Firm three-in-one laminated combination structure formed by integral injection molding of diaphragm and upper and lower layer structures

Abstract

The utility model provides a firm three-in-one laminated combination structure in which a diaphragm and an upper-layer structure and a lower-layer structure are subjected to integral injection molding, the firm three-in-one laminated combination structure comprises a workpiece body and a flexible circuit diaphragm, the flexible circuit diaphragm is fixedly arranged on the workpiece body, the workpiece body is fixedly connected with a pressing plate through a connecting part, the flexible circuit diaphragm is provided with a through hole, and the connecting part passes through the through hole. According to the utility model, the flexible circuit diaphragm is provided with the through hole, the workpiece body is fixedly connected with the pressing plate through the connecting part, and the connecting part passes through the through hole, so that the pressing plate is pressed and covered on the bonding junction of the workpiece body and the flexible circuit diaphragm; and the bonding junction of the workpiece body and the flexible circuit diaphragm cannot be torn, so that an electric circuit at the bonding junction of the workpiece body and the flexible circuit diaphragm is prevented from being broken, and the processing yield is improved.

Description

Technical Field

[0001] This utility model belongs to the field of flexible circuit board technology, specifically relating to a robust three-in-one laminated structure that integrates a diaphragm and upper and lower layer structures through injection molding. Background Technology

[0002] Flexible circuit boards, also known as flexible circuit films, are high-performance printed circuit boards made from flexible substrates such as polyester, polycarbonate, and polyimide, manufactured through a series of complex processes. They possess numerous advantages, including high reliability, excellent flexibility, high wiring density, light weight, and thinness.

[0003] In some applications, flexible circuit boards (PCBs) need to be fixed to the workpiece using adhesives to ensure the stability of the PCB installation. However, while the circuit lines on the surface of the PCB are firmly bonded to the workpiece, the line busbars (used to connect other circuit busbars) are not bonded to the workpiece. This facilitates the connection of the line busbars to other circuits. During operation, the line busbars need to be bent to facilitate connection, but the bending process can tear the PCB bonded to the workpiece, causing the circuit lines at the bonding interface to break, thus affecting the yield rate of the finished product. Utility Model Content

[0004] The purpose of this invention is to provide a robust three-in-one laminated structure that integrates a diaphragm and upper and lower layer structures through injection molding, in order to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a robust three-in-one laminated structure integrally injection molded with a diaphragm and upper and lower layer structures, comprising a workpiece body and a flexible circuit diaphragm, wherein the flexible circuit diaphragm is fixedly mounted on the workpiece body, and a pressure plate is fixedly connected to the workpiece body through a connecting part, wherein the flexible circuit diaphragm is provided with a through hole, and the connecting part passes through the through hole.

[0006] Preferably, the connecting part and the workpiece body are integrally injection molded structures.

[0007] Preferably, the connecting part and the pressure plate are integrally injection molded structures.

[0008] Preferably, the workpiece body is fixedly connected to the flexible circuit diaphragm by an adhesive.

[0009] Preferably, the pressure plate is fixedly connected to the flexible circuit diaphragm by an adhesive.

[0010] Preferably, the pressure plate is fixedly connected to the connecting part through a secondary injection molding process.

[0011] Preferably, the pressure plate is fixedly connected to the connecting part by bolts.

[0012] Preferably, the pressure plate is fixedly connected to the connecting part by a snap-fit ​​mechanism.

[0013] Preferably, the pressure plate is fixedly connected to the connecting part by welding.

[0014] Preferably, the pressure plate is provided with functional components, which are hook structures, reinforcing rib structures, or screw hole pillar structures.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] This invention features a through hole in the flexible circuit diaphragm. A pressure plate is fixedly connected to the workpiece body via a connecting part, with the connecting part passing through the through hole. This allows the pressure plate to press against the bonding interface between the workpiece body and the flexible circuit diaphragm, preventing the wire array of the flexible circuit board from tearing at the bonding interface during bending. This prevents the electrical circuits at the bonding interface from breaking, thereby improving the yield rate of finished products.

[0017] This invention uses a pressure plate to fix the flexible circuit board, thereby securing the electronic components on the flexible circuit board and preventing them from becoming loose. Attached Figure Description

[0018] Figure 1 This is a structural view of the present invention.

[0019] Figure 2 This is a cross-sectional structural view of the first design of this utility model.

