THE BASIC STRUCTURE OF THE MEMBRANE SWITCH（PART II）

Shrapnel placement ~Membrane Keyboard，Membrane Switch，Membrane Keypad.

The film switch consists of several components that work together to ensure its functionality. Let’s take a closer look at the basic structure of a film switch.

Panel: The panel serves as the outer layer or “coat” of the membrane switch. It not only arranges the keys in a logical manner but also enhances the overall appearance of the switch. The panel plays a crucial role in providing signage and acting as the keys. Therefore, it is essential to select a material that possesses qualities such as high transparency, excellent ink adhesion, elasticity, and resistance to folding.

Circuit for Switching: The switching circuit is responsible for the electrical components of the film switch and controls the "off" and "key" functions. The characteristics of these circuits have a direct effect on how well the switch works. Normally, a layer of conductive material is applied to a thin film to make the upper and lower circuits. Both circuits are essential for the switch to function properly and are typically between 0.05-0.175mm thick. The most commonly used material for this is 0.125mm PET.

Surface glue, isolation layer, bottom glue: These three layers consist of double-sided adhesive materials, each with a specific name based on its position within the switch structure. The thickness of these adhesive layers varies according to their respective levels, which primarily depends on the switch’s thickness and the required operation force of the keys.