Flexible printed circuit (FPC) board connecting structure

Abstract

The utility model discloses an FPC flexible circuit board connection structure, the FPC flexible circuit board connection structure comprises a PCB and an FPC board, the FPC board is attached to one side of the PCB, one end of the FPC board extends out of the PCB along a first direction, the end, extending out of the PCB, of the FPC board is provided with a plug terminal, and the first direction is the same as the length direction of the FPC board; wherein the FPC board comprises a first insulating layer, a first conducting layer, a substrate, a second conducting layer and a second insulating layer which are sequentially arranged in a stacked mode, and the first insulating layer is located on the side, away from the PCB, of the second insulating layer; in the first direction, one edge of the first insulating layer is provided with a fixed gap and a first gap, and when the FPC board is not bent, the first gap is located at one side, far away from the plugging terminal, of the fixed gap; the fixed notch and the first notch are provided with soldering tin connected with the PCB, and the first conductive layer is electrically connected with the PCB through the soldering tin at the first notch. The structural strength of the position, easy to tear, of the FPC board is improved, and the FPC board can be prevented from being torn in the inserting process.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of flexible circuit board, in particular to a FPC flexible circuit board connecting structure. BACKGROUND

[0002] FPC (Flexible Printed Circuit), Chinese name is flexible circuit board, is made of polyimide or polyester film as the base material of a highly reliable, excellent flexible printed circuit board. With the characteristics of high wiring density, light weight, thin thickness, good bending. PCB (Printed Circuit Board), Chinese name is printed circuit board, also known as printed wiring board, is an important electronic component, is the support of electronic components, is the carrier of electrical interconnection of electronic components.

[0003] In some FPC board and PCB board connecting structure, a notch is provided at the edge of the FPC board, the FPC board and the PCB board are connected through soldering at the notch, the end of the FPC board away from the PCB board is connected with the rest of the electrical structure by plugging, in the process of plugging the FPC board, the two layer insulating layers of the FPC board have notches, which is easy to cause tearing at the notch, and is inconvenient to use. CONTENT OF THE INVENTION

[0004] The main purpose of the present application is to provide a FPC flexible circuit board connecting structure, which aims to solve the problem that the position of the FPC board and the PCB board connected by soldering is easy to tear and inconvenient to use.

[0005] In order to achieve the above purpose, the present application provides a FPC flexible circuit board connecting structure, which comprises a PCB board and a FPC board, the FPC board is attached to one side of the PCB board and one end extends out of the PCB board along a first direction, the end of the FPC board extending out of the PCB board is provided with a plugging terminal, and the first direction is the same as the length direction of the FPC board; wherein the FPC board comprises a first insulating layer, a first conductive layer, a substrate, a second conductive layer and a second insulating layer connected in turn, and the first insulating layer is located on the side of the second insulating layer away from the PCB board; a fixed notch and a first notch are provided on the edge of the first insulating layer parallel to the first direction, and when the FPC board is not bent, the first notch is located on the side of the fixed notch away from the plugging terminal; soldering connecting with the PCB board is provided at the fixed notch and the first notch; and the first conductive layer is electrically connected with the PCB board through the soldering at the first notch.

[0006] Optionally, the first notch has a plurality of first notches; and when the FPC board is not bent, each of the first notches is located on the side of the fixed notch away from the plugging terminal.

[0007] Optionally, the first conductive layer bypasses the outer periphery of the fixed notch.

[0008] Optionally, a substrate notch is formed on the substrate and is opposite to the first notch in a second direction, the second direction being the same as the thickness direction of the PCB board; a second notch is formed on the second insulating layer and is opposite to the first notch in the second direction.

[0009] Optionally, the second conductive layer bypasses the outer periphery of the substrate notch.

[0010] Optionally, the FPC soft wire board connecting structure further comprises a tear-resistant line, the tear-resistant line being arranged on the second conductive layer; wherein the tear-resistant line bypasses the outer periphery of the fixed notch.

[0011] Optionally, the tear-resistant line is arranged along the edge of the substrate.

[0012] Optionally, the circuit on the second conductive layer is a copper mesh.

[0013] Optionally, the edges of the fixed notch, the first notch, the substrate notch and the second notch are all arc-shaped.

[0014] Optionally, the tear-resistant line is a metal material.

