second winding portion 122 is wound around the first flexible circuit board 11. The first flexible circuit board 11 has a first mounting surface 101 and a second mounting surface 102 facing each other. The first mounting surface 101 faces the control chip 110, that is, the mounting surface and the covering surface 103 face each other and together clamp the control chip 110. The second mounting surface 102 faces away from the control chip 110. The second winding portion 122 can be wound around the second mounting surface 102. The orthographic projection of the control chip 110 on the first winding portion 121 is located within the orthographic projection of the second winding portion 122 on the first winding portion 121. That is to say, the first winding portion 121 and the second winding portion 122 respectively shield the first flexible circuit board 11 on both sides of the protection area 1111. The fourth electrical connector 12b is inserted into the third electrical connector 11b, so that the end of the second winding portion 122 away from the first winding portion 121 is stably supported. At the same time, the protective area 1111 of the first flexible circuit board 11 is stably shielded on both sides by the first winding portion 121 and the second winding portion 122, respectively. Together with the first protection circuit and the second protection circuit, it can further isolate the external physical contact between the sensitive circuits of the first flexible circuit board 11 and the control chip 110. At the same time, the insertion of the fourth electrical connector 12b and the third electrical connector 11b further strengthens the connection strength of the two flexible circuit boards, preventing the second winding portion 122 from shifting due to equipment vibration.

[0035] In some embodiments, please refer to Figure 4 and Figure 5 The first flexible circuit board 11 includes a first connecting portion 111 and a second connecting portion 112 connected together. A first electrical connector 11a and a third electrical connector 11b are both disposed on the first connecting portion 111. The first connecting portion 111 is electrically connected to the display screen. A fifth electrical connector 11c is disposed at the end of the second connecting portion 112 away from the first connecting portion 111. The fifth electrical connector 11c is used to electrically connect with a third external electrical connector. In this embodiment, the third external electrical connector can be a control motherboard 92, that is, the fifth electrical connector 11c can be used to electrically connect with the control motherboard 92 in this embodiment. In other embodiments, the fifth electrical connector 11c can also be used to electrically connect with other electrical connectors to realize the electrical connection between the first external electrical connector and the other electrical connector. The first connecting portion 111 centrally provides the first electrical connector 11a and the third electrical connector 11b, which can centrally integrate the core connection node and the protection area of ​​the control chip 110, and facilitate centralized protection through the first winding portion 121 and the second winding portion 122 of the second flexible circuit board 12, avoiding protection loopholes caused by the dispersion of sensitive connection nodes. In addition, the second connection part 112 is specifically connected to the third external electrical connector through the fifth electrical connector 11c. This clearly defines the functional boundaries between the first connection part 111 and the second connection part 112, allowing the first connection part 111 to focus on protecting the control chip 110 and key connections. At the same time, the flexible characteristics of the second connection part 112 can flexibly adapt to the installation position of the control motherboard 92 in the cavity, solving the connection problem caused by the large distance between the control motherboard 92 and the first connection part 111 or the limited installation angle.

[0036] The second connecting part 112 extends in a strip-shaped, curved path to precisely fit the layout gaps of components such as the control motherboard 92 and power module within the housing of the financial trading equipment. This easily bypasses spatial obstacles, ensuring stable connection between the second connecting part 112 and the control motherboard 92 even in narrow or irregular installation areas. This solves the problem of traditional straight-path installations being impossible due to space limitations. Furthermore, the reserved redundant length buffers physical effects such as vibration and thermal expansion and contraction during equipment operation, preventing wire breakage or loosening of electrical connections due to pulling or deformation of the second connecting part 112. It also provides operational leeway for subsequent equipment maintenance (such as disassembling and fine-tuning the position of the control motherboard 92), allowing adjustment of the second connecting part 112's position without disassembling the entire circuit board assembly 10. This reduces maintenance difficulty and cost, further ensuring the long-term stability and maintainability of the financial trading equipment.

