Metal working – Method of mechanical manufacture – Electrical device making
Patent
1986-03-11
1987-09-01
Echols, Percy W.
Metal working
Method of mechanical manufacture
Electrical device making
156 87, 29412, 29830, H01H 1104
Patent
active
046898794
ABSTRACT:
A membrane keyboard construction and method of making the same are provided, the membrane keyboard construction comprising two circuit layers, a spacer disposed and secured between the circuit layers and having an opening passing therethrough to permit the circuit layers to be pressed together in the opening and thereby provide a switching function, a face plate, and an adhesive layer disposed between the face plate and one of the circuit layers and securing the face plate to the one circuit layer, the adhesive layer having a passage therein and leading from an area thereof that is aligned in superimposed relation with the opening to the exterior of the construction to vent that area thereof. The area is isolated from the opening by the one circuit layer and is vented by the passage to tend to enhance tactile feel and avoid false switch closure of the opening by tending to prevent entrapment of air bubbles in the area.
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Echols Percy W.
Robertshaw Controls Company
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