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Membrane switch design and keypad working principle

Before we understand the working principle of membrane switch, we should first understand what parts the membrane switch is composed of, only when we understand the composition of the membrane switch can we better understand the working principle of the membrane switch. We ask the staff of the membrane switch manufacturer to give you an introduction.  

Membrane Keypad


Generally speaking, the common membrane switch is mainly composed of six layers of material, according to the order from the surface to the inside are the panel, surface adhesive, upper circuit, isolation layer, lower circuit, bottom adhesive.


The basic working principle of membrane switch is as follows: when the panel is not pressed, the membrane switch is in a conventional state, its upper and lower contacts are disconnected, and the isolation layer plays an isolating role for the upper and lower lines; when the panel is pressed, the contacts of the upper circuit are deformed downward and reunited with the lower line to make the line conductive, and the conductive line gives the signal to the external connecting instrument (substrate) to realize its corresponding function; when the finger is released , the contacts of the upper circuit bounce back, the circuit is broken and the circuit triggers a signal.