Tear-resistant FPC circuit board

Abstract

The utility model provides an anti-tear FPC circuit board, relates to circuit board technical field, the anti-tear FPC circuit board includes circuit board body and first anti-tear block, circuit board body includes arc area, arc area can bend along the thickness direction of circuit board body, arc area includes inner arc area and outer arc area, first anti-tear block wraps the inner arc area. According to the FPC circuit board, the inner arc area on the circuit board body is wrapped by the first anti-tearing block, so that the structural strength of the inner arc area can be effectively improved, the structural stability of the inner arc area is ensured, the anti-tearing capability of the FPC circuit board is improved, and the use stability of the FPC circuit board is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of circuit boards, in particular to a tear-resistant FPC circuit board. Background Art

[0002] FPC (Flexible Printed Circuit) is a circuit board made of a flexible substrate. It is thin, bendable, and foldable, and is widely used in various electronic devices. FPC usually consists of a substrate, a conductive layer, a covering layer, and gold fingers. Among them, the substrate usually includes polyimide (PI) and polyester (PET) films. The conductive layer usually uses copper foil to form the conductive path of the circuit. The covering film is usually the same as the insulating film material, covering the copper foil, and plays an insulating, solder-resistant and protective role. The gold fingers are contact points on the FPC, which are used to connect with other electronic components.

[0003] In the patent document with the Chinese document publication number CN220528277U, a flexible circuit board and a terminal device are disclosed, wherein the flexible circuit board includes a circuit board body and a reinforcing sheet, the reinforcing sheet is arranged corresponding to the reinforcing area and connected to the circuit board body, and a notch is arranged on one side of the reinforcing sheet adjacent to the bending area to increase the contact area between the bending area and the reinforcing sheet.

[0004] The flexible circuit board disclosed in the appeal document can alleviate the stress concentration problem at the connection between the bending zone and the reinforcement zone by means of the reinforcement plates set in the corresponding reinforcement zones. However, when the flexible circuit board is twisted and bent at the edge of the reinforcement plates, the edge of the reinforcement plates will be subjected to force together with the circuit board body, causing the flexible circuit board to self-cut, resulting in the problem of tearing and damage to the circuit board body.

[0005] Therefore, it is necessary to improve the existing tear-resistant FPC circuit board to overcome the defects of the prior art. Utility Model Content

[0006] In order to overcome the problems existing in the related art, the purpose of the utility model is to provide a tear-resistant FPC circuit board to solve the problem of easy tearing damage in the prior art.

[0007] A tear-resistant FPC circuit board, comprising a circuit board body, wherein the circuit board body comprises an arc-shaped area, wherein the arc-shaped area can be bent along the thickness direction of the circuit board body, and wherein the arc-shaped area comprises an inner arc area and an outer arc area;

[0008] It also includes a first anti-tear block, which wraps the inner arc area.

[0009] By wrapping the inner arc area on the circuit board body with the first anti-tear block, the structural strength of the inner arc area can be effectively improved, the structural stability of the inner arc area can be ensured, and the tear resistance of the FPC circuit board can be improved, thereby improving the use stability of the FPC circuit board.

[0010] Preferably, it further comprises a second anti-tear block, wherein the second anti-tear block wraps the outer arc area.

[0011] The first anti-tear block protects the inner arc area, and the second anti-tear block protects the outer arc area, together forming comprehensive protection for the entire arc area, reducing the risk of tearing in any part during the bending process.

[0012] Preferably, the first anti-tear blocks are distributed along the circumference of the inner arc area, and the second anti-tear blocks are distributed along the circumference of the outer arc area;

[0013] The cross-sectional shapes of the first anti-tear block and the second anti-tear block are both U-shaped, and the edges of the first anti-tear block and the second anti-tear block are both provided with arc corners.

