Flexible flat wire

Abstract

The utility model discloses a flexible flat wire, which comprises a conductor layer, an adhesive layer and two insulating layers, the conductor layer comprises a main body part and an exposed part which are connected with each other, the two insulating layers are symmetrically coated on the upper surface and the lower surface of the main body part, the exposed part comprises a connecting part and a front end part, and the front end part is connected with the main body part. One end of the connecting part is connected with the main body part, the other end of the connecting part is connected with the front end part, and the adhesive layer is arranged on the front end part. According to the utility model, the adhesive layer is arranged at the front end of the exposed part of the conductor layer, and the front end part is protected by the adhesive layer, so that the deformation in the transportation and plugging process is reduced, and the pin warping or deformation condition is prevented.

Description

Technical Field

[0001] This utility model relates to the field of electronic wire technology, and in particular to a flexible flat wire. Background Technology

[0002] In the field of electronic wires, flexible flat cables are widely used in high-precision applications such as signal transmission within equipment and connection of precision electronic components due to their thinness and flexibility. Traditional flexible flat cables typically employ a structure design where two layers of polyethylene (PE) film are bonded to a metal conductor, and the process is carried out through thermoforming. However, this structure has certain drawbacks in practical applications: due to insufficient interfacial bonding strength between the PE film and the metal conductor, the pins at the gold fingers are prone to warping or deformation during transportation or frequent connector insertion and removal. This mechanical damage not only causes poor overall contact of the circuit, but also, due to the irreversible deformation characteristics of PE material, the defective areas are difficult to repair, ultimately leading to a significant reduction in product reliability. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a flexible flat wire to solve the problem that the gold finger front pins of existing flexible flat wires are prone to warping or deformation.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows: a flexible flat wire, which includes a conductor layer, an adhesive layer and two insulating layers. The conductor layer includes a main body part and an exposed part connected to each other. The two insulating layers symmetrically cover the upper and lower surfaces of the main body part. The exposed part includes a connecting part and a front end part. One end of the connecting part is connected to the main body part, and the other end of the connecting part is connected to the front end part. The adhesive layer is disposed on the front end part.

[0005] Furthermore, the flexible flat wire described in this utility model also includes a reinforcing plate. The reinforcing plate includes a first reinforcing part and a second reinforcing part connected to each other. The first reinforcing part covers the insulating layer, and the second reinforcing part covers the exposed part. The second reinforcing part is located on the side of the exposed part away from the adhesive layer.

[0006] Furthermore, in the flexible flat line described in this utility model, the thickness of the first reinforcing part in the vertical height direction is less than the thickness of the second reinforcing part in the vertical height direction, so as to form a stepped reinforcing plate.

[0007] Furthermore, in the flexible flat wire described in this utility model, the thickness of the second reinforcing part is the sum of the thickness of the first reinforcing part and the thickness of the insulating layer.

[0008] Furthermore, the flexible flat line described in this utility model includes two reinforcing plates, which are symmetrically arranged.

[0009] Furthermore, in the flexible flat wire described in this utility model, the conductor layer includes a plurality of flat conductors arranged side by side, with a spacing between adjacent conductors.

[0010] Furthermore, the flexible flat line described in this utility model includes two exposed portions, which are located at both ends of the main body.

[0011] Furthermore, in the flexible flat line described in this utility model, the adhesive layer is made of polyvinyl chloride.

[0012] Furthermore, in the flexible flat line described in this utility model, the width L of the adhesive layer in the first direction is: 0.7mm≤L≤0.8mm, and the thickness d1 of the adhesive layer in the vertical height direction is 0.29mm.

[0013] Furthermore, in the flexible flat wire described in this utility model, the thickness d2 of the insulating layer is 0.32 mm, and the material of the insulating layer is polyvinyl chloride.

[0014] The beneficial effects of this invention are as follows: This invention provides a flexible flat cable with adhesive at the tip of the gold finger to protect the tip of the gold finger and prevent pin warping or deformation. Specifically, this invention divides the conductor layer into a main body and an exposed part (i.e., the gold finger). The exposed part is the portion of the conductor layer that extends beyond two insulating layers. An adhesive layer is provided at the tip of this exposed part (i.e., the front end), which protects the front end and reduces deformation during transportation and insertion / removal, thus solving the problem of pin warping at the tip of the gold finger. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the flexible flat line described in this utility model from one perspective in one embodiment.

