Membrane key switch

Abstract

The utility model discloses a film key switch, which relates to the technical field of switches and comprises a circuit substrate, a plurality of metal domes and a plurality of circuits. Wherein the plurality of metal domes are arranged on one surface of the circuit substrate, one side of the circuit substrate is provided with a strip-shaped part, the plurality of metal domes are respectively connected with one ends of the plurality of lines, the other ends of the plurality of lines are all distributed to the end part of the strip-shaped part, and the plurality of lines are all copper foil lines. According to the utility model, the improved circuit board is made of a flexible material and is coated with a copper foil, so that the reliability of the product is greatly improved, the waterproof performance is realized, and the protection level can reach IP67 level; according to the improved flexible circuit board, the circuit is formed through copper foil coating, the circuit can be manufactured in one step, a traditional silver paste circuit does not need to be printed, and the problem that traditional printing is poor in consistency is completely eradicated.

Description

Technical Field

[0001] The utility model relates to the technical field of switches, in particular to a membrane key switch. Background Art

[0002] The membrane key switch is a PET sheet with contacts (including metal springs, also called pot pieces), which is used as a switch on circuit boards such as PCB and FPC, and plays an important role as a tactile switch between the user and the instrument.

[0003] Traditional membrane key switches use circuits printed with silver paste, which are unreliable for long periods of time and are not resistant to bending fatigue. The circuit wires are prone to breakage, and the LED lights heat up for a long time and are prone to falling off, causing product failures. Summary of the invention

[0004] The utility model aims to provide a membrane key switch, which solves a series of problems caused by the circuit printed with silver paste material used in the traditional membrane key switch.

[0005] The utility model solves the above technical problems through the following technical solutions. The utility model includes a circuit substrate, a plurality of pot pieces and a plurality of circuits; wherein:

[0006] A plurality of the pot pieces are arranged on one side of the circuit substrate, one side of the circuit substrate has a strip portion, the plurality of the pot pieces are respectively connected to one end of the plurality of the circuits, the other ends of the plurality of the circuits are distributed to the end of the strip portion, and the plurality of the circuits are copper foil lines.

[0007] Preferably, the circuit substrate is made of polyimide film material.

[0008] Preferably, a flexible layer is laminated on a surface of the circuit substrate close to the pot piece.

[0009] Preferably, the flexible layer is a PC plastic mask.

[0010] Preferably, the other side of the circuit substrate is provided with 3M adhesive.

[0011] Preferably, a heat sink is provided on the 3M adhesive backing, and the heat sink includes heat sink fins arranged in multiple rows, and the heat sink fins in each row are evenly spaced.

[0012] Preferably, the heat dissipation fins are made of aluminum material.

[0013] Preferably, the heat dissipation fins are of a triangular structure.

[0014] Compared with the prior art, the beneficial effects of the present invention are:

[0015] 1. The improved circuit board is made of flexible material and covered with copper foil, which greatly improves the reliability of the product and is waterproof, with a protection level of IP67;

[0016] 2. The improved flexible circuit board has a circuit that is formed by copper foil cladding, which can be completed in one step. It does not need to print traditional silver paste circuits, eliminating the problem of poor consistency of traditional printing. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the utility model.

[0018] Figure 2 for Figure 1 Schematic diagram of the structure at point A in the middle.

[0019] The numbers in the figure represent:

[0020] 1-circuit board; 2-heat sink fin; 3-flexible layer; 4-3M adhesive; 5-pot; 6-circuit. DETAILED DESCRIPTION

[0021] The above and other technical features and advantages of the present invention are described in more detail below in conjunction with the accompanying drawings.

[0022] Embodiment 1

[0023] This embodiment provides a technical solution: a membrane key switch, such as Figure 1 As shown, it includes a circuit substrate 1, a plurality of pot pieces 5 and a plurality of circuits 6.

