METHOD OF MAKING THROUGH HOLE WITH LASER COPPER-CLAD LAMINATE SUITABLE FOR MAKING HOLE AND AUXILIARY MATERIAL FOR MAKING HOLE

摘要

The present invention relates to a method of manufacturing a small-diameter through hole having high reliability with respect to a hole wall at a high speed by the energy of a carbon dioxide gas laser without forming any hole in a copper foil in advance, At least one powder selected from the group consisting of a metal compound powder, a carbon powder and a metal powder having a melting point of at least 900C and a binding energy of at least 300 KJ / mol, To 97% by volume of the organic substance is formed or arranged on at least one copper foil surface to be irradiated with a carbon dioxide gas laser, Irradiating the surface with a pulsed carbon dioxide gas laser; The auxiliary material used when a through hole is made in a copper-clad laminate with a carbon dioxide gas laser is a metal compound powder, a metal powder having a melting point of at least