High-conductivity flexible keyboard conductive film

Abstract

The utility model belongs to the technical field of conducting films, and discloses a high-conductivity flexible keyboard conducting film which comprises a lower PET film layer, an FPC circuit board is electrically connected to the lower PET film layer, a first insulating ink layer is arranged on the upper surface of the lower PET film layer, a first waterproof glue layer is arranged on the upper surface of the first insulating ink layer, and a second waterproof glue layer is arranged on the lower surface of the first waterproof glue layer. The upper surface of the first waterproof glue layer is provided with a middle PET film layer, the upper surface of the middle PET film layer is provided with a second waterproof glue layer, the upper surface of the second waterproof glue layer is provided with a second insulating ink layer, the upper surface of the second insulating ink layer is provided with an upper PET film layer, and the upper PET film layer is provided with an edge sealing assembly used for edge sealing. The waterproof conductive film has the effect of improving the waterproof capability of the conductive film.

Description

Technical Field

[0001] This utility model relates to the field of conductive film technology, and in particular to a highly conductive flexible keyboard conductive film. Background Technology

[0002] Conductive films are widely used in LCD displays, OLED displays, touch panels, electromagnetic wave protection, solar cells, heat-generating devices, and light-emitting devices. Keyboard conductive films, also known as metal spring conductive films, are thin PET sheets containing metal springs, used on PCBs or FPCs as switches. They function as an important tactile switch between the user and the instrument. Conductivity is achieved by printing conductive silver paste onto the PET sheet. However, if water or other liquids are accidentally spilled on a traditional keyboard, they can seep into the keyboard and remain inside, potentially causing a short circuit in the conductive film's internal circuitry. Because the conductive film's waterproofing is not ideal, this can lead to malfunctions in its conductive function.

[0003] Chinese utility model patent CN220189259U discloses a water-resistant conductive film for keyboards, comprising a protective layer, an adhesive layer, a substrate layer, and a first waterproof layer arranged sequentially. The adhesive layer has several conductive grooves, and conductive material is placed within these grooves to form a conductive layer. This utility model's waterproof conductive film for keyboards has a simple structure and is easy to use. By setting a protective layer and a waterproof layer on the conductive film, the waterproof performance of the conductive film can be improved. Simultaneously, setting conductive grooves on the adhesive layer and filling them with conductive material to form a conductive layer can improve the adhesion between the conductive layer and the substrate layer, and also reduce the overall thickness of the conductive film.

[0004] Regarding the aforementioned technologies, the inventors believe that the following defects exist: The above-mentioned device provides waterproof protection for the conductive layer by setting a first waterproof layer and a second waterproof layer on both sides of the conductive layer. In actual use, since there are structures such as an adhesive layer and a substrate layer between the first waterproof layer and the second waterproof layer, water can easily penetrate into the conductive layer through the edges of the first waterproof layer and the second waterproof layer, resulting in limited protection and a poor user experience. Utility Model Content

[0005] To address the aforementioned problems, this invention provides a highly conductive flexible keyboard conductive film.

[0006] The above-mentioned technical objective of this utility model is achieved through the following technical solution: a highly conductive flexible keyboard conductive film, comprising a lower PET film layer, an FPC circuit board electrically connected to the lower PET film layer, a first insulating ink layer disposed on the upper surface of the lower PET film layer, a first waterproof adhesive layer disposed on the upper surface of the first insulating ink layer, an intermediate PET film layer disposed on the upper surface of the first waterproof adhesive layer, a second waterproof adhesive layer disposed on the upper surface of the intermediate PET film layer, a second insulating ink layer disposed on the upper surface of the second waterproof adhesive layer, an upper PET film layer disposed on the upper surface of the second insulating ink layer, and an edge sealing assembly disposed on the upper PET film layer.

[0007] By adopting the above technical solution, due to the excellent water-repellent properties of PET, the upper, middle, and lower PET film layers all exhibit good water-repellent effects. When workers seal the edges of the upper, middle, and lower PET film layers using the edge-sealing assembly, the assembly blocks water flow, thereby reducing the probability of water flowing through the edges of the upper, middle, and lower PET film layers into the conductive film. This results in the conductive film having excellent overall waterproof performance, further reducing the probability of water entering the conductive film.

[0008] Furthermore, the edge sealing assembly includes a first edge sealing layer disposed at the edge of the upper surface of the upper PET film layer, a second edge sealing layer disposed at the edge of the bottom surface of the lower PET film layer, and a waterproof adhesive layer jointly installed on the sidewalls of the first edge sealing layer and the second edge sealing layer that are close to each other.

