Capacitive touch key film with binding combination of PET circuit and FPC

Abstract

The utility model relates to the technical field of electronics, in particular to a PET (polyethylene terephthalate) circuit and FPC (flexible printed circuit) binding combined capacitive touch key film, which comprises a film diaphragm, one end of the film diaphragm is connected with a circuit board, one end of the circuit board is adhered with conductive adhesive, a first protective layer is arranged below the film diaphragm, and a second protective layer is arranged below the film diaphragm. A first protective layer is arranged on the upper portion of the first protective layer, a second protective layer is arranged on the upper portion of the thin film, a PET release film is connected to the upper portion of the second protective layer in an attached mode, and the first protective layer and the second protective layer are both transparent layers. The whole film structure is more transparent visually, the stability of the whole structure is further enhanced through the binding design of the PET circuit and the FPC, the tensile strength and the crease resistance of the film are improved, the film is not prone to deformation or damage under the action of external force, and therefore the reliability of connection and insertion is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of electronics, in particular to a PET circuit and an FPC binding combined with a capacitive touch key film. Background Art

[0002] Capacitive touch buttons often use PET as the substrate, on which ink is printed through a screen printing process, and then assembled with post-process materials such as adhesive tape, and finally stamped into shape. The button area and the outlet connection area are integrally formed, and the outlet connection uses wear-resistant and scratch-resistant carbon paste material to contact the socket. Although this process has cost advantages, its wear resistance is limited and only meets the connection standards of some customers. The FPC line plug-in gold finger adopts immersion gold or gold plating technology, which has high wear resistance and reliability and widely meets customer needs. However, if the FPC gold finger technology is applied to the one-piece flexible touch button, the button area will not be light-transmissive, which limits the scope of product application and the cost is relatively high. Therefore, in the design and production process, factors such as cost, wear resistance and product application type need to be weighed.

[0003] After searching, the Chinese patent document application number: 201721144637.3 discloses a capacitive flexible touch button, including a panel, which is provided with a light-shielding layer, a character layer, a polymer ink layer, a wire layer and an insulating protective layer from top to bottom, eliminating the role of the back glue. The wire layer is attached to the panel by printing, so that the wire layer and the panel are integrated and will not shift or fall off. At the same time, the structure is simple, the installation is convenient and fast, firm and reliable, it will not be oxidized after long-term use, and it has good waterproof effect, beautiful appearance and strong attraction.

[0004] However, the above-mentioned capacitive flexible touch button still has the following defects:

[0005] The above-mentioned capacitive flexible touch button is attached to the panel by printing, so that the wire layer and the panel are integrated and will not shift or fall off. At the same time, it has a simple structure, is convenient and quick to install, is firm and reliable, will not be oxidized after long-term use, has good waterproof effect, beautiful appearance and strong appeal. However, the button area of ​​the device will not be light-transmissive and only meets the connection standards of some customers. Therefore, we need to provide a PET circuit and FPC binding combined with a capacitive touch button film to solve the above problems. Utility Model Content

[0006] The purpose of the utility model is to provide a PET circuit and FPC binding combined with a capacitive touch button film, mainly by adopting a transparent layer design for both the first protective layer and the second protective layer, so that the entire film structure is more visually transparent, and the binding design of the PET circuit and the FPC further enhances the stability of the overall structure, which not only improves the tensile strength and crease resistance of the film, but also makes the film less likely to be deformed or damaged when subjected to external forces, thereby ensuring the reliability of the connection, and by using ACF conductive glue for connection, additional connectors and components are reduced, simplifying the production process and assembly process, which not only reduces the production cost but also improves the production efficiency.

[0007] To achieve the above-mentioned purpose, the utility model provides the following technical solution: a PET circuit and an FPC are bound together with a capacitive touch button film, including a thin film membrane, one end of the thin film membrane is connected to a circuit board, one end of the circuit board is bonded with a conductive glue, the conductive glue is bonded to one end of the thin film membrane, the conductive glue is ACF conductive glue, a first protective layer is arranged below the thin film membrane, a second protective layer is arranged above the thin film membrane, a PET release film is bonded above the second protective layer, and the first protective layer and the second protective layer are both arranged as transparent layers.

