Membrane keyboards directly from the manufacturer

Membrane keyboards and their advantages

Membrane keyboards are applied across a number of are­as ranging from control units for domestic devices to high­ly sensitive medicine to ex­tre­me­ly resilient controls for production lines and machines. Technical and creative demands of a foil keyboard are very high, and we are happy to offer you the best solutions.


  • customized design
  • low installation height
  • tactile feedback for key confirmation
  • rugged and durable
  • resistant to most chemicals
  • resistant to dirt, dust and water

Membrane keypad structure options

A membrane keypad can be built according to the cust­om­er's requirements. It can contain not only snap domes, but also light diodes and slide-in pockets. Depending on the structure, it can have a height of approx. 0.9 to ap­prox. 2.0 mm.

Structure of a membrane keyboard, membrane layers Roos GmbH



Front membrane

  • resistant to most chemicals
  • individually configurable

Retaining membrane

  • fixes the installed metal snap domes

Spacer foil for switching level

  • self-adhesive spacer
  • positioning of the snap domes

Switching layer

  • printed electronic circuit
  • equipped with metal snap domes

Spacer foil for LED level

  • self-adhesive spacer
  • insulation of upper and lower switching foils

LED layer

  • printed electronic circuit
  • equipped with single and multicolour LEDs

Base adhesive

  • lower adhesive layer for fixing the membrane keypad

Customized front membrane design

The front foil design can be configured specifically for the customer or CI-linked. It is exactly reproduced according to your input by means of screen prin­ting or digital prin­ting. Of course, printed viewing panels, transparent co­lours, fade-effects and night design can be im­ple­mented without problems.

Foil keyboard without snap dome

In the keyboard two conductor foils are incorporated with a spacer. The lower foil has conductor tracks equipped with a button. The up­per foil is equipped with conductive contact points lying immediately above the button. If the foil with the contact point is pressed down, the circuit is closed.


Membrane keypads without snap domes

Membrane keypads with snap domes

Foil keyboard with snap dome

Membrane keyboards with snap domes enable better tac­tile res­pon­ses. When the key is activated, the metal snap dome is pressed down and it completes the circuit with two conductor tracks. In order to achieve greater tac­tile properties, key panels can be stamped in the design foil. For this reason we offer snap domes with various printing strength and sizes.


Slide-in technology for customer or country-specific marking

Depending on customer or country-specific marking, spe­cial insertion pock­ets can be worked into the key­board. With the help of printed strips a foil keyboard like this can be quickly and easily individualised.


Membrane keypads with plug-in strips

Membrane keypads with snap domes and LEDs + Membrane keypads with snap dials and LEDs on the same layer

Membrane keyboards with integrated LEDs

Super-thin LEDs, only 0.5 mm thick, are used to display the optical sta­tus. You have the option between one or mul­ti­ple colours in your LED. For this purpose, an addi­tional switching level with LEDs placed on it, is in­corpo­rated into the membrane keypad. In order to reduce the installation height, the switching surfaces for snap domes and LEDs can, under certain conditions, be accom­mo­dated on one switch­ing foil.


Shielding against EMI and ESD

To prevent elec­tro-magnetic interference (EMI) and electro-static discharge (ESD) the membrane keyboard can be equipped with shielding foils.

Reconstruction of damaged membrane keypads in short-run production

The failure of operating and input components can be caused by short-circuits, wear or similar problems. It is in such cases often impossible to simply repair the control panel. For this problem we have a simple solution. Thanks to our long experience, we are able to use your data or faulty design to produce an entire new membrane keypad complete with membrane switches

Connecting lug of a membrane keypad

Connection is made via a flexible foil cable with optional plug.

Together with you, we develop and produce solutions tailored to your area of application.


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