Flexible PCB secret key anti-disassembly structure

Abstract

The utility model relates to the technical field of flexible circuit boards, and discloses a flexible PCB secret key anti-disassembly structure, which comprises a flexible circuit board main body A. The top of the flexible circuit board main body A is provided with a flexible circuit board main body B close to the other side, and the top of the flexible circuit board main body B is provided with a plurality of limiting holes close to one side. A protection assembly is arranged at the top of the flexible circuit board body A, a connection assembly is arranged between the flexible circuit board body A and the flexible circuit board body B, and a metal layer is installed at the top of the flexible circuit board body A. Real-time monitoring is carried out through the central processing unit, if the flexible PCB is damaged, a secret key in the security chip body is self-destroyed, and if the secret key is self-destroyed, the security chip body is self-destroyed. After equipment is electrified, the security chip main body can be in a secret key state, even if the security chip main body is in a self-destroying state, the security chip main body can be uploaded to a far-end server through the wireless module, a plurality of semitransparent films are adopted and designed in a multi-layer stacking mode, an anti-dismantling wire layer is hidden, and compared with a traditional single-layer / double-layer flexible PCB, the security chip main body is more difficult to reversely crack.

Description

Technical Field

[0001] This utility model relates to the field of flexible circuit board technology, specifically a flexible PCB key anti-tampering structure. Background Technology

[0002] Flexible printed circuit boards (PCBs) are highly reliable and extremely flexible printed circuit boards made with polyimide or polyester film as the substrate. They are characterized by high wiring density, light weight, thinness, and good bending properties.

[0003] Flexible PCBs, due to their thinness and flexibility, are widely used in highly integrated applications such as wearable devices, medical devices, and smart cards. To protect core circuits and sensitive data, physical tamper-proof structures must be designed to prevent unauthorized disassembly, reverse engineering, or tampering.

[0004] Therefore, we propose a flexible PCB key anti-tampering structure to solve the problems mentioned above. Utility Model Content

[0005] The purpose of this invention is to provide a flexible PCB key anti-tamper structure to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a flexible PCB key anti-tamper structure, including a flexible circuit board body A, a flexible circuit board body B is provided on the top of the flexible circuit board body A near the other side, a plurality of limiting holes are opened on the top of the flexible circuit board body B near one side, a protective component is provided on the top of the flexible circuit board body A, a connecting component is provided between the flexible circuit board body A and the flexible circuit board body B, and a metal layer is installed on the top of the flexible circuit board body A.

[0007] The protective assembly includes a security chip body fixedly installed on the top of the flexible circuit board body A near one side, a central processing unit fixedly installed on the top of the flexible circuit board body A near one side, with the central processing unit located on the front side of the security chip body, a wireless module fixedly installed on the top of the flexible circuit board body A near one side, with the wireless module located on the rear side of the security chip body, and several semi-transparent films installed on the top of the metal layer, with an epoxy resin covering film fixedly installed on the top of the semi-transparent films.

[0008] Preferably, the connecting assembly includes a fixed plate fixedly installed on the top of the flexible circuit board body A near the other side and an L-shaped block fixedly installed on the front and rear sides of the fixed plate. The opposite sides of the L-shaped blocks are rotatably connected to a straight rod. A flip plate is fixedly sleeved on the outer periphery of the straight rod. A soft pad is fixedly installed on the bottom of the flip plate near the other side.

[0009] Preferably, the cushion is made of rubber.

[0010] Preferably, a number of fixing rods are fixedly installed on the top of the fixing plate. The fixing rods are arranged in a linear pattern from front to back, and the fixing rods respectively move through the inner cavity of the adjacent limiting holes.

[0011] Preferably, limit blocks are fixedly installed on the bottom of the flip plate near the front and rear sides, and fixing grooves are fixedly installed on the front and rear sides of the fixing plate. A slot is opened on the other side of the limit block near the bottom. A locking block is movably inserted into the inner cavity of the slot. A movable plate is fixedly installed on the other side of the locking block. A telescopic rod is fixedly installed on the other side of the movable plate near the front and rear sides. Two adjacent telescopic rods are fixedly connected to the other side of the inner cavity of the adjacent fixing groove. A spring is movably sleeved on the outer periphery of the telescopic rod. The two ends of the spring are fixedly connected to the other side of the inner cavity of the adjacent movable plate and the adjacent fixing groove, respectively.

