Membrane Switch surface sticker: Membrane Keypad product structure

Membrane Switch surface sticker: Membrane Keypad product structure

1, PET, PC and other colorless transparent sheet screen printing exquisite patterns and text made, because the main role of the panel layer is the role of identification and buttons, so the selected material must have high transparency, high ink adhesion, with high elasticity, high toughness and other characteristics.

2,The main function of the surface bonding layer is to closely connect the panel layer and the circuit layer, so as to achieve the effect of sealed connection. The thickness of the layer is generally required to be between 0.05-0.15mm, high viscosity and anti-aging; In the production, the general use of special membrane switch double-sided tape, some membrane switch requirements can be waterproof and high temperature resistance, so the glue must also use different properties of materials according to the need.

3, the upper and lower two layers of the control circuit using polyester film (PET) and switching circuit graphics of the carrier performance is good, with a special process screen printing conductive silver paste, conductive carbon paste, with conductive properties, its thickness is generally 0.05-0.175 mm, The common is 0.125 mmPET.

4, interlayer in the upper circuit layer and the lower circuit layer play a sealing connection role, generally using PET double-sided tape, its thickness is 0.05-0.2mm; In the selection of this layer of material should be fully considered the overall thickness of the product, insulation, circuit key package feel and tightness.

5, the back layer is closely related to the membrane switch and what kind of material to paste, common double-sided tape, 3M glue, waterproof glue and so on.

The membrane switch is a multi-layer structure (plane) type (lockless) key switch composed of a certain elastic layer insulating material. Because of its beautiful appearance, long life, simple structure and other characteristics, it is widely used in all walks of life, from small home appliances to high-tech products.

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

Membrane Switch principle

When the mask layer is not pressed, the isolation layer acts as an isolation on the upper and lower lines. When the mask layer is pressed, the top line is pressed together and overlaps the bottom line so that the line is opened. After connecting, it sends a signal to the external connected instrument (set by the user) to realize the corresponding function.