[0009] By adopting the above technical solution, when workers need to seal the edges of the upper, middle, and lower PET film layers, they must ensure that the second sealing layer is pressed firmly against the bottom surface of the lower PET film layer, and that the bottom surface of the first sealing layer is pressed firmly against the top surface of the upper PET film layer. This allows the first and second sealing layers to work together to wrap the conductive film. Subsequently, waterproof adhesive is applied between the first and second sealing layers. Once the waterproof adhesive dries, it forms a waterproof adhesive layer, which, along with the first and second sealing layers and the waterproof adhesive layer, works together to protect the edges of the conductive film, thereby reducing the probability of water entering the conductive film.

[0010] Furthermore, a positioning ring is fixed on the bottom surface of the first edge sealing layer, and a receiving groove matching the positioning ring is formed on the upper surface of the second edge sealing layer.

[0011] By adopting the above technical solution, when the staff needs to install the first edge sealing layer, the staff only needs to press the second edge sealing layer against the bottom surface of the lower PET film layer and connect the multiple positioning rings with the corresponding receiving grooves to make the first edge sealing layer press against the upper surface of the upper PET film layer, thereby making the first edge sealing layer and the second edge sealing layer stable, thus reducing the difficulty for the staff to install the edge sealing components.

[0012] Furthermore, multiple first limiting pieces distributed at equal intervals are installed on the two opposing inner walls of the first sealing layer.

[0013] Furthermore, multiple second limiting pieces distributed at equal intervals are installed on the two opposing inner walls of the second sealing layer.

[0014] By adopting the above technical solution, the first limiting piece reduces the probability of external force directly contacting the upper PET film layer, and the second limiting piece reduces the probability of external force directly contacting the lower PET film layer, thereby reducing the probability of damage to the conductive film and improving the user experience for staff.

[0015] Furthermore, the thickness of both the upper PET film layer and the lower PET film layer is 0.08-0.12 mm.

[0016] Furthermore, the first edge sealing layer is made of EPDM rubber.

[0017] Furthermore, the second edge sealing layer is made of EPDM rubber.

[0018] By adopting the above technical solution, ethylene propylene diene monomer (EPDM) rubber, a copolymer of ethylene, propylene, and a small amount of non-conjugated diene, is a type of ethylene propylene rubber. Because its main chain is composed of chemically stable saturated hydrocarbons, and it only contains unsaturated double bonds in its side chains, it exhibits excellent aging resistance, including ozone resistance, heat resistance, and weather resistance. It can be widely used in automotive parts, waterproof building materials, wire and cable sheathing, heat-resistant hoses, tapes, and automotive seals. The first and second sealing layers made of EPDM rubber are very flexible and have good waterproof properties, further reducing the probability of water entering the conductive film and thus reducing the probability of damage to the conductive circuit.

[0019] In summary, this utility model has the following beneficial effects:

[0020] 1. In this application, due to the excellent water-repellent properties of PET, the upper, middle, and lower PET film layers made of PET all exhibit good water-repellent effects. When workers seal the edges of the upper, middle, and lower PET film layers using the edge-sealing assembly, the assembly blocks water flow, thereby reducing the probability of water flowing through the edges of the upper, middle, and lower PET film layers into the conductive film. This results in the conductive film having excellent overall waterproof performance, further reducing the probability of water entering the conductive film.

[0021] 2. In this application, when workers need to seal the edges of the upper, middle, and lower PET film layers, they must ensure that the second sealing layer is pressed against the bottom surface of the lower PET film layer and the bottom surface of the first sealing layer is pressed against the upper surface of the upper PET film layer. This allows the first and second sealing layers to work together to wrap the conductive film. Subsequently, workers apply waterproof adhesive between the first and second sealing layers. Once the waterproof adhesive dries, it forms a waterproof adhesive layer, thus the first, second, and waterproof sealing layers work together to protect the edges of the conductive film, reducing the probability of water entering the conductive film.

[0022] 3. In this application, when the staff needs to install the first edge sealing layer, the staff only needs to press the second edge sealing layer against the bottom surface of the lower PET film layer and connect the multiple positioning rings with the corresponding receiving grooves to make the first edge sealing layer press against the upper surface of the upper PET film layer, thereby making the first edge sealing layer and the second edge sealing layer stable, thus reducing the difficulty for the staff to install the edge sealing components. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present utility model;

[0024] Figure 2 This is a schematic diagram of the second sealing layer and its connection structure according to an embodiment of the present invention;

[0025] Figure 3 This is a schematic diagram of the first limiting piece and its connection structure according to an embodiment of the present utility model;

[0026] Figure 4 This is a schematic diagram of the first waterproof adhesive layer and its connection structure in an embodiment of this utility model.

