A FFC reinforcing plate

Abstract

The utility model relates to the technical field of reinforcing plate, especially a kind of FFC reinforcing plate, including reinforcing plate body and FFC cable, the reinforcing plate body includes base layer, adopts the PET film of thickness 25-50 μm;Stress release unit is located in the bending area of base layer and FFC cable connection.This utility model is with PET film as base layer, and through die stamping integrated continuous arc-shaped groove as stress release unit, the interlayer binding force is enhanced in combination with frosted processing, the adhesion layer of modified acrylic ester adhesive is used to realize smooth bonding and stress buffering, and the wear-resistant coating of polytetrafluoroethylene is matched to guarantee the durability of structure, effectively convert the concentrated stress of FFC cable bending into dispersed deformation energy, significantly reduce the risk of fracture, improve its mechanical durability and application stability, suitable for connector nearby, equipment movable joint and other bending high-frequency scenarios.

Description

Technical Field

[0001] This utility model relates to the field of reinforcing plate technology, and in particular to an FFC reinforcing plate. Background Technology

[0002] FFC (Flexible Flat Cable), a key component for signal and power transmission in electronic devices, is widely used in printers, laptops, medical devices, and other applications requiring frequent bending. The mechanical strength of its bending areas relies on reinforcing plates. Current FFC reinforcing plates mostly use PET or PI film as the base layer, simply bonded to the cable with adhesive. While this improves local rigidity, it has significant technical drawbacks: Traditional reinforcing plates have a flat base layer without a dedicated stress relief design. When FFC cables are bent at high frequencies near connectors or joints, bending stress concentrates at the connection edge between the base layer and the cable, easily leading to cracking of the base layer or delamination of the cable from the reinforcing plate, directly affecting transmission stability. Moreover, the base layer and adhesive layer are mostly in contact with smooth surfaces. Under long-term bending deformation, the adhesive interface is prone to separation due to insufficient friction, further exacerbating the stress concentration effect. Utility Model Content

[0003] The purpose of this utility model is to provide an FFC reinforcing plate that solves the problems of stress concentration during bending caused by the lack of a special stress relief design in traditional FFC reinforcing plates, which easily leads to cracking of the base layer or delamination of cables, as well as insufficient bonding force and easy separation between the base layer and the adhesive layer due to the smooth surface contact.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: An FFC reinforcement plate includes a reinforcement plate body and an FFC cable, wherein the reinforcement plate body includes: The base layer uses a PET film with a thickness of 25-50μm; A stress relief unit is provided in the bending area where the base layer connects to the FFC cable. The stress relief unit is composed of continuously arranged arc-shaped grooves that extend along the width direction of the base layer. An adhesive layer, covering the surface of the base layer and stress relief unit, is used for fixed connection with FFC cables.

[0005] Preferably, the depth of the arc-shaped groove is 1 / 4 to 1 / 3 of the thickness of the base layer, the groove opening width is 0.8 to 1.5 mm, and the spacing between adjacent grooves is equal to the groove opening width.

[0006] Preferably, the length of the stress relief unit is sufficient to cover the entire bending area between the base layer and the FFC cable connection end.

[0007] Preferably, the base layer has a frosted layer on the surface of the area where the stress relief unit is located to enhance the bonding force with the adhesive layer.

[0008] Preferably, the adhesive layer is made of modified acrylic adhesive.

[0009] Preferably, the cross-section of the arc-shaped groove is an arc structure, and the bottom of the groove is a smooth curved surface without sharp corners.

[0010] Preferably, the side of the base layer away from the stress relief unit is provided with a wear-resistant coating.

[0011] Preferably, the stress relief unit and the base layer are integrally formed and manufactured by a die stamping process.

[0012] This utility model has at least the following beneficial effects: By using PET film as the base layer and continuous arc-shaped grooves formed in one piece by die stamping as stress relief units, combined with frosting treatment to enhance interlayer bonding, and using modified acrylic adhesive to achieve smooth bonding and stress buffering, and with polytetrafluoroethylene wear-resistant coating to ensure structural durability, the concentrated stress when FFC cable is bent is effectively converted into dispersed deformation energy, significantly reducing the risk of breakage and improving its mechanical durability and application stability. It is suitable for high-frequency bending scenarios such as near connectors and moving joints of equipment. Attached Figure Description

[0013] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a cross-sectional view of the base layer of this utility model; Figure 3 This is a schematic diagram of the frosted layer structure of this utility model.

[0015] In the diagram: 1. Reinforcing plate body; 101. Base layer; 102. Stress relief unit; 103. Adhesive layer; 104. Wear-resistant coating; 105. Arc-shaped groove; 106. Frosted treatment layer; 2. FFC cable. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0017] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0018] Reference Figure 1-3 An FFC reinforcement plate, comprising: Base layer 101 uses a PET film with a thickness of 25-50μm; The stress relief unit 102 is located in the bending area where the base layer 101 connects to the FFC cable. The stress relief unit 102 is composed of continuously arranged arc-shaped grooves 105, which extend along the width direction of the base layer 101. An adhesive layer 103 covers the surface of the base layer 101 and the stress relief unit 102 and is used to fix the connection with the FFC cable. The continuous arc-shaped groove 105 disperses bending stress through segmented elastic deformation, and the adhesive layer 103 fills the groove to form a flat adhesive surface, avoiding direct contact between FFC and the uneven structure. The three work together to convert concentrated stress into dispersed deformation energy, thereby reducing the risk of FFC fracture from the root.

