How do you secure metal domes in a membrane switch? In a membrane switch/keypad, metal domes are usually secured by the adhesive spacer layer or a dedicated dome-retainer layer. The best method depends on whether you are using individual domes or a dome array. The retainer layer has openings or pockets that locate each dome. The adhesive around the opening holds the dome from moving laterally while allowing it to snap/collapse vertically when pressed. Important design rule The dome should be laterally constrained but vertically free to move. The most important point is that you should not glue the dome itself to the circuit. The adhesive should secure the perimeter/retainer, while the dome remains free to snap. More info visit:www.jcftechnology.com















