FPC (Flexible Printed Circuit) structure for improving wrinkles in bending area

Abstract

The embodiment of the utility model belongs to the technical field of FPC. The utility model also relates to an FPC structure for improving the folds of the bending area, which comprises an FPC main body, the FPC main body is provided with the bending area, the FPC main body comprises an FPC film coating layer, one side of the FPC film coating layer is provided with a plurality of film coating layer material drawing-out ports, and the film coating layer material drawing-out ports are located in the bending area. According to the invention, the part, corresponding to the bending area, of the FPC film coating layer is subjected to material drawing and segmentation processing to form the film coating layer material drawing ports, and the intervals with certain widths are reserved among the film coating layer material drawing ports, so that the problem of wrinkles of the bending area is effectively solved, the stress concentration of the FPC film coating layer during bending can be reduced through the segmented material drawing mode, and the bending quality of the FPC film coating layer is improved. And meanwhile, the intervals reserved among the material digging openings of the film covering layer do not affect the bending performance, and the effects of supporting and stabilizing the bending area can be achieved.

Description

Technical Field

[0001] This utility model relates to the field of FPC technology, and more specifically, to an FPC structure that improves wrinkles in the bending area. Background Technology

[0002] In existing flexible printed circuit board (FPC) manufacturing processes, the treatment of the bending area is particularly critical, as it directly affects the bonding accuracy and overall performance of the FPC. To effectively soften the bending area, the industry typically performs a material removal process on the cover film on the front side of the bending area. This step aims to reduce the obstruction of the cover film during the bending process, allowing the FPC to bend more smoothly. At the same time, to further enhance the softening effect of the bending area, a layer of thermosetting green oil is brushed on the cover film on the back side of the bending area after material removal. Thermosetting green oil has good flexibility and adhesion. After curing, it can form a protective film, which can prevent the bending area from being corroded by the external environment and can also increase the flexibility of the bending area to a certain extent.

[0003] However, when the width of the FPC is large, traditional cover film removal methods reveal some problems, especially when removing large areas of cover film. Wrinkles easily form in the bending area during bending, affecting not only the FPC's appearance but, more importantly, reducing its bonding accuracy and potentially causing poor circuit connections, thus impacting the overall performance of the electronic product. Therefore, we propose an improvement to this problem, creating an FPC structure that mitigates wrinkles in the bending area. Utility Model Content

[0004] The technical problem to be solved by this utility model embodiment is that when a large area of ​​cover film needs to be scooped out, wrinkles easily appear in the bending area during the bending process.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0006] An FPC structure for improving wrinkles in the bending area includes: an FPC body having a bending area, the FPC body including an FPC coating layer, and a plurality of coating layer outlets being provided on one side of the FPC coating layer, the coating layer outlets being located in the bending area.

[0007] As an improvement of this utility model, the distance between the material outlets of two adjacent coating layers is 0.8-1mm.

[0008] As an improvement of this utility model, a thermosetting green oil body is provided on the side of the FPC coating layer away from the coating layer feed port.

[0009] As an improvement of this utility model, the FPC body further includes an FPC base film layer disposed within the FPC coating layer, and a second copper foil layer is disposed on one side of the FPC base film layer.

[0010] As an improvement of this utility model, the FPC coating layer has a first window on the side near the second copper foil layer, and a first gold finger connected to the second copper foil layer is provided in the first window.

[0011] As an improvement of this utility model, a first reinforcing plate is provided on the side of the FPC coating layer away from the first gold finger, and the position of the first reinforcing plate corresponds to the position of the first gold finger.

[0012] As an improvement of this utility model, a first copper foil layer is provided on the side of the FPC base film layer away from the FPC coating layer.

[0013] As an improvement of this utility model, the FPC coating layer has a second window on the side near the first copper foil layer, and a second gold finger connected to the first copper foil layer is provided in the second window.

[0014] As an improvement of this utility model, a second reinforcing plate is provided on the side of the FPC coating layer away from the second gold finger, and the position of the second reinforcing plate corresponds to the position of the second gold finger.

[0015] As an improvement of this utility model, a third window is provided on the side of the FPC coating layer near the second copper foil layer, and an FPC pad connected to the second copper foil layer is provided in the third window.

[0016] Compared with the prior art, the embodiments of this utility model have the following main advantages:

[0017] To address the problem of wrinkles easily forming in the bending area during bending when large areas of the FPC coating layer need to be removed from the film in existing technologies, this application segments the removal process of the corresponding bending area of ​​the FPC coating layer to form several removal ports, and maintains a certain width of gap between the removal ports. This effectively solves the problem of wrinkles in the bending area. This segmented removal method can reduce stress concentration in the FPC coating layer during bending and avoid wrinkles caused by large-area removal. At the same time, the gap between the removal ports does not affect the bending performance and can also support and stabilize the bending area. Attached Figure Description

[0018] Figure 1 A schematic diagram of the FPC structure for improving wrinkles in the bending area provided in this application;

[0019] Figure 2A rear view schematic diagram of the FPC structure for improving wrinkles in the bending area provided in this application;

[0020] Figure 3 A side sectional view of the FPC structure for improving wrinkles in the bending area provided in this application.

