Anti-disassembly structure and terminal equipment

Abstract

The utility model discloses an anti-disassembly structure and a terminal device. The anti-disassembly structure comprises a mainboard, an encryption module, a flexible circuit board, a first conductive member and a first detection pin, and the first conductive member is located between the flexible circuit board and the first detection pin; when the terminal equipment is in an assembled state, the flexible circuit board is electrically connected with the first detection pin through the first conductive part, and when the terminal equipment is in a disassembled state, the first conductive part and the flexible circuit board and / or the first detection pin form a gap; the anti-disassembly structure further comprises a shielding cover, the flexible circuit board comprises connecting parts connected with the shielding cover, and each connecting part comprises a first line layer with impedance. According to the anti-disassembly structure provided by the embodiment of the invention, anti-disassembly detection is realized in two different modes of determining whether the electric connection between the flexible circuit board and the encryption module is disconnected or not and whether the impedance value of the flexible circuit board is changed or not, and dual different types of anti-disassembly protection are provided, namely, anti-disassembly double insurance is provided, so that the anti-disassembly level is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of anti-disassembly, in particular to an anti-disassembly structure and a terminal device. Background Art

[0002] At present, users attach great importance to data security. In order to prevent data from being stolen or leaked, it is necessary to encrypt the data according to a key.

[0003] In the existing products, anti-disassembly points are provided on the circuit board and cooperate with corresponding structures, so that when the product is illegally disassembled, corresponding feedback signals will be generated to activate the protection mechanism to prevent the key from being stolen or leaked. However, the anti-disassembly level of the existing anti-disassembly structures is relatively low. Summary of the Utility Model

[0004] The utility model provides an anti-disassembly structure and a terminal device, aiming to at least solve the problem that the anti-disassembly level of the existing anti-disassembly structure is relatively low.

[0005] In a first aspect, an embodiment of the utility model provides an anti-disassembly structure applied to a terminal device. The anti-disassembly structure includes a main board, an encryption module provided on the main board, a flexible circuit board, a first conductive member, and a first detection pin provided on the main board and electrically connected to the encryption module. The first conductive member is located between the flexible circuit board and the first detection pin.

[0006] When the terminal device is in an assembled state, the flexible circuit board and the first conductive member are pressed tightly, the flexible circuit board and the first detection pin are in close contact with the first conductive member, and the flexible circuit board is electrically connected to the first detection pin through the first conductive member. When the terminal device is in a disassembled state, the first conductive member forms a gap with the flexible circuit board and / or the first detection pin.

[0007] The anti-disassembly structure further includes at least one shielding cover provided on the main board. The encryption module is located inside the shielding cover. The flexible circuit board includes at least one connection portion connected to at least one of the shielding covers. Each connection portion includes a first circuit layer having impedance. The encryption module is used to obtain the impedance value of the flexible circuit board.

[0008] Optionally, the anti-disassembly structure further includes a conductive sheet, a second conductive member, and a second detection pin provided on the main board and electrically connected to the encryption module. The second conductive member is located between the conductive sheet and the second detection pin.

[0009] When the terminal device is in the assembled state, the conductive sheet and the second detection pin are pressed, the conductive sheet and the second detection pin are in close contact with the second conductive member, and the conductive sheet is electrically connected to the second detection pin through the second conductive member. When the terminal device is in the disassembled state, an interval is formed between the second conductive member and the conductive sheet and / or the second detection pin.

[0010] Optionally, the encryption module includes an encryption chip. The encryption chip has a first connection pin, and the first connection pin is electrically connected to the first detection pin. The encryption chip is configured to obtain the impedance value of the flexible circuit board through the first connection pin.

[0011] The encryption chip is configured to encrypt information according to key data. The encryption chip is configured to clear the key data when the change amount of the impedance value exceeds a preset value and / or when the impedance value is not obtained.

[0012] Optionally, the encryption module includes an encryption chip. The encryption chip has a second connection pin, and the second connection pin is electrically connected to the second detection pin.

[0013] When the conductive sheet is electrically connected to the second detection pin through the second conductive member, the second connection pin is in the first level state. When an interval is formed between the second conductive member and the conductive sheet and / or the second detection pin, the second connection pin is in the second level state.

[0014] The encryption chip is configured to encrypt information according to key data. The encryption chip is configured to clear the key data when the second connection pin is in the second level state.

