Anti-tear flexible circuit board and touch screen

Abstract

The application relates to the technical field of flexible circuit boards, in particular to a tear-proof flexible circuit board and a touch screen, wherein the tear-proof flexible circuit board comprises a circuit board and a plurality of adjacent interfaces arranged on the circuit board; the circuit board comprises a main plate and a branch plate; the main plate and the branch plate are respectively provided with tear-proof chamfers; and a tear-proof round corner is arranged at the intersection of the main plate and the branch plate; a tear-proof assembly is arranged at the intersection of the interfaces; and the profile of the tear-proof assembly is consistent with that of the intersection of the interfaces. The utility model can enhance the tear-proof performance of the whole flexible circuit board and ensure the stability and reliability of the structure of the flexible circuit board.

Description

Technical Field

[0001] This application relates to the field of flexible circuit board technology, and more specifically, to a tear-resistant flexible circuit board and a touch screen. Background Technology

[0002] As laptops become increasingly thinner and lighter, related components are being streamlined and compressed to fit the limited space of the entire device. For example, the space of the flexible circuit board connecting the touch screen to the touch screen printed circuit board is often compressed to the limit. Under such streamlined solutions, stress concentration can easily occur in the flexible circuit board when it is bent, which can easily lead to tearing at the stress concentration points.

[0003] Although existing technologies include various tear-resistant structures, there is still a high risk of tearing at corners, especially at the junctions where adjacent plugs are located. Therefore, how to design tear-resistant structures from the perspective of the overall performance of flexible circuit boards is a key technical point that needs to be focused on. Utility Model Content

[0004] The purpose of this application is to provide a tear-resistant flexible circuit board and a touch screen, which can enhance the overall tear resistance of the flexible circuit board and ensure the stability and reliability of the flexible circuit board structure.

[0005] To achieve the above objectives, in a first aspect, the present invention provides a tear-resistant flexible circuit board, including a circuit board and a plurality of adjacent interfaces disposed on the circuit board. The circuit board includes a main board and a branch board. The main board and the branch board are respectively provided with tear-resistant chamfers, and tear-resistant rounded corners are provided at the intersection of the main board and the branch board. The intersecting portion of the interface is provided with an anti-tear component, and the anti-tear component follows the contour of the intersecting portion of the interface.

[0006] In an optional embodiment, the tear-resistant chamfer includes a first chamfer disposed on the motherboard and a second chamfer disposed on the branch plate; The first chamfer and the second chamfer each include a groove disposed on the flexible circuit board.

[0007] In an optional embodiment, both the first chamfer and the second chamfer are arc-shaped groove chamfers with the same radius, and the direction of the line connecting the centers of the arc-shaped groove chamfers is the same as the extension direction of the branch plate relative to the main board.

[0008] In an optional embodiment, the tear-resistant rounded corner is provided at the intersection of the main board and the branch board, including a quarter-circle arc segment at both ends.

[0009] In an optional embodiment, the center of the arc segment is located at the intersection of the extension line of the branch plate side and the extension line of the main plate side.

[0010] In an optional embodiment, a reinforcing copper strip is provided on the inner side of the arc segment on the circuit board, and the outline of the reinforcing copper strip follows the outline of the arc segment.

[0011] In an optional embodiment, the anti-tear assembly is located at the root of the interface on the circuit board and includes a U-shaped copper strip disposed between the interfaces.

[0012] In an optional embodiment, the length of the U-shaped copper strip is greater than 2 / 3 of the distance from the intersection root of the interface to the end of the interface.

[0013] In an optional embodiment, the thickness of the reinforcing copper strip and the U-shaped copper strip is 0.2-0.5 mm; The distance between the reinforcing copper strip and the arc segment, and the distance between the U-shaped copper strip and the intersection contour of the interface are greater than 0.1 mm; The chamfer of the arc groove and the radius of the arc segment are 0.5-1.5mm.

[0014] Secondly, the present invention provides a touch screen, including a touch screen sensor, a main control circuit board, and a tear-resistant flexible circuit board as described in any of the foregoing embodiments, wherein the tear-resistant flexible circuit board is connected between the touch screen sensor and the main control circuit board.