[0008] Preferably, the circuit board is configured as a flexible circuit board, and a PI reinforcement is installed at the bottom of the other end of the flexible circuit board.

[0009] Preferably, a protective layer tear handle is bonded to an outer wall of one side of the first protective layer, and the first protective layer is configured as a PET protective layer.

[0010] Preferably, the second protective layer is configured as an OCA protective layer.

[0011] Preferably, wire outlet foam is heat-pressed and welded around the surface of the circuit board.

[0012] Preferably, a release film tear handle is bonded to one outer wall of the PET release film.

[0013] Preferably, a film frame is fixedly installed around the outer wall of the film diaphragm, and a key conductive ink is arranged inside the film diaphragm, and the key conductive ink is electrically connected to the circuit board.

[0014] Compared with the prior art, the beneficial effects of the utility model are:

[0015] The utility model mainly adopts a transparent layer design for both the first protective layer and the second protective layer, so that the entire film structure is more visually transparent, and the binding design of the PET line and the FPC further enhances the stability of the overall structure, which not only improves the tensile strength and crease resistance of the film, but also makes the film less likely to deform or be damaged when subjected to external forces, thereby ensuring the reliability of the connection, and by using ACF conductive adhesive for connection, additional connectors and components are reduced, simplifying the production process and assembly process, which not only reduces the production cost but also improves the production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a three-dimensional structural schematic diagram of the utility model;

[0017] Figure 2 It is an enlarged structural schematic diagram of the second protective layer and the PET release film of the utility model;

[0018] Figure 3 It is an enlarged structural schematic diagram of the first protective layer and the thin film diaphragm of the utility model.

[0019] In the figure: 1. First protective layer; 2. Protective layer tearing handle; 3. Film frame; 4. Film diaphragm; 5. Key conductive ink; 6. Conductive glue; 7. Circuit board; 71. Wire foam; 8. PI reinforcement; 9. Second protective layer; 10. PET release film; 11. Release film tearing handle. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] See also Figure 1-3 The utility model provides a technical solution: a PET circuit and an FPC are bound together with a capacitive touch key film, including a film diaphragm 4, one end of the film diaphragm 4 is connected to a circuit board 7, one end of the circuit board 7 is bonded with a conductive glue 6, the conductive glue 6 is bonded to one end of the film diaphragm 4, the conductive glue 6 is an ACF conductive glue, a first protective layer 1 is arranged below the film diaphragm 4, a second protective layer 9 is arranged above the film diaphragm 4, a PET release film 10 is bonded above the second protective layer 9, and the first protective layer 1 and the second protective layer 9 are both arranged as transparent layers;

[0022] When in use, the transparent layer design is adopted for both the first protective layer 1 and the second protective layer 9, so that the entire film structure is more visually transparent, and the binding design of the PET line and the FPC further enhances the stability of the overall structure, which not only improves the tensile strength and crease resistance of the film, but also makes the film less likely to deform or be damaged when subjected to external forces, thereby ensuring the reliability of the connection, and by using ACF conductive adhesive for connection, additional connectors and components are reduced, simplifying the production process and assembly process, which not only reduces the production cost but also improves the production efficiency.

[0023] The circuit board 7 is configured as a flexible circuit board, and a PI reinforcement 8 is installed at the bottom of the other end of the flexible circuit board. Since the flexible circuit board has excellent process flexibility, it can be customized according to the actual needs of the product, reducing unnecessary connectors and connectors, thereby simplifying the production process. The introduction of the PI reinforcement 8 material further enhances the mechanical strength and crease resistance of the flexible circuit board.

[0024] A protective layer tearing handle 2 is bonded to one side outer wall of the first protective layer 1. The first protective layer 1 is configured as a PET protective layer. By configuring the protective layer tearing handle 2 on one side outer wall of the first protective layer 1, the user can easily grasp and tear off the protective layer. The PET material exhibits good stability to most chemical substances and is not susceptible to chemical corrosion or erosion. The PET material is environmentally friendly and has a relatively low production cost. Therefore, using PET as the first protective layer 1 not only helps to reduce environmental pollution, but also reduces production costs.

