A method for manufacturing a build-up multi-layer
printed circuit board is disclosed in which a YAG
laser is used upon the formation of a via hole in the multi-layer
printed circuit board, such that it can have the following advantages: the manufacturing process would become simple; the component packaging density and freedom for the design of the board would be improved; and a high speed of
signal process would be ensured. The method for manufacturing a build-up multi-layer
printed circuit board includes the steps of: forming a first printed circuit pattern on a
copper clad laminate (CCL) by applying a general photo-
etching process, the CCL having a
copper foil on the one face thereof; stacking a resin-coated (on one face)
copper foil (RCC) on the CCL with the first printed circuit pattern formed thereon, and heating and pressing this structure; irradiating a YAG
laser to the board with said RCC stacked so as to form a via hole at a predetermined position by removing said RCC; carrying out an electroless and electro
copper plating on the board with the via hole formed therein to form a plated layer; and forming a second printed circuit pattern on said plated layer to electrically connect the
layers on which the first and second printed circuit patterns are formed.