[0015] The tear-resistant flexible circuit board in this application can enhance the tear resistance of different parts of the flexible circuit board by setting tear-resistant chamfers, tear-resistant rounded corners, and tear-resistant components, thereby ensuring the stability and reliability of the flexible circuit board structure.

[0016] Other features and advantages of this application will be described in detail in the following detailed description section. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the tear-resistant flexible circuit board in Embodiment 1 of this application; Figure 2 A schematic diagram of the installation structure of the tear-resistant component on the flexible circuit board; Figure 3 This is a schematic diagram of the tear-resistant flexible circuit board in Embodiment 2 of this application.

[0019] icon: 1-Circuit board; 11-Interface; 12-Main board; 13-Branch board; 2-Tear-resistant chamfer; 21-First chamfer; 22-Second chamfer; 3- Tear-resistant rounded corners; 4- Tear-resistant components; 5-Reinforcing copper strip. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, 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 some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0021] In the description of this application, it should be noted that the terms "inner" and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use. They are used only for the convenience of describing this application and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0022] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "setup" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0023] See Figure 1 as well as Figure 3 The tear-resistant flexible circuit board 1 in this application addresses the risk of tearing caused by stress concentration at the corners of the main board 12 and branch board 13 and the roots of adjacent interfaces 11 during bending due to spatial compression. By optimizing the structure of different stress concentration points, a multi-layered protection system is formed on the flexible circuit board 1, which significantly improves the structural reliability and service life of the flexible circuit board 1 under harsh spatial conditions.

[0024] Example 1 See Figures 1-2 The tear-resistant flexible circuit board 1 of this utility model has a main structure including a circuit board 1 and a plurality of adjacent interfaces 11 disposed on the circuit board 1. The circuit board 1 includes a main board 12 and a branch board 13.

[0025] In the classification, the motherboard 12 is usually the larger part that connects to the main control circuit board 1, while the branch board 13 is usually the part that connects to peripherals such as touch screen sensors. The adjacent interface 11 on the circuit board 1 is mainly used for interlocking with the corresponding connector.

[0026] To address the stress concentration caused by right angles or sharp corners at the edges of the main board 12 and branch board 13, this application provides tear-resistant chamfers 2 on the main board 12 and branch board 13 respectively, thus providing tear-resistant treatment from the structural aspect of the board surface.

[0027] Meanwhile, in order to take into account the stress concentration at the intersection of the main board 12 and the branch board 13, a tear-resistant rounded corner 3 is provided at the intersection of the main board 12 and the branch board 13.

[0028] Furthermore, by providing anti-tear components 4 at the intersection of adjacent interfaces 11, and making the contour direction of the anti-tear components 4 follow that of the intersection of interfaces 11, the intersection of interfaces 11 is reinforced.

[0029] Through the structural design of the different parts mentioned above, as well as the necessary structural reinforcement, the tear resistance of the flexible circuit board 1 can be enhanced as a whole.

[0030] First, the anti-tear chamfer 2 is set at the edge of the motherboard 12 and the branch board 13.

[0031] Specifically, the tear-resistant chamfer 2 includes a first chamfer 21 disposed on the main board 12 and a second chamfer 22 disposed on the branch board 13.

[0032] The first chamfer 21 is specifically an arc-shaped groove machined on the edge of the motherboard 12. Its radius is optimized according to the thickness and width of the motherboard 12, and is usually between 0.5mm and 1.5mm.

[0033] The second chamfer 22 is set on the side edge of the branch plate 13. In particular, the second chamfer 22 is an arc-shaped groove, the radius of which can be the same as the radius of the first chamfer 21, in order to simplify the design and processing.

[0034] Furthermore, the line connecting the centers of the arcs of the first chamfer 21 and the second chamfer 22 is in the same direction as the extension direction of the branch plate 13 relative to the main plate 12. This arrangement can guide stress release along the extension direction of the branch plate 13 and prevent stress from being transmitted into the main plate 12.

