FPC soft board EMC shielding ground structure

Abstract

The utility model belongs to the field of electronic equipment shielding ground connection, especially a kind of FPC soft board EMC shielding ground connection structure, including wire rod, FPC soft board and EMC ground sheet, and the one end of wire rod is equipped with guide shell, and wire rod includes 40 coaxial lines, and coaxial line penetrates guide shell, the coaxial line includes center conductor, inner sheath, coaxial line weaving and outer sheath, the outside of center conductor is equipped with inner sheath, the outside of inner sheath is equipped with coaxial line weaving, the outside of coaxial line weaving is equipped with outer sheath, and a same EMC ground sheet is equipped on multiple coaxial line weaving, and the both sides of EMC ground sheet are equipped with welding teeth. The utility model design is reasonable, and multiple coaxial line shielding and stable ground connection are realized by integral EMC ground sheet, welding teeth, coaxial line is orderly combed with the aid of guide seat, bolt dismounting mechanism is convenient maintenance, and it can be realized that FPC signal pin, center conductor and EMC ground sheet are automatically welded once by automatic HB welding, and production efficiency can be provided.

Description

Technical Field

[0001] This utility model relates to the field of electronic equipment shielding and grounding technology, and in particular to an EMC shielding and grounding structure for FPC flexible boards. Background Technology

[0002] In electronic devices, electromagnetic compatibility (EMC) is a crucial indicator of performance. Good EMC performance prevents electromagnetic interference and also protects other devices from electromagnetic radiation generated by the device itself. Flexible printed circuit boards (FPCs) are widely used in various electronic devices due to their flexibility, bendability, and small installation space requirements.

[0003] In the structure connecting FPC flexible boards and wires, the wires usually contain multiple coaxial cables for signal transmission. However, multiple coaxial cables are easily affected by external electromagnetic interference during signal transmission and also generate electromagnetic radiation, affecting the stability and accuracy of signal transmission. HB semi-automatic soldering of the FPC signal pin + MCC coaxial cable center conductor is performed in one soldering operation, and the two sides of the FPC corresponding EMC shielding grounding plate need to be manually soldered a second time. This makes it impossible to achieve one-time soldering of the FPC signal pin + MCC coaxial cable shielding layer grounding. The secondary soldering affects the soldering production efficiency and cannot achieve industrial automation. Therefore, we propose an FPC flexible board EMC shielding grounding structure to solve the above problems. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing an EMC shielding and grounding structure for FPC flexible boards.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] An EMC shielding and grounding structure for an FPC flexible board includes wires, an FPC flexible board, and an EMC grounding plate. One end of the wire is fitted with a guide shell. The wire includes 40 coaxial cables that pass through the guide shell. Each coaxial cable includes a center conductor, an inner sheath, coaxial braid, and an outer sheath. The inner sheath is located outside the center conductor, the coaxial braid is located outside the inner sheath, and the outer sheath is located outside the coaxial braid. The same EMC grounding plate is mounted on multiple coaxial braids, and soldering teeth are provided on both sides of the EMC grounding plate. Multiple pin connectors are mounted on the top of the FPC flexible board, and the center conductor is connected to the corresponding pin connector. EMC grounding plate soldering pads are mounted on both sides of the top of the FPC flexible board, and the soldering teeth on the EMC grounding plate are connected to the EMC grounding plate soldering pads.

[0007] Preferably, the guide shell has a mounting hole on its front inner wall, and an upper guide seat for coaxial guidance is provided in the mounting hole.

[0008] Preferably, a lower guide seat is installed on the rear inner wall of the guide shell, and the lower guide seat and the upper guide seat are on the same horizontal line.

[0009] Preferably, the top of the upper guide seat has an upper guide hole with one side open, and the top of the lower guide seat has a lower guide hole with one side open, and the corresponding upper guide hole and lower guide hole are coaxially connected.

[0010] Preferably, the upper guide seat has fixing grooves on both sides, and the guide shell has disassembly and assembly mechanisms that are adapted to the fixing grooves on both sides.

[0011] Preferably, the disassembly and assembly mechanism includes threaded holes and fixing bolts. Threaded holes communicating with mounting holes are provided on both sides of the guide shell, and fixing bolts adapted to the fixing grooves are installed in the threaded holes.

[0012] The beneficial effects of this utility model are:

[0013] 1. By setting the same EMC grounding plate on multiple coaxial cable braids, the overall shielding of 40 coaxial cables can be achieved, which greatly enhances the shielding effect, effectively reduces the impact of external electromagnetic interference on the signal transmission of the coaxial cables, and also reduces the electromagnetic radiation generated by the coaxial cables themselves, ensuring the stability and accuracy of signal transmission.

