Patent ID: 7304860

Claim:
A printed circuit board with thin film switches for a keyboard, comprising: an upper board having multiple circuit lines; a lower board having multiple circuit lines; an insulating separation positioned between the upper and lower boards and defining multiple through holes; and at least one thin film switches, each has two thin film conductive elements formed respectively on the upper and lower boards and connected to the circuit lines, wherein each thin film conductive element comprises: a center conductor being formed on the corresponding upper or lower board and aligned with one of the through holes in the insulating separation; at least two outer conductors formed on the corresponding upper or lower board, adjacent and coplanar to and distinct and spaced from the center conductor and aligned with a corresponding through hole, wherein each outer conductor is connected to the corresponding circuit lines of the upper or lower board; and at least two conductive lines being formed on the corresponding upper or lower board, coplanar to the center conductor and the at least two outer conductors and aligned with the corresponding through hole, wherein the at least two conductive lines are connected to the center conductor and respectively to the at least two outer conductors.