What Is The Structure Of The Membrane Switch

Panel layer
The panel layer is generally made of fine patterns and text on colorless light-transmitting sheets such as PET and PC less than 0.25MM. Because the main role of the panel layer is to play the role of logo and key, the selected material must have high transparency , High ink adhesion, high elasticity, high toughness and other characteristics.
Surface layer
The main function of the surface adhesive is to closely connect the panel layer and the circuit layer to achieve the effect of sealing and connection. This layer generally requires a thickness between 0.05-0.15MM, which has high strength and anti-aging properties; In general, special membrane switch double-sided adhesive is generally used, and some membrane switches require waterproof and high temperature resistance, so the surface adhesive must also use materials of different properties according to needs.
Control circuit upper and lower layers
This layer uses a good performance polyester film (PET) as the carrier of the switching circuit pattern and uses a special process to screen-print conductive silver paste and conductive carbon paste on it to make it conductive. Its thickness is generally 0.05-- Within 0.175MM, the most common is 0.125MM PET. [3]
Laminated layer
It is located between the upper circuit and the lower circuit layer and plays the role of sealing and connection. Generally, PET double-sided tape is used, and its thickness varies from 0.05 to 0.2MM; when choosing this layer of material, the whole product should be fully considered Thickness, insulation, feel and tightness of circuit button package. [3]
Back adhesive layer
The use of adhesive is closely related to the material to which the membrane switch is attached. Commonly used are double-sided adhesive, 3M adhesive, waterproof adhesive, etc.