Membrane switch

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A membrane switch is an electrical switch for turning a circuit on and off. It differs from a mechanical switch, which is usually made of copper and plastic parts: a membrane switch is a circuit printed on a PET or ITO. The ink used for screen printing is usually copper / silver / graphite filled and therefore conductive.

The ASTM defines a membrane switch as a momentary switch device in which at least one contact is on, or made of, a flexible substrate.

A membrane switch typically has 6 or more layers. The top layer of a membrane switch is the graphic interface between the user and the machine. While other layers are essential to overall performance, it is a well designed and attractive graphic layer that impresses the user first. The other layers of the membrane switch need to support the graphic layer by providing the qualities and functionality you need [For a full design guide see http://rspinc.com/membrane-switches.php - RSP, Inc.].

[edit] Usage

Use in any electrical appliances in which the rebouncing feeling is not important. Classic applications includes microwave oven panel, air conditioner control panel, TV remote control etc. Tactile feedback of keys can be provided by embossing the top PET layer or embedding metal snap domes.

[For info see http://www.abatekgroup.com Abatek Group (Worldwide)]