[0014] The U-shaped cross-section design increases the contact area between the tear-resistant block and the circuit board, provides stronger adhesion and support, effectively disperses stress and prevents tearing. The arc-shaped design of the tear-resistant block edge avoids stress concentration caused by sharp corners, prevents the tear-resistant block and the circuit board from self-cutting when bending, and reduces the risk of tearing at the edge during bending.

[0015] Preferably, the first anti-tear block and the second anti-tear block are both provided with grooves, and the grooves are distributed along the radial direction of the anti-tear blocks.

[0016] The presence of the groove makes the anti-tear block more flexible when bent, and can better adapt to the bending deformation of the FPC circuit board, avoiding stress concentration and tearing caused by the anti-tear block being too rigid.

[0017] Preferably, the first anti-tear block and the second anti-tear block in the same arc-shaped area are connected to form an anti-tear belt with an integrated structure.

[0018] The structural support and stress distribution advantages of the integrated tear-resistant tape, combined with the flexibility advantages of the groove design, make the FPC circuit board more reliable and durable when bent.

[0019] Preferably, the first anti-tear block and the second anti-tear block both include a base layer and a fiber mesh layer, the fiber mesh layer is arranged on the inner side of the base layer, and the inner side refers to a side of the base layer close to the circuit board body.

[0020] The mesh structure of the fiber mesh layer helps to disperse stress, prevent stress concentration at specific points, and further reduce the risk of tearing. The fiber material itself has a certain degree of flexibility and can better adapt to the bending deformation of the FPC circuit board.

[0021] Preferably, the first anti-tear block and the second anti-tear block both include a base layer and a copper mesh layer, the copper mesh layer is arranged on the inner side of the base layer, and the inner side refers to a side of the base layer close to the circuit board.

[0022] The copper mesh layer acts as an additional reinforcement structure to better resist tensile and tearing stresses, further improving tear resistance.

[0023] Preferably, a glue layer is further provided on the inner side of the fiber mesh layer, and the glue layer is glued and fixed to the circuit board body. The inner side refers to a side of the fiber mesh layer close to the circuit board body.

[0024] The addition of the glue layer significantly improves the bonding strength between the anti-tear block and the circuit board, enabling it to withstand stronger external forces and more frequent bending.

[0025] Preferably, a glue layer is further provided on the inner side of the copper mesh layer, and the glue layer is glued and fixed to the circuit board body. The inner side refers to a side of the copper mesh layer close to the circuit board body, and the copper mesh layer is obtained by lamination, exposure, development and etching.

[0026] The glue layer firmly bonds the copper mesh layer to the circuit board body, ensuring the connection strength and reliability between the anti-tear block and the circuit board, and preventing peeling or delamination between the copper mesh layer and the circuit board body.

[0027] The beneficial effects of the utility model are:

[0028] The utility model provides a tear-resistant FPC circuit board, which includes a circuit board body and a first tear-resistant block. The circuit board body includes an arc area, and the arc area can be bent along the thickness direction of the circuit board body. The arc area includes an inner arc area and an outer arc area. When the FPC circuit board is bent or twisted, the inner arc area on the circuit board body is bent. Since the circuit board body is cut from a whole plate, the edges are relatively weak, especially the inner arc area is most prone to tearing. By wrapping the inner arc area on the circuit board body with the first tear-resistant block, the structural strength of the inner arc area can be effectively improved, the structural stability of the inner arc area can be ensured, and the tear resistance of the FPC circuit board is improved, and the use stability of the FPC circuit board is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 is a schematic diagram of the tear-resistant FPC circuit board provided in Example 1 of the present application;

[0030] Figure 2 is a schematic diagram of the tear-resistant FPC circuit board provided in Example 2 of the present application;

[0031] Figure 3 is a schematic diagram of the tear-resistant tape provided in Example 2 of the present application;

[0032] Figure 4 is a cross-sectional view of the tear-resistant tape provided in Example 1 of the present application;

[0033] Figure 5 is a cross-sectional view of the tear-resistant tape provided in Example 2 of the present application;

[0034] Figure 6 is a layered cross-sectional view of the tear-resistant tape provided in Example 1 of the present application;

[0035] Figure 7 It is a layered cross-sectional view of the tear-resistant tape provided in Example 2 of the present application.