[0015] Optionally, the first conductive member is a first zebra strip, and the second conductive member is a second zebra strip.

[0016] Optionally, at least one of the shielding covers includes a first shielding cover and a second shielding cover, and the first conductive member is located between the first shielding cover and the second shielding cover.

[0017] At least one of the connecting portions includes a first connecting portion and a second connecting portion. The first connecting portion and the second connecting portion are respectively connected to the first shielding cover and the second shielding cover.

[0018] Optionally, the first connecting portion is bonded to the front side of the first shielding cover away from the main board, and the second connecting portion is bonded to the front side of the second shielding cover away from the main board.

[0019] Optionally, the encryption module further includes a security chip communicatively connected to the encryption chip. The security chip is used to store the key data, and the encryption chip is used to clear the key data stored in the security chip.

[0020] Optionally, a central processing unit is provided on the main board. The encryption chip is communicatively connected to the central processing unit, and the encryption chip is used to encrypt the information transmitted by the central processing unit according to the key data.

[0021] In a second aspect, an embodiment of the present invention provides a terminal device, including the anti-disassembly structure described above.

[0022] In the embodiment of the present invention, after the terminal device is disassembled without authorization, the flexible circuit board and the first conductive member are not pressed tightly, and a gap is formed between the first conductive member and the flexible circuit board and / or the first detection pin. The electrical connection between the flexible circuit board and the first conductive member and / or between the first detection pin and the first conductive member is disconnected, so that the electrical connection between the flexible circuit board and the encryption module is disconnected. After the encryption module senses the disconnection of the electrical connection between the flexible circuit board and the encryption module, it will activate the protection mechanism. In addition, when the terminal device is disassembled without authorization to separate the connection between the shielding cover and the connecting portion, the connecting portion will be damaged, the first circuit layer located in the connecting portion will be damaged, and the impedance value of the flexible circuit board will change. After the encryption module senses the change in the impedance value of the flexible circuit board, it will activate the protection mechanism. In summary, the anti-disassembly structure provided in this embodiment realizes anti-disassembly detection through two different methods: determining whether the electrical connection between the flexible circuit board and the encryption module is disconnected and whether the impedance value of the flexible circuit board changes, providing dual different types of anti-disassembly protection, that is, providing double insurance for anti-disassembly, thereby improving the anti-disassembly level, and further improving the security level of the terminal device, being able to prevent information from being stolen after disassembly, and more effectively protecting information security.

[0023] The above description is only an overview of the technical solution of the present invention. In order to be able to understand the technical means of the present invention more clearly, it can be implemented according to the content of the specification. And in order to make the above and other purposes, features and advantages of the present invention more obvious and understandable, the following specifically gives the specific embodiments of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic structural diagram of an anti-disassembly structure provided by an embodiment of the present invention;

[0025] Figure 2 It is a schematic electrical connection diagram of an anti-disassembly structure provided by an embodiment of the present invention;

[0026] Figure 3 It is a schematic structural diagram of a first zebra stripe in an anti-disassembly structure provided by an embodiment of the present invention;

[0027] Figure 4 Schematic diagram of a flexible circuit board in an anti-disassembly structure provided by an embodiment of the present invention;

[0028] Figure 5 Schematic diagram of another anti-disassembly structure provided by an embodiment of the present invention;

[0029] Figure 6 Schematic diagram of the electrical connection of another anti-disassembly structure provided by an embodiment of the present invention.

[0030] Reference numerals:

[0031] 1 - main board, 2 - encryption module, 21 - encryption chip, 22 - security chip, 3 - flexible circuit board, 31 - first connection part, 32 - second connection part, 33 - first circuit layer, 34 - gold finger, 35 - second circuit layer, 4 - first zebra strip, 41 - first insulating layer, 42 - first conductive layer, 5 - first shielding cover, 6 - second shielding cover, 7 - conductive sheet, 8 - second zebra strip, 9 - central processing unit. Detailed implementation manners

[0032] Hereinafter, exemplary embodiments of the present invention will be described in more detail with reference to the accompanying drawings. Although the exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided so that the present invention can be more thoroughly understood and the scope of the present invention can be completely conveyed to those skilled in the art.

