A flexible circuit board

Abstract

The application provides a flexible circuit board, which comprises a flexible circuit board body and a first zero-ohm resistor. The flexible circuit board body is provided with a first circuit layer and a second circuit layer, and the first circuit layer and the second circuit layer are both on the front surface of the flexible circuit board body. The first zero-ohm resistor is electrically connected to the first circuit layer and the second circuit layer of the flexible circuit board body. The first zero-ohm resistor is provided with a first solder pad and a second solder pad, the first solder pad is electrically connected to the first circuit layer, and the second solder pad is electrically connected to the second circuit layer, so that the first circuit layer and the second circuit layer are electrically connected through the first zero-ohm resistor. The electrical connection of two lines can be realized by welding the first zero-ohm resistor on the surface of a single-sided board, and mechanical drilling and chemical copper plating in the vertical direction are not needed, so that the double-sided board can be changed into a single-sided board design, the drilling and copper plating processes are omitted, the processing difficulty of the flexible circuit board is reduced, meanwhile, the thickness of the flexible circuit board is reduced, and the cost is reduced.

Description

Technical Field

[0001] This utility model relates to the technical field of flexible circuit boards, and more particularly to a flexible circuit board. Background Technology

[0002] With the development of technology, flexible circuit boards (PCBs) have emerged by embedding circuit designs into thin, flexible plastic sheets, allowing a large number of precision components to be packed into narrow and limited spaces, thus forming flexible circuits. In existing technologies, flexible circuit boards consist of a main body with a first circuit layer and a second circuit layer on its two surfaces. The traces of the first and second circuit layers are electrically connected through mechanical drilling and chemical copper plating. However, misalignment or deformation can easily occur during drilling, making the processing of existing flexible circuit boards quite difficult. Utility Model Content

[0003] The purpose of this utility model is to provide a flexible circuit board. The flexible circuit board body has a first circuit layer and a second circuit layer, both of which are located on the front side of the flexible circuit board body and on the same surface. The flexible circuit board body serves as a single-sided board. A first zero-ohm resistor electrically connects the first and second circuit layers of the flexible circuit board body. The first zero-ohm resistor has a first pad and a second pad, with the first pad electrically connected to the first circuit layer and the second pad electrically connected to the second circuit layer, so that the first and second circuit layers are electrically connected through the first zero-ohm resistor. The flexible circuit board body also has a third circuit layer, which passes through the space between the first and second circuit layers and is spaced apart from the first zero-ohm resistor. This allows for the electrical connection of two traces by soldering them onto the surface of the single-sided board through the first zero-ohm resistor, eliminating the need for vertical mechanical drilling and chemical copper plating. This facilitates the conversion of double-sided boards to single-sided boards, saving drilling and copper plating processes, reducing the processing difficulty of the flexible circuit board, and simultaneously reducing the thickness and cost of the flexible circuit board.

[0004] To achieve the above objectives, this utility model provides the following technical solution:

[0005] A flexible circuit board, comprising:

[0006] The flexible circuit board body has a first circuit layer and a second circuit layer, both of which are located on the front side of the flexible circuit board body and on the same surface; the flexible circuit board body is a single-sided board.

[0007] A first zero-ohm resistor is electrically connected to the first circuit layer and the second circuit layer of the flexible circuit board body. The first zero-ohm resistor is provided with a first pad and a second pad. The first pad is electrically connected to the first circuit layer, and the second pad is electrically connected to the second circuit layer, so that the first circuit layer and the second circuit layer are electrically connected through the first zero-ohm resistor.

[0008] The flexible circuit board body is further provided with a third circuit layer, which passes through the space between the first circuit layer and the second circuit layer and is arranged at an interval from the first zero-ohm resistor.

[0009] Optionally, the first circuit layer and the second circuit layer are arranged at intervals on the front side of the flexible circuit board body.

[0010] An insulating spacer layer is provided between one end of the first circuit layer and one end of the second circuit layer;

[0011] The first zero-ohm resistor is located on the outside of the flexible circuit board body, the first pad is soldered to the first circuit layer, and the second pad is soldered to the second circuit layer; the first pad and the second pad are electrically connected based on the first zero-ohm resistor.