[0012] Preferably, one side of the two limiting blocks and the top of the two slots are both arc-shaped.

[0013] Preferably, each of the movable plates has a connecting rod fixedly installed on the side away from each other, and the opposite end of the connecting rod movably penetrates the inner cavity sidewall of the adjacent fixed groove, and each is fixedly installed with a toggle block.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] 1. Real-time monitoring via the central processing unit: If the flexible PCB is damaged, the key inside the security chip will self-destruct. After the device is powered on, the security chip can be put into the key state. Even if it has self-destructed, it can still be uploaded to the remote server via the wireless module.

[0016] 2. It adopts a multi-layer stacked design with several semi-transparent films to hide the anti-tamper wire layer, making it more difficult to reverse engineer than traditional single-layer / double-layer flexible PCBs.

[0017] 3. When installing the flexible circuit board body B, with the cooperation of the connecting components, after the flip plate and soft pad are flipped to 90 degrees, the flexible circuit board body B can be limited. When the limiting block is in the inner cavity of the fixing groove, the card block can be moved and inserted into the inner cavity of the adjacent card slot, which can quickly install the flexible circuit board body B and avoid damage to the flexible circuit board body B. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall three-dimensional structure of this utility model;

[0019] Figure 2 This is an exploded view of the present invention;

[0020] Figure 3This is a partial exploded view from another perspective of the present invention;

[0021] Figure 4 This is a partial three-dimensional structural diagram of the fixing rod, flexible circuit board body A, and flexible circuit board body B of this utility model;

[0022] Figure 5 For the present utility model Figure 4 Enlarged view of point A in the middle.

[0023] In the diagram: 1. Flexible circuit board body A; 2. Flexible circuit board body B; 3. Security chip body; 4. Wireless module; 5. Metal layer; 6. Semi-transparent film; 7. Epoxy resin cover film; 8. Fixing plate; 9. L-shaped block; 10. Straight rod; 11. Flip plate; 12. Soft pad; 13. Fixing rod; 14. Limiting block; 15. Slot; 16. Locking block; 17. Movable plate; 18. Telescopic rod; 19. Spring; 20. Fixing groove; 21. Connecting rod; 22. Actuating block; 23. Central processing unit. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] Example 1

[0026] Please see Figure 1-5 A flexible PCB key tamper protection structure includes a flexible circuit board body A1, a flexible circuit board body B2 disposed on the top of the flexible circuit board body A1 near one side, a plurality of limiting holes being opened on the top of the flexible circuit board body B2 near one side, a protective component being disposed on the top of the flexible circuit board body A1, a connecting component being disposed between the flexible circuit board body A1 and the flexible circuit board body B2, and a metal layer 5 being installed on the top of the flexible circuit board body A1 (using HDI technology (25 / 25μm line width pitch) and laser micro-holes (50μm diameter), the tamper protection layer and the signal layer can coexist on the same substrate, saving space);

[0027] The protective components include a security chip body 3 fixedly installed on the top of the flexible circuit board body A1 near one side; a central processing unit 23 fixedly installed on the top of the flexible circuit board body A1 near one side, with the central processing unit 23 located in front of the security chip body 3; a wireless module 4 fixedly installed on the top of the flexible circuit board body A1 near one side, with the wireless module 4 located in front of the security chip body 3; and several semi-transparent films 6 installed on the top of the metal layer 5 (using several semi-transparent films 6 in a multi-layer stacked design to hide the anti-tamper wire layer, making it more difficult to reverse engineer than traditional single-layer / double-layer flexible PCBs). An epoxy resin cover film 7 is fixedly installed on the top of the semi-transparent films 6 (using epoxy resin cover film 7 and low-temperature curing adhesive, the stability is improved to 1000 hours in an 85℃ / 85%RH environment).