[0015] The FPC soft wire board connecting structure provided in the embodiments of the present application increases a fixed notch on the first insulating layer for fixing the FPC board and the PCB board by soldering, the first notch is used for electrically connecting the first conductive layer and the PCB board by soldering, and when the FPC board is not bent, the first notch is located on the side of the fixed notch away from the plug-in terminal; thus, when the FPC board is plugged in by the plug-in terminal, the position most easily subjected to force is the position of the fixed notch, only the first insulating layer is provided with the fixed notch at this position, and the second insulating layer is in a complete state, so that the structural strength of the position easily torn by the FPC board is improved, and the FPC board can be prevented from being torn in the plugging process. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the prior art and the present application, the drawings needed in the description of the prior art and the embodiments of the present application will be briefly introduced. Obviously, the drawings in the following description are only exemplary, and other drawings can be derived from the provided drawings without creative labor for those skilled in the art.

[0017] The structures, proportions, sizes, etc. shown in the specification are merely used to cooperate with the content disclosed in the specification, so that those skilled in the art can understand and read, and are not used to limit the implementation conditions of the utility model. Any modification of the structure, change of the proportional relationship, or adjustment of the size, without affecting the functions and purposes that can be achieved by the utility model, should still fall within the scope of the technical content disclosed by the utility model.

[0018] Figure 1 The overall structure schematic diagram of the FPC plate provided by the embodiment of the application is shown in the figure.

[0019] Figure 2 The overall structure schematic diagram of the FPC flexible wire plate connection structure provided by the embodiment of the application is shown in the figure.

[0020] Figure 3 The FPC plate hierarchical structure schematic diagram provided by the embodiment of the application is shown in the figure.

[0021] Figure 4 The structure schematic diagram of the tear-resistant line of the FPC plate provided by the embodiment of the application is shown in the figure.

[0022] Figure 5 The copper mesh structure schematic diagram of the FPC plate provided by the embodiment of the application is shown in the figure.

[0023] In the figure: 1, PCB plate; 2, FPC plate; 21, first insulating layer; 211, fixed notch; 212, first notch; 22, first conductive layer; 23, substrate; 231, substrate notch; 24, second conductive layer; 25, second insulating layer; 251, second notch; 3, tear-resistant line.

[0024] The implementation, functional features and advantages of the application will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0026] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the utility model are only used to explain the relative positional relationship, movement condition, etc. between the components in a certain posture (as shown in the drawings), and the directional indications will change accordingly if the certain posture changes.

[0027] In the utility model, unless another definite provision and limitation, the term "connect" "fix" and so on should do the broad sense understanding, for example, "fix" can be fixed connection, also can be detachable connection, or become an integral whole, can be mechanical connection, also can be electric connection, can be direct connection, also can through the indirect connection of intermediate medium, can be the communication or the interaction of two elements of two elements inside, unless another definite limitation. For ordinary skilled person in the art, can understand the specific meaning of the above terms in the utility model according to specific circumstances.

[0028] In addition, if the description of "first" "second" and the like is involved in the embodiments of the utility model, the description of "first" "second" and the like is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first" "second" can explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing throughout the text includes three parallel schemes. For example, "A and / or B" includes A scheme, or B scheme, or A and B simultaneously satisfy the scheme. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on that the ordinary skilled person in the art can realize, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, and is not within the protection scope required by the utility model.

[0029] The present application will be described in detail below with reference to the drawings and embodiments.

[0030] Figure 1 The overall structure schematic diagram of FPC board provided for the embodiments of the present application is shown in the figure. Figure 2 The overall structure schematic diagram of FPC soft wire board connecting structure provided for the embodiments of the present application is shown in the figure. Figure 3 The FPC board hierarchical structure schematic diagram provided for the embodiments of the present application is shown in the figure. Figure 4 The structure schematic diagram of the tear-resistant line of FPC board provided for the embodiments of the present application is shown in the figure. Figure 5 The structure schematic diagram of the copper mesh of FPC board provided for the embodiments of the present application is shown in the figure.

[0031] Reference Figures 1-5The embodiment of the application provides a FPC soft wire board connecting structure, which can include a PCB board 1 and a FPC board 2, the FPC board 2 is attached to one side of the PCB board 1 and one end extends out of the PCB board 1 along a first direction, the end of the FPC board 2 extending out of the PCB board 1 is provided with a plug-in terminal, and the first direction is the same as the length direction of the FPC board 2; wherein the FPC board 2 can include a first insulating layer 21, a first conductive layer 22, a substrate 23, a second conductive layer 24 and a second insulating layer 25 which are sequentially stacked, and the first insulating layer 21 is located on the side of the second insulating layer 25 away from the PCB board 1; in the first direction, a fixed notch 211 and a first notch 212 are arranged on one edge of the first insulating layer 21, and when the FPC board 2 is not bent, the first notch 212 is located on the side of the fixed notch 211 away from the plug-in terminal; the fixed notch 211 and the first notch 212 are both provided with soldering tin connected with the PCB board 1, and the first conductive layer 22 is electrically connected with the PCB board 1 through the soldering tin at the first notch 212.