[0012] Optionally, the third circuit layer is perforated by an insulating spacer layer and is spaced apart from one end of the first circuit layer and one end of the second circuit layer, respectively; the portion of the third circuit layer opposite to the insulating spacer layer is stacked with the first zero-ohm resistor, and the first zero-ohm resistor and the third circuit layer do not contact each other.

[0013] Optionally, when the flexible circuit board body is a single-sided board, the flexible circuit board body includes a circuit surface, a pure adhesive surface, and a substrate surface; the circuit surface, the pure adhesive surface, and the substrate surface are stacked sequentially in the vertical direction; the circuit surface is provided with a first circuit layer, a second circuit layer, and a third circuit layer.

[0014] Optionally, the flexible circuit board body further includes a circuit protection film, which covers the surface of the circuit surface and covers the first circuit layer, the second circuit layer and the third circuit layer.

[0015] Optionally, the first pad passes through the circuit protection film and is soldered to the first circuit layer located below the circuit protection film.

[0016] Optionally, the second pad passes through the circuit protection film and is soldered to the second circuit layer located below the circuit protection film.

[0017] Optionally, there are multiple third circuit layers, which are arranged sequentially along the length of the flexible circuit board body.

[0018] Optionally, the flexible circuit board is further provided with a second zero-ohm resistor, and two adjacent third circuit layers are electrically connected through the second zero-ohm resistor.

[0019] Optionally, the two pads of the second zero-ohm resistor are respectively soldered to one end of two adjacent third circuit layers.

[0020] Compared with the prior art, the beneficial effects of this utility model are:

[0021] This utility model provides a flexible circuit board. The flexible circuit board body has a first circuit layer and a second circuit layer, both of which are located on the front side of the flexible circuit board body and on the same surface. The flexible circuit board body serves as a single-sided board. A first zero-ohm resistor electrically connects the first and second circuit layers of the flexible circuit board body. The first zero-ohm resistor has a first pad and a second pad, with the first pad electrically connected to the first circuit layer and the second pad electrically connected to the second circuit layer, so that the first and second circuit layers are electrically connected through the first zero-ohm resistor. The flexible circuit board body also has a third circuit layer, which passes through the space between the first and second circuit layers and is spaced apart from the first zero-ohm resistor. This allows for the electrical connection of two traces by soldering them onto the surface of the single-sided board through the first zero-ohm resistor, eliminating the need for vertical mechanical drilling and chemical copper plating. This facilitates the conversion of double-sided boards to single-sided boards, saving drilling and copper plating processes, reducing the processing difficulty of the flexible circuit board, and simultaneously reducing the thickness and cost of the flexible circuit board. Attached Figure Description

[0022] Figure 1 A schematic diagram of the flexible circuit board of this utility model is shown.

[0023] Figure 2 It shows Figure 1 A magnified view of a portion of point A in the middle.

[0024] Figure 3 A bottom view of the flexible circuit board of this invention is shown.

[0025] Figure 4 A schematic diagram showing the connection between the first circuit layer and the second circuit layer of the flexible circuit board of this invention is shown.

[0026] Figure 5 A schematic diagram showing the connection between two adjacent third circuit layers of the flexible circuit board of this invention is shown.

[0027] Figure label:

[0028] 100. Flexible circuit board;

[0029] 10. Flexible circuit board body; 11. First circuit layer; 12. Second circuit layer; 13. Third circuit layer; 14. Circuit surface; 15. Pure adhesive; 16. Substrate surface; 17. Circuit protective film;

[0030] 20. First zero-ohm resistor; 21. First pad; 22. Second pad;

[0031] 30. Second zero-ohm resistor. Detailed Implementation

[0032] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0033] Please refer to the attached document. Figures 1-5 This application provides a flexible circuit board 100, which is used to form electrical connections of multiple traces on one side. The flexible circuit board 100 forms a flexible circuit by embedding circuit design on a bendable thin plastic sheet, which allows a large number of precision components to be stacked in a narrow and limited space.

