FPC cable structure

Abstract

The utility model relates to the technical field of electronic components, and provides an FPC cable structure, which comprises a cable body and a reinforcing plate, and is characterized in that the cable body extends along a first direction; the reinforcing plate comprises a connecting part and a first extending part, the length of the connecting part in the second direction is larger than or equal to the length of the cable body, the second direction is perpendicular to the first direction, and the cable body is attached to one side of the connecting part; the first extension part is arranged at one end, facing the cable body, of the connecting part and extends in the first direction, and the length of the first extension part in the second direction is larger than or equal to the length of the cable body. The FPC cable structure provided by the utility model is used for solving the defect that the FPC cable is easy to generate a stress set at the corner of the reinforcing plate, and the non-fixed connection design of the first extension part and the cable body allows the cable body to generate compliant relative displacement with the first extension part of the reinforcing plate when the cable body is bent, so that the cable body is not easy to deform. The problem that the cable body is damaged due to stress concentration can be effectively improved, and the service life of the cable body can be prolonged.

Description

Technical Field

[0001] This utility model relates to the field of electronic component technology, and in particular to an FPC cable structure. Background Technology

[0002] Flexible printed circuit (FPC) cables are widely used in electronic devices due to their thinness and flexibility. On the back of the gold fingers of an FPC cable, a polyimide (PI) reinforcing plate is typically used for localized reinforcement to ensure structural stability during connector insertion and removal. However, traditional reinforcing plates often have sharp right-angle edges formed during die-cutting. When the FPC cable is twisted or repeatedly bent, stress concentration can easily occur at the corners of the reinforcing plate.

[0003] To alleviate this problem, the industry generally adopts a solution of rounding the edges of the reinforcing plate. However, although rounding can improve the local stress distribution, it cannot completely eliminate the shear stress caused by the relative sliding between the wire and the reinforcing plate interface. Moreover, under long-term bending conditions, the cumulative damage in the stress concentration area can still lead to cable delamination or breakage. Utility Model Content

[0004] This utility model provides an FPC cable structure to solve the defect of stress concentration at the corner of the reinforcing plate in the existing FPC cable. The non-fixed connection design between the first extension and the cable body allows the cable body to undergo compliant relative displacement with the first extension of the reinforcing plate when bent, which can effectively improve the problem of stress concentration and even damage to the cable body and improve the service life of the cable body.

[0005] The FPC cable structure provided by this utility model includes:

[0006] The cable body extends along the first direction;

[0007] Reinforcing plates, including:

[0008] A connecting portion, wherein the length of the connecting portion along a second direction is greater than or equal to the length of the cable body, the second direction is perpendicular to the first direction, and the cable body is attached to one side of the connecting portion;

[0009] A first extension is provided at one end of the connecting portion facing the cable body and extends along the first direction, wherein the length of the first extension along the second direction is greater than or equal to the length of the cable body.

[0010] The FPC cable structure provided by this utility model further includes a second extension, which is connected to the first extension along the second direction, and the total length of the first extension and the second extension along the second direction is greater than the length of the cable body.

[0011] According to the FPC cable structure provided by this utility model, there are two second extensions, and the two second extensions are symmetrically arranged at both ends of the first extension along the second direction.

[0012] According to the FPC cable structure provided by this utility model, the shape of the second extension is a right triangle, and the width of the second extension gradually increases along the first direction.

[0013] The FPC cable structure provided by this utility model also includes a first chamfer;

[0014] The first chamfer is located at the connection between the connecting portion and the first extension portion;

[0015] Alternatively, the first chamfer may be located at the junction of the connecting portion and the second extension portion.

[0016] According to the FPC cable structure provided by this utility model, a second chamfer is provided at the edge of the second extension.

[0017] According to the FPC cable structure provided by this utility model, the radius of the second chamfer is a, where the value of a ranges from 0.5mm to 1.0mm.

[0018] According to the FPC cable structure provided by this utility model, the width of the second extension is b, wherein the value of b ranges from 1mm to 3mm.

[0019] According to the FPC cable structure provided by this utility model, the length of the first extension is c, where the value of c ranges from 1.5mm to 3mm.

[0020] According to the FPC cable structure provided by this utility model, the first extension and the connecting part are arranged at an angle to each other, and the opening of the angle faces away from the cable body.

