What are Capacitive Switches?
A capacitive switch detects the presence or absence of a conductive object, such as a finger, by measuring changes in capacitance. There are no mechanical components within the switch eliminating any potential mechanical failure and offering excellent durability in even the harshest environments.
Capacitive Switch Construction:
A capacitive switch consists of three main layers, the graphic overlay, the circuit, and the backer:
- The overlay consists of the graphic artwork and can also include windows, embossing, coatings, adhesives, and selective texturing.
- The circuit switch will either be a Flexible Printed Circuit or a Printed Circuit Board.
- The backer is the final part of the capacitive switch, and may or may not include an adhesive that must bond to your specific substrate. The most common materials used for overlays are plastic, acrylic, and glass due to their durability and versatility.
Advantages of the Capacitive Switch Technology:
Very low or no actuation force can be achieved. Competing switch technologies typically require at least five ounces of pressure in order to activate the switch. With integrated capacitance switch technology, there are no minimum actuation force requirements. In fact, switches can be designed to activate as the user comes within proximity of the switch
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