[0034] Please refer to the attached document. Figures 1-5In this invention, the flexible circuit board 100 includes a flexible circuit board body 10 and a first zero-ohm resistor 20. The flexible circuit board body 10 has a first circuit layer 11 and a second circuit layer 12, both of which are located on the front side of the flexible circuit board body 10 and on the same surface. The flexible circuit board body 10 serves as a single-sided board. The first zero-ohm resistor 20 is electrically connected to the first circuit layer 11 and the second circuit layer 12 of the flexible circuit board body 10. The first zero-ohm resistor 20 has a first pad 21 and a second pad 22, where the first pad 21 is electrically connected to the first circuit layer 11 and the second pad 22 is electrically connected to the second circuit layer 12. The first circuit layer 11 and the second circuit layer 12 are electrically connected through the first zero-ohm resistor 20. The flexible circuit board body 10 is also provided with a third circuit layer 13, which passes through the space between the first circuit layer 11 and the second circuit layer 12 and is spaced apart from the first zero-ohm resistor 20. This allows the two traces to be electrically connected by soldering them to the surface of the single-sided board through the first zero-ohm resistor 20. This eliminates the need for vertical mechanical drilling and chemical copper plating, making it easier to convert a double-sided board to a single-sided board design. This eliminates drilling and copper plating processes, reduces the processing difficulty of the flexible circuit board 100, and also reduces the thickness of the flexible circuit board 100, thus reducing costs.

[0035] Please refer to the attached document. Figures 1-5 In this invention, the flexible circuit board body 10 is provided with a first circuit layer 11 and a second circuit layer 12. Both the first circuit layer 11 and the second circuit layer 12 are located on the front side of the flexible circuit board body 10 and are on the same surface. The flexible circuit board body 10 is a single-sided board, which facilitates the conversion of double-sided boards to single-sided boards, reduces the thickness of the flexible circuit board 100, and reduces costs. It also reduces stress concentration when the flexible circuit board body 10 is bent, improves the bending resistance of the flexible circuit board body 10, and is suitable for high-frequency bending scenarios.

[0036] The first zero-ohm resistor 20 electrically connects the first circuit layer 11 and the second circuit layer 12 of the flexible circuit board body 10. The first zero-ohm resistor 20 is provided with a first pad 21 and a second pad 22. The first pad 21 is electrically connected to the first circuit layer 11, and the second pad 22 is electrically connected to the second circuit layer 12, so that the first circuit layer 11 and the second circuit layer 12 are electrically connected through the first zero-ohm resistor 20. This allows the electrical connection of the two traces to be achieved by soldering the first zero-ohm resistor 20 onto the surface of the single board, eliminating the need for vertical mechanical drilling and chemical copper plating, thus saving drilling and copper plating processes and reducing the processing difficulty of the flexible circuit board 100.

[0037] The flexible circuit board body 10 also includes a third circuit layer 13, which passes through the space between the first circuit layer 11 and the second circuit layer 12 and is spaced apart from the first zero-ohm resistor 20. This allows the third circuit layer 13, the first circuit layer 11, and the second circuit layer 12 to be integrated onto the same surface of the flexible circuit board body 10, thereby facilitating the integration of multiple circuits into the flexible circuit board body 10. Single-layer circuitry is easier to inspect visually or perform electrical tests, resulting in lower fault location and repair costs.

[0038] Please refer to the attached document. Figures 1-4 In this invention, the first circuit layer 11 and the second circuit layer 12 are arranged at intervals on the front side of the flexible circuit board body 10 to maintain a certain distance between them. An insulating spacer layer is provided between one end of the first circuit layer 11 and one end of the second circuit layer 12 to ensure physical and electrical isolation between them, preventing short circuits. A first zero-ohm resistor 20 is located on the outside of the flexible circuit board body 10. A first pad 21 is soldered to the first circuit layer 11, and a second pad 22 is soldered to the second circuit layer 12. The first pad 21 and the second pad 22 are electrically connected based on the first zero-ohm resistor 20, allowing the first circuit layer 11 and the second circuit layer 12 to be electrically connected through the first pad 21 and the second pad 22.