[0021] This invention provides an FPC cable structure in which a reinforcing plate is decomposed into a combination of a connecting portion and a first extension portion. The reinforcing plate forms a connecting portion in the second direction, covering the cable body, and extends a first extension portion in the first direction, which is not fixedly connected to the cable body. Since the cable body is only fixedly connected to the connecting portion, it maintains surface contact in the first extension portion area. When the cable body twists or bends, its bending area can slide relative to the surface of the first extension portion along the first direction, thereby avoiding rigid contact between the cable and the edge of the reinforcing plate. This sliding mechanism allows bending stress to no longer concentrate at a single interface at the edge of the reinforcing plate, but rather to be dispersed and transmitted through the flexible deformation of the cable itself and the surface contact of the first extension portion of the reinforcing plate, thus reducing the peak value of local shear stress.

[0022] Compared to the traditional approach of improving edge morphology through rounded corners in existing technologies, this invention fundamentally alters the stress transmission path in cable structures by optimizing the topology of the reinforcing plate structure. Specifically, while traditional rounded corner solutions can alleviate stress concentration at the edges, they cannot eliminate the shear slip effect between the cable and the reinforcing plate interface, resulting in periodic shear stress accumulation during dynamic bending. In contrast, the non-fixed connection between the first extension and the cable body in this invention allows for compliant relative displacement between the cable body and the first extension of the reinforcing plate during bending. This shifts the stress concentration point from the edge of the reinforcing plate to a more flexible area within the cable body, utilizing the cable's inherent ductility to release stress. This effectively addresses the problem of stress concentration leading to cable breakage and extends the cable's service life. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art 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.

[0024] Figure 1 This is a front view of the FPC cable structure provided in this embodiment of the utility model.

[0025] Figure label:

[0026] 100: Cable body; 200: Reinforcing plate; 210: Connecting part; 220: First extension part; 230: Second extension part; 240: First chamfer; 250: Second chamfer. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions 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, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0028] In the description of the embodiments of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" 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 mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application based on the specific circumstances.

[0029] In the embodiments of this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0030] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the embodiments of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0031] Figure 1 This is a front view of the FPC cable structure provided in this embodiment of the utility model.

[0032] See Figure 1In an optional embodiment of this utility model, the FPC cable structure includes a cable body 100 and a reinforcing plate 200. For ease of explanation, a first direction and a second direction are defined herein. The first direction is parallel to the length direction of the cable body 100, and the second direction is parallel to the width direction of the cable body 100. The first direction is perpendicular to the second direction. The structure of the cable body 100 can be found in the prior art.

[0033] The cable body 100 extends along a first direction; the reinforcing plate 200 includes a connecting portion 210 and a first extension portion 220. The length of the connecting portion 210 along a second direction is greater than or equal to the length of the cable body 100 along the second direction. In other words, with reference to the length and width directions of the cable body 100, the width of the connecting portion 210 is greater than or equal to the width of the cable body 100.

[0034] The cable body 100 is attached to one side of the connecting portion 210, and this connection structure can also be referred to in the prior art. A first extension 220 is provided at the end of the connecting portion 210 facing the cable body 100, and the first extension 220 extends along a first direction. The length of the first extension 220 along a second direction is greater than or equal to the length of the cable body 100, which is similar to the aforementioned, that is, the width of the first extension 220 is greater than or equal to the width of the cable body 100. It is important to note that in this embodiment, the cable body 100 is only connected to the connecting portion 210, and there is no fixed connection between the cable body 100 and the first extension 220. Under normal conditions, the cable body 100 and the first extension 220 are in surface contact.

[0035] See Figure 1 It is understood that in the FPC cable structure provided by this utility model, by decomposing the reinforcing plate 200 into a combined structure of a connecting portion 210 and a first extension portion 220, the reinforcing plate 200 forms a connecting portion 210 in the second direction whose width covers the cable body 100, and extends a first extension portion 220 in the first direction that is not fixedly connected to the cable body 100. Since the cable body 100 is only fixedly connected to the connecting portion 210, it maintains a surface contact state in the area of ​​the first extension portion 220. When the cable body 100 is twisted or bent, its bending area can slide relative to the surface of the first extension portion 220 along the first direction, thereby avoiding rigid contact between the wire and the edge of the reinforcing plate 200. This sliding mechanism allows the bending stress to no longer be concentrated at a single interface at the edge of the reinforcing plate 200, but to be dispersed and transmitted through the flexible deformation of the wire itself and the surface contact of the first extension portion 220 of the reinforcing plate 200, thus reducing the peak value of local shear stress.

