The basic structure of the membrane switch

Film switch is a new type of electronic component integrating light, machine and electricity, which is a fundamental change in the appearance and structure of electronic products. Thin-film switches can easily replace buttons from traditional discrete components to perform operating system tasks more reliably. The film switch has strong waterproof, dustproof, oil proof and harmful gas erosion ability. It has the advantages of stable and reliable performance, light weight, small size, long service life, convenient assembly, the panel can be washed without hurting the word, rich color, beautiful appearance and so on. Many friends know little about the basic structure of the membrane switch principle. Come and see it with Ji Deoksung!

Generally speaking, the common film switch is mainly composed of six layers of material, from the outside to the inside in turn for the panel, the surface glue, the upper circuit, the isolation layer, the lower circuit, the bottom glue.

First, the basic structure of the film switch

1. Panel: The panel is the "coat" of the whole membrane switch. On the basis of reasonable arrangement of keys, through different colors, patterns, key shapes, play a necessary role in decorating the whole film switch. The main role of the panel is to play a signage and key role, so the selected material needs to have the characteristics of high transparency, high ink adhesion, high elasticity and resistance to folding.

2. Up and down circuit: The up and down circuit is the electrical components of the film switch, and also the "off" and "key" of the switch. Their properties directly affect the performance of switching appliances, which are mainly formed by printing a layer of conductive material on a thin film. The upper circuit and the lower circuit are the two electric shocks required for switch closure, and their thickness is generally within 0.05-0.175MM, 0.125MM PET is common.

3. Surface glue, isolation layer, bottom glue: these three layers of materials are double-sided glue, because of the different positions in the switch structure, so there are different names. Three layers of double-sided adhesive have different thickness according to their respective levels, which is mainly determined by the thickness of the switch and the operation force of the key.