[0037] Optional, please refer to Figure 7Four first protection lines 11d are provided. Two of the first protection lines 11d are connected to the first electrical connector 11a and the fifth electrical connector 11c at their respective ends, and the other first protection line 11d is connected to the third electrical connector 11b and the fifth electrical connector 11c at its respective ends. Two second protection lines 12c are provided. The two second protection lines 12c are connected to the second electrical connector 12a and the fourth electrical connector 12b at their respective ends. After the first electrical connector 11a and the second electrical connector 12a are connected, the third electrical connector 11b and the fourth electrical connector 12b are connected, and the fifth electrical connector 11c is connected to the control motherboard 92, two paths are formed that are connected to the anti-tampering circuit on the control motherboard 92. Each path can be used to transmit input signals and output signals. The independent transmission of input signals and output signals can avoid signal interference or crosstalk problems that may occur when a single path carries bidirectional signals at the same time, ensuring that the anti-tampering circuit detects level changes more accurately and reducing false triggering or missed triggering caused by signal confusion.

[0038] Optional, such as Figure 4 As shown, both the first electrical connector 11a and the third electrical connector 11b are disposed on the first mounting surface 101. Since the first winding portion 121 and the second winding portion 122 are both inserted on one side of the first mounting surface 101, the second flexible circuit board 12 can be guided to naturally wrap around the first flexible circuit board 11, forming a complete or near-complete wrap, starting from the first mounting surface 101. Simultaneously, the second flexible circuit board 12 extends across the second mounting surface 102, forming a near-closed 360° wrap around the first flexible circuit board 11. This ensures that the first mounting surface 101, the second mounting surface 102, and the edge areas of the first flexible circuit board 11 are all covered by the second flexible circuit board 12, completely eliminating blind spots. Furthermore, this same-side insertion method makes the wrapping path of the second flexible circuit board 12 more regular, avoiding winding offset caused by scattered insertion positions, and ensuring that the control chip 110 of the first winding portion 121 is always protected by the two flexible circuit boards.

[0039] Correspondingly, combined Figure 5The control chip 110, the second electrical connector 12a, and the fourth electrical connector 12b are all disposed on the covering surface 103. When the second electrical connector 12a mates with the first electrical connector 11a, and when the fourth electrical connector 12b mates with the third electrical connector 11b, they can all be inserted into the first flexible circuit board 11 in the same direction. There is no need to adjust the angle of the second flexible circuit board 12 or perform any flipping operations. Assembly personnel only need to apply force in a fixed direction to complete the precise connection of the two connectors, significantly reducing assembly difficulty and shortening assembly time, making it particularly suitable for large-scale production scenarios of financial equipment. Furthermore, the unidirectional insertion ensures that the force direction of the two connection points is consistent, avoiding deformation caused by uneven local force on the second flexible circuit board 12 due to different insertion directions. This ensures that the control chip 110 is always stably clamped between the two flexible circuit boards, while reducing contact problems caused by connector misalignment due to force, ensuring the stability of sensitive signal transmission, and balancing assembly convenience with structural reliability, further meeting the production and usage requirements of financial trading equipment.

[0040] In some embodiments, please refer to Figure 4 The first electrical connector 11a and the third electrical connector 11b are located on different sides of the protected area 1111, and the second winding portion 122 is located on the side of the first winding portion 121 away from the third connector. The insertion of the first electrical connector 11a and the second electrical connector 12a directly blocks the liftable space of the first winding portion 121 near the first electrical connector 11a. The mating of the third electrical connector 11b and the fourth electrical connector 12b simultaneously blocks the gap of the first winding portion 121 near the third electrical connector 11b, thereby reducing or eliminating the exposed liftable position between the first connecting portion 111 and the first winding portion 121. Structurally, this prevents attackers from inserting probes to contact sensitive components such as the control chip 110 by prying open the gap. In addition, the connection positions of the second winding part 122 and the first winding part 121, and the connection positions of the first winding part 121 and the display layer 20, all avoid the first connector and the third connector. This ensures that the second flexible circuit board 12 provides uninterrupted protection for the first flexible circuit board 11, avoids mutual interference between the connection nodes, and keeps the control chip 110 fully enclosed at all times. Together with the protection circuit, this forms a comprehensive physical protection without blind spots, meeting the stringent security requirements of financial trading equipment for preventing disassembly and detection of sensitive components.

[0041] The control chip 110 is square, therefore the protection area 1111 is also square. The first electrical connector 11a and the third electrical connector 11b are located on one side of the two right-angled sides of the square protection area 1111, respectively. The length direction of the first electrical connector 11a is the same as the length direction of the corresponding right-angled side, and the length direction of the third electrical connector 11b is the same as the length direction of the corresponding right-angled side, so as to increase the shielding area of ​​the gap between the first winding part 121 and the first connecting part 111. Optionally, the length direction of the first electrical connector 11a is perpendicular to the length direction of the third electrical connector 11b.