[0032] The FPC soft wire board connecting structure provided by the embodiment of the application adds a fixed notch 211 on the first insulating layer 21 for fixing the FPC board 2 and the PCB board 1 through soldering tin, and a first notch 212 is used for electrically connecting the first conductive layer 22 and the PCB board 1 through soldering tin, and when the FPC board 2 is not bent, the first notch 212 is located on the side of the fixed notch 211 away from the plug-in terminal; thus when the FPC board 2 is plugged through the plug-in terminal, the position most easily subjected to force is the position of the fixed notch 211, only the fixed notch 211 is arranged on the first insulating layer 21, and the second insulating layer 25 is in a complete state, so that the structural strength of the position of the FPC board 2 easily subjected to tearing is improved, and the FPC board 2 can be prevented from being torn in the plugging process.

[0033] It should be understood that the first direction is the X direction, the second direction is the Y direction, the FPC board 2 in the application is a double-sided FPC, so that the FPC board 2 is mainly subjected to force by the first insulating layer 21 and the second insulating layer 25, and only the fixed notch 211 is arranged on the first insulating layer 21 in the application, so that the structural strength of the position of the FPC board 2 easily subjected to tearing is effectively improved.

[0034] wherein, Figure 2 In the figure, the black square covering the fixed notch 211 and the first notch 212 represents soldering tin, and it can be known that the first conductive layer 22 is electrically connected with the PCB board 1 through the soldering tin at the first notch 212.

[0035] Reference Figure 1 In the example embodiment, the first notch 212 has a plurality of first notches 212; and when the FPC board 2 is not bent, each first notch 212 is located on the side of the fixed notch 211 away from the plug-in terminal.

[0036] like Figure 1 As shown, there can be two first notches 212, both of which are located on the side of the fixed notch 211 away from the plug-in terminal. When the FPC board 2 is connected to the PCB board 1, the FPC board 2 has a plug-in end and a fixed end. The plug-in end can be bent for plugging operation, and the fixed end is connected to the PCB board 1. The fixed notch 211 is located at the junction of the plug-in end and the fixed end. Therefore, the fixed notch 211 is the most likely to tear, which keeps the second insulating layer 25 intact at this location and can effectively improve the structural strength of the FPC board 2 at the fixed notch 211.

[0037] refer to Figure 1 In an exemplary embodiment, the first conductive layer 22 is separated from the fixing notch 211, that is, the circuit on the first conductive layer 22 bypasses the fixing notch 211, ensuring that the solder at the fixing notch 211 will not contact the circuit in the first conductive layer 22.

[0038] refer to Figure 3 In an exemplary embodiment, a substrate notch 231 is formed on the substrate 23, which is opposite to the first notch 212 in a second direction, and the second direction is the same as the thickness direction of the PCB board 1; a second notch 251 is formed on the second insulating layer 25, which is opposite to the first notch 212 in a second direction.

[0039] like Figure 3 As shown, when soldering is performed at the first notch 212, the solder will flow to the substrate notch 231 and the second notch 251. This increases the contact area between the solder and the FPC board 2 and the PCB board 1, making the connection tighter and thus improving the stability of the connection between the FPC board 2 and the PCB board 1.

[0040] refer to Figure 3 and Figure 5 In an exemplary embodiment, the second conductive layer 24 is separated from the substrate notch 231, that is, the circuit on the second conductive layer 24 bypasses the first notch 212, ensuring that the solder at the first notch 212 will not contact the circuit in the second conductive layer 24.

[0041] Among them, such as Figure 5 The circuit on the second conductive layer 24 shown is a copper mesh. The copper mesh can effectively absorb and reflect external electromagnetic waves, reducing the impact of external electromagnetic interference on the circuit. In addition, the copper mesh can prevent electromagnetic waves generated by the internal circuit from radiating outward, reducing interference to other electronic devices.

[0042] Furthermore, the edges of the fixed notch 211, the first notch 212, the substrate notch 231, and the second notch 251 are all arc-shaped, so that the solder flows more evenly when it flows, and it is easier to process the arc-shaped notches.

