Membrane switch for keypad, keyboard Molex

A membrane switch, or membrane keyboard, is most often described as a thin, low profile, micro motion front panel assembly utilizing one or more layers of polyester, with screen printed conductors printed on each layer. The switch assembly is generally built with pressure sensitive adhesives to bond the polyester layers together.

When two or more circuit layers are designed into the switch panel, the adhesive spacers both separate and attach the conductive layers. Additionally, they provide the openings needed to allow for a switch closure between the two separated layers. Other options that are often provided on the front panel include an adhesive mounting sheet to attach the keypad to a housing or sheet metal bracket, and a graphic overlay. The graphic is used to provide the cosmetic appeal that is most often associated with a membrane switch assembly.

Tactile membrane switches are either stamped and plated metal contacts, or embossed polyester contacts, used in conjunction with a front panel assembly. The tactile element is generally part of the switch system: enclosed in the switch assembly to provide a "snap" or tactile response when the switch is actuated.

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