[0042] In some embodiments, please refer to Figure 3 and Figure 4 The circuit board assembly 10 also includes a first reinforcing piece 13, which is disposed on the side of the first connecting part 111 facing away from the first winding part 121 to enhance the support rigidity of the first connecting part 111, prevent the first connecting part 111 from deforming or wrinkling due to frequent insertion and removal or external pressure, ensure the electrical connection stability between the first connecting part 111 and the first winding part 121, and prevent the interruption of sensitive signal transmission due to loose connection.

[0043] In some embodiments, please refer to Figure 6 The circuit board assembly 10 also includes a second reinforcing piece 14, which is disposed on the side of the first winding portion 121 opposite to the first connecting portion 111 to enhance the support rigidity of the first winding portion 121, prevent the first winding portion 121 from deforming or wrinkling due to frequent insertion and removal or external pressure, ensure the electrical connection stability between the first connecting portion 111 and the first winding portion 121, and prevent the interruption of sensitive signal transmission due to loose connection.

[0044] It should be noted that the first reinforcing sheet 13 and the second reinforcing sheet 14 mentioned above are both rigid sheets, such as metal sheets, rigid plastic sheets, etc.

[0045] The projections of the control chip 110 on the first reinforcing plate 13, the first electrical connector 11a on the first reinforcing plate 13, and the third electrical connector 11b on the first reinforcing plate 13 are all located on the first reinforcing plate 13. The projections of the control chip 110 on the second reinforcing plate 14 and the second electrical connector 12a on the second reinforcing plate 14 are also located on the second reinforcing plate 14. In this way, the insertion between the first electrical connector 11a and the second electrical connector 12a can be achieved by applying clamping force between the first reinforcing plate 13 and the second reinforcing plate 14. At the same time, the control chip 110 is located between the first reinforcing plate 13 and the second reinforcing plate 14, thereby improving the physical protection strength.

[0046] In some embodiments, please refer to Figure 8The first flexible circuit board 11 has a first conductive layer 1101, a second conductive layer 1102, and a third conductive layer 1103 stacked sequentially. First protective circuits are provided on the first conductive layer 1101 and the third conductive layer 1103, and sensitive information traces are provided on the second conductive layer 1102. Thus, the first conductive layer 1101 and the third conductive layer 1103, located on opposite sides, form a protective layer surrounding the second conductive layer 1102 through the first protective circuit. This directly and physically isolates the sensitive information traces from external contact attacks. When an attacker attempts to steal sensitive information by drilling, the drilling action must penetrate either the first conductive layer 1101 or the third conductive layer 1103. This process first cuts off the outer first protective circuit, triggering the anti-tampering mechanism of the security chip, thereby comprehensively blocking the risk of sensitive information leakage caused by physical means such as drilling. Simultaneously, the electromagnetic shielding effect of the double-layered first protective circuit can significantly reduce the impact of internal electromagnetic interference on sensitive signals, preventing signal interference or leakage. In addition, the sensitive information traces are set separately in the middle second conductive layer 1102, which is completely isolated from the first protection lines of the upper and lower layers. This not only reduces signal crosstalk caused by trace crossing, but also simplifies the line layout through layered design, reduces the risk of short circuit caused by dense lines, and takes into account both signal transmission stability and line security, fully meeting the high security standards of financial trading equipment for sensitive information transmission links.

[0047] In some embodiments, the second flexible circuit board 12 has a fourth conductive layer 1201 and a fifth conductive layer 1202 stacked sequentially. The fourth conductive layer 1201 is provided with a second protective circuit, and the fifth conductive layer 1202 is provided with sensitive information traces. The fifth conductive layer 1202 is located on the side of the fourth conductive layer 1201 closest to the first flexible circuit board 11. In this way, the outer fourth conductive layer 1201 forms a physical isolation through the second protective circuit to prevent dust, liquids, and minor impacts from eroding the inner sensitive information traces, avoiding damage to the traces caused by non-malicious factors. At the same time, in terms of security defense, if a malicious physical attack such as drilling or cutting occurs, the attacker must first destroy the second protective circuit of the fourth conductive layer 1201 before accessing the fifth conductive layer 1202. The breakage of the protective circuit will immediately trigger the anti-tampering mechanism of the security chip (such as erasing sensitive data and locking the device), blocking information theft from the source of the attack and comprehensively protecting the security of sensitive information during storage and transmission.