[0016] Figure 2 This is a cross-sectional schematic diagram from one perspective in one embodiment of the flexible flat line described in this utility model.

[0017] Figure 3 for Figure 2 A partial schematic diagram of the flexible flat line shown.

[0018] Label Explanation:

[0019] 1. Conductor layer; 11. Main body; 12. Exposed part; 13. Connecting part; 14. Front end;

[0020] 2. Insulating layer; 21. First insulating layer; 22. Second insulating layer;

[0021] 3. Reinforcing plate; 31. First reinforcing part; 32. Second reinforcing part;

[0022] 4. Adhesive layer. Detailed Implementation

[0023] To explain in detail the technical content, objectives, and effects of this utility model, the following description is provided in conjunction with the embodiments and accompanying drawings.

[0024] Please refer to Figures 1 to 3 This utility model discloses a flexible flat wire made of PVC plastic material with an outer metal conductor. It includes a conductor layer 1, an adhesive layer 4, and two insulating layers 2. The conductor layer 1 includes a main body 11 and an exposed part 12 connected to each other. The two insulating layers 2 symmetrically cover the upper and lower surfaces of the main body 11. The exposed part 12 includes a connecting part 13 and a front end 14. One end of the connecting part 13 is connected to the main body 11, and the other end of the connecting part 13 is connected to the front end 14. The adhesive layer 4 is disposed on the front end 14.

[0025] As can be seen from the above description, the beneficial effects of this utility model are as follows: This utility model provides a flexible flat wire with adhesive at the tip of the gold finger to protect the tip of the gold finger and prevent the pins from warping or deforming. Specifically, this utility model divides the conductor layer 1 into a main body 11 and an exposed part 12 (i.e., the gold finger). The exposed part 12 is the end of the conductor layer 1 that extends beyond the two insulating layers 2. An adhesive layer 4 is provided at the tip of the exposed part 12 (i.e., the front end 14). The adhesive layer 4 protects the front end 14 to reduce deformation during transportation and insertion / removal, thus solving the problem of the gold finger tip warping.

[0026] The gold finger refers to the conductive area at one end of a flexible flat wire that is used to directly contact a connector (such as a ZiF connector). It can serve as an interface for signal transmission and conductivity, and is used to connect devices at end A and end B (such as cameras, printer scanning lines, etc.). In this utility model, the gold finger is the exposed part 12 of the conductor layer 1.

[0027] Furthermore, the flexible flat line described in this utility model also includes a reinforcing plate 3. The reinforcing plate 3 includes a first reinforcing part 31 and a second reinforcing part 32 connected to each other. The first reinforcing part 31 covers the insulating layer 2, and the second reinforcing part 32 covers the exposed part 12. The second reinforcing part 32 is located on the side of the exposed part 12 that is away from the adhesive layer 4.

[0028] In practical applications, this invention improves the processing method of the reinforcing plate 3. The traditional method involves directly punching holes in the PE-based flexible line using a punching die to complete the bonding of the reinforcing plate 3. In contrast, this invention uses a peeling process on a PVC-based flexible line to extrude the PVC outer material forward and precisely removes the excess portion at the cutting station, achieving a hole-free bonding of the reinforcing plate 3.

[0029] As described above, by setting up a corresponding reinforcing plate 3 to cover the lower surface of the exposed end and part of the lower surface of the second insulation layer 22, the mechanical strength and stability of the key parts are enhanced, and deformation is reduced.

[0030] Furthermore, in the flexible flat line described in this utility model, the thickness of the first reinforcing part 31 in the vertical height direction is less than the thickness of the second reinforcing part 32 in the vertical height direction, so as to form a stepped reinforcing plate 3.

[0031] As described above, the reinforcing plate 3 is designed in a stepped shape, thereby adapting the connector insertion and extraction strength requirements through different thickness areas (the first reinforcing part 31 is thin and the second reinforcing part 32 is thick) (for example, the thicker area provides higher support).

[0032] Furthermore, in the flexible flat wire described in this utility model, the thickness of the second reinforcing part 32 is the sum of the thickness of the first reinforcing part 31 and the thickness of the insulating layer 2.

[0033] Furthermore, the flexible flat line described in this utility model includes two reinforcing plates 3, which are symmetrically arranged.