[0036] Reference numerals:

[0037] 100, circuit board body; 110, inner arc area; 120, outer arc area; 200, anti-tear tape; 210, first anti-tear block; 220, second anti-tear block; 300, groove; 400, base layer; 500, fiber mesh layer; 600, glue layer; 700, copper mesh layer. DETAILED DESCRIPTION

[0038] The preferred embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although the preferred embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to make the present invention more thorough and complete, and to fully convey the scope of the present invention to those skilled in the art. Example 1

[0039] like Figure 1-Figure 7 As shown, this embodiment provides a tear-resistant FPC circuit board, which includes a circuit board body 100, wherein the circuit board body 100 includes an arc-shaped area, and the arc-shaped area can be bent along the thickness direction of the circuit board body 100, and the arc-shaped area includes an inner arc area 110 and an outer arc area 120; and also includes a first anti-tear block 210, and the first anti-tear block 210 wraps the inner arc area 110.

[0040] When the FPC circuit board is bent or twisted, the inner arc area 110 on the circuit board body 100 is bent. Since the circuit board body 100 is cut from a whole board, the edges are relatively weak, especially the inner arc area 110 is most likely to tear. By wrapping the inner arc area 110 on the circuit board body 100 with the first tear-resistant block 210, the structural strength of the inner arc area 110 can be effectively improved, the structural stability of the inner arc area 110 can be ensured, and the tear resistance of the FPC circuit board can be improved, and the stability of the FPC circuit board can be improved.

[0041] In this embodiment, a second anti-tear block 220 is further included, and the second anti-tear block 220 wraps the outer arc area 120 .

[0042] The first tear-resistant block 210 protects the inner arc area 110, and the second tear-resistant block 220 protects the outer arc area 120, which together form a comprehensive protection for the entire arc area, reducing the risk of tearing at any part during the bending process. When bending, both the inner and outer arc areas 120 are subjected to stress. Adding the second tear-resistant block 220 can more effectively disperse the stress, avoid stress concentration in a certain area, and thus reduce the risk of tearing.

[0043] In this embodiment, the first tear-resistant blocks 210 are distributed along the circumference of the inner arc area 110 , and the second tear-resistant blocks 220 are distributed along the circumference of the outer arc area 120 ;

[0044] The cross-sectional shapes of the first anti-tear block 210 and the second anti-tear block 220 are both U-shaped, and the edges of the first anti-tear block 210 and the second anti-tear block 220 are both provided with arc corners.

[0045] Specifically, the U-shaped cross-section design increases the contact area between the anti-tear block and the circuit board, provides stronger adhesion and support, effectively disperses stress and prevents tearing.

[0046] More specifically, the arc-shaped corner design of the edge of the anti-tear block avoids stress concentration caused by sharp corners, prevents self-cutting of the anti-tear block and the circuit board when bent, and reduces the risk of tearing at the edge during the bending process.

[0047] In this embodiment, the first anti-tear block 210 and the second anti-tear block 220 are both provided with grooves 300 , and the grooves 300 are distributed along the radial direction of the anti-tear blocks.

[0048] The presence of the groove 300 makes the anti-tear block more flexible when bent, and can better adapt to the bending deformation of the FPC circuit board, avoiding stress concentration and tearing caused by the anti-tear block being too rigid.

[0049] In this embodiment, the first anti-tear block 210 and the second anti-tear block 220 both include a base layer 400 and a fiber mesh layer 500 . The fiber mesh layer 500 is disposed on the inner side of the base layer 400 , and the inner side refers to a side of the base layer 400 close to the circuit board body 100 .

[0050] Specifically, the base layer 400 constitutes the material of the main body of the tear-resistant block and provides support and shape.

