Printed circuit board with double buried holes

Abstract

The utility model relates to the technical field of circuit boards, and discloses a printed circuit board with double buried holes, which comprises a circuit board assembly and a fastening assembly, the circuit board assembly comprises a circuit board body, a filling plate is fixed at the side part of the circuit board body, a through hole is arranged on the filling plate, the buried holes are arranged in the circuit board body, and the fastening assembly is fixed on the circuit board body. The fastening assembly comprises a through hole pipe fixed in the through hole, a connecting groove is formed in the through hole pipe, a butt joint pipe is movably connected in the connecting groove, a fastening screw rod is in threaded connection in the butt joint pipe, and the through hole pipe is installed in the through hole. The bottom end of the fastening screw rod is drilled into the installed shell, meanwhile, the butt joint pipes are installed at the two ends of the through hole pipe, and in the continuous rotating state, the butt joint pipes move towards the deep position of the connecting groove, so that the circuit board is prevented from being pressed, the phenomenon that the circuit board is broken and damaged is avoided, and the practicability is further improved.

Description

Technical Field

[0001] The utility model relates to the technical field of circuit boards, and specifically relates to a printed circuit board with double buried vias. Background Art

[0002] A printed circuit board is a basic material used to support and connect electronic components, usually made by covering a non-conductive substrate with a conductive layer. The PCB plays a key role in modern electronic devices. It provides an effective way to organize and wire electronic components, replacing the traditional point-to-point wiring method. The printed circuit board with double buried vias is a special type of PCB. This design usually means that two or more layers of buried via technology are used in the PCB, that is, the connection between multiple internal layers is realized through holes buried in the layers. Since the buried vias do not occupy the surface space, more wiring and components can be added on the PCB surface. At the same time, more complex circuit designs can be achieved, and the path length and resistance of signal transmission are reduced, which is beneficial to improving the stability and reliability of the circuit. Generally speaking, the double buried via PCB overcomes the space waste and wiring limitations brought by the surface hole limitations in traditional PCBs, providing greater flexibility and performance advantages for the design of complex electronic devices.

[0003] Currently, for the existing printed circuit boards with double buried vias, most of them adopt the stacking of multi-layer circuit boards, and a filling board is installed between the multi-layer circuit boards, and then formed by pressing. However, the edge of the circuit board after pressing is directly exposed, which is easy to be knocked, resulting in damage to the circuit board pattern and making the circuit board unable to be used normally. Content of the Utility Model

[0004] Aiming at the deficiencies of the prior art, the utility model provides a printed circuit board with double buried vias, which has the advantages of being able to ensure the safety and stability of the circuit board and avoiding damage, etc., and solves the problem that the current circuit board and the filling layer are formed by pressing, the edges are flush, and it is easy to be knocked and damaged, resulting in the circuit board being unable to be used.

[0005] To achieve the above object, the utility model provides the following technical solution: A printed circuit board with double buried vias, including a circuit board assembly and a fastening assembly. The circuit board assembly includes a circuit board body. A filling board is fixed on the side of the circuit board body. Through holes are opened on the filling board. At the same time, buried vias are opened in the circuit board body. The circuit board body is composed of multiple layers of printed circuit boards, and filling boards are installed between each layer of printed circuit boards. The filling board makes the electrical connection inside the multiple layers of printed circuit boards more reliable and stable by connecting different levels of circuit paths. At the same time, it can help conduct heat inside the circuit board body, and the filling board can also enhance the overall mechanical strength and stability of the circuit board body, and can also be used to control the impedance of signal transmission lines and reduce the influence of electromagnetic interference.

[0006] The fastening assembly includes a through-hole tube fixed in the through-hole. A connection groove is provided in the through-hole tube. A docking tube is movably connected in the connection groove. A fastening screw is threadedly connected in the docking tube. The diameter of the side part of the through-hole tube matches the diameter in the through-hole, and both ends of the through-hole tube are in an annular shape that opens outward and fits on the outermost circuit board, ensuring the stability of the multi-layer circuit board during pressing. When installing the circuit board body, the fastening screw passes through the through-hole tube, and in a rotating state, the circuit board is fixed at the corresponding position in the housing. At the same time, in a continuously rotating state, the docking tube gradually moves deeper into the connection groove, improving the fixing of the overall installation of the circuit board assembly.