[0034] Furthermore, in the flexible flat wire described in this utility model, the conductor layer 1 includes a plurality of flat conductors arranged side by side, with a gap between adjacent conductors.

[0035] Furthermore, the flexible flat line described in this utility model includes two exposed portions 12, which are respectively located at both ends of the main body portion 11.

[0036] Furthermore, in the flexible flat line described in this utility model, the adhesive layer 4 is made of polyvinyl chloride (PVC).

[0037] Furthermore, in the flexible flat line described in this utility model, the width L of the adhesive layer 4 in the first direction is 0.7mm ≤ L ≤ 0.8mm, and the thickness d1 of the adhesive layer 4 in the vertical height direction is 0.29mm. It should be noted that the aforementioned first direction refers to the horizontal length direction of the flexible flat line.

[0038] Furthermore, in the flexible flat wire described in this utility model, the thickness d2 of the insulation layer 2 can be approximately 0.32 mm. If it is 0.32 mm, the material of the insulation layer 2 is polyvinyl chloride. In practical applications, the manufacturing process for preparing the flexible flat wire is as follows: after melting PVC plastic granules at high temperature, the conductor is directly extruded through a mold to form an integrated insulation layer 2 encapsulation structure.

[0039] As described above, this utility model changes the insulation layer 2 from the traditional PE film to a PVC outer sheath material. The advantages of doing so are: (1) By using a PVC outer sheath material as the insulation layer 2, the flexible flat cable can be applied to more scenarios, such as in moving parts such as cameras, printer scanning lines, and smart door locks. (2) By using a PVC outer sheath material as the insulation layer 2, the service life of the cable can be increased. For example, a flexible flat cable made of traditional PE film can be bent 300,000 times, while a flexible flat cable made of PVC plastic granules can be bent up to 600,000 times, thus extending the service life of the equipment. (3) It can replace some of the traditional LVDS (coaxial cable) and some FPC, thereby reducing the customer's manufacturing costs. (4) The pH value of the flexible flat cable with a PVC outer sheath material is 0.5 + / - 0.05 mm, which is suitable for ZiF connectors, saves space, is easy to assemble, can be directly plugged in and out, does not require soldering, and easily solves electromagnetic shielding. (5) Samples of flexible flat PVC outer material can be supplied within 3 days and finished products can be delivered in large quantities in 2-3 weeks. Compared with the traditional FPC line customization and mold opening, it has the characteristics of short production cycle, flexible production and low cost.

[0040] Please refer to Figures 1 to 3 Embodiment 1 of this utility model is: a flexible flat wire, including a conductor layer 1, a reinforcing plate 3, an adhesive layer 4, and two insulating layers 2 (i.e., a first insulating layer 21 and a second insulating layer 22), as shown below. Figure 2 As shown, the flexible flat line includes, from top to bottom, a first insulating layer 21, a conductor layer 1, and a second insulating layer 22. In the horizontal length direction of the flexible flat line, the length of the conductor layer 1 is greater than the lengths of the first insulating layer 21 and the second insulating layer 22. Therefore, both ends of the conductor layer 1 extend beyond the two insulating layers 2 to form exposed ends. The portion of the conductor layer 1 covered by the first insulating layer 21 and the second insulating layer 22 constitutes the main body 11. Figure 2 as well as Figure 3 As shown, the exposed portion 12 includes a connecting portion 13 and a front portion 14. One end of the connecting portion 13 is connected to the main body portion 11, and the other end of the connecting portion 13 is connected to the front portion 14. The adhesive layer 4 is disposed on the upper surface of the front portion 14.

[0041] In this embodiment, the conductor layer 1 is composed of multiple flat metal conductors arranged side by side, with spacing between adjacent conductors. Two insulating layers 2 extend from both ends of the conductor layer 1 to form exposed ends. In this embodiment, the insulating layer 2 comprises two layers of equal thickness, both made of PVC. The first insulating layer 21 covers the upper surface of the conductor layer 1, and the second insulating layer 22 covers the lower surface of the conductor layer 1. During production, the insulating layer 2 is integrally formed with the conductor layer 1 through a high-temperature extrusion process; that is, the production process involves directly extruding the conductor directly through a mold after the PVC plastic granules have melted at high temperature.