[0051] More specifically, the fiber mesh layer 500 is a mesh structure located on the inner side of the base layer 400 (the side close to the circuit board body 100 ), and is made of fiber material.

[0052] The mesh structure of the fiber mesh layer 500 helps to disperse stress, prevent stress concentration at a specific point, and further reduce the risk of tearing. The fiber material itself has a certain degree of flexibility and can better adapt to the bending deformation of the FPC circuit board.

[0053] In this embodiment, a glue layer 600 is further provided on the inner side of the fiber mesh layer 500 , and the glue layer 600 is glued and fixed to the circuit board body 100 . The inner side refers to a side of the fiber mesh layer 500 close to the circuit board body 100 .

[0054] The addition of the glue layer 600 significantly improves the bonding strength between the anti-tear block and the circuit board, enabling it to withstand stronger external forces and more frequent bending. At the same time, the glue layer 600 fills the gap, enhances the stability of the overall structure, and prevents the anti-tear block from displacement or deformation during bending. Example 2

[0055] like Figure 1-Figure 7 As shown, this embodiment provides a tear-resistant FPC circuit board, which includes a circuit board body 100, wherein the circuit board body 100 includes an arc-shaped area, and the arc-shaped area can be bent along the thickness direction of the circuit board body 100, and the arc-shaped area includes an inner arc area 110 and an outer arc area 120; and also includes a first anti-tear block 210, and the first anti-tear block 210 wraps the inner arc area 110.

[0056] It also includes a second anti-tear block 220 , which wraps the outer arc area 120 .

[0057] The first anti-tear blocks 210 are distributed along the circumference of the inner arc area 110 , and the second anti-tear blocks 220 are distributed along the circumference of the outer arc area 120 ;

[0058] The cross-sectional shapes of the first anti-tear block 210 and the second anti-tear block 220 are both U-shaped, and the edges of the first anti-tear block 210 and the second anti-tear block 220 are both provided with arc corners.

[0059] In this embodiment, the first anti-tear block 210 and the second anti-tear block 220 in the same arc-shaped area are connected to form an anti-tear belt 200 with an integrated structure.

[0060] The integrated design connects the first and second tear-resistant blocks 220 of the inner and outer arc regions 120 into a whole, forming a stronger structural support, effectively resisting various stresses during the bending process, and reducing the risk of tearing. At the same time, the tear-resistant blocks are designed as an integrated tear-resistant belt 200, which can simplify the production process, improve production efficiency, and reduce production costs.

[0061] In this embodiment, the tear-resistant tape 200 is provided with grooves 300 , and the grooves 300 are distributed along the radial direction of the arc-shaped area.

[0062] The structural support and stress distribution advantages of the integrated tear-resistant tape 200, combined with the flexibility advantages of the groove 300 design, make the FPC circuit board more reliable and durable when bent.

[0063] In this embodiment, the first anti-tear block 210 and the second anti-tear block 220 both include a base layer 400 and a copper mesh layer 700. The copper mesh layer 700 is disposed on the inner side of the base layer 400. The inner side refers to a side of the base layer 400 close to the circuit board.

[0064] Specifically, in this embodiment, the material of the base layer 400 is the same as the base material of the circuit board body 100 , which is polyimide (PI) or polyester (PET).

[0065] Specifically, the copper mesh layer 700 is disposed on the inner side of the base layer 400, that is, the side close to the circuit board body 100. The copper mesh layer 700, as an additional reinforcement structure, can better resist tensile and tearing stresses and further improve the tearing resistance.

[0066] More specifically, the copper mesh layer 700 can play a role in radio frequency shielding and reduce electromagnetic interference.

[0067] In this embodiment, a glue layer 600 is further provided on the inner side of the copper mesh layer 700, and the glue layer 600 is glued and fixed to the circuit board body 100, and the inner side refers to a side of the copper mesh layer 700 close to the circuit board body 100. The copper mesh layer 700 is obtained by lamination, exposure, development, and etching.