[0021] The image shows:

[0022] 1. FPC body; 101. FPC coating layer; 102. FPC base film layer; 103. First copper foil layer; 104. Second copper foil layer; 105. First gold finger; 106. First reinforcing plate; 107. Second gold finger; 108. Second reinforcing plate; 109. FPC pad;

[0023] 2. Coated layer material outlet;

[0024] 3. Thermosetting green oil base. Detailed Implementation

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs; the terminology used herein in the specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The reference herein to "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the invention. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0026] As described in the background section, when the width of the FPC is large, the traditional cover film removal process reveals some problems. In particular, when large areas of cover film need to be removed, wrinkles are prone to appear in the bending area during the bending process. These wrinkles not only affect the appearance quality of the FPC, but more importantly, they reduce its bonding accuracy and may even lead to poor circuit connection, thereby affecting the performance of the entire electronic product.

[0027] To solve this technical problem, this utility model provides an FPC structure that improves wrinkles in the bending area.

[0028] For details, please refer to Figure 1-Figure 3 The FPC structure that improves wrinkles in the bending area specifically includes:

[0029] FPC body 1, FPC body 1 has a bending area, FPC body 1 includes FPC coating layer 101, and a plurality of coating layer discharge ports 2 are opened on one side of FPC coating layer 101, and the coating layer discharge ports 2 are located in the bending area.

[0030] The FPC structure for improving wrinkles in the bending area provided by this utility model solves the problem of wrinkles in the bending area by segmenting the portion of the FPC coating layer 101 corresponding to the bending area to form several coating layer outlets 2, and maintaining a certain width of gap between the several coating layer outlets 2. This segmented material removal method can reduce the stress concentration of the FPC coating layer 101 during bending and avoid wrinkles caused by large-area material removal. At the same time, the gap between the several coating layer outlets 2 does not affect the bending performance and can also play a role in supporting and stabilizing the bending area.

[0031] To enable those skilled in the art to better understand the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0032] It should be noted that, unless otherwise specified, the embodiments and features and technical solutions in the present invention can be combined with each other.

[0033] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0034] Embodiment 1 of the FPC structure for improving wrinkles in the bending area according to this utility model

[0035] Please refer to Figure 1-Figure 3 This utility model relates to an FPC structure for improving wrinkles in the bending area, comprising: an FPC body 1, the FPC body 1 having a bending area, the FPC body 1 including an FPC coating layer 101, and a plurality of coating layer ejection ports 2 being provided on one side of the FPC coating layer 101, the coating layer ejection ports 2 being located in the bending area; this application effectively solves the problem of wrinkles in the bending area by segmenting the ejection portion of the FPC coating layer 101 corresponding to the bending area to form a plurality of coating layer ejection ports 2, and maintaining a certain width of gap between the plurality of coating layer ejection ports 2. This segmented ejection method can reduce the stress concentration of the FPC coating layer 101 during bending, and avoid wrinkles caused by large-area ejection. At the same time, the gap maintained between the plurality of coating layer ejection ports 2 does not affect the bending performance, and can also play a role in supporting and stabilizing the bending area;

[0036] This is because the segmented feeding method of the several coating layer feeding ports 2 allows the stress to be evenly distributed along the intervals between the various coating layer feeding ports 2 during the bending process of the FPC body 1, rather than being concentrated in one place. This reduces the stress concentration of the FPC coating layer 101. Furthermore, the intervals between the several coating layer feeding ports 2 provide a certain degree of flexibility for bending and also play a role in supporting and stabilizing the bending area, ensuring that the FPC body 1 can maintain good shape and performance after repeated bending.

[0037] Furthermore, the distance between the material outlets 2 of two adjacent coating layers is 0.8-1mm.

[0038] Further, such as Figure 2 and Figure 3 As shown, a thermosetting green varnish body 3 is provided on the side of the FPC coating layer 101 away from the coating layer feed port 2. The thermosetting green varnish body 3 can effectively isolate external moisture, dust and chemicals from corroding the FPC body 1, protecting the internal circuit structure of the FPC body 1 from damage. At the same time, it also has a certain degree of hardness and wear resistance, which can reduce the damage to the surface of the FPC body 1 caused by friction, scratches and other factors during daily use, thereby extending the service life of the FPC body 1 and ensuring the long-term stability of its electrical performance. This is because thermosetting green varnish has good insulation and protective properties. After the thermosetting green varnish body 3 is provided on the surface of the FPC coating layer 101, a strong protective film is formed, which can prevent the direct contact of corrosive substances such as moisture, oxygen, acids and alkalis in the external environment with the FPC coating layer 101, thereby avoiding the corrosion and oxidation of the FPC coating layer 101 by these substances. In addition, the thermosetting green varnish has high hardness and can withstand a certain degree of friction and scratches, providing additional mechanical protection for the FPC coating layer 101.