[0027] In the diagram: 1. Lower PET film layer; 11. FPC circuit board; 2. First insulating ink layer; 21. First waterproof adhesive layer; 3. Middle PET film layer; 31. Second waterproof adhesive layer; 4. Second insulating ink layer; 41. Upper PET film layer; 5. Edge sealing assembly; 51. First edge sealing layer; 52. Second edge sealing layer; 53. Waterproof adhesive layer; 6. Positioning ring; 61. Receiving groove; 7. First limiting piece; 8. Second limiting piece. Detailed Implementation

[0028] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0029] like Figure 1-4 As shown in the illustration, this application discloses a highly conductive flexible keyboard conductive film, comprising a lower PET film layer 1, an FPC circuit board 11, a first insulating ink layer 2, a first waterproof adhesive layer 21, an intermediate PET film layer 3, a second waterproof adhesive layer 31, a second insulating ink layer 4, an upper PET film layer 41, an edge sealing assembly 5, a positioning ring 6, a first limiting piece 7, and a second limiting piece 8. The upper surface of the lower PET film layer 1 is printed with lower conductive lines. The FPC circuit board 11 is electrically connected to the lower PET film layer 1. The first insulating ink layer 2 is printed on the upper surface of the lower PET film layer 1, and the first waterproof adhesive layer 21 is printed on the upper surface of the first insulating ink layer 2. The intermediate PET film layer 3 is disposed on the upper surface of the first waterproof adhesive layer 21, the second waterproof adhesive layer 31 is disposed on the upper surface of the intermediate PET film layer 3, and the second insulating ink layer 4 is disposed on the upper surface of the second waterproof adhesive layer 31.

[0030] The upper PET film layer 41 is disposed on the upper surface of the second insulating ink layer 4. The thickness of the upper PET film layer 41 and the lower PET film layer 1 is 0.08-0.12mm, and the bottom surface of the upper PET film layer 41 is printed with upper conductive lines.

[0031] When the keyboard is assembled and no keys are pressed, the middle PET film layer 3 physically separates the upper and lower conductive circuits, and the circuit is in an open state. When the user presses a key, the corresponding position of the upper PET film layer 41 deforms downward, causing the upper conductive circuit to move downward under the action of external force and come into contact with the lower conductive circuit, thus forming a conductive path between the upper and lower conductive circuits. At this time, current flows through the closed circuit, triggering the keyboard's signal processing module to identify the key position and send the corresponding command (such as inputting characters).

[0032] An edge sealing assembly 5 is disposed on the upper PET film layer 41 for edge sealing. The edge sealing assembly 5 includes a first edge sealing layer 51, a second edge sealing layer 52, and a waterproof adhesive layer 53. The first edge sealing layer 51 is disposed at the upper surface edge of the upper PET film layer 41, the second edge sealing layer 52 is disposed at the bottom surface edge of the lower PET film layer 1, and the waterproof adhesive layer 53 is jointly installed on the sidewalls of the first edge sealing layer 51 and the second edge sealing layer 52 that are close to each other.

[0033] When workers need to seal the edges of the upper PET film layer 41, the middle PET film layer, and the lower PET film layer 1, they must ensure that the second sealing layer 52 is pressed firmly against the bottom surface of the lower PET film layer 1, and that the bottom surface of the first sealing layer 51 is pressed firmly against the upper surface of the upper PET film layer 41. This allows the first sealing layer 51 and the second sealing layer 52 to work together to wrap the conductive film. Subsequently, workers must apply waterproof adhesive between the first sealing layer 51 and the second sealing layer 52. Once the waterproof adhesive dries, it forms a waterproof adhesive layer 53. This allows the first sealing layer 51, the second sealing layer 52, and the waterproof adhesive layer 53 to work together to protect the edges of the conductive film, thereby reducing the probability of water entering the conductive film.

[0034] The positioning ring 6 is a circular sheet structure. Multiple positioning rings 6 are provided and are fixed in sequence to the bottom surface of the first sealing layer 51. Multiple receiving grooves 61 are provided on the upper surface of the second sealing layer 52, which correspond one-to-one with the positioning rings 6 and match each other.

[0035] When the staff needs to install the first edge sealing layer 51, the staff only needs to press the second edge sealing layer 52 against the bottom surface of the lower PET film layer 1 and connect the multiple positioning rings 6 with the corresponding receiving grooves 61 to make the first edge sealing layer 51 press against the upper surface of the upper PET film layer 41, thereby making the first edge sealing layer 51 and the second edge sealing layer 52 stable, thus reducing the difficulty for the staff to install the edge sealing assembly 5.

