(57) A membrane switch assembly (10) is comprised of spaced apart layers (12, 16) having
corresponding patterns of conductive switch contacts (28, 28') arranged in series
thereon, the layers (12, 16) being separated by spacing means (20) having openings
therein. The switch contacts (28, 28') on each layer are spaced along a single conductive
path (24, 24') so that a regular unit value of impedance means exists between the
switch contacts (28,28'). When the electrical circuit is completed by closing a switch
site, the resulting total impedance is essentially equal to the sum of the unit values
of the impedance means along the circuit path formed by the closed switch.
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