matrix membrane keypad
1. Overlay materials:
A variety of overlay materials are used in membrane switch appliactions. Different material performs differently. Often, PET(Polyester) and PC (Polycarbonate) are more suggested.
2. Tactile feedback for button switches
For obtaining a good feedback from the buttons, there are usually two methods to make it.
A. Raising certain areas of the graphic overlay by tooling can be offered --Poly Domes. And the shapes and styles of the embossing can be various flexibly. Common hard-tooled embossing types include: Ring embossing, pillow embossing and dome embossing .
B. Adding extra parts on the switch to get the crisp effect--Metal domes. Metal domes can be provided in several different sizes according to the switch sze.
3.Cut-outs
For some products, it needs holes and cutouts to meet its final application. Usually, these cutouts are achieved by laser cutting machine and hard tooling punching.
4. Flat flexible cable
As a keypad, it is usually required to have conductive performance. It is the circuit called in the membrane industry. it can be flexibly designed on a polyester sheet with silver conductivity printed. Also it can be copper etched for a better stability in the performance.
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