[0039] Please refer to the attached document. Figures 1-5 In this invention, the third circuit layer 13 is provided with an insulating spacer layer and is spaced apart from one end of the first circuit layer 11 and one end of the second circuit layer 12, respectively. The portion of the third circuit layer 13 relative to the insulating spacer layer is stacked with the first zero-ohm resistor 20. The first zero-ohm resistor 20 and the third circuit layer 13 do not contact each other, saving lateral space so that the third circuit layer 13 is not electrically connected to the first circuit layer 11 and the second circuit layer 12. The third circuit layer 13 has no contact with the zero-ohm resistor, achieving complete isolation. This facilitates the independent operation of the third circuit layer 13 and realizes a high-density, multi-functional, and anti-interference three-dimensional flexible circuit layout.

[0040] Please refer to the attached document. Figures 1-3 In this utility model, when the flexible circuit board body 10 is a single-sided board, the flexible circuit board body 10 includes a circuit surface 14, a pure adhesive 15, and a substrate surface 16; the circuit surface 14, the pure adhesive 15, and the substrate surface 16 are stacked sequentially in the vertical direction; the circuit surface 14 is provided with a first circuit layer 11, a second circuit layer 12, and a third circuit layer 13, so that the first circuit layer 11, the second circuit layer 12, and the third circuit layer 13 act on the same circuit surface 14, thereby facilitating the circuit surface 14 to achieve electrical isolation without vertical mechanical drilling and chemical copper plating.

[0041] Please refer to the attached document. Figures 1-3In this utility model, the flexible circuit board body 10 also includes a circuit protection film 17, which covers the surface of the circuit surface 14 and covers the first circuit layer 11, the second circuit layer 12 and the third circuit layer 13, so that the circuit protection film 17 can protect the first circuit layer 11, the second circuit layer 12 and the third circuit layer 13 and prevent the first circuit layer 11, the second circuit layer 12 and the third circuit layer 13 from short circuit.

[0042] Please refer to the attached document. Figures 1-3 In this utility model, the first pad 21 is provided with a circuit protection film 17 and is soldered to the first circuit layer 11 located on the lower side of the circuit protection film 17, so that the first pad 21 extends from the circuit protection film 17 to the first circuit layer 11, thereby facilitating the first pad 21 and the first circuit layer 11 to be in an electrical connection state.

[0043] Please refer to the attached document. Figures 1-3 In this utility model, the second pad 22 is provided with a circuit protection film 17 and is soldered to the second circuit layer 12 located below the circuit protection film 17, so that the second pad 22 extends from the circuit protection film 17 to the second circuit layer 12, thereby facilitating the electrical connection between the second pad 22 and the second circuit layer 12.

[0044] Please refer to the attached document. Figure 1 and 5 In this utility model, there are multiple third circuit layers 13, which are arranged sequentially along the length of the flexible circuit board body 10, further increasing the number of circuits in the flexible circuit board body 10.

[0045] Please refer to the attached document. Figure 1 and 5 In this utility model, the flexible circuit board 100 is also provided with a second zero-ohm resistor 30. The two adjacent third circuit layers 13 are electrically connected through the second zero-ohm resistor 30, so that the two adjacent third circuit layers 13 can be electrically connected by soldering the second zero-ohm resistor 30 to the surface of the single board, without the need for vertical mechanical drilling and chemical copper plating.

[0046] Please refer to the attached document. Figure 1 and 5 In this invention, the two pads of the second zero-ohm resistor 30 are respectively soldered to one end of two adjacent third circuit layers 13, so that the two adjacent third circuit layers 13 can be electrically connected through the two pads of the second zero-ohm resistor 30.