[0048] The above are merely preferred embodiments of this application, and only specifically describe the technical principles of this application. These descriptions are only for explaining the principles of this application and should not be construed as limiting the scope of protection of this application in any way. Based on this explanation, any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application, as well as other specific embodiments of this application that can be conceived by those skilled in the art without creative effort, should be included within the scope of protection of this application.

Claims

1. A circuit board assembly, characterized in that, include: A first flexible circuit board is provided with a first electrical connector and a first protection circuit. The first flexible circuit board is used to be electrically connected to a first external electrical connector. The second flexible circuit board is provided with a control chip, a second electrical connector and a second protection circuit. The second flexible circuit board is wound around the first flexible circuit board and is used to electrically connect with a second external electrical connector. The control chip is located between the first flexible circuit board and the second flexible circuit board, and the second electrical connector is inserted into the first electrical connector.

2. The circuit board assembly as claimed in claim 1, characterized in that, The first flexible circuit board is further provided with a third electrical connector. The second flexible circuit board includes a first winding portion and a second winding portion that are connected to each other. The control chip is disposed on the first winding portion. A fourth electrical connector is disposed on the end of the second winding portion away from the first winding portion. The first flexible circuit board has a first mounting surface and a second mounting surface that are opposite to each other. The first mounting surface faces the control chip. The second winding portion is wound around one side of the second mounting surface. The orthographic projection of the control chip on the first winding portion is located within the orthographic projection of the second winding portion on the first winding portion. The fourth electrical connector is inserted into the third electrical connector.

3. The circuit board assembly as described in claim 2, characterized in that, The first flexible circuit board includes a first connecting portion and a second connecting portion connected together. The first electrical connector and the third electrical connector are both disposed on the first connecting portion. A fifth electrical connector is disposed at the end of the second connecting portion away from the first connecting portion. The fifth electrical connector is used to electrically connect with a third external electrical connector.

4. The circuit board assembly as claimed in claim 3, characterized in that, The circuit board assembly further includes a first reinforcing sheet and a second reinforcing sheet. The first reinforcing sheet is disposed on the side of the first connecting portion opposite to the first winding portion, and the second reinforcing sheet is disposed on the side of the first winding portion opposite to the first connecting portion.

5. The circuit board assembly as described in claim 2, characterized in that, The first electrical connector and the third electrical connector are both disposed on the first mounting surface. The second flexible circuit board has a covering surface. The control chip, the second electrical connector, and the fourth electrical connector are all disposed on the covering surface. The first mounting surface faces the covering surface.

6. The circuit board assembly as claimed in claim 2, characterized in that, The first mounting surface has a protection area corresponding to the control chip. The first electrical connector and the third electrical connector are located on different sides of the protection area. The second winding portion is disposed on the side of the first winding portion away from the third electrical connector. The side of the first winding portion away from the second electrical connector is electrically connected to the second external electrical connector.

7. The circuit board assembly as claimed in claim 1, characterized in that, The first flexible circuit board has a first conductive layer, a second conductive layer and a third conductive layer stacked in sequence. The first conductive layer and the third conductive layer are provided with a first protection line, and the second conductive layer is provided with a sensitive information trace.

8. The circuit board assembly as claimed in claim 1, characterized in that, The second flexible circuit board has a fourth conductive layer and a fifth conductive layer stacked in sequence. The fourth conductive layer has a second protection line, and the fifth conductive layer has a sensitive information trace. The fifth conductive layer is located on the side of the fourth conductive layer closest to the first flexible circuit board.

9. A touch module, characterized in that, The device includes a display layer, a touch layer, and a circuit board assembly as described in any one of claims 1 to 8, wherein the display layer and the touch layer are stacked together, and the display layer includes the first external electrical connector and the touch layer includes the second external electrical connector.

10. A financial trading device, characterized in that, It includes a control motherboard and a touch module as described in claim 9, wherein the second electrical connector is electrically connected to the control motherboard.

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