[0035] Secondly, regarding the tear resistance angle at the intersection of the main board 12 and the branch board 13, the tear-resistant rounded corner 3 is set at the intersection corner of the main board 12 and the branch board 13. More specifically, the tear-resistant rounded corner 3 is set at the T-shaped or L-shaped corner in the entire flexible circuit board 1 structure. By abandoning the traditional right-angle transition, the tear-resistant rounded corner 3 at the intersection corner can effectively release the concentrated stress.

[0036] Preferably, the beginning and end of the tear-resistant rounded corner 3 are quarter-circle segments, and the center of the tear-resistant rounded corner 3 is located at the virtual intersection point of the extension line of the side of the branch plate 13 and the extension line of the side of the main plate 12.

[0037] This precise positioning method ensures that the arc segment can perfectly and tangentially connect the edges of the main board 12 and the branch board 13, achieving a smooth geometric transition and a good stress relief effect.

[0038] Finally, from the angle of reinforcement at the root of multiple adjacent interfaces 11, the anti-tear assembly 4 is set at the root position of the interface 11 on the circuit board 1, including the U-shaped copper strip set between the interfaces 11. The outline of the U-shaped copper strip closely follows the outline direction of the intersection of the interfaces 11 to ensure that the U-shaped copper strip provides structural reinforcement in the area with the greatest stress at the root of the interface 11.

[0039] The length B of the U-shaped copper strip is greater than 2 / 3 of the distance A from the root of the intersection of the interface 11 to the end of the interface 11, so as to ensure that the reinforcement range of the U-shaped copper strip fully covers the root area with the greatest stress.

[0040] In the flexible circuit board 1 structure, right angles and sharp corners are areas where stress is typically concentrated and amplified. This application, by introducing tear-resistant chamfers 2 and tear-resistant rounded corners 3, optimizes the critical edges and corners of the circuit board 1 into smooth transition curves.

[0041] When the flexible circuit board 1 is bent, stretched or vibrated, the stress cannot accumulate at the smoothly transitioned curve, but can be evenly distributed to a larger area, fundamentally eliminating stress concentration points that lead to material fatigue and tearing.

[0042] By setting chamfers and rounded corners, mechanical interference during the production process is reduced, which not only protects the flexible circuit board 1 itself, but also reduces the wear of the fixture, thereby significantly improving production yield and efficiency.

[0043] The geometric design of the tear-resistant rounded corner 3, especially the precise positioning of the center of the tear-resistant rounded corner 3, ensures a continuous and smooth force flow between the main board 12 and the branch board 13. This avoids the formation of high-stress areas inside the corner, greatly improving the fatigue resistance of the entire flexible circuit board 1 when subjected to repeated bending.

[0044] Meanwhile, the U-shaped copper strip at the base of the interface 11 can serve as an internal skeleton for the flexible circuit board 1, effectively suppressing the slight shaking or twisting of the interface 11 during insertion and removal, and further improving the long-term reliability of the connection.

[0045] Example 2 See Figure 3 In this embodiment, the structure of the flexible circuit board 1 is basically the same as that in embodiment 1. The difference is that a reinforcing copper strip 5 is provided on the inner side of the arc segment of the tear-resistant rounded corner 3 on the circuit board 1. The outline of the reinforcing copper strip 5 follows the outline of the arc segment.

[0046] By introducing active metal reinforcement methods, additional copper strip structures are used to bear and distribute stress, making it suitable for applications with extremely high reliability requirements and more demanding working environments.

[0047] In this invention, the thickness D of the reinforcing copper strip 5 and the U-shaped copper strip is 0.2-0.5mm, which can fully balance tear resistance and the rigidity of the flexible circuit board 1. If the thickness is too thin, the ideal reinforcement effect cannot be achieved, while if the thickness is too thick, the rigidity of that part of the flexible circuit board 1 will be increased.

[0048] The spacing between the reinforced copper strip 5 and the arc segment, and the spacing C between the U-shaped copper strip and the intersection contour of the interface 11 are greater than 0.1mm, so that the reinforcing copper strip structure in the two parts maintains a small gap with the edge contour, so as to minimize the impact on bending flexibility.