[0007] When processing and preparing a printed circuit board with double buried vias, by providing a circuit board body, and a filling board is bonded to the side of each circuit board body to achieve the assembly of single-layer circuit boards. Multiple single-layer circuit boards are stacked, so that the fixing rods are inserted into the fixing holes opened in the upper and lower corresponding filling boards, and are clamped on the inner wall of the fixing holes by the provided barbs. At the same time, a plurality of fixing nails are installed in the through-hole, and both ends of the fixing nails are fixed on the circuit board body and the filling board of the corresponding layer. Then a through-hole tube is installed in the through-hole. By inserting the fastening screw into the through-hole tube and in a rotating state, the bottom end of the fastening screw drills into the housing at the fixed position. At the same time, in a continuously rotating state, the docking tube gradually moves deeper into the connection groove.

[0008] As a further improvement of the above solution, a partition sliding groove is opened on the filling board.

[0009] Through the above technical solution, the partition sliding groove is located between the circuit board body and the through-hole included in the filling board and plays a role of division, so that during installation, the edges of the circuit board body and the filling board can be effectively distinguished, avoiding damage to the circuit board body when drilling holes for installation.

[0010] As a further improvement of the above solution, fixing holes are opened on the filling board, and fixing rods are inserted into the fixing holes.

[0011] Through the above technical solution, fixing holes are opened at the upper and lower corresponding positions on the edge of the filling board. When multiple filling boards are stacked, the fixing holes opened in adjacent filling boards correspond to each other, and the corresponding fixing holes are fixed by fixing rods.

[0012] As a further improvement of the above solution, barbs are provided at both ends of the fixing rod, and the barbs are clamped in the fixing holes.

[0013] Through the above technical solution, the barbs are closely attached to the inner wall of the fixing hole, increasing the stability between adjacent filling boards.

[0014] As a further improvement of the above solution, an adhesive layer is provided inside the filling plate, and the adhesive layer is adhered to the side of the circuit board body.

[0015] Through the above technical solution, the filling plate is wrapped around the side of the circuit board body, and the inner side of the filling plate and the side of the circuit board body are adhesively fixed through the adhesive layer, avoiding the circuit board body from detaching from the filling plate.

[0016] As a further improvement of the above solution, a plurality of fixing nails are provided in the through hole, and the fixing nails are fixed on the multi-layer circuit board body and the filling plate.

[0017] Through the above technical solution, the fixing nails are in a U shape, and both ends are respectively fixed between the corresponding filling plate and the internal circuit board body, improving the fixing between the circuit board body and the filling plate and avoiding the circuit board body from detaching from the filling plate.

[0018] As a further improvement of the above solution, grid convex strips are provided in the connection groove, and the grid convex strips are attached to the side of the docking pipe.

[0019] Through the above technical solution, the docking pipe is closely attached to the side of the grid convex strip, increasing the stability between the side of the docking pipe and the inner wall of the connection groove. When the fastening screw rotates to fix the circuit board assembly, if the rotation is excessive, the docking pipe gradually moves deeper into the connection groove, preventing the fastening screw from directly pressing the circuit board assembly and damaging the circuit board.

[0020] Compared with the prior art, the present utility model provides a printed circuit board with double buried vias, having the following beneficial effects:

[0021] 1. For this printed circuit board with double buried vias, when it is molded by pressing, the circuit board body is on the top surface of the filling plate, and the edge is wrapped by the filling plate, and the filling plate on the side of the multi-layer circuit board body is flush, thus playing a role in protecting the circuit board body, avoiding edge bumps and damage, and improving the safety and stability of the circuit board during use.