[0036] The first limiting piece 7 is a sheet-like structure, and multiple first limiting pieces 7 are distributed at equal intervals on the two opposing inner walls of the first edge sealing layer 51. The second limiting piece 8 is a sheet-like structure, and multiple second limiting pieces 8 are distributed at equal intervals on the two opposing inner walls of the second edge sealing layer 52.

[0037] The first limiting piece 7 reduces the probability of external force directly contacting the upper PET film layer 41, and the second limiting piece 8 reduces the probability of external force directly contacting the lower PET film layer 1, thereby reducing the probability of damage to the conductive film and improving the user experience for staff.

[0038] To reduce the probability of damage to the conductive circuitry, both the first sealing layer 51 and the second sealing layer 52 are made of ethylene propylene diene monomer (EPDM) rubber. EPDM rubber is a copolymer of ethylene, propylene, and a small amount of non-conjugated diene. It is a type of ethylene propylene rubber. Because its main chain is composed of chemically stable saturated hydrocarbons, and it only contains unsaturated double bonds in its side chains, it exhibits excellent aging resistance, including ozone resistance, heat resistance, and weather resistance. It can be widely used in automotive parts, waterproof building materials, wire and cable sheaths, heat-resistant hoses, tapes, and automotive seals. The first sealing layer 51 and the second sealing layer 52, made of EPDM rubber, are very flexible and have good water resistance, further reducing the probability of water entering the conductive film and thus reducing the probability of damage to the conductive circuitry.

[0039] The working principle of the highly conductive flexible keyboard conductive film in this embodiment is as follows: Due to the excellent water-repellent effect of PET, the upper PET film layer 41, the middle PET film layer, and the lower PET film layer 1, all made of PET, have excellent water-repellent properties. When the workers seal the edges of the upper PET film layer 41, the middle PET film layer, and the lower PET film layer 1 using the edge-sealing assembly 5, the edge-sealing assembly 5 blocks the water flow, thereby reducing the probability of water flowing through the edges of the upper PET film layer 41, the middle PET film layer, and the lower PET film layer 1 into the conductive film. This results in the conductive film having a good overall waterproof effect, further reducing the probability of water entering the conductive film.

[0040] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.

Claims

1. A highly conductive flexible keyboard conductive film, comprising a lower PET film layer (1), characterized in that: The lower PET film layer (1) is electrically connected to an FPC circuit board (11). The upper surface of the lower PET film layer (1) is provided with a first insulating ink layer (2). The upper surface of the first insulating ink layer (2) is provided with a first waterproof adhesive layer (21). The upper surface of the first waterproof adhesive layer (21) is provided with an intermediate PET film layer (3). The upper surface of the intermediate PET film layer (3) is provided with a second waterproof adhesive layer (31). The upper surface of the second waterproof adhesive layer (31) is provided with a second insulating ink layer (4). The upper surface of the second insulating ink layer (4) is provided with an upper PET film layer (41). The upper PET film layer (41) is provided with an edge sealing assembly (5) for sealing the edges.

2. The highly conductive flexible keyboard conductive film according to claim 1, characterized in that: The sealing assembly (5) includes a first sealing layer (51) disposed at the edge of the upper surface of the upper PET film layer (41), a second sealing layer (52) disposed at the edge of the bottom surface of the lower PET film layer (1), and a waterproof adhesive layer (53) jointly installed on the sidewalls of the first sealing layer (51) and the second sealing layer (52) close to each other.

3. The highly conductive flexible keyboard conductive film according to claim 2, characterized in that: The bottom surface of the first sealing layer (51) is fixed with a positioning ring (6), and the upper surface of the second sealing layer (52) is provided with a receiving groove (61) that matches the positioning ring (6).

4. The highly conductive flexible keyboard conductive film according to claim 3, characterized in that: Multiple first limiting pieces (7) are installed on the two inner walls opposite to each other of the first sealing layer (51).

5. The highly conductive flexible keyboard conductive film according to claim 4, characterized in that: Multiple second limiting pieces (8) are installed on the two inner walls opposite to each other of the second sealing layer (52).

6. The highly conductive flexible keyboard conductive film according to claim 5, characterized in that: The thickness of both the upper PET film layer (41) and the lower PET film layer (1) is 0.08-0.12 mm.

7. The highly conductive flexible keyboard conductive film according to claim 6, characterized in that: The first edge sealing layer (51) is made of EPDM rubber.

8. The highly conductive flexible keyboard conductive film according to claim 7, characterized in that: The second edge sealing layer (52) is made of EPDM rubber.

Images