[0039] Embodiment 2 of the FPC structure for improving wrinkles in the bending area according to this utility model

[0040] This utility model further improves the FPC structure that reduces wrinkles in the bending area, such as... Figure 3 As shown, the FPC body 1 also includes an FPC base film layer 102 disposed within the FPC coating layer 101, and a second copper foil layer 104 disposed on one side of the FPC base film layer 102. The FPC base film layer 102, as the core structural layer of the FPC body 1, has high strength and flexibility, and can withstand certain mechanical stresses such as tension and bending. At the same time, it provides a stable platform for the attachment of other components. The second copper foil layer 104 provides a key conductive medium for the FPC body 1 to realize the circuit conduction function, so that the current can be stably transmitted inside the FPC body 1, which meets the requirements of electronic equipment for signal transmission and power supply.

[0041] This is because: the FPC base film layer 102 is the main structural part of the FPC body 1. Its material and structural characteristics determine the basic mechanical properties of the FPC body 1. It has a certain thickness and strength, which can support the entire FPC body 1. It is not easy to break or be damaged during bending and other operations. The second copper foil layer 104 has good conductivity and can be wired according to the circuit design requirements to realize the transmission and distribution of electronic signals, so that the FPC body 1 can play its due role in electronic devices.

[0042] Further, such as Figure 1 and Figure 3 As shown, the FPC coating layer 101 has a first window on the side near the second copper foil layer 104. The first window is provided with a first gold finger 105 that is connected to the second copper foil layer 104. The first gold finger 105 serves as the interface between the FPC body 1 and external devices. Its design enables the FPC body 1 to accurately match the corresponding interfaces of other electronic components, ensuring stable signal transmission at the connection point and reducing the possibility of signal loss and interference.

[0043] A gold finger is a standardized electronic connector interface with specific dimensions and shapes. A first opening is made on the FPC coating layer 101 and a first gold finger 105 is provided, so that it can fit tightly with the gold finger slot or other connection interface of the external device. Through this precise connection method, the signal can be transmitted quickly and accurately between the FPC body 1 and the external device, avoiding signal distortion or interruption caused by poor connection. Moreover, this design conforms to the standardized process of electronic equipment assembly, making it easier to plug and unplug the FPC body 1 during production and maintenance, thus improving work efficiency.

[0044] Further, such as Figure 2 and Figure 3As shown, a first reinforcing plate 106 is provided on the side of the FPC coating layer 101 away from the first gold finger 105. The position of the first reinforcing plate 106 corresponds to the position of the first gold finger 105. The first reinforcing plate 106 provides additional support and protection for the first gold finger 105, enabling the first gold finger 105 to withstand greater insertion and extraction forces and external impacts, reducing the probability of problems such as gold finger breakage, detachment, or poor contact caused by frequent insertion and extraction or accidental collisions; because the first gold finger 105 is located at the connection between the FPC body 1 and the external device. It plays a key role in the process, but because its structure is relatively thin and protruding, it is easily affected by external forces. Setting the first reinforcing plate 106 can increase the strength and rigidity of this part, and disperse the insertion and extraction forces and external forces on the first gold finger 105. The first reinforcing plate 106 is usually made of high-strength materials, such as metal or hard plastic, which is tightly bonded to the FPC coating layer 101 and can effectively transmit and withstand external forces, thereby protecting the first gold finger 105 from damage and ensuring that the connection between the FPC body 1 and the external equipment always remains stable and reliable.

[0045] Embodiment 3 of the FPC structure for improving wrinkles in the bending area according to this utility model

[0046] This utility model further improves the FPC structure that reduces wrinkles in the bending area, such as... Figure 3 As shown, a first copper foil layer 103 is provided on the side of the FPC base film layer 102 away from the FPC coating layer 101. By providing the first copper foil layer 103 and the second copper foil layer 104 on both sides of the FPC base film layer 102 respectively, more complex circuit designs can be achieved, increasing the number and density of signal transmission lines, thereby improving the integration and performance of the FPC body 1. At the same time, the double-layer copper foil structure can also be used for layered wiring according to different circuit requirements, reducing interference between signals and improving signal quality and stability. The double-layer copper foil structure can also improve the heat dissipation performance of the FPC body 1, because copper has good thermal conductivity and can dissipate the heat generated by the FPC body 1 during operation more quickly, thereby ensuring the stability and reliability of the FPC body 1 during long-term operation.

