Tactile Metal Construction
95% of new membrane switch designs use metal domes for tactile feedback. The vast availability of different sizes, shapes and actuation forces, give you virtually unlimited design options. We can incorporate the domes into an assembly or supply a dome array to be placed onto your PCB.
Tactile Dome Characteristics and Definitions
Travel: The total distance the dome switch moves from its relaxed state to electrical contact.
Force: Actuation force, or trip force, is the amount of force that is necessary for the dome to "snap", changing the dome from the open position to the closed position. Typical actuation forces range from 40 grams, to 2,250 grams or higher depending on the size. The release force is the amount of force the dome exerts on itself to return to its relaxed state. The combination of actuation force and release force gives you the tactile ratio for a dome. The higher the tactile ratio, the "crisper" a dome feels when actuated.
Over-travel: Actuating the dome past its designed travel. For most domes, this is beyond the flat plane of the foot. Domes can be designed to over-travel.
Transition Ring: The transition ring is the visible ring on the top of the dome, where the dome radius transitions into the feet/legs of the dome. The transition ring is the hinge point of the dome that forces the dome back to its original shape after the dome has been depressed or snapped over.
Feet: The three or four points at which the dome is in constant contact with one half of the circuit.