[0047] Compared with the prior art, the beneficial effects of this utility model are:

[0048] This utility model provides a flexible circuit board 100. The flexible circuit board body 10 has a first circuit layer 11 and a second circuit layer 12. The first circuit layer 11 and the second circuit layer 12 are both located on the front side of the flexible circuit board body 10 and are on the same surface. The flexible circuit board body 10 is a single-sided board. A first zero-ohm resistor 20 is electrically connected to the first circuit layer 11 and the second circuit layer 12 of the flexible circuit board body 10. The first zero-ohm resistor 20 has a first pad 21 and a second pad 22. The first pad 21 is electrically connected to the first circuit layer 11, and the second pad 22 is electrically connected to the second circuit layer 12, so that the first circuit layer 11 and the second circuit layer 12 are connected to each other. The second circuit layer 12 is electrically connected through the first zero-ohm resistor 20; the flexible circuit board body 10 is also provided with a third circuit layer 13, which passes through the space between the first circuit layer 11 and the second circuit layer 12 and is spaced apart from the first zero-ohm resistor 20, so that the two traces can be electrically connected by soldering to the surface of the single board through the first zero-ohm resistor 20, without the need for vertical mechanical drilling and chemical copper plating, thus facilitating the conversion of double-sided boards to single-sided boards, saving drilling, copper plating and other processes, reducing the processing difficulty of the flexible circuit board 100, and at the same time reducing the thickness of the flexible circuit board 100 and reducing costs.

[0049] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A flexible circuit board, characterized in that, include: The flexible circuit board body has a first circuit layer and a second circuit layer, both of which are located on the front side of the flexible circuit board body and on the same surface; the flexible circuit board body is a single-sided board. A first zero-ohm resistor is electrically connected to the first circuit layer and the second circuit layer of the flexible circuit board body. The first zero-ohm resistor is provided with a first pad and a second pad. The first pad is electrically connected to the first circuit layer, and the second pad is electrically connected to the second circuit layer, so that the first circuit layer and the second circuit layer are electrically connected through the first zero-ohm resistor. The flexible circuit board body is further provided with a third circuit layer, which passes through the space between the first circuit layer and the second circuit layer and is arranged at an interval from the first zero-ohm resistor.

2. The flexible circuit board according to claim 1, characterized in that, The first circuit layer and the second circuit layer are arranged at intervals on the front side of the flexible circuit board body; An insulating spacer layer is provided between one end of the first circuit layer and one end of the second circuit layer; The first zero-ohm resistor is located on the outside of the flexible circuit board body, the first pad is soldered to the first circuit layer, and the second pad is soldered to the second circuit layer; the first pad and the second pad are electrically connected based on the first zero-ohm resistor.

3. The flexible circuit board according to claim 2, characterized in that, The third circuit layer is perforated by an insulating spacer layer and is spaced apart from one end of the first circuit layer and one end of the second circuit layer, respectively; the portion of the third circuit layer opposite to the insulating spacer layer is stacked with the first zero-ohm resistor, and the first zero-ohm resistor and the third circuit layer do not contact each other.

4. The flexible circuit board according to claim 1, characterized in that, When the flexible circuit board body is a single-sided board, the flexible circuit board body includes a circuit surface, a pure adhesive surface, and a substrate surface; the circuit surface, the pure adhesive surface, and the substrate surface are stacked sequentially in the vertical direction; the circuit surface is provided with a first circuit layer, a second circuit layer, and a third circuit layer.

5. The flexible circuit board according to claim 4, characterized in that, The flexible circuit board body also includes a circuit protection film, which covers the surface of the circuit surface and covers the first circuit layer, the second circuit layer and the third circuit layer.

6. The flexible circuit board according to claim 5, characterized in that, The first pad passes through the circuit protection film and is soldered to the first circuit layer located below the circuit protection film.

7. The flexible circuit board according to claim 6, characterized in that, The second pad passes through the circuit protection film and is soldered to the second circuit layer located below the circuit protection film.

8. The flexible circuit board according to claim 1, characterized in that, The third circuit layer has multiple layers, which are arranged sequentially along the length of the flexible circuit board body.

9. The flexible circuit board according to claim 8, characterized in that, The flexible circuit board is also provided with a second zero-ohm resistor, and two adjacent third circuit layers are electrically connected through the second zero-ohm resistor.

10. The flexible circuit board according to claim 9, characterized in that, The two pads of the second zero-ohm resistor are respectively soldered to one end of the two adjacent third circuit layers.

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