Metal dome arrays are a tactile interface between the user and keyboard. They are made of a pre-cut polyester adhesive and domes (polyester adhesive 0.05mm thick with a 0.03mm thick sheet of acrylic adhesive).
Dome arrays are applied to the PCB after peeling off the backing and aligning the array in one single operation.
2 types of arrays are mainly used: arrays with KISSCUTS (series of cuts around the dome in the polyester for a better adherance & ventilation of the dome) and arrays with P.A.S., an additional layer applied under the retaining layer with
channels enabling a higher volume of air around the dome.
It is a polyester carrier with pre-positioned domes. It can be described as a custom made array according to the specification of our customers.
The array will make it possible to place at once all the keys of your MMI switch. This you will avoid all problems related to dome positionning, lacking dome double or reverse dome.
The array with kiss cuts is an array with a series of cuts in the polyester/adhesive carrier around the dome. It is considered as a standard product. However, P.A.S. arrays tend also to become a standard. It depends on the usage.
P.A.S. (Pre-assembled spacer). It is an additional layer applied under the retaining layer with channels enabling a volume of air around the dome. The spacer can be made of different materials, for example with polyester 0.1mm thick or transparent PET 0.1mm thick.
The ventilation is made via channels in the spacer layer connecting the various dome chambers.