[0043] Reference Figures 1-4 In the example embodiment, the FPC soft wire board connecting structure can further comprise a tear-proof line 3 arranged on the second conductive layer 24; wherein a normal projection of the tear-proof line 3 on the substrate 23 is a first projection, a normal projection of the fixed notch 211 on the substrate 23 is a second projection, and the first projection partially overlaps the second projection.

[0044] If the first projection partially overlaps the second projection, when the fixed notch 211 is stressed, the tear-proof line first bears the load, further increasing the structural strength at the fixed notch 211 to prevent tearing at the fixed notch 211.

[0045] Wherein, the first projection partially overlapping the second projection can be understood as the first projection passing through the second projection along a first direction.

[0046] Of course, the first projection can also be located at the outer periphery of the second projection, so that when a slight tear occurs at the fixed notch 211, the tear-proof line 3 can prevent the FPC board from further tearing.

[0047] Further, the tear-proof line 3 can be arranged along the edge of the substrate 23 in a ring shape; the circuit on the first conductive layer 22 and the copper mesh are located at the inner periphery of the tear-proof line 3, thereby effectively preventing the circuit or copper mesh on the first conductive layer 22 from being damaged due to tearing.

[0048] It should be understood that the circuit on the first conductive layer 22 being located at the inner periphery of the tear-proof line 3 can be understood as the normal projection of the circuit on the first conductive layer 22 on the substrate 23 forming a first area, the normal projection of the tear-proof line 3 on the substrate 23 forming a second area, and the second area covering the first area; of course, if the circuit on the first conductive layer 22 is connected to the first notch, the first area is in contact with the substrate notch 231, and the contact area is located outside the second area.

[0049] Further, the tear-proof line 3 is a metal material, for example, can be copper.

[0050] The above is only the preferred embodiment of the present application, and does not limit the patent scope of the present application, and any equivalent structure or equivalent process transformation using the content of the specification and drawings, or direct or indirect application in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. An FPC flexible cord board connecting structure characterized by comprising: The application relates to a FPC soft wire board connecting structure. The application relates to a FPC soft wire board connecting structure. The FPC board (2) comprises a first insulating layer (21), a first conductive layer (22), a substrate (23), a second conductive layer (24) and a second insulating layer (25) which are sequentially stacked, the first insulating layer (21) is located on the side of the second insulating layer (25) which is away from the PCB board (1); In the first direction, a fixing notch (211) and a first notch (212) are arranged on one edge of the first insulating layer (21), when the FPC board (2) is not bent, the first notch (212) is located on the side of the fixing notch (211) which is away from the plug-in terminal; The fixing notch (211) and the first notch (212) are both provided with soldering tin which is connected with the PCB board (1), and the first conductive layer (22) is electrically connected with the PCB board (1) through the soldering tin at the first notch (212). The first notch (212) has a plurality of first notches (212).

2. The FPC ribbon cable board connecting structure according to claim 1, wherein, When the FPC board (2) is not bent, each first notch (212) is located on the side of the fixing notch (211) which is away from the plug-in terminal. The first conductive layer (22) is separated from the fixing notch (211).

3. The FPC ribbon cord board connecting structure according to claim 1, wherein The substrate (23) is provided with a substrate notch (231) which is opposite to the first notch (212) in the second direction, the second direction is the same as the thickness direction of the PCB board (1); 4. The FPC ribbon cable board connection structure according to claim 1, wherein, The second insulating layer (25) is provided with a second notch (251) which is opposite to the first notch (212) in the second direction. The second conductive layer (24) is separated from the substrate notch (231).

5. The FPC ribbon cord board connecting structure according to claim 4, wherein The FPC soft wire board connecting structure further comprises:

6. The FPC ribbon cable board connection structure according to claim 1, wherein, A tear-proof line (3) is arranged on the second conductive layer (24); The normal projection of the tear-proof line (3) on the substrate (23) is a first projection, the normal projection of the fixing notch (211) on the substrate (23) is a second projection, and the first projection and the second projection partially overlap. The tear-proof line (3) is arranged along the edge of the substrate (23).

7. The FPC ribbon cord board connecting structure according to claim 6, wherein The circuit on the second conductive layer (24) is copper mesh.

8. The FPC ribbon cable board connection structure according to Claim 1, wherein, The edges of the fixing notch (211), the first notch (212), the substrate notch (231) and the second notch (251) are all arc-shaped.

9. The FPC ribbon cord board connecting structure according to claim 4, wherein The tear-proof line (3) is made of metal material.

10. The FPC ribbon cord board connecting structure according to claim 6, wherein ​

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