[0024] A plurality of pot pieces 5 are arranged on one side of the circuit substrate 1. The number and distribution of the pot pieces 5 are set according to the actual product needs. One side of the circuit substrate 1 has a strip portion, which is used to pull to the relevant components for electrical connection. It can be easily bent, and is more flexible to use and easy to install. The plurality of pot pieces 5 are respectively connected to one end of the plurality of lines 6, and the other ends of the plurality of lines 6 are distributed to the end of the strip portion. The plurality of lines 6 are copper foil lines, and the copper foil lines are completed by machine etching in one step, which can avoid the problem of poor consistency caused by the traditional printing process.

[0025] The circuit substrate 1 is made of a polyimide film material, which is a flexible material, so that the key switch is soft as a whole and has high bendability.

[0026] A flexible layer 3 is laminated on one side of the circuit substrate 1 close to the pot 5. The flexible layer 3 can isolate water. The flexible layer 3 is a PC plastic mask.

[0027] The other side of the circuit substrate 1 is provided with 3M adhesive 4, which is used to seal the other side of the circuit substrate 1 and also plays a protective role to prevent the other side of the circuit substrate 1 from being scratched by foreign objects and causing unnecessary damage.

[0028] The improved circuit board in this embodiment is made of flexible material and covered with copper foil, which greatly improves the reliability of the product and is waterproof, with a protection level of IP67;

[0029] In the improved flexible circuit board of this embodiment, the circuit 6 is formed by copper foil cladding, which can be completed in one step without printing the traditional silver paste circuit, thus eliminating the problem of poor consistency of traditional printing.

[0030] Embodiment 2

[0031] This embodiment is further optimized on the basis of the above embodiment, and the same parts as the above technical solution will not be repeated here. Figure 2 As shown, in order to better realize the present invention, the following setting is particularly adopted: In order to increase the heat dissipation effect of the circuit substrate 1, a heat sink is arranged on the 3M adhesive 4 in this embodiment to increase the heat dissipation effect of the circuit substrate 1. The heat sink includes multiple rows of heat dissipation fins 2, and each row of heat dissipation fins 2 is evenly spaced, so that the circuit substrate 1 has a bendable performance. The heat dissipation fins 2 are made of aluminum material, and the aluminum material has good heat dissipation performance. The heat dissipation fins 2 are triangular structures, and the heat dissipation fins 2 in adjacent rows are staggered one by one, which can avoid the problem of interference between the heat dissipation fins 2 in adjacent rows when the circuit substrate 1 is bent.

[0032] The above are only preferred embodiments of the present invention, which are only illustrative and not restrictive. Those skilled in the art understand that many changes, modifications, and even equivalences may be made to the present invention within the spirit and scope defined by the claims of the present invention, but they will all fall within the scope of protection of the present invention.

Claims

1. A membrane key switch, characterized in that: It includes a circuit substrate, a plurality of pot pieces and a plurality of circuits; wherein: A plurality of the pot pieces are arranged on one side of the circuit substrate, one side of the circuit substrate has a strip portion, the plurality of the pot pieces are respectively connected to one end of the plurality of the circuits, the other ends of the plurality of the circuits are distributed to the end of the strip portion, and the plurality of the circuits are copper foil lines.

2. The membrane key switch according to claim 1, characterized in that: The circuit substrate is made of polyimide film material.

3. The membrane key switch according to claim 1, characterized in that: A flexible layer is laminated on one side of the circuit substrate close to the pot piece.

4. The membrane key switch according to claim 3, characterized in that: The flexible layer is a PC plastic mask.

5. The membrane key switch according to claim 1, characterized in that: The other side of the circuit substrate is provided with 3M adhesive.

6. The membrane key switch according to claim 5, characterized in that: A heat sink is arranged on the 3M adhesive backing, and the heat sink includes a plurality of rows of heat sink fins, and the heat sink fins in each row are evenly spaced.

7. The membrane key switch according to claim 6, characterized in that: The heat dissipation fins are made of aluminum material.

8. The membrane key switch according to claim 6 or 7, characterized in that: The heat dissipation fins are of a triangular structure.

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