ALMAX Manufacturing

Rubber Keypad & Conductive Overlay Actuators

Rubber Keypad & Conductive Overlay Actuators

A rubber keypad membrane switch uses compression molded silicone rubber that has conductive carbon pills on rubber plungers. These rubber switches are compression molded creating an angled web around the center of the key.

When a key is pressed, the webbing around the switch collapses or deforms to produce a tactile response. When the pressure on the key is released, the webbing springs back to its original shape, providing positive feedback. The closure of the switch circuit occurs when the conductive pill or printed conductive ink makes contact to the lower circuit layer.