[0025] The second protective layer 9 is configured as an OCA protective layer. The OCA protective layer has strong adhesive properties and can fit tightly on the capacitive touch button film to ensure a stable connection between the layers. The OCA material has excellent weather resistance and can resist erosion by environmental factors such as ultraviolet rays and high temperature, so that the capacitive touch button film can maintain stable performance outdoors or in high temperature environments, thereby extending the service life of the product.

[0026] The surface of the circuit board 7 is hot-pressed and welded with wire-out foam 71. The wire-out foam 71 is tightly attached to the surface of the circuit board 7 to form an effective barrier, which can prevent external moisture and dust from entering the inside of the circuit board 7. The hot-pressing welding process can be completed quickly and accurately, thereby improving production efficiency and reducing production costs.

[0027] A release film tearing handle 11 is adhered to the outer wall of one side of the PET release film 10. The existence of the release film tearing handle 11 enables the user to operate more conveniently and quickly when the PET release film 10 needs to be replaced or removed. By easily grasping the tearing handle, the user can easily tear the release film from the product surface without using additional tools or applying excessive force. This greatly improves the convenience and efficiency of operation, especially in large-scale production or maintenance processes, and can significantly reduce operation time and labor costs.

[0028] A film frame 3 is fixedly installed around the outer wall of the film diaphragm 4, and a key conductive ink 5 is arranged inside the film diaphragm 4. The key conductive ink 5 is electrically connected to the circuit board 7. The fixed installation of the film frame 3 provides additional support and protection for the film diaphragm 4. Under the impact or vibration of the external environment, the film frame 3 can effectively prevent the film diaphragm 4 from deformation, distortion or damage, thereby ensuring the long-term stability and durability of the film diaphragm 4. The setting of the key conductive ink 5 enables the film diaphragm 4 to have excellent conductive properties. When the user touches the key, the conductive ink can quickly transmit the signal to the circuit board 7, thereby achieving rapid response and precise control.

[0029] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A PET circuit and an FPC binding combined with a capacitive touch key film, comprising a film sheet (4), characterized in that: One end of the thin film diaphragm (4) is connected to a circuit board (7), one end of the circuit board (7) is bonded with a conductive adhesive (6), the conductive adhesive (6) is bonded to one end of the thin film diaphragm (4), the conductive adhesive (6) is ACF conductive adhesive, a first protective layer (1) is arranged below the thin film diaphragm (4), a second protective layer (9) is arranged above the thin film diaphragm (4), a PET release film (10) is bonded above the second protective layer (9), and the first protective layer (1) and the second protective layer (9) are both arranged as transparent layers.

2. The PET circuit and FPC binding combined with capacitive touch key film according to claim 1, characterized in that: The circuit board (7) is configured as a flexible circuit board, and a PI reinforcement (8) is installed at the bottom of the other end of the flexible circuit board.

3. The PET circuit and FPC binding combined with capacitive touch key film according to claim 2, characterized in that: A protective layer tear handle (2) is bonded to one outer wall of the first protective layer (1), and the first protective layer (1) is configured as a PET protective layer.

4. The PET circuit and FPC binding combined with capacitive touch key film according to claim 3, characterized in that: The second protective layer (9) is configured as an OCA protective layer.

5. The PET circuit and FPC binding combined with capacitive touch key film according to claim 4, characterized in that: Wire outlet foam (71) is heat-pressed and welded around the surface of the circuit board (7).

6. The PET circuit and FPC binding combined with capacitive touch key film according to claim 5, characterized in that: A release film tearing handle (11) is bonded to one outer wall of the PET release film (10).

7. The PET circuit and FPC binding combined with capacitive touch key film according to claim 6, characterized in that: A film frame (3) is fixedly mounted around the outer wall of the film diaphragm (4), and a key conductive ink (5) is provided inside the film diaphragm (4), and the key conductive ink (5) is electrically connected to the circuit board (7).

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