[0033] In a first aspect, referring to Figures 1 to 6 , an embodiment of the present invention discloses an anti-disassembly structure applied to a terminal device. The anti-disassembly structure includes a main board 1, an encryption module 2 disposed on the main board 1, a flexible circuit board 3, a first conductive member, and a first detection pin disposed on the main board 1 and electrically connected to the encryption module 2. The first conductive member is located between the flexible circuit board 3 and the first detection pin. When the terminal device is in an assembled state, the flexible circuit board 3 and the first conductive member are pressed tightly, the flexible circuit board 3 and the first detection pin are in close contact with the first conductive member, and the flexible circuit board 3 is electrically connected to the first detection pin through the first conductive member. When the terminal device is in a disassembled state, the first conductive member forms a gap with the flexible circuit board 3 and / or the first detection pin. The anti-disassembly structure further includes at least one shielding cover disposed on the main board 1. The encryption module 2 is located inside the shielding cover. The flexible circuit board 3 includes at least one connection part connected to at least one shielding cover. Each connection part includes a first circuit layer 33 having an impedance. The encryption module 2 is configured to obtain the impedance value of the flexible circuit board 3.

[0034] Among them, the terminal device can be a mobile phone, a POS (Point of Sale) machine, a bus ticket collector, etc. A variety of electronic components are provided on the main board 1. The first detection pin is exposed on the surface of the main board 1, and the encryption module 2 is specifically electrically connected to the first detection pin through internal wiring of the main board 1. The first conductive member has electrical conductivity, and the first conductive member can be the first zebra strip 4, the first metal conductive block, etc. The flexible circuit board 3 includes a gold finger 34, and the position of the gold finger 34 corresponds to the position of the first conductive member. After the flexible circuit board 3 and the first conductive member are pressed tightly, the gold finger 34 is in close contact with the first conductive member, so that the flexible circuit board 3 is electrically connected to the first conductive member through the gold finger 34. The length and width of the flexible circuit board 3 can be set according to actual needs. For example, the length of the flexible circuit board 3 can be set to 15 mm - 17 mm, and the width of the flexible circuit board 3 can be set to 13 mm - 15 mm.

[0035] The terminal device may include a front shell assembly and a rear shell assembly. The front shell assembly includes a display screen. After the front shell assembly and the rear shell assembly are clamped together, the front shell assembly presses the flexible circuit board 3 and the first conductive member, so that the flexible circuit board 3 and the first detection pin are in close contact with the first conductive member. The front shell assembly may include an interference fit structure, and the position of the interference fit structure corresponds to the position of the first conductive member. After the front shell assembly and the rear shell assembly are clamped together, the interference fit structure presses the flexible circuit board 3 and the first conductive member. The interference fit structure can be a plastic protrusion, a rubber block, a plastic spring, etc.

[0036] Under normal circumstances, the terminal device is in an assembled state, the front shell assembly and the rear shell assembly are clamped together, the flexible circuit board 3 and the first conductive member are pressed tightly, the flexible circuit board 3 and the first detection pin are in close contact with the first conductive member, and the flexible circuit board 3 is electrically connected to the encryption module 2 through the first conductive member and the first detection pin. After the terminal device is disassembled without authorization, that is, when the terminal device is in a disassembled state, the front shell assembly and the rear shell assembly are not clamped together, the flexible circuit board 3 and the first conductive member are not pressed tightly, a gap is formed between the first conductive member and the flexible circuit board 3 and / or the first detection pin, and the electrical connection between the flexible circuit board 3 and the first conductive member and / or between the first detection pin and the first conductive member is disconnected, so that the electrical connection between the flexible circuit board 3 and the encryption module 2 is disconnected. After the encryption module 2 senses that the electrical connection between the flexible circuit board 3 and the encryption module 2 is disconnected, it will activate the protection mechanism.

[0037] A shielding cover is a metal cover used to block or shield radiation and signals. The shielding cover is usually used to protect sensitive components from being affected. The encryption module 2 is located inside the shielding cover. After the terminal device is disassembled without authorization, the shielding cover needs to be removed to expose the encryption module 2. The flexible circuit board 3 further includes a main body portion connected to the connecting portion. The main body portion includes a second circuit layer 35 electrically connected to the first circuit layer 33. The first circuit layer 33 and the second circuit layer 35 form a complete circuit layer. The impedance value of the complete circuit layer can be set according to actual requirements. For example, the impedance value of the complete circuit layer can be set to about 2.5 KΩ.

