Switch assembly

Claim 1

A flexible switch assembly for providing a signal for use by solid state electronic logic circuitry, said switch comprising: A. a flexible face cover membrane having a plurality of openings therein; B. a flexible keyboard membrane positioned immediately below the face cover membrane and including a base portion and a plurality of raised hollow contact pad portions projecting upwardly from the base portion through the respective openings in the face cover membrane; C. a flexible printed circuit board membrane positioned below the keyboard membrane for switching coaction with said contact pad portions; D. adhesive means bonding said membranes together into a thin, flexible, sealed switch sandwich; E. said keyboard membrane being formed of a nonconductive ellastomeric material; and F. a plurality of conductive elastomeric buttons secured to the underside of each contact pad portion, respectively, for coaction with printed circuitry on the upper surface of the circuit board membrane, said buttons being normally disposed in the plane of said cover membrane within the openings therein and movable out of said plane into contact with said printed circuit board membrane, each contact pad portion having a mesa configuration and connected to the base portion of the keyboard membrane by sloping walls which are configured to allow the contact pad portion to move downwardly through the opening in said face cover membrane with a toggle action to transmit a positive tactile contact signal to the operator.