[0019] Furthermore, the depth of the arc-shaped groove 105 is 1 / 4 to 1 / 3 of the thickness of the base layer 101, the groove opening width is 0.8 to 1.5 mm, and the spacing between adjacent grooves is equal to the groove opening width. The depth design of the arc-shaped groove 105 can balance the deformation space and the strength of the base layer 101, and avoid damage to the base layer 101 caused by the groove being too deep; the spacing is equal to the opening width to ensure continuous and uniform stress distribution and prevent local stress overlap.

[0020] Furthermore, the stress relief unit 102 has a length of 8-15mm, covering the entire bending area between the base layer 101 and the FFC cable connection end; The FFC bend is concentrated in the 8-15mm area at the connection end, and this length ensures that the stress relief unit 102 is perfectly matched with the bend area.

[0021] Furthermore, the base layer 101 has a frosted layer 106 on the surface of the area where the stress relief unit 102 is located, with a roughness Ra of 0.5-1.2μm, to enhance the bonding force with the adhesive layer 103; The sanding process increases the contact area and surface roughness, thereby enhancing the mechanical interlocking force and friction between the base layer 101 and the adhesive layer 103, preventing them from delaminating and separating during bending, and ensuring the synergistic effect of the stress relief structure.

[0022] Furthermore, the adhesive layer 103 uses a modified acrylic adhesive with a thickness of 6-12 μm, and has a peel strength of ≥4 N / cm for FFC cables in a 180° peel test. The modified acrylic adhesive combines high viscosity and elastic deformation capability. The high viscosity ensures a stable connection between FFC and the reinforcing plate; the elasticity follows the deformation of the 101 groove in the base layer, helping to absorb bending stress and avoiding stress transmission caused by rigid bonding.

[0023] Furthermore, the cross-section of the arc-shaped groove 105 is an arc structure with a radius of 0.6-1.2mm, and the bottom of the groove is a smooth curved surface without sharp corners. The superior arc and smooth curved surface avoid stress concentration at the corners. Traditional right-angled grooves are prone to stress abrupt changes at the corners. The superior arc structure allows stress to be continuously transmitted along the curved surface, which greatly reduces the risk of cracking of the base layer 101.

[0024] Furthermore, the base layer 101 is provided with a wear-resistant coating 104 on the side away from the stress relief unit 102, the coating thickness is 3-5μm, and it is made of polytetrafluoroethylene material; The polytetrafluoroethylene coating covers the back side of the base layer 101, resisting frictional damage from the outer shell and bracket during installation or use, preventing the base layer 101 from thinning or breaking due to wear, and indirectly ensuring the integrity of the stress relief structure.

[0025] Furthermore, the stress relief unit 102 and the base layer 101 are integrally formed structures, manufactured by die stamping process, and the groove edges are burr-free.

[0026] The one-piece molding structure ensures the structural continuity between the base layer 101 and the stress relief unit 102, avoiding weak joints in spliced ​​structures.

[0027] In summary, by using PET film as the base layer 101 and a continuous arc-shaped groove 105 integrally formed by die stamping as a stress relief unit 102, combined with frosting treatment to enhance interlayer bonding, and using a modified acrylic adhesive layer 103 to achieve smooth bonding and stress buffering, and with a polytetrafluoroethylene wear-resistant coating 104 to ensure structural durability, the concentrated stress during FFC cable bending is effectively converted into dispersed deformation energy, significantly reducing the risk of breakage, improving its mechanical durability and application stability, and is suitable for high-frequency bending scenarios such as near connectors and moving joints of equipment.

[0028] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A FFC reinforcement plate comprising a reinforcement plate body and a FFC cable, characterized by, The reinforcing plate body includes: The base layer uses a PET film with a thickness of 25-50μm; A stress relief unit is provided in the bending area where the base layer connects to the FFC cable. The stress relief unit is composed of continuously arranged arc-shaped grooves that extend along the width direction of the base layer. An adhesive layer, covering the surface of the base layer and stress relief unit, is used for fixed connection with FFC cables.

2. The FFC reinforcing plate according to claim 1, characterized by, The depth of the arc-shaped groove is 1 / 4 to 1 / 3 of the thickness of the base layer, the groove opening width is 0.8 to 1.5 mm, and the distance between adjacent grooves is equal to the groove opening width.

3. The FFC reinforcing plate according to claim 2, characterized by, The length of the stress relief unit is sufficient to cover the entire bending area between the base layer and the FFC cable connection point.

4. The FFC reinforcing plate according to claim 1, characterized by, The base layer has a frosted finish on the surface of the area where the stress relief unit is located to enhance the adhesion with the adhesive layer.

5. The FFC reinforcing plate according to claim 1, characterized by, The adhesive layer uses a modified acrylic adhesive.

6. The FFC reinforcing plate according to claim 1, characterized by, The cross-section of the arc-shaped groove is an arc structure, and the bottom of the groove is a smooth curved surface without sharp corners.

7. The FFC reinforcing plate according to claim 1, characterized by, The base layer has a wear-resistant coating on the side away from the stress relief unit.

8. The FFC reinforcing plate according to claim 1, characterized by, The stress relief unit and the base layer are integrally formed and manufactured by die stamping process.

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