Membrane Switch Keypad Construction

Graphic Overlay 

• • This layer is what the user sees and interacts with. In this example, the design is that of a keyboard.

  • Graphics are applied using either screen printing or digital printing methods. 

Adhesive 

• • This layer is used to join the graphic overlay layer and the dome retainer layer. 

Dome Retainer

• • This layer keeps the domes from the previous layer fixed in place.

Spacer and Metal Domes

• • This layer contains metal domes that, when pressed, complete the circuit. Concurrently, the spacer provides room for the domes beneath the graphic overlay.

Circuit

• • This layer contains the circuit- a set of conductive paths that are screen printed using a conductive ink. 

Mounting Adhesive

• • This layer is used to facilitate the assembly of the finished membrane switches to any device or machine. 

Applications

Membrane Keypads are found in many devices and machines from different industries such as:

• Home appliances (washing machines, microwave ovens, fridges, etc)

• Medical equipment (instruments, beds, monitoring systems, etc.)

• Food processing equipment (fryers, ovens, etc.)

• Industrial machinery