[0042] In this embodiment, there are two reinforcing plates 3, located at both ends of the flexible flat wire. Each reinforcing plate 3 includes a first reinforcing part 31 and a second reinforcing part 32. The first reinforcing part 31 covers the lower surface of the second insulating layer 22, and the second reinforcing part 32 covers the lower surface of the exposed end of the conductor layer 1. The thicknesses of the first reinforcing part 31 and the second reinforcing part 32 differ in a stepped manner, wherein the thickness of the second reinforcing part 32 is the sum of the thickness of the first reinforcing part 31 and the thickness of the single-layer insulating layer 2.

[0043] In summary, the flexible flat cable provided by this utility model: (1) By using PVC outer sheath material as insulation layer 2, the flexible flat cable can be applied to more scenarios, such as for moving parts such as cameras, printer scanning lines, and smart door locks. (2) By using PVC outer sheath material as insulation layer 2, the service life of the cable can be increased. For example, the flexible flat cable made of traditional PE film can be bent 300,000 times, while the flexible flat cable made of PVC plastic granules can be bent up to 600,000 times, thus extending the service life of the equipment. (3) It can replace some traditional LVDS (coaxial cables) and some FPC, thereby reducing the customer's manufacturing costs. (4) The thickness of the flexible flat cable with PVC outer sheath material can be 0.3mm, pH value 0.5+ / -0.05mm, suitable for ZiF connectors, saving space, easy to assemble, direct plug-in and unplugging, no soldering required, and easy to solve electromagnetic shielding. (5) Samples of flexible flat cables with PVC outer sheath material can be supplied within 3 days, and finished products can be delivered in large quantities in 2-3 weeks. Compared with the traditional custom mold opening of FPC cables, it has the characteristics of short production cycle, flexible production and low cost. (6) Flexible flat cables without adhesive at the front end may have the gold fingers lifting pins during transportation and connector insertion and removal, resulting in the overall defect of the cable and making it unrepairable. This utility model uses PVC plastic granules to prepare flexible flat cables and leaves an adhesive layer 4 at the front end of the gold fingers to protect the front end of the gold fingers and prevent them from lifting pins.

[0044] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent modifications made based on the content of this utility model specification and drawings, or direct or indirect applications in related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A flexible flat wire, characterized in that, It includes a conductor layer, an adhesive layer, and two insulating layers. The conductor layer includes a main body portion and an exposed portion connected to each other. The two insulating layers symmetrically cover the upper and lower surfaces of the main body portion. The exposed portion includes a connecting portion and a front end portion. One end of the connecting portion is connected to the main body portion, and the other end of the connecting portion is connected to the front end portion. The adhesive layer is disposed on the front end portion.

2. The flexible flat wire according to claim 1, characterized in that, It also includes a reinforcing plate, which includes a first reinforcing part and a second reinforcing part connected to each other. The first reinforcing part covers the insulating layer, and the second reinforcing part covers the exposed part. The second reinforcing part is located on the side of the exposed part away from the adhesive layer.

3. The flexible flat line according to claim 2, characterized in that, The thickness of the first reinforcing part in the vertical height direction is less than the thickness of the second reinforcing part in the vertical height direction, so as to form a stepped reinforcing plate.

4. The flexible flat line according to claim 3, characterized in that, The thickness of the second reinforcing part is the sum of the thickness of the first reinforcing part and the thickness of the insulating layer.

5. The flexible flat wire according to claim 2, characterized in that, It includes two reinforcing plates, which are arranged symmetrically.

6. The flexible flat wire according to claim 1, characterized in that, The conductor layer comprises a plurality of flat conductors arranged side by side, with a spacing between adjacent conductors.

7. The flexible flat line according to claim 1, characterized in that, It includes two exposed portions, which are located at opposite ends of the main body.

8. The flexible flat line according to claim 1, characterized in that, The adhesive layer is made of polyvinyl chloride.

9. The flexible flat line according to claim 1, characterized in that, The width L of the adhesive layer in the first direction is 0.7mm≤L≤0.8mm, and the thickness d1 of the adhesive layer in the vertical height direction is 0.29mm.

10. The flexible flat wire according to claim 1, characterized in that, The thickness d2 of the insulating layer is 0.32 mm, and the material of the insulating layer is polyvinyl chloride.

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