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The working principle of membrane switch

- Dec 06, 2017 -

Membrane switch of


Generally speaking, the common membrane switch is mainly composed of six layers of material, in the order from the table to the panel, on the surface glue, circuit, the bottom of the isolation layer, the circuit and glue. The following respectively introduces the layers of structure:


(1) panel: panel is the "appearance" of the membrane switch, arranged in the appropriate button, on the basis of shape, through different color, design, key to the whole film switches necessary adornment effect. Panel floor of the main role is to identity and key role, so choose materials must have high transparency, high ink adhesion, high elasticity, prevent fold, etc.


: (2) on the circuit, the circuit, the circuit is electrical component of membrane switch, is also the "off" switch "key", its performance directly affects the switch electrical performance is good or bad, mainly by the thin film on a layer of conductive material and form. The switch is closed, the circuit on the necessary of two roles getting an electric shock, generally within 0.05-0.175 MM, the thickness of the most common is to use 0.125 MM PET.


(3) in rubber, plastic isolation layer, bottom: the three layer structure of the material are double-sided adhesive, because's position in the switch structure is different and has different names. Three layers of double sided adhesive by their level of different and has different thickness, this basically is according to the thickness of the switches, buttons, operating force.

the-working-principle-of-membrane-switchthe-working-principle-of-membrane-switch

The working principle of the membrane switch


Membrane switch is a key function, indicating device, instrument panel for the integration of an operating system. By the panel, the circuit and isolation layer, the circuit of four parts. Press the membrane switch, circuit contact deformation, down on the pad of the circuit under contact conduction, fingers, contact bounce back on the circuit, circuit disconnect, loop to trigger a signal. Membrane switch structure is rigorous, beautiful appearance, good sealing. With the characteristic of moisture proof, long service life, etc. Widely used in electronic communications, electronic measuring instruments, industrial control, medical equipment, automotive industry, intelligent toys, household appliances and other fields.


Membrane switch, the basic working principle is as follows: when the panel is not pressed, membrane switch is in normal state, the upper and lower contact shows off state, isolation plays a role of isolation layer on top and bottom line. When the panel is pressed, the circuit of the contact deformation down, and the circuit merge in making circuit conduction, after conducting lines to the external instrumentation (substrate) to signal, so as to realize its corresponding function; After the fingers, contact bounce back on the circuit, circuit disconnect, loop to trigger a signal.


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