[0036] Compared to the traditional approach of improving edge morphology through rounded corners in existing technologies, this invention fundamentally changes the stress transmission path in the FPC cable structure by optimizing the topology of the reinforcing plate 200. Specifically, while traditional rounded corner solutions can alleviate stress concentration at the edges, they cannot eliminate the shear slip effect between the cable and the reinforcing plate 200 interface, resulting in periodic shear stress accumulation during dynamic bending. In contrast, the non-fixed connection between the first extension 220 and the cable body 100 in this invention allows for compliant relative displacement between the cable body 100 and the first extension 220 of the reinforcing plate 200 during bending. This allows stress concentration points to shift from the edge of the reinforcing plate 200 to a more flexible area within the cable body, utilizing the cable body 100's own ductility to release stress. This effectively improves the problem of stress concentration leading to breakage in the cable body 100, thus extending its service life.

[0037] Continue reading Figure 1 In an optional embodiment of the present invention, the FPC cable structure further includes a second extension 230, which is connected to the first extension 220 along a second direction. The total length of the first extension 220 and the second extension 230 along the second direction is greater than the length of the cable. The second extension 230 can be an independent component of the first extension 220, or the second extension 230 can be obtained by extending the first extension 220 along the second direction.

[0038] See Figure 1 It is understood that in the FPC cable structure provided by this utility model, by adding a second extension 230 connected to the first extension 220 along the second direction, the total length of the first extension 220 and the second extension 230 in the second direction can exceed the length range of the cable body 100, thereby forming an extended coverage of the cable body 100 in the second direction. In this way, when the cable body 100 is bent or twisted, the composite support surface formed by the second extension 230 and the first extension 220 can provide a larger range of contact support in the width direction of the cable body 100, thereby preventing the cable body 100 from scratching the edge of the first extension 220 and improving the safety of the cable body 100.

[0039] Continue reading Figure 1In an optional embodiment of this utility model, two second extension portions 230 are provided, and the two second extension portions 230 are symmetrically arranged at both ends of the first extension portion 220 along the second direction. It can be understood that by symmetrically arranging two second extension portions 230 in the second direction, so that they are located on both sides of the first extension portion 220 respectively, a symmetrically distributed extension support structure can be formed on both sides of the width direction of the cable body 100. This ensures that the cable body 100 can be protected whether it is bent from the left or right side, thereby enabling the cable body 100 to be applied to more complex working environments and improving the adaptability and versatility of the FPC cable structure.

[0040] In an optional embodiment of this utility model, the second extension 230 is shaped like a right-angled triangle, and its width gradually increases along the first direction. It is understood that the hypotenuse of the right-angled triangle reduces material redundancy in the non-contact area compared to a rectangular extension, effectively reducing the weight of the FPC cable structure. For large-scale FPC cable structures, this effectively reduces handling difficulty, improves transportation convenience, and enhances overall economic efficiency. In other optional embodiments of this utility model, the second extension 230 can also be rectangular, such as... Figure 1 As shown, the specific determination can be made adaptively based on the actual situation.

[0041] Continue reading Figure 1 In an optional embodiment of the present invention, a first chamfer 240 is further provided at the connection between the connecting portion 210 and the first extension portion 220; or, the first chamfer 240 is provided at the connection between the connecting portion 210 and the second extension portion 230. It can be understood that by providing the first chamfer 240, the geometric transition of the junction area can be made smoother, reducing stress concentration at this point; in addition, the shape of the chamfer is more in line with the fingertips, making it easier to grip during assembly, which can improve the convenience and comfort of assembly.

[0042] Continue reading Figure 1 In an optional embodiment of this utility model, a second chamfer 250 is provided at the edge of the second extension 230. It is understood that this arrangement reduces stress concentration at the edge of the second extension 230 and prevents the edge of the second extension 230 from scratching the cable body 100 during storage and assembly. The radius of the second chamfer 250 is 'a', where 'a' ranges from 0.5mm to 1.0mm. For example, 'a' can be 0.5mm, 0.6mm, 0.7mm, 0.8mm, or 1.0mm. It is understood that limiting the chamfer radius to this range improves the uniformity of the FPC cable structure and facilitates standardized production of the FPC cable structure.

