Many options are available for shielding membrane switches.
Printed Shield
Either carbon or silver can be printed over the top of the circuit to act as a shield or aluminum foil can be used. Carbon shields are less expensive than silver. A printed grid pattern is normally used to reduce cost and can be terminated to the circuit tail.
Aluminum
Aluminum foil material is the most conductive shield available but the most expensive. A foil shield adds an additional layer to the membrane switch construction. The foil termination requires a separate tail for ground connection.
Top Surface Shielding
Graphic overlay ESD material can be another option. Contact General Label for termination requirements.
Additional Options
ITO coated polyester can be used to provide a conductive surface for clear window areas. ITO is transparent and is used with other shielding options.
Design of the shield on a membrane switch depends greatly on your requirements. Termination options can use an electrical termination, aluminum ground tail or by using conductive PSA.
