Calculator keyboard switch with disc spring contact and printed circuit board

摘要: A keyboard switch assembly including a printed circuit board having four terminals on one side of the board, three being arranged in triangle and fourth disposed within triangle. Conductors are respectively joined to interior terminal at least terminals. conductive, generally triangular, snap-acting dome member is provided arcuate apices, projections formed from apices engaging thereby spacing periphery element surface conductors thereon, conductor connected extending under dome. The has projection adjacent center thereof which registry with engages that when deflected completing an electrical between terminal. layer insulating material covers exclusive sheet opening therein receives locates member. Another first plate second push button element, depression actuating non-overcenter, position