[0028] Specifically, through real-time monitoring by the central processing unit 23, if the flexible PCB is damaged, the key inside the security chip body 3 will self-destruct. After the device is powered on, the security chip body 3 can be put into the key state. Even if it has self-destructed, it can still be uploaded to the remote server through the wireless module 4.

[0029] Example 2

[0030] This embodiment is an improvement upon embodiment 1. For details, please refer to [link / reference]. Figure 3 , Figure 4 and Figure 5 The connecting components include a fixed plate 8 fixedly installed on the top of the flexible circuit board body A1 near the other side and an L-shaped block 9 fixedly installed on the front and rear sides of the fixed plate 8. The opposite sides of the L-shaped block 9 are rotatably connected to a straight rod 10. A flip plate 11 is fixedly sleeved on the outer periphery of the straight rod 10. A soft pad 12 is fixedly installed on the bottom of the flip plate 11 near the other side. The soft pad 12 is made of rubber.

[0031] Specifically, when installing the flexible circuit board body B2, with the cooperation of the connecting components, after the flip plate 11 and the soft pad 12 are flipped to 90 degrees, the flexible circuit board body B2 can be limited.

[0032] Several fixing rods 13 are fixedly installed on the top of the fixing plate 8. The fixing rods 13 are arranged in a linear pattern from front to back, and the fixing rods 13 move through the inner cavity of the adjacent limiting holes respectively.

[0033] Specifically, by setting several fixing rods 13, and by fitting several limiting holes on the flexible circuit board B2 around the fixing rods 13, the stability of the installation of the flexible circuit board B2 is improved.

[0034] Limiting blocks 14 are fixedly installed on the bottom of the flip plate 11 near the front and rear sides. Fixing grooves 20 are fixedly installed on the front and rear sides of the fixing plate 8. A slot 15 is opened on the other side of the limiting block 14 near the bottom. A locking block 16 is movably inserted into the inner cavity of the slot 15. One side of the two limiting blocks 14 and the top of the two slots 15 are arc-shaped. A movable plate 17 is fixedly installed on the other side of the locking block 16. A telescopic rod 18 is fixedly installed on the other side of the movable plate 17 near the front and rear sides. Two adjacent telescopic rods 18 are fixedly connected to the other side of the inner cavity of the adjacent fixing groove 20. A spring 19 is movably sleeved on the outer periphery of the telescopic rod 18. The two ends of the spring 19 are fixedly connected to the other side of the inner cavity of the adjacent movable plate 17 and the adjacent fixing groove 20, respectively.

[0035] Specifically, when the limiting block 14 is located in the inner cavity of the fixing groove 20, the card block 16 can be movably inserted into the inner cavity of the adjacent card groove 15, which can quickly install the flexible circuit board body B2 and also avoid damage to the flexible circuit board body B2.

[0036] Connecting rods 21 are fixedly installed on the opposite sides of the movable plate 17. The opposite ends of the connecting rods 21 respectively movably penetrate the inner cavity sidewalls of the adjacent fixed grooves 20, and each is fixedly installed with a toggle block 22.

[0037] Specifically, by setting the connecting rod 21 and the toggle block 22, the movable plate 17 can be moved to the other side by the toggle block 22, thereby allowing the card block 16 fixed on the movable plate 17 to move away from the inner cavity of the card slot 15, which facilitates the disassembly of the flexible circuit board body B2.

[0038] Working Principle: During use, this invention utilizes a central processing unit 23 for real-time monitoring. If the flexible PCB is damaged, the key inside the security chip body 3 self-destructs. After powering on, the security chip body 3 can be in a key state. Even in a self-destructed state, data can be uploaded to a remote server via the wireless module 4. When installing the flexible circuit board body B2, several limiting holes on the flexible circuit board body B2 are fitted onto the outer periphery of the adjacent fixing rod 13. Then, the flip plate 11 can be rotated 90 degrees, and the soft pad 12 fixed on the flip plate 11 is brought into contact with the flexible circuit board body B2, enabling rapid installation of the flexible circuit board. The installation of the flexible circuit board body B2 can also prevent damage to the flexible circuit board body B2. When the soft pad 12 is attached to the flexible circuit board body B2, the limiting block 14 can be located in the inner cavity of the fixing groove 20. When the limiting block 14 is in a vertical state, the locking block 16 can be inserted into the inner cavity of the adjacent locking groove 15. When it is necessary to release the limiting, the adjacent toggle block 22 can be pushed to the other side, which can cause the adjacent connecting rod 21 fixed on the toggle block 22 to connect and move the movable plate 17 to the other side, thereby allowing the locking block 16 to move away from the inner cavity of the adjacent locking groove 15, which facilitates the release of the limiting of the flexible circuit board body B2.