[0038] Since the flexible circuit board 3 is fragile and the connecting portion in the flexible circuit board 3 is connected to the shielding cover, when separating the connection between the shielding cover and the connecting portion, for example, when tearing the flexible circuit board 3, the connecting portion is easily damaged. When the terminal device is disassembled without authorization and the connection between the shielding cover and the connecting portion is separated, the connecting portion will be damaged, the first circuit layer 33 located at the connecting portion will be damaged, and the impedance value of the flexible circuit board 3 will change. After the encryption module 2 senses the change in the impedance value of the flexible circuit board 3, it will activate the protection mechanism.

[0039] The encryption module 2 may include an encryption chip 21. The encryption chip 21 is used to encrypt the information that needs to be encrypted. The encryption chip 21 specifically encrypts the information according to the key data. The protection mechanism may be that when the encryption chip 21 detects disassembly without authorization, it will clear the key data.

[0040] In the embodiment of the present utility model, after the terminal device is disassembled without authorization, the flexible circuit board 3 and the first conductive member are not pressed tightly, the first conductive member forms a gap with the flexible circuit board 3 and / or the first detection pin, and the electrical connection between the flexible circuit board 3 and the first conductive member and / or between the first detection pin and the first conductive member is disconnected, so that the electrical connection between the flexible circuit board 3 and the encryption module 2 is disconnected. After the encryption module 2 senses the disconnection of the electrical connection between the flexible circuit board 3 and the encryption module 2, it will activate the protection mechanism. In addition, when the terminal device is disassembled without authorization and the connection between the shielding cover and the connecting portion is separated, the connecting portion will be damaged, the first circuit layer 33 located at the connecting portion will be damaged, and the impedance value of the flexible circuit board 3 will change. After the encryption module 2 senses the change in the impedance value of the flexible circuit board 3, it will activate the protection mechanism.

[0041] In summary, the anti-disassembly structure provided in this embodiment realizes anti-disassembly detection in two different ways by determining whether the electrical connection between the flexible circuit board 3 and the encryption module 2 is disconnected and whether the impedance value of the flexible circuit board 3 changes, providing two different types of anti-disassembly protection, that is, providing a double anti-disassembly insurance, thereby improving the anti-disassembly level, and further improving the security level of the terminal device, being able to avoid the theft of information after disassembly, and more effectively protecting information security.

[0042] In a preferred embodiment of the present utility model, referring to Figure 5 , the anti-disassembly structure further includes a conductive sheet 7, a second conductive member, and a second detection pin disposed on the main board 1 and electrically connected to the encryption module 2. The second conductive member is located between the conductive sheet 7 and the second detection pin. When the terminal device is in the assembled state, the conductive sheet 7 and the second detection pin are pressed tightly, the conductive sheet 7 and the second detection pin are in close contact with the second conductive member, and the conductive sheet 7 is electrically connected to the second detection pin through the second conductive member. When the terminal device is in the disassembled state, the second conductive member forms a gap with the conductive sheet 7 and / or the second detection pin.

[0043] Among them, the second detection pin is exposed on the surface of the main board 1, and the encryption module 2 is specifically electrically connected to the second detection pin through internal traces of the main board 1. The second conductive member has electrical conductivity, and the second conductive member can be a second zebra strip 8, a second metal conductive block, etc. Under normal circumstances, when the terminal device is in the assembled state, the front shell assembly and the rear shell assembly are tightly closed, the conductive sheet 7 and the second conductive member are pressed tightly, the conductive sheet 7 and the second detection pin are in close contact with the second conductive member, and the conductive sheet 7 is electrically connected to the encryption module 2 through the second conductive member and the second detection pin. After the terminal device is disassembled without authorization, that is, when the terminal device is in the disassembled state, the front shell assembly and the rear shell assembly are not tightly closed, the conductive sheet 7 and the second conductive member are not pressed tightly, the second conductive member forms a gap with the conductive sheet 7 and / or the second detection pin, and the electrical connection between the conductive sheet 7 and the second conductive member and / or between the second detection pin and the second conductive member is disconnected, so that the electrical connection between the conductive sheet 7 and the encryption module 2 is disconnected. After the encryption module 2 senses that the electrical connection between the conductive sheet 7 and the encryption module 2 is disconnected, it activates the protection mechanism. In this embodiment, in addition to the anti-disassembly point of the flexible circuit board 3, the first conductive member, and the first detection pin, a anti-disassembly point of the conductive sheet 7, the second conductive member, and the second detection pin is also provided, further improving the anti-disassembly level.