[0014] 2. The EMC grounding plate has welding teeth on both sides, and the EMC grounding plate welding PAD on the FPC flexible board is flush with the 40 signal pin connectors. Automatic HB welding is used to complete the welding of the 40 signal pins and the EMC grounding plate in one go, realizing the automatic welding of the FPC signal pins, center conductor and EMC grounding plate in one go, which not only improves welding efficiency, but also ensures the stability of welding quality.

[0015] 3. The guide housing is equipped with an upper guide seat and a lower guide seat. The upper guide seat and the lower guide seat are respectively provided with upper guide holes and lower guide holes, which can effectively guide 40 coaxial cables, so that the coaxial cables are arranged in an orderly manner in the guide housing, avoiding the coaxial cables from getting tangled together. It also facilitates the precise connection of the coaxial cables to the pin connectors on the FPC flexible board. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of an EMC shielding and grounding structure for an FPC flexible board proposed in this utility model;

[0017] Figure 2 This is a three-dimensional structural diagram of the wire, guide shell, and coaxial cable of the EMC shielding and grounding structure of the FPC flexible board proposed in this utility model.

[0018] Figure 3This is a three-dimensional structural diagram of the EMC grounding plate of the EMC shielding grounding structure of the FPC flexible board proposed in this utility model;

[0019] Figure 4 This is a schematic diagram of part A of the EMC shielding and grounding structure of an FPC flexible board proposed in this utility model;

[0020] Figure 5 This is a three-dimensional structural diagram of an FPC flexible board with an EMC shielding and grounding structure proposed in this utility model.

[0021] Figure 6 This is a top cross-sectional view of the guide shell of the FPC flexible board EMC shielding and grounding structure proposed in this utility model.

[0022] Figure 7 This is a schematic diagram of part B of the EMC shielding and grounding structure of an FPC flexible board proposed in this utility model.

[0023] In the diagram: 101, wire; 102, guide shell; 103, coaxial cable; 104, FPC flexible board; 105, pin connector; 106, EMC grounding pad; 107, EMC grounding pad; 108, welding teeth; 201, center conductor; 202, inner sheath; 203, coaxial cable braid; 204, outer sheath; 301, lower guide seat; 302, lower guide hole; 303, upper guide seat; 304, upper guide hole; 401, fixing groove; 402, threaded hole; 403, fixing bolt. Detailed Implementation

[0024] The following is in conjunction with the appendix Figure 1-7 This application will be described in further detail.

[0025] This application discloses an EMC shielding and grounding structure for FPC flexible boards.

[0026] Reference Figure 1-7An EMC shielding and grounding structure for an FPC flexible board 104 includes a wire 101, an FPC flexible board 104, and an EMC grounding plate 107. One end of the wire 101 is fitted with a guide shell 102. The wire includes 40 coaxial cables 103, which penetrate the guide shell 102. Each coaxial cable 103 includes a center conductor 201, an inner sheath 202, a coaxial braid 203, and an outer sheath 204. The inner sheath 202 is located outside the center conductor 201, the coaxial braid 203 is located outside the inner sheath 202, and the outer sheath 204 is located outside the coaxial braid 203. The same EMC grounding plate 107 is mounted on multiple coaxial braids 203, and welding teeth 108 are provided on both sides of the EMC grounding plate 107. Multiple pin connectors 105 are mounted on the top of the FPC flexible board 104, and the center conductor 201 is connected to the corresponding pin connector 105. The FPC flexible board 104 has EMC grounding pads 106 mounted on both sides of its top. The welding teeth 108 on the EMC grounding pad 107 are connected to the EMC grounding pads 106. The top of the FPC flexible board 104 has multiple pin connectors 105, and the center conductor 201 is connected to the corresponding pin connector 105. The EMC grounding pads 106 are mounted on both sides of the top of the FPC flexible board 104. The EMC grounding pads 106 are flush with 40 signal pins. The welding teeth 108 on the EMC grounding pad 107 are connected to the EMC grounding pads 106. Automatic HB soldering is used to complete the soldering of 40 signal pins and EMC grounding pads 107 in one go, realizing the automatic soldering of FPC signal pins, center conductor 201 and EMC grounding pads 107 in one go.

[0027] In this embodiment, a mounting hole is provided on the front inner wall of the guide housing 102, and an upper guide seat 303 for guiding the coaxial cable 103 is provided in the mounting hole. A lower guide seat 301 is installed on the rear inner wall of the guide housing 102. The lower guide seat 301 and the upper guide seat 303 are on the same horizontal line. An upper guide hole 304 with one side open is provided on the top of the upper guide seat 303, and a lower guide hole 302 with one side open is provided on the top of the lower guide seat 301. The coaxial cable 103 passes through the corresponding upper guide hole 304 and lower guide hole 302. Through the corresponding and open guide holes, the coaxial cables 103 are arranged in an orderly manner, and it is convenient to inspect or replace a single coaxial cable 103 in the future without disassembling the entire guide housing 102.