[0039] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0040] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A flexible PCB key anti-disassembly structure, comprising a flexible circuit board body A (1), characterized in that: The top of the flexible circuit board body A (1) is provided with a flexible circuit board body B (2) near the other side, a plurality of limiting holes are formed in the top of the flexible circuit board body B (2) near one side, a protection assembly is arranged on the top of the flexible circuit board body A (1), a connecting assembly is arranged between the flexible circuit board body A (1) and the flexible circuit board body B (2), and a metal layer (5) is installed on the top of the flexible circuit board body A (1); the protection assembly comprises a security chip body (3) fixedly installed on the top of the flexible circuit board body A (1) near one side, a central processing unit (23) fixedly installed on the top of the flexible circuit board body A (1) near one side, and the central processing unit (23) is located on the front side of the security chip body (3), a wireless module (4) fixedly installed on the top of the flexible circuit board body A (1) near one side, and the wireless module (4) is located on the rear side of the security chip body (3), a plurality of translucent films (6) are installed on the top of the metal layer (5), and epoxy resin covering films (7) are fixedly installed on the top of the translucent films (6).

2. The flexible PCB key tamperproof structure according to claim 1, wherein: The connecting assembly comprises a fixed plate (8) fixedly installed on the top of the flexible circuit board body A (1) near the other side and L-shaped blocks (9) fixedly installed on the front and rear sides of the fixed plate (8), opposite sides of the L-shaped blocks (9) are rotatably connected with straight rods (10), the outer periphery of the straight rods (10) is fixedly sleeved with turnover plates (11), and the bottom of the turnover plates (11) is fixedly installed with soft pads (12) near the other side.

3. The flexible PCB key tamperproof structure according to claim 2, wherein: The soft pad (12) is made of rubber material.

4. The flexible PCB key tamperproof structure according to claim 2, wherein: The top of the fixed plate (8) is fixedly installed with a plurality of fixed rods (13), the plurality of fixed rods (13) are linearly arranged from front to back in sequence, and the plurality of fixed rods (13) are respectively movably inserted into the inner cavities of adjacent limiting holes.

5. The flexible PCB key tamperproof structure of claim 2, wherein: The bottom of the turnover plate (11) is fixedly installed with limiting blocks (14) near the front and rear sides, the front and rear sides of the fixed plate (8) are fixedly installed with fixed grooves (20), the other side of the limiting block (14) is fixedly installed with clamping grooves (15) near the bottom, the inner cavities of the clamping grooves (15) are movably inserted with clamping blocks (16), the other side of the clamping block (16) is fixedly installed with movable plates (17), the other side of the movable plate (17) is fixedly installed with telescopic rods (18) near the front and rear sides, and the other side of the telescopic rod (18) is fixedly connected with the inner cavities of the adjacent fixed grooves (20), the outer periphery of the telescopic rod (18) is movably sleeved with springs (19), and the two ends of the spring (19) are fixedly connected with the inner cavities of the adjacent movable plates (17) and the adjacent fixed grooves (20) respectively.

6. The flexible PCB key tamperproof structure according to claim 5, wherein: One side of the two limiting blocks (14) and the top of the two clamping grooves (15) are arc-shaped.

7. The flexible PCB key tamperproof structure of claim 5, wherein: The side away from the movable plate (17) is fixedly installed with a connecting rod (21), and the opposite end of the connecting rod (21) is movably inserted through the inner cavity side wall of the adjacent fixed groove (20) and is fixedly installed with a pushing block (22).

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