[0043] Continue reading Figure 1 In an optional embodiment of this utility model, the width of the second extension 230 is b, wherein the value of b ranges from 1mm to 3mm. For example, b can be 1mm, 1.5mm, 2mm, 2.5mm, or 3mm. It is understood that limiting the width of the second extension 230 to the above-mentioned range can ensure the protective function of the second extension 230 on the cable body 100, and can also avoid the impact of the excessive length of the second extension 230 on the assembly and processing. In addition, it can also improve the uniformity of the FPC cable structure and facilitate the standardized production of the FPC cable structure.

[0044] Continue reading Figure 1 In an optional embodiment of this utility model, the length of the first extension 220 is c, where the value of c ranges from 1.5mm to 3mm. For example, c can be 1.5mm, 2mm, 2.5mm, or 3mm. It is understood that by limiting the length of the first extension 220 to the above-mentioned range, when the cable body 100 is bent, the first extension 220 can form a support span in the first direction of the cable body 100 that adapts to the bending deformation requirements. Different length values ​​can balance the support strength and structural lightweight requirements in different application scenarios. For example, a shorter length is suitable for micro-bending conditions to reduce the weight of the reinforcing plate 200, while a longer length is suitable for large-angle bending scenarios to expand the stress dispersion area. In this way, bending performance and structural compactness can be synergistically optimized within a limited size range.

[0045] In an optional embodiment of this utility model, the first extension 220 and the connecting portion 210 are arranged at an angle to each other, with the opening of the angle facing away from the cable body 100. That is, the first extension 220 is bent or flexed towards the side away from the cable body 100. It can be understood that by arranging the first extension 220 and the connecting portion 210 at an angle with the opening facing away from the cable body 100, the reinforcing plate 200 can form an outwardly flared geometric configuration at the junction area of ​​the first extension 220 and the connecting portion 210. When the cable body 100 is bent, the angled structure of the first extension 220 towards the outside of the cable provides a pre-set clearance space for the deformation of the cable, allowing the curvature change generated during the bending process to naturally extend in accordance with the direction of the angle opening, thereby avoiding interference in the deformation path of the cable caused by the vertical pressure of the reinforcing plate 200 support surface.

[0046] It should be noted that the technical solutions in the various embodiments of this utility model can be combined with each other, but the basis for such combination is that they can be implemented by those skilled in the art. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist, that is, it is not within the protection scope of this utility model.

[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. An FPC cable structure, characterized in that, include: The cable body (100) extends along a first direction; Reinforcing plate (200), including: A connecting portion (210) has a length in a second direction that is greater than or equal to the length of the cable body (100), the second direction being perpendicular to the first direction, and the cable body (100) being attached to one side of the connecting portion (210). A first extension (220) is provided at one end of the connecting portion (210) facing the cable body (100) and extends along the first direction. The length of the first extension (220) along the second direction is greater than or equal to the length of the cable body (100).

2. The FPC cable structure according to claim 1, characterized in that, It also includes a second extension (230), which is connected to the first extension (220) along the second direction. The total length of the first extension (220) and the second extension (230) along the second direction is greater than the length of the cable body (100).

3. The FPC cable structure according to claim 2, characterized in that, There are two second extensions (230), and the two second extensions (230) are symmetrically disposed at both ends of the first extension (220) along the second direction.

4. The FPC cable structure according to claim 3, characterized in that, The second extension (230) is in the shape of a right triangle, and the width of the second extension (230) gradually increases along the first direction.

5. The FPC cable structure according to claim 2, characterized in that, It also includes the first chamfer (240); The first chamfer (240) is provided at the connection between the connecting portion (210) and the first extension portion (220); Alternatively, the first chamfer (240) may be located at the junction of the connecting portion (210) and the second extension portion (230).

6. The FPC cable structure according to claim 2, characterized in that, A second chamfer (250) is provided at the edge of the second extension (230).

7. The FPC cable structure according to claim 6, characterized in that, The radius of the second chamfer (250) is a, where the value of a ranges from 0.5mm to 1.0mm.

8. The FPC cable structure according to any one of claims 2 to 7, characterized in that, The width of the second extension (230) is b, where the value of b ranges from 1 mm to 3 mm.

9. The FPC cable structure according to any one of claims 1 to 7, characterized in that, The length of the first extension (220) is c, where the value of c ranges from 1.5mm to 3mm.

10. The FPC cable structure according to any one of claims 1 to 7, characterized in that, The first extension (220) and the connecting part (210) are arranged at an angle to each other, and the opening of the angle faces away from the cable body (100).

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