[0028] In this embodiment, the upper guide seat 303 has fixing grooves 401 on both sides, and the guide shell 102 has disassembly and assembly mechanisms adapted to the fixing grooves 401 on both sides. The disassembly and assembly mechanisms include threaded holes 402 and fixing bolts 403. The guide shell 102 has threaded holes 402 that communicate with the mounting holes on both sides. The fixing bolts 403 adapted to the fixing grooves 401 are installed in the threaded holes 402. Through the cooperation between the bolts and the fixing grooves 401, the stability of the upper guide seat 303 after installation can be guaranteed, and the disassembly and assembly operations can be quickly completed when the guide seat is worn or the coaxial line 103 fails, reducing maintenance time and costs.

[0029] In this invention, by setting the same EMC grounding plate 107 on multiple coaxial braids 203, overall shielding of 40 coaxial cables 103 can be achieved, greatly enhancing the shielding effect and effectively reducing the impact of external electromagnetic interference on the signal transmission of the coaxial cables 103. It also reduces the electromagnetic radiation generated by the coaxial cables 103 themselves, ensuring the stability and accuracy of signal transmission. The EMC grounding plate 107 has welding teeth 108 on both sides, and the EMC grounding plate welding PAD 106 on the FPC flexible board 104 is flush with the 40 signal pin connectors 105. Automatic HB soldering is used to complete the soldering of the 40 signal pins and the EMC grounding plate 107 in one go, realizing the connection between the FPC signal pins, the center conductor 201, and the EMC grounding. The automatic welding of sheet 107 not only improves welding efficiency and ensures the stability of welding quality, but also provides an upper guide seat 303 and a lower guide seat 301 inside the guide housing 102. The upper guide seat 303 and the lower guide seat 301 are respectively provided with upper guide holes 304 and lower guide holes 302, which can effectively guide 40 coaxial cables 103, so that the coaxial cables 103 are arranged in an orderly manner inside the guide housing 102, avoiding the coaxial cables 103 from getting tangled together. At the same time, it is also convenient for the coaxial cables 103 to be accurately connected to the pin connectors 105 on the FPC flexible board 104. The upper guide seat 303 can be disassembled and assembled by fixing bolts 403 and fixing grooves 401, so as to facilitate the sequential arrangement of 40 coaxial cables 103 through the guide housing 102.

[0030] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. An EMC shielding and grounding structure for FPC flexible printed circuit boards, characterized in that, It includes a wire (101), an FPC flexible board (104) and an EMC grounding piece (107). One end of the wire (101) is equipped with a guide shell (102). The wire (101) includes 40 coaxial cables (103), and the coaxial cables (103) pass through the guide shell (102). The coaxial cable (103) includes a center conductor (201), an inner sheath (202), a coaxial braid (203), and an outer sheath (204). The center conductor (201) has an inner sheath (202) on its outer side, the inner sheath (202) has a coaxial braid (203) on its outer side, and the coaxial braid (203) has an outer sheath (204) on its outer side. The same EMC grounding plate (107) is provided on multiple coaxial braids (203). The EMC grounding plate (107) has welding teeth (108) on both sides. The top of the FPC flexible board (104) is equipped with multiple pin connectors (105), and the center conductor (201) is connected to the corresponding pin connector (105). EMC grounding plate welding PADs (106) are installed on both sides of the top of the FPC flexible board (104), and the welding teeth (108) on the EMC grounding plate (107) are connected to the EMC grounding plate welding PADs (106).

2. The FPC flexible board EMC shielding and grounding structure according to claim 1, characterized in that, The guide shell (102) has a mounting hole on its front inner wall, and an upper guide seat (303) for guiding the coaxial line (103) is provided in the mounting hole.

3. The FPC flexible board EMC shielding and grounding structure according to claim 1, characterized in that, A lower guide seat (301) is installed on the rear inner wall of the guide shell (102), and the lower guide seat (301) and the upper guide seat (303) are on the same horizontal line.

4. The FPC flexible board EMC shielding and grounding structure according to claim 3, characterized in that, The upper guide seat (303) has an upper guide hole (304) with one side open at the top, and the lower guide seat (301) has a lower guide hole (302) with one side open at the top, and the coaxial line (103) passes through the corresponding upper guide hole (304) and lower guide hole (302).

5. The FPC flexible board EMC shielding and grounding structure according to claim 3, characterized in that, The upper guide seat (303) has a fixing groove (401) on both sides, and the guide shell (102) has a disassembly and assembly mechanism that is compatible with the fixing groove (401) on both sides.

6. The FPC flexible board EMC shielding and grounding structure according to claim 5, characterized in that, The disassembly and assembly mechanism includes a threaded hole (402) and a fixing bolt (403). Both sides of the guide shell (102) are provided with threaded holes (402) that communicate with the mounting hole. The threaded holes (402) are threaded with fixing bolts (403) that are compatible with the fixing groove (401).

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