[Capacitive film switch] Film panel surface sticker: Film keyboard product structure

[Capacitive film switch] Film panel surface sticker: Film keyboard product structure

1. Made by screen printing exquisite patterns and text on colorless transparent sheets such as PET and PC, because the main function of the panel layer is recognition and button function, the selected material must have high transparency, high ink adhesion, high elasticity, high toughness and other characteristics.

2. The main function of the surface adhesive layer is to tightly connect the panel layer with the circuit layer, thereby achieving a sealed connection effect. The thickness of this layer is generally required to be 0.05-0.15mm, with high viscosity and aging resistance; In production, specialized film switch double-sided tape is generally used. Some film switches require waterproofing and high temperature resistance, so different performance materials must be used for the adhesive according to the needs.

3. The control circuit of the upper and lower layers is made of polyester film (PET) and switch circuit graphics, which have good carrier performance. Special processes are used to screen print conductive silver paste and conductive carbon paste, which have conductivity properties. The thickness is generally between 0.05-0.175 millimeters, and the common Z is 0.125mm PET.

4. The interlayer serves as a sealing connection between the upper and lower circuit layers, typically using PET double-sided tape with a thickness of 0.05-0.2mm; When selecting this layer of material, full consideration should be given to the overall thickness of the product, insulation, tactile sensation of the circuit key package, and sealing performance.

5. The backing layer is closely related to the film switch and the type of material used for pasting, commonly including double-sided tape, 3M tape, waterproof tape, etc.

Thin film switch is a multi-layer structure (flat) type (unlocked) key switch composed of a certain elastic layer insulation material. Due to its beautiful appearance, long lifespan, and simple structure, it has been widely used in various industries, from small household appliances to high-tech products.

The membrane switch is mainly composed of a mask, mask adhesive, upper circuit, isolation layer, lower circuit, and adhesive, as shown in the "membrane switch structure" diagram. The mask layer, upper layer, and lower layer are all transparent films, mainly made of PC, PET, and PVC materials. The mask adhesive, isolation layer, and adhesive layer materials are all double-sided adhesives (commonly known as interlayers). Principle of membrane switch