[0068] Specifically, the glue layer 600 firmly bonds the copper mesh layer 700 to the circuit board body 100 , ensuring the connection strength and reliability between the anti-tear block and the circuit board, and preventing peeling or delamination between the copper mesh layer 700 and the circuit board body 100 .

[0069] More specifically, the manufacturing of the through-mesh layer is performed by laminating the substrate with copper foil and the photosensitive dry film together by rolling. The pre-designed copper mesh pattern is exposed to the photosensitive dry film using an exposure machine. The exposed photosensitive dry film is developed using a developer to remove the unexposed portion, leaving the copper mesh pattern. The copper foil not protected by the photosensitive dry film is etched away using an etching solution to form the desired copper mesh layer 700 pattern.

[0070] More specifically, the copper mesh pattern can be manufactured synchronously with the circuit board body 100 .

[0071] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the application. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a restriction. Therefore, other examples of exemplary embodiments can have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in the subsequent accompanying drawings.

[0072] In addition, it should be noted that the use of terms such as "first" and "second" to limit is only for the convenience of distinction. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of this application.

[0073] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A tear-resistant FPC circuit board, characterized in that: include: A circuit board body (100), the circuit board body (100) comprising an arc-shaped area, the arc-shaped area being capable of bending along a thickness direction of the circuit board body (100), the arc-shaped area comprising an inner arc area (110) and an outer arc area (120); It also includes a first anti-tear block (210), wherein the first anti-tear block (210) wraps the inner arc area (110).

2. The tear-resistant FPC circuit board according to claim 1, characterized in that: It also includes a second anti-tear block (220), wherein the second anti-tear block (220) wraps the outer arc area (120).

3. The tear-resistant FPC circuit board according to claim 2, characterized in that: The first anti-tear blocks (210) are distributed along the circumference of the inner arc area (110), and the second anti-tear blocks (220) are distributed along the circumference of the outer arc area (120); The cross-sectional shapes of the first anti-tear block (210) and the second anti-tear block (220) are both U-shaped, and the edges of the first anti-tear block (210) and the second anti-tear block (220) are both provided with arc corners.

4. The tear-resistant FPC circuit board according to claim 3, characterized in that: The first anti-tear block (210) and the second anti-tear block (220) are both provided with grooves (300), and the grooves (300) are distributed along the radial direction of the anti-tear blocks.

5. The tear-resistant FPC circuit board according to claim 4, characterized in that: The first anti-tear block (210) and the second anti-tear block (220) in the same arc-shaped area are connected to form an anti-tear belt (200) of an integrated structure.

6. The tear-resistant FPC circuit board according to any one of claims 2 to 5, characterized in that: The first anti-tear block (210) and the second anti-tear block (220) both comprise a base layer (400) and a fiber mesh layer (500), wherein the fiber mesh layer (500) is arranged on the inner side surface of the base layer (400), and the inner side surface refers to a side surface of the base layer (400) close to the circuit board body (100).

7. The tear-resistant FPC circuit board according to any one of claims 2 to 5, characterized in that: The first anti-tear block (210) and the second anti-tear block (220) both comprise a base layer (400) and a copper mesh layer (700), wherein the copper mesh layer (700) is arranged on the inner side surface of the base layer (400), and the inner side surface refers to a side surface of the base layer (400) close to the circuit board.

8. The tear-resistant FPC circuit board according to claim 6, characterized in that: The inner side surface of the fiber mesh layer (500) is also provided with a glue layer (600), and the glue layer (600) is glued and fixed to the circuit board body (100). The inner side surface refers to a side surface of the fiber mesh layer (500) close to the circuit board body (100).

9. The tear-resistant FPC circuit board according to claim 7, characterized in that: The inner side surface of the copper mesh layer (700) is also provided with a glue layer (600), and the glue layer (600) is glued and fixed to the circuit board body (100); the inner side surface refers to a side surface of the copper mesh layer (700) close to the circuit board body (100), and the copper mesh layer (700) is obtained by lamination, exposure, development, and etching.

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