[0022] 2. For this printed circuit board with double buried vias, when fixing the circuit board body, by rotating the fastening screw, the bottom end of the fastening screw drills into the installed housing. At the same time, docking pipes are installed at both ends of the through hole pipe. In the state of continuous rotation, the docking pipes move deeper into the connection groove, thus avoiding the phenomenon of the circuit board being crushed and damaged during pressing, and further improving its practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall external structure of the device of the present utility model;

[0024] Figure 2Schematic diagram of the overall sectional structure of the device of the present utility model;

[0025] Figure 3 Schematic diagram of the side structure of the filling plate and the circuit board body of the present utility model;

[0026] Figure 4 Schematic diagram of the internal structure of the through hole of the present utility model;

[0027] Figure 5 For the present utility model Figure 2 Schematic diagram of the structure at position A in the present utility model.

[0028] In the attached drawings, the list of components represented by each reference numeral is as follows:

[0029] 1. Circuit board assembly; 101. Circuit board body; 102. Filling plate; 1021. Adhesive layer; 103. Through hole; 104. Partition sliding groove; 105. Buried hole; 106. Fixing hole; 107. Fixing rod; 108. Barbs; 109. Fixing nail;

[0030] 2. Fastening assembly; 201. Through hole tube; 202. Connecting groove; 203. Mesh rib; 204. Docking tube; 205. Fastening screw. Detailed implementation manners

[0031] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model. Embodiment 1

[0032] Please refer to Figures 1-5 As shown, the printed circuit board with double buried holes proposed in this embodiment includes a circuit board assembly 1 and a fastening assembly 2. The circuit board assembly 1 includes a circuit board body 101. A filling plate 102 is fixed on the side of the circuit board body 101. A through hole 103 is opened on the filling plate 102. At the same time, a buried hole 105 is opened in the circuit board body 101. The circuit board body 101 is composed of multiple layers of printed circuit boards, and a filling plate 102 is installed between each layer of printed circuit boards. The filling plate 102 enables the electrical connection inside the multiple layers of printed circuit boards to be more reliable and stable by connecting different-level circuit paths. At the same time, it can help conduct heat inside the circuit board body 101, and the filling plate 102 can also enhance the overall mechanical strength and stability of the circuit board body 101. At the same time, it can be used to control the impedance of the signal transmission line and reduce the influence of electromagnetic interference;

[0033] The fastening assembly 2 includes a through-hole tube 201 fixed in the through-hole 103. A connection groove 202 is provided in the through-hole tube 201. A docking tube 204 is movably connected in the connection groove 202. A fastening screw 205 is threadedly connected in the docking tube 204. The diameter of the side part of the through-hole tube 201 matches the diameter in the through-hole 103, and both ends of the through-hole tube 201 are in an annular shape that opens outward and fits on the outermost circuit board, ensuring the stability of the multi-layer circuit board during pressing. When installing the circuit board body 101, the fastening screw 205 passes through the through-hole tube 201, and in a rotating state, the circuit board is fixed at the corresponding position in the housing. At the same time, in a continuously rotating state, the docking tube 204 gradually moves deeper into the connection groove 202, improving the fixing of the overall installation of the circuit board assembly 1.

[0034] The working principle of the double-buried via printed circuit board proposed in this embodiment is as follows: There is a circuit board body 101 provided, and a filling plate 102 is bonded to the side of each circuit board body to achieve the assembly of single-layer circuit boards. Multiple single-layer circuit boards are stacked, so that the fixing rod 107 is inserted into the fixing holes 106 opened in the upper and lower corresponding filling plates 102, and is clamped on the inner wall of the fixing hole 106 by the provided barbs 108. At the same time, a plurality of fixing nails 109 are installed in the through-hole 103, and both ends of the fixing nails 109 are fixed on the corresponding layer of the circuit board body 101 and the filling plate 102. Then, a through-hole tube 201 is installed in the through-hole 103. By inserting the fastening screw 205 into the through-hole tube 201 and in a rotating state, the bottom end of the fastening screw 205 drills into the housing at the fixed position. At the same time, in a continuously rotating state, the docking tube 204 gradually moves deeper into the connection groove 202. Embodiment 2