[0049] The radius of the chamfered groove and the arc segment is 0.5-1.5mm, which can provide the best stress dispersion effect without excessively sacrificing the layout area of ​​the flexible circuit board 1.

[0050] In this application, the chamfering and rounding of the flexible circuit board 1 are optimized to guide the transmission of stress through a passive structural setting, while the added reinforcing copper strips 5 and U-shaped copper strips provide an active reinforcement structure to bear the stress.

[0051] Through the synergy of active guidance and passive load-bearing, the tear resistance of the flexible circuit board 1 can be enhanced as a whole.

[0052] Furthermore, the addition of copper strip 5 and U-shaped copper strip can also help dissipate the heat generated by the flexible circuit board 1 during operation, avoiding local overheating, thereby indirectly improving the lifespan of electronic components and the stability of signal transmission.

[0053] This utility model also provides a touch screen, including a touch screen sensor, a main control circuit board 1, and the tear-resistant flexible circuit board 1 described above. The tear-resistant flexible circuit board 1 is connected between the touch screen sensor and the main control circuit board 1, which can effectively solve the problem that the flexible circuit board 1 is prone to tearing under the thin and light design, and significantly improve the stability and service life of the device.

[0054] It should be noted that, where there is no conflict, the features in the embodiments of this application can be combined with each other.

[0055] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A tear-resistant flexible circuit board, characterized in that, The circuit board includes a circuit board and multiple adjacent interfaces disposed on the circuit board. The circuit board includes a main board and a branch board. The main board and the branch board are respectively provided with tear-resistant chamfers, and tear-resistant rounded corners are provided at the intersection of the main board and the branch board. The intersecting portion of the interface is provided with an anti-tear component, and the anti-tear component follows the contour of the intersecting portion of the interface.

2. The tear-resistant flexible circuit board according to claim 1, characterized in that, The tear-resistant chamfer includes a first chamfer disposed on the motherboard and a second chamfer disposed on the branch board; The first chamfer and the second chamfer each include a groove disposed on the flexible circuit board.

3. The tear-resistant flexible circuit board according to claim 2, characterized in that, Both the first chamfer and the second chamfer are arc-shaped groove chamfers with the same radius, and the direction of the line connecting the centers of the arc-shaped groove chamfers is the same as the extension direction of the branch plate relative to the main board.

4. The tear-resistant flexible circuit board according to claim 3, characterized in that, The tear-resistant rounded corner is provided at the intersection of the main board and the branch board, including a quarter-circle arc segment at both ends.

5. The tear-resistant flexible circuit board according to claim 4, characterized in that, The center of the arc segment is located at the intersection of the extension line of the side of the branch plate and the extension line of the side of the main plate.

6. The tear-resistant flexible circuit board according to claim 4, characterized in that, A reinforcing copper strip is provided on the inner side of the arc segment on the circuit board, and the outline of the reinforcing copper strip follows the outline of the arc segment.

7. The tear-resistant flexible circuit board according to claim 6, characterized in that, The anti-tear component is located at the root of the interface on the circuit board and includes a U-shaped copper strip disposed between the interfaces.

8. The tear-resistant flexible circuit board according to claim 7, characterized in that, The length of the U-shaped copper strip is greater than 2 / 3 of the distance from the root of the interface intersection to the end of the interface.

9. The tear-resistant flexible circuit board according to claim 7, characterized in that, The thickness of the reinforcing copper strip and the U-shaped copper strip is 0.2-0.5 mm; The distance between the reinforcing copper strip and the arc segment, and the distance between the U-shaped copper strip and the intersection contour of the interface are greater than 0.1 mm; The chamfer of the arc groove and the radius of the arc segment are 0.5-1.5mm.

10. A touchscreen, characterized in that, The device includes a touchscreen sensor, a main control circuit board, and a tear-resistant flexible circuit board as described in any one of claims 1-9, wherein the tear-resistant flexible circuit board is connected between the touchscreen sensor and the main control circuit board.

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