[0047] Further, such as Figure 2 and Figure 3 As shown, the FPC coating layer 101 has a second window on the side near the first copper foil layer 103. The second window has a second gold finger 107 connected to the first copper foil layer 103. The second gold finger 107 increases the number of interfaces for the FPC body 1 to connect with external devices, so that the FPC body 1 can connect and communicate with multiple different electronic components at the same time, and realize richer functions.

[0048] Further, such as Figure 3As shown, a second reinforcing plate 108 is provided on the side of the FPC coating layer 101 away from the second gold finger 107. The position of the second reinforcing plate 108 corresponds to the position of the second gold finger 107. The second reinforcing plate 108 can withstand various stresses from insertion and removal operations and the external environment, protect the second gold finger 107 from damage, and ensure good contact and stable connection between it and external equipment. At the same time, the second reinforcing plate 108 can also reduce the impact of bending or deformation of the FPC body 1 itself on the second gold finger 107, thereby improving the overall structural stability of the FPC body 1.

[0049] Further, such as Figure 1 As shown, the FPC coating layer 101 has a third opening on the side near the second copper foil layer 104, and the third opening has an FPC pad 109 connected to the second copper foil layer 104. The FPC pad 109 provides a dedicated area for soldering, which makes it easier and more accurate to connect the FPC body 1 to other components by soldering when assembling electronic devices. This connection method has high reliability and conductivity, and can ensure stable transmission of signals and current.

[0050] In the production process of electronic devices, soldering is a common connection method. The FPC pad 109 is set in accordance with the requirements of the soldering process. It has a certain size and shape and can be well matched with soldering tools and soldering materials. By opening a third window on the FPC coating layer 101 and setting the FPC pad 109, the pins or solder ends of the FPC body 1 and other electronic components can be accurately aligned and soldered.

[0051] Obviously, the embodiments described above are only some embodiments of this utility model, not all embodiments. The accompanying drawings show preferred embodiments of this utility model, but do not limit the patent scope of this utility model. This utility model can be implemented in many different forms; rather, the purpose of providing these embodiments is to provide a more thorough and comprehensive understanding of the disclosure of this utility model. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing specific embodiments, or make equivalent substitutions for some of the technical features. Any equivalent structures made using the content of this utility model specification and drawings, directly or indirectly applied to other related technical fields, are similarly within the patent protection scope of this utility model.

Claims

1. An FPC structure for improving wrinkles in the bending area, characterized in that, include: FPC body (1), the FPC body (1) has a bending area, the FPC body (1) includes an FPC coating layer (101), and a plurality of coating layer outlets (2) are provided on one side of the FPC coating layer (101), and the coating layer outlets (2) are located in the bending area.

2. The FPC structure for improving wrinkles in the bending area according to claim 1, characterized in that, The distance between the material outlets (2) of two adjacent coating layers is 0.8-1mm.

3. The FPC structure for improving wrinkles in the bending area according to claim 1, characterized in that, The FPC coating layer (101) has a thermosetting green oil body (3) on the side away from the coating layer feed port (2).

4. The FPC structure for improving wrinkles in the bending area according to claim 1, characterized in that, The FPC body (1) also includes an FPC base film layer (102) disposed within the FPC coating layer (101), and a second copper foil layer (104) is disposed on one side of the FPC base film layer (102).

5. The FPC structure for improving wrinkles in the bending area according to claim 4, characterized in that, The FPC coating layer (101) has a first window on the side near the second copper foil layer (104), and a first gold finger (105) connected to the second copper foil layer (104) is provided in the first window.

6. The FPC structure for improving wrinkles in the bending area according to claim 5, characterized in that, The FPC coating layer (101) has a first reinforcing plate (106) on the side away from the first gold finger (105), and the position of the first reinforcing plate (106) corresponds to the position of the first gold finger (105).

7. The FPC structure for improving wrinkles in the bending area according to claim 6, characterized in that, The FPC base film layer (102) has a first copper foil layer (103) on the side away from the FPC coating layer (101).

8. The FPC structure for improving wrinkles in the bending area according to claim 7, characterized in that, The FPC coating layer (101) has a second window on the side near the first copper foil layer (103), and a second gold finger (107) connected to the first copper foil layer (103) is provided in the second window.

9. The FPC structure for improving wrinkles in the bending area according to claim 8, characterized in that, A second reinforcing plate (108) is provided on the side of the FPC coating layer (101) away from the second gold finger (107), and the position of the second reinforcing plate (108) corresponds to the position of the second gold finger (107).

10. The FPC structure for improving wrinkles in the bending area according to claim 9, characterized in that, The FPC coating layer (101) has a third opening on the side near the second copper foil layer (104), and the third opening has an FPC pad (109) connected to the second copper foil layer (104).

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