[0044] In a preferred embodiment of the present utility model, referring to Figure 2 , the encryption module 2 includes an encryption chip 21. The encryption chip 21 has a first connection pin, and the first connection pin is electrically connected to the first detection pin. The encryption chip 21 is used to obtain the impedance value of the flexible circuit board 3 through the first connection pin; the encryption chip 21 is used to encrypt information according to the key data, and the encryption chip 21 is used to clear the key data when the change amount of the impedance value exceeds a preset value and / or when the impedance value is not obtained.

[0045] Among them, the encryption chip 21 is an integrated circuit (IC) chip, which has extremely high confidentiality and security. The first connection pin can be an ADC (Analog-to-Digital Converter) pin. Under normal circumstances, when the terminal device is in the assembled state, the flexible circuit board 3 and the first conductive member are pressed tightly, the flexible circuit board 3 and the first detection pin are in close contact with the first conductive member, and the flexible circuit board 3 is electrically connected to the encryption chip 21 in the encryption module 2 through the first conductive member, the first detection pin, and the first connection pin. At this time, the encryption chip 21 can obtain the impedance value of the flexible circuit board 3. After the electrical connection between the flexible circuit board 3 and the encryption chip 21 is disconnected, the encryption chip 21 cannot obtain the impedance value. At this time, the encryption chip 21 clears the key data.

[0046] Affected by environmental factors, under normal circumstances, the impedance value of the flexible circuit board 3 may have a slight normal change. When the terminal device is disassembled and the connection between the shielding cover and the connecting part is separated without authorization, the connecting part will be damaged, and the first circuit layer 33 located in the connecting part will be damaged, and the impedance value of the flexible circuit board 3 will change greatly. Therefore, in this embodiment, it is defined that the key data is cleared when the change amount of the impedance value exceeds a preset value to avoid misjudgment caused by the normal change of the impedance value. The preset value can be set according to actual needs, and this embodiment does not limit this.

[0047] In a preferred embodiment of the present invention, referring to Figure 6 , the encryption chip 21 has a second connection pin, and the second connection pin is electrically connected to the second detection pin; when the conductive sheet 7 is electrically connected to the second detection pin through the second conductive member, the second connection pin is in the first level state, and when the second conductive member forms a gap with the conductive sheet 7 and / or the second detection pin, the second connection pin is in the second level state; the encryption chip 21 is used to clear the key data when the second connection pin is in the second level state.

[0048] Among them, the conductive sheet 7 plays a short-circuit role. Under normal circumstances, a detection circuit in the encryption chip 21 is electrically connected to the conductive sheet 7 through the second connection pin, the second detection pin, and the second conductive member. When the second conductive member forms a gap with the conductive sheet 7 and / or the second detection pin, the electrical connection between the conductive sheet 7 and the second connection pin of the encryption chip 21 is disconnected, the detection circuit forms an open circuit, and the level state of the second connection pin of the encryption chip 21 will change. Preferably, the level when the second connection pin is in the second level state is higher than the level when the second connection pin is in the first level state.

[0049] In a preferred embodiment of the present invention, referring to Figure 3 and Figure 6 , the first conductive member is the first zebra strip 4, and the second conductive member is the second zebra strip 8.

[0050] Among them, the zebra strip is a vertically conductive carbon particle material used for inter-board connection, which can achieve effective electrical connection under slight pressure. Both the first zebra strip 4 and the second zebra strip 8 have efficient and reliable electrical conductivity. The first zebra strip 4 includes a first insulating layer 41 and a first conductive layer 42 arranged alternately along its length direction. The first insulating layer 41 can be made of insulating silica gel, and the first conductive layer 42 can be made of conductive silica gel. The resistivity of the first conductive layer 42 can be 3Ω·cm - 15Ω·cm, and the resistance of the first insulating layer 41 can be greater than or equal to 1012Ω. The maximum operating current density of the first zebra strip 4 can be 2.5mA / mm 2 . The first zebra strip 4 conducts electricity vertically and does not conduct electricity horizontally.

