Membrane keypads

Membrane keypad called also the foil keypad – consisted of many layers of films, with different properties and functions, combined with adhesive overlays.

The basic elements of the membrane keypad

Graphic overlay – is the first layer covering the keypad on the outside. It is responsible not only for protection but also for attractive design. It is printed from the inside. The graphical possibilities are almost limitless here. The film can be made of polycarbonate or polyester. In our practice, polyester films are much more effective, because they are more flexible and resistant to external factors. We recommend them in particular for more demanding and professional applications. The first layer can be subjected to additional processing, e.g. make stamping or print with structural lacquers. Depending on the varnish used, we can give the keypads appropriate texture: glossy, antiglare or hard coated.

Circuit layer – a key layer for keypad operation is a polyester film, on which the paths and contact pads are printed. The circuit layer can also be stamped to form polyester membranes, i.e. the element which gives the impression of being clicked when pressed,

Spacers and adhesive layer – adhesives which are double-sided self-adhesive polyester films covered with a layer of acrylic adhesive. They are used for gluing different films and circuit layer together, also for the keypad to the enclosure or supporting plate mounting.

Metal domes  – specially formed metal switching elements, mounted into a silver circuit. With pressing and “click” they cause short-circuit and switching given function.

• Additional elements may be for example SMD LEDs.

 Advantages

– many design possibilities (customization)

– aesthetics

– durability

– resistance to external factors: atmospheric, chemical and mechanical

– low price in large series

– extremely thin construction.

Membrane keypad application

The membrane keypads are widely used in both domestic and industrial devices, e.g. in control and measurement equipment, in control systems as well as in the military, medical and automotive industries.

Design and production technology offers many possibilities and different properties.

Exemplary constructions

embossed keypad with laminated window

frame embossed keypad with a metal dome

spherically embossed keypad with EMI / RFI

Exemplary membrane keypads

Technical information

Design

TABLE OF POPULAR REAGENTS WHICH MEMBRANE KEYPADS AND FRONT FOILS SURFACE ARE RESISTANT TO

Thanks to our many years of experience and knowledge, they are constructed in such a way that they ensure trouble-free operation.

All keypads are made in 6W technology, with using 6 layers. This technology and proper chose construction makes our products work for many years, even in tough climatic conditions.

Installation instructions for the membrane keypad

LC Elektronik offers many solutions. Choose from different technologies and find the best one for yourself