The operator panels of many devices have membrane switch, which is widely used in electronic communication, electronic measurement, industrial control, medical equipment, automotive industry, smart toys, household appliances and other fields.
With the multi-layered structure, membrane keypad made of flexible insulating material, which function are switching, indication and control. The function of membrane switch is realized by the vertical movement of the elastic membrane. Although the elastic film is deformed million times, the suitable material and the slight deformation(only 0.1-0.3mm) make it possible to have a long life. Membrane Switch have the characteristics of beautiful appearance, long service life, simple structure, easy installation and good user experience, which make it widely used in various industries, from household appliances to high-tech products, slowly replacing some of the touch switch and occupying a huge share in the market.
The membrane switch is mainly composed of 6 layers, which are the graphic overlay, graphic adhesive, upper circuit layer, adhesive separator(with metal dome), lower circuit layer and adhesive bottom layer.
When the membrane switch in the normal state, the upper circuit layer and lower circuit layer are separate by the adhesive separator. Once the switch is pressed, the contact of upper circuit deforms and recombine with the lower to make the whole circuit conductive, which will sign to external instruments to achieve their corresponding functions.