[0051] The second zebra strip 8 includes a second insulating layer and a second conductive layer arranged alternately along its length direction. The second insulating layer can be made of insulating silica gel, and the second conductive layer can be made of conductive silica gel. The resistivity of the second conductive layer can be 3Ω·cm - 15Ω·cm, and the resistance of the second insulating layer can be greater than or equal to 1012Ω. The maximum operating current density of the second zebra strip 8 can be 2.5mA / mm 2 . The second zebra strip 8 conducts electricity vertically and does not conduct electricity horizontally.

[0052] In a preferred embodiment of the present utility model, referring to Figure 1 , Figure 4 and Figure 5 , at least one shielding cover includes a first shielding cover 5 and a second shielding cover 6, and the first conductive member is located between the first shielding cover 5 and the second shielding cover 6; at least one connecting portion includes a first connecting portion 31 and a second connecting portion 32, and the first connecting portion 31 and the second connecting portion 32 are respectively connected to the first shielding cover 5 and the second shielding cover 6. There are two connection points between the flexible circuit board 3 and the two shielding covers. Coupled with the anti-disassembly point of the flexible circuit board 3, the first conductive member and the first detection pin, and the anti-disassembly point of the conductive sheet 7, the second conductive member and the second detection pin, the anti-disassembly structure provided in this embodiment has a total of four anti-disassembly points, providing multiple anti-disassembly protections and further improving the anti-disassembly level.

[0053] In a preferred embodiment of the present utility model, the first connecting portion 31 is bonded to the front side of the first shielding cover 5 away from the main board 1, and the second connecting portion 32 is bonded to the front side of the second shielding cover 6 away from the main board 1. The first connecting portion 31 can be specifically bonded to the first shielding cover 5 through glue or double-sided tape, and the second connecting portion 32 can be specifically bonded to the second shielding cover 6 through glue or double-sided tape. In this embodiment, the first connecting portion 31 and the second connecting portion 32 are respectively bonded to the first shielding cover 5 and the second shielding cover 6 to ensure good connection performance.

[0054] In a preferred embodiment of the present utility model, referring to Figure 2 and Figure 6 , the encryption module 2 further includes a security chip 22 communicatively connected to the encryption chip 21. The security chip 22 is used to store key data, and the encryption chip 21 is used to clear the key data stored in the security chip. Among them, the security chip 22 is used to send the key data to the encryption chip 21 so that the encryption chip 21 encrypts the information according to the key data. The security chip 22 usually has a very high security design and can prevent the key data from being read or tampered with externally.

[0055] In a preferred embodiment of the present utility model, referring to Figure 2 and Figure 6 , a Central Processing Unit (CPU) 9 is provided on the main board 1. The encryption chip 21 is communicatively connected to the central processor 9. The encryption chip 21 is used to encrypt the information transmitted by the central processor 9 according to the key data. Among them, the central processor 9 can be communicatively connected to the encryption chip 21 through an SPI (Serial Peripheral Interface) bus. The central processor 9 sends the information to be encrypted to the encryption chip 21, and the encryption chip 21 encrypts the information according to the key data. After the encryption chip 21 encrypts the information, it can send the encrypted information to the central processor 9. In this embodiment, the encryption process is completely completed within the independent encryption chip 21, avoiding relying on the computing resources of the central processor 9 during data encryption and reducing the burden on the central processor 9.

[0056] In a second aspect, an embodiment of the present utility model also discloses a terminal device, including the anti-disassembly structure provided in the first aspect. Since the terminal device includes the above anti-disassembly structure, it also has the beneficial effects of the above anti-disassembly structure, which will not be elaborated here.

[0057] The terminal device may include a front shell assembly and a rear shell assembly. The front shell assembly includes a display screen. After the front shell assembly and the rear shell assembly are tightened, the front shell assembly presses the flexible circuit board 3 and the first conductive member, so that the flexible circuit board 3 and the first detection pin are in close contact with the first conductive member. The front shell assembly may include an interference fit structure, and the position of the interference fit structure corresponds to the position of the first conductive member. After the front shell assembly and the rear shell assembly are tightened, the interference fit structure presses the flexible circuit board 3 and the first conductive member. The interference fit structure may be a plastic protrusion, a rubber block, a plastic spring, etc.

[0058] It should be noted that in this text, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, such that a process, method, article or device comprising a series of elements not only includes those elements but also other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the presence of additional identical elements in the process, method, article or device comprising such element.

