Patent ID: 6534723
Filing Date: 2003-03-18
Classification: H01L,H05K

Abstract:
A multilayer printed-circuit board formed by stacking a plurality of circuit boards on each other, each of said plurality of circuit boards including a hard insulative substrate comprising two sides, and at least one conductor circuit formed on at least one of said two sides, and a plurality of via-holes each comprising a hole formed through the hard insulative substrate extending to the at least one conductor circuit, and each filled with a conductive substance; applying an adhesive between the plurality of circuit boards, and heating and pressing the plurality of circuit boards together forming stacked circuit boards having two outermost circuit boards;one of the outermost circuit boards having formed on the surface thereof at least one conductive bump positioned right above a via-hole and electrically connected to the via-hole; the other outermost circuit board having formed on the surface thereof at least one conductive pin or ball positioned right above a via-hole and electrically connected to the via-hole; and a distance between neighboring via-holes formed in each of the circuit boards increases from one circuit board to another.