[0035] Please refer to Figures 1-5 As shown, for the double-buried via printed circuit board proposed in this embodiment, on the basis of Embodiment 1, this embodiment further includes that a partition sliding groove 104 is opened on the filling plate 102, a fixing hole 106 is opened on the filling plate 102, a fixing rod 107 is inserted into the fixing hole 106, barbs 108 are provided at both ends of the fixing rod 107, the barbs 108 are clamped in the fixing hole 106, an adhesive layer 1021 is provided in the filling plate 102, the adhesive layer 1021 is bonded to the side of the circuit board body 101, a plurality of fixing nails 109 are provided in the through-hole 103, the fixing nails 109 are fixed on the multi-layer circuit board body 101 and the filling plate 102, and grid ridges 203 are provided in the connection groove 202, and the grid ridges 203 are attached to the side of the docking tube 204.

[0036] In this solution, the separation chute 104 is located between the circuit board body 101 and the through hole 103 included in the filling plate 102, playing a role of division, so that when installing, the edges of the circuit board body 101 and the filling plate 102 can be effectively distinguished, avoiding damage to the circuit board body 101 when installing the perforation. Fixed holes 106 are provided at the upper and lower corresponding positions on the edge of the filling plate 102. When multiple filling plates 102 are stacked, the fixed holes 106 provided in adjacent filling plates 102 correspond to each other, and the corresponding fixed holes 106 are fixed by fixing rods 107. The barbs 108 are closely attached to the inner wall of the fixed holes 106, increasing the stability between adjacent filling plates 102. The filling plate 102 wraps around the side of the circuit board body 101, and the inner side of the filling plate 102 and the side of the circuit board body 101 are adhesively fixed through the adhesive layer 1021, avoiding the circuit board body 101 from detaching from the filling plate 102. The fixing nail 109 is in a U shape, and the two ends are respectively fixed between the corresponding filling plate 102 and the internal circuit board body 101, enhancing the fixity between the circuit board body 101 and the filling plate 102, avoiding the circuit board body 101 from detaching from the filling plate 102. The docking pipe 204 is closely attached to the side of the grid rib 203, increasing the stability between the side of the docking pipe 204 and the inner wall of the connecting groove 202. When the fastening screw 205 rotates to fix the circuit board assembly 1, in case of excessive rotation, the docking pipe 204 gradually moves deeper into the connecting groove 202, avoiding the fastening screw 205 from directly pressing the circuit board assembly 1 and causing damage to the circuit board.

[0037] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A printed circuit board with double buried vias, comprising a circuit board assembly and a fastening assembly, characterized in that: The circuit board assembly comprises a circuit board body, a filling plate is fixed to the side of the circuit board body, a through hole is opened on the filling plate, and a buried hole is opened in the circuit board body; The fastening assembly comprises a through-hole tube fixed in the through-hole, a connecting groove is arranged in the through-hole tube, a butt-joint tube is movably connected in the connecting groove, and a fastening screw is threadedly connected in the butt-joint tube.

2. A printed circuit board with double buried vias according to claim 1, characterized in that: The filling plate is provided with a separation chute.

3. A printed circuit board with double buried vias according to claim 2, characterized in that: The filling plate is provided with a fixing hole, and a fixing rod is inserted into the fixing hole.

4. A printed circuit board with double buried vias according to claim 3, characterized in that: Both ends of the fixing rod are provided with barbs, which are clamped in the fixing holes.

5. A printed circuit board with double buried vias according to claim 3, characterized in that: An adhesive layer is arranged in the filling plate, and the adhesive layer is adhered to the side of the circuit board body.

6. A printed circuit board with double buried vias according to claim 1, characterized in that: A plurality of fixing pins are arranged in the through holes, and the fixing pins are fixed on the multi-layer circuit board body and the filling plate.

7. A printed circuit board with double buried vias according to claim 1, characterized in that: The connection groove is provided with a grid convex strip, and the grid convex strip is attached to the side of the butt pipe.

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