[0059] The embodiments of the present utility model have been described above in conjunction with the accompanying drawings. However, the present utility model is not limited to the above specific embodiments. The above specific embodiments are merely illustrative rather than restrictive. Under the inspiration of the present utility model, those of ordinary skill in the art can also make many forms without departing from the purpose of the present utility model and the scope protected by the claims. All of these fall within the protection scope of the present utility model.

Claims

1. An anti-disassembly structure is applied to a terminal device, characterized in that, The anti-disassembly structure includes a main board, an encryption module disposed on the main board, a flexible circuit board, a first conductive member, and a first detection pin disposed on the main board and electrically connected to the encryption module. The first conductive member is located between the flexible circuit board and the first detection pin; When the terminal device is in an assembled state, the flexible circuit board and the first conductive member are pressed tightly, the flexible circuit board and the first detection pin are in close contact with the first conductive member, and the flexible circuit board is electrically connected to the first detection pin through the first conductive member. When the terminal device is in a disassembled state, the first conductive member forms a gap with the flexible circuit board and / or the first detection pin; The anti-disassembly structure further includes at least one shielding cover disposed on the main board. The encryption module is located inside the shielding cover. The flexible circuit board includes at least one connection portion connected to at least one of the shielding covers. Each connection portion includes a first circuit layer having an impedance. The encryption module is configured to obtain the impedance value of the flexible circuit board.

2. The anti-disassembly structure according to claim 1, wherein The anti-disassembly structure further includes a conductive sheet, a second conductive member, and a second detection pin disposed on the main board and electrically connected to the encryption module. The second conductive member is located between the conductive sheet and the second detection pin; When the terminal device is in an assembled state, the conductive sheet and the second detection pin are pressed tightly, the conductive sheet and the second detection pin are in close contact with the second conductive member, and the conductive sheet is electrically connected to the second detection pin through the second conductive member. When the terminal device is in a disassembled state, the second conductive member forms a gap with the conductive sheet and / or the second detection pin.

3. The anti-disassembly structure according to claim 1, wherein, The encryption module includes an encryption chip. The encryption chip has a first connection pin. The first connection pin is electrically connected to the first detection pin. The encryption chip is configured to obtain the impedance value of the flexible circuit board through the first connection pin; The encryption chip is configured to encrypt information according to key data. The encryption chip is configured to clear the key data when the change amount of the impedance value exceeds a preset value and / or when the impedance value is not obtained.

4. The anti-disassembly structure according to claim 2, characterized in that, The encryption module includes an encryption chip. The encryption chip has a second connection pin. The second connection pin is electrically connected to the second detection pin; When the conductive sheet is electrically connected to the second detection pin through the second conductive member, the second connection pin is in a first level state. When the second conductive member forms a gap with the conductive sheet and / or the second detection pin, the second connection pin is in a second level state; The encryption chip is configured to encrypt information according to key data. The encryption chip is configured to clear the key data when the second connection pin is in the second level state.

5. The anti-disassembly structure according to claim 2, characterized in that, The first conductive member is a first zebra stripe, and the second conductive member is a second zebra stripe.

6. The anti-disassembly structure according to any one of claims 1 to 5, characterized in that At least one of the shielding covers includes a first shielding cover and a second shielding cover. The first conductive member is located between the first shielding cover and the second shielding cover; At least one of the connecting parts includes a first connecting part and a second connecting part, and the first connecting part and the second connecting part are respectively connected to the first shielding cover and the second shielding cover.

7. The anti-disassembly structure according to claim 6, characterized in that The first connecting part is bonded to the front side of the first shielding cover away from the main board, and the second connecting part is bonded to the front side of the second shielding cover away from the main board.

8. The anti-disassembly structure according to claim 3 or 4, characterized in that, The encryption module further includes a security chip communicatively connected to the encryption chip. The security chip is used for storing the key data, and the encryption chip is used for clearing the key data stored in the security chip.

9. The anti-disassembly structure according to claim 3 or 4, characterized in that, A central processor is provided on the main board. The encryption chip is communicatively connected to the central processor, and the encryption chip is used for encrypting the information transmitted by the central processor according to the key data.

10. A terminal device, characterized in that, It includes the anti-disassembly structure according to any one of claims 1 to 9.

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