[0020] Figure 3 This is a cross-sectional structural view of the second design of this utility model.

[0021] Figure 4 This is a cross-sectional structural view of the third design of this utility model.

[0022] Figure 5 This is a structural view of the hook structure on the pressure plate of this utility model.

[0023] Figure 6 This is a structural view of the pressure plate with reinforcing ribs of this utility model.

[0024] Figure 7 This is a structural view of the screw hole column structure of the pressure plate of this utility model.

[0025] The diagram is labeled as follows: 1. Workpiece body; 2. Flexible circuit diaphragm; 3. Connecting part; 4. Pressure plate; 5. Through hole; 6. Functional component; 7. Hook structure; 8. Reinforcing rib structure; 9. Screw hole post structure. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] Example 1:

[0028] like Figures 1-7 As shown, this utility model provides a robust three-in-one laminated structure with an integrally injection-molded diaphragm and upper and lower layer structures. It includes a workpiece body 1 and a flexible circuit diaphragm 2. The flexible circuit diaphragm 2 is fixedly mounted on the workpiece body 1. A pressure plate 4 is fixedly connected to the workpiece body 1 via a connecting part 3. The flexible circuit diaphragm 2 has a through hole 5, through which the connecting part 3 passes. The connecting part 3 and the workpiece body 1 are integrally injection-molded. The connecting part 3 and the pressure plate 4 are integrally injection-molded. The workpiece body 1 is fixedly connected to the flexible circuit diaphragm 2 by an adhesive. The pressure plate 4 is fixedly connected to the flexible circuit diaphragm 2 by an adhesive. The pressure plate 4 is fixedly connected to the connecting part 3 through a secondary injection molding process. The pressure plate 4 is fixedly connected to the connecting part 3 by bolts. The pressure plate 4 is fixedly connected to the connecting part 3 by a snap-fit ​​method. The pressure plate 4 is fixedly connected to the connecting part 3 by welding. The pressure plate 4 has a functional component 6, which is a hook structure 7, a reinforcing rib structure 8, or a screw hole post structure 9.

[0029] Through the above technical solution, the present invention provides a through hole 5 in the flexible circuit diaphragm 2, and a pressure plate 4 is fixedly connected to the workpiece body 1 through the connecting part 3, and the connecting part 3 passes through the through hole 5, so that the pressure plate 4 presses on the bonding interface between the workpiece body 1 and the flexible circuit diaphragm 2, so that the wire array of the flexible circuit board cannot tear the bonding interface between the workpiece body 1 and the flexible circuit diaphragm 2 during the bending process, thereby preventing the electrical circuit at the bonding interface between the workpiece body 1 and the flexible circuit diaphragm 2 from breaking and improving the processing yield.

[0030] This invention uses a pressure plate 4 to fix the flexible circuit board, thereby securing the electronic components on the flexible circuit board and preventing them from becoming loose.

[0031] Example 2:

[0032] like Figures 1-7 As shown, this utility model mainly includes a workpiece body 1, a flexible circuit diaphragm 2, and a pressure plate 4. The workpiece body 1 serves as the base component, being the object on which the flexible circuit diaphragm 2 is applied, and is used to fix and install the flexible circuit diaphragm 2. The flexible circuit diaphragm 2 is a thin and flexible circuit board with conductive lines and electronic components printed on it. The flexible circuit diaphragm 2 is firmly fixed to the surface of the workpiece body 1 with adhesive, forming a stable circuit layer.

[0033] The flexible circuit diaphragm 2 has multiple through holes 5 as required. The diameter of the through holes 5 is slightly larger than the diameter of the connecting part 3 so that the connecting part 3 can pass through smoothly. The workpiece body 1 is fixedly connected to the pressure plate 4 through the connecting part 3. The connecting part 3 is a slender columnar structure, including a cylinder or a square column, one end of which is connected to the workpiece body 1 or the pressure plate 4, and the middle section passes through the through holes 5 on the flexible circuit diaphragm 2.

[0034] The pressure plate 4 is a flat structure. It is fixed to the workpiece body 1 via the connecting part 3, covering the edge area of ​​the flexible circuit diaphragm 2. The main function of the pressure plate 4 is to press firmly at the bonding interface between the workpiece body 1 and the flexible circuit diaphragm 2, preventing the electrical circuits at this interface from breaking.

[0035] After passing through the through hole 5 of the flexible circuit diaphragm 2, the connecting part 3 is fixedly connected to the pressure plate 4. This connection can be achieved in various ways, such as threaded connection, snap-fit ​​connection or welding.

[0036] Example 3:

[0037] like Figures 1-7 As shown, in the first design, the connecting part 3 and the workpiece body 1 are integrally formed. During the manufacturing process, multiple connecting parts 3 are directly formed on the surface of the workpiece body 1. These connecting parts 3 are columnar and perpendicular to the surface of the workpiece body 1. The height of the connecting part 3 is slightly higher than the thickness of the flexible circuit diaphragm 2 to ensure that it can pass through the through holes 5 on the flexible circuit diaphragm 2 and connect with the pressure plate 4.

[0038] The advantage of integrally molding the workpiece body 1 and the connecting part 3 is that the structure is more stable, the number of parts is reduced, and the assembly process is simplified. Since there is no connection interface between the integrally molded connecting part 3 and the workpiece body 1, there is no risk of loosening or breakage.

[0039] In the second variant, the connecting portion 3 and the pressure plate 4 are integrally formed. During the manufacturing process, multiple connecting portions 3 are directly formed on the lower surface of the pressure plate 4. These connecting portions 3 are also columnar, perpendicular to the surface of the pressure plate 4. The length of the connecting portion 3 needs to be sufficient to pass through the flexible circuit diaphragm 2 and connect with the workpiece body 1.

[0040] The advantage of integrally molding the pressure plate 4 and the connecting part 3 is that it improves the stability of the pressure plate 4 and reduces stress concentration between the pressure plate 4 and the connecting part 3. The integral molding structure also simplifies the manufacturing process of the pressure plate 4 and reduces the number of parts.

[0041] Example 4:

[0042] like Figures 1-7As shown, this utility model mainly includes a workpiece body 1, a flexible circuit diaphragm 2, and a pressure plate 4. The workpiece body 1 is fixedly connected to the flexible circuit diaphragm 2 by an adhesive to form a stable structure.

[0043] The surface of workpiece 1 is cleaned to remove oil and dust. Then, a layer of adhesive is evenly applied to the surface of workpiece 1. The flexible circuit diaphragm 2 is also surface-treated to ensure good contact with the adhesive. The adhesive-coated workpiece 1 and flexible circuit diaphragm 2 are aligned and pressed together, secured with clamps, and allowed to stand to allow the adhesive to fully cure. The cured adhesive layer forms a strong bond between workpiece 1 and flexible circuit diaphragm 2.

[0044] In another embodiment, the pressure plate 4 is fixedly connected to the flexible circuit diaphragm 2 by an adhesive. The adhesive is evenly applied to the surface of the pressure plate 4, and then the flexible circuit diaphragm 2 is placed on the pressure plate 4, aligned, and then pressed to fix it.

[0045] In another embodiment, the connecting portion 3 and the workpiece body 1 are integrally formed. During the manufacturing process, multiple connecting portions 3 are directly formed on the lower surface of the workpiece body 1. These connecting portions 3 are also columnar and perpendicular to the surface of the workpiece body 1. The length of the connecting portion 3 needs to be sufficient to pass through the flexible circuit diaphragm 2 and connect to the pressure plate 4. The pressure plate 4 is fixedly connected to the flexible circuit diaphragm 2, the connecting portion 3, and the workpiece body 1 by in-mold decoration (IMD) adhesive. The in-mold decoration (IMD) adhesive is evenly applied to the surface of the flexible circuit diaphragm 2, and then the flexible circuit diaphragm 2 is placed in the injection mold, aligned with the cavity of the pressure plate 4, and fixed. After injection molding, it is integrally formed with the pressure plate 4, the workpiece body 1, and the connecting portion 3.

[0046] In the second variant, the connecting part 3 and the pressure plate 4 are integrally molded. During the manufacturing process, multiple connecting parts 3 are directly formed on the lower surface of the pressure plate 4. These connecting parts 3 are also columnar and perpendicular to the surface of the pressure plate 4. The length of the connecting parts 3 needs to be sufficient to pass through the flexible circuit diaphragm 2 and connect to the workpiece body 1. The workpiece body 1 is fixedly connected to the flexible circuit diaphragm 2, the connecting parts 3, and the pressure plate 4 using in-mold decoration (IMD) adhesive. The in-mold decoration (IMD) adhesive is evenly applied to the surface of the flexible circuit diaphragm 2, and then the flexible circuit diaphragm 2 is placed in the injection mold, aligned with the cavity of the workpiece body 1, and fixed. After injection molding, it is integrally molded with the pressure plate 4, the workpiece body 1, and the connecting parts 3.

[0047] In in-mold decoration (IMD) processes, adhesives are key materials for bonding the film to the injection molding resin. IMD adhesives need to possess high adhesion, high temperature resistance, chemical resistance, and good printability. The following are the main materials and properties of IMD adhesives:

[0048] 1. Main components of IMD adhesive

[0049] IMD adhesives typically consist of the following components:

[0050] Resin substrate:

[0051] Polyester polyols: provide the main adhesive properties of the adhesive, with a molecular weight typically between 20,000 and 30,000, and have good flexibility and adhesion.

[0052] Styrene-acrylic resin: Low-crosslinked styrene-acrylic resin is used to enhance the heat resistance and chemical resistance of adhesives.

[0053] Polyurethane curing agents: used to improve the strength and durability of adhesives.

[0054] Coupling agents: silane coupling agents or titanate coupling agents: used to enhance the adhesion between adhesives and different materials (such as PET, PC films).

[0055] Solvents: Commonly used solvents include mixed diesters (DBE), isophorone, toluene, xylene, and cyclohexanone, which are used to adjust the viscosity and flowability of adhesives.

[0056] Fillers: fumed silica, bentonite, calcium carbonate, etc., used to improve the rheological properties and mechanical strength of adhesives.

[0057] Surface additives: acrylic defoamers and leveling agents: used to improve the printability and appearance of adhesives.

[0058] 2. Properties of IMD adhesives

[0059] IMD adhesives need to meet the following performance requirements:

[0060] High adhesion: It can firmly bond PET, PC and other films to injection molding resins (such as ABS, PC).

[0061] High temperature resistance: It remains stable during the injection molding process (usually at a temperature of 200-300℃) and does not decompose or fail.

[0062] Chemical resistance: It can resist the erosion of chemicals in injection molding resin.

[0063] Environmental friendliness: Halogen-free (chlorine and bromine content is less than 900 ppm), in compliance with environmental regulations.

[0064] Printability: Suitable for screen printing, capable of uniform coating on film surfaces.

[0065] This connection method integrates the pressure plate 4 and the flexible circuit diaphragm 2 into a single unit, enhancing structural stability. The pressure plate 4 protects and supports the flexible circuit diaphragm 2, preventing deformation. The adhesive layer also fills the tiny gaps between the pressure plate 4 and the diaphragm, reducing stress concentration points.

[0066] In practical applications, depending on specific needs, the workpiece 1 can be bonded to the flexible circuit diaphragm 2, or the pressure plate 4 can be bonded to the flexible circuit diaphragm 2, or both can be used simultaneously. The former is suitable for situations where the flexible circuit diaphragm 2 needs to be tightly attached to the surface of the workpiece 1, while the latter is more suitable for scenarios where the pressure plate 4 needs to protect the flexible circuit diaphragm 2.

[0067] Example 5:

[0068] like Figures 1-7 As shown, this utility model mainly includes a workpiece body 1, a flexible circuit diaphragm 2, a pressure plate 4, and a connecting part 3. The flexible circuit diaphragm 2 is fixedly installed on the workpiece body 1, and the flexible circuit diaphragm 2 has a through hole 5. The workpiece body 1 is fixedly connected to the pressure plate 4 through the connecting part 3, and the connecting part 3 passes through the through hole 5 on the flexible circuit diaphragm 2. The pressure plate 4 presses down on the joint between the workpiece body 1 and the flexible circuit diaphragm 2.

[0069] In this embodiment, the fixed connection between the pressure plate 4 and the connecting part 3 adopts multiple methods:

[0070] The first method is a two-stage injection molding process for fixed connection. In this process, the workpiece 1 and the flexible circuit diaphragm 2 are first assembled. Then, the connecting part 3 is inserted into the through-hole 5 of the flexible circuit diaphragm 2. Next, the assembled semi-finished product is placed into an injection mold, and hot-melt plastic is injected. Under high temperature and pressure, the hot-melt plastic tightly wraps the pressure plate 4 and the connecting part 3, forming an integrated structure. After cooling and solidification, the pressure plate 4 and the connecting part 3 form a strong, heat-fused fixed connection. This connection method fuses the pressure plate 4 and the connecting part 3 at the molecular level, resulting in high connection strength and good stability.

[0071] The second type is bolt-fixed connection. In this connection method, threaded holes are pre-machined on the connecting part 3, and corresponding through holes 5 are opened on the pressure plate 4. During installation, the pressure plate 4 is placed in the appropriate position, and bolts are passed through the through holes 5 on the pressure plate 4 and screwed into the threaded holes of the connecting part 3. By tightening the bolts, the pressure plate 4 is firmly fixed to the connecting part 3. This connection method facilitates disassembly.

[0072] The third type is a snap-fit ​​connection. The connecting part 3 is designed with elastic claws, and the pressure plate 4 has corresponding slots. During installation, simply align the pressure plate 4 and press firmly; the claws will deform and insert into the slots. Once the claws are fully in the slots, the elastic restoring force causes the claws to lock onto the edge of the slots, thus securing the pressure plate 4. For disassembly, simply pry open the claws with a tool to easily remove the pressure plate 4. This connection method is simple and quick to operate.

[0073] The fourth type is fusion welding. This method requires that the materials of the pressure plate 4 and the connecting part 3 are compatible and can be fused. During installation, the pressure plate 4 is placed in the correct position, and then the joint is locally heated using welding equipment such as laser or ultrasonic welding. Under high temperature, the contact surfaces of the pressure plate 4 and the connecting part 3 melt and fuse together. After cooling, a strong thermal fusion is formed. This connection method has high connection strength and good sealing performance.

[0074] Example 5:

[0075] like Figures 1-7 As shown, the pressure plate 4 of the present invention is provided with a functional component 6, which is a hook structure 7, a reinforcing rib structure 8, or a screw hole post structure 9, used to connect and fix other components, thereby improving the practicality of the present invention.

[0076] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0077] The above description is only used to illustrate the technical solution of this utility model and is not intended to limit it. Any other modifications or equivalent substitutions made by those skilled in the art to the technical solution of this utility model, as long as they do not depart from the spirit and scope of the technical solution of this utility model, should be covered within the scope of the claims of this utility model.

Claims

1. A robust three-in-one laminated structure integrally injection molded with a diaphragm and upper and lower layers, comprising a workpiece body and a flexible circuit diaphragm, wherein the flexible circuit diaphragm is fixedly mounted on the workpiece body, characterized in that, The workpiece is fixedly connected to a pressure plate via a connecting part, and the flexible circuit diaphragm has a through hole through which the connecting part passes.

2. The robust three-in-one laminated structure integrally injection molded with the diaphragm and upper and lower layers according to claim 1, characterized in that, The connecting part and the workpiece body are integrally injection molded structures.

3. The robust three-in-one laminated structure integrally injection molded with the diaphragm and upper and lower layers according to claim 1, characterized in that, The connecting part and the pressure plate are integrally injection molded structures.

4. The robust three-in-one laminated structure integrally injection molded with the diaphragm and upper and lower layers according to claim 1, characterized in that, The workpiece body is fixedly connected to the flexible circuit diaphragm by an adhesive.

5. The robust three-in-one laminated structure integrally injection molded with the diaphragm and upper and lower layers according to claim 1, characterized in that, The pressure plate is fixedly connected to the flexible circuit diaphragm by an adhesive.

6. The robust three-in-one laminated structure integrally injection molded with the diaphragm and upper and lower layers according to claim 1, characterized in that, The pressure plate is fixedly connected to the connecting part through a secondary injection molding process.

7. The robust three-in-one laminated structure integrally injection molded with the diaphragm and upper and lower layers according to claim 1, characterized in that, The pressure plate is fixedly connected to the connecting part by bolts.

8. The robust three-in-one laminated structure integrally injection molded with the diaphragm and upper and lower layers according to claim 1, characterized in that, The pressure plate is fixedly connected to the connecting part by a snap-fit ​​mechanism.

9. The robust three-in-one laminated structure integrally injection molded with the diaphragm and upper and lower layers according to claim 1, characterized in that, The pressure plate is fixedly connected to the connecting part by welding.

10. A robust three-in-one laminated structure integrally injection molded with the diaphragm and upper and lower layers according to claim 1, characterized in that, The pressure plate is provided with functional components, which are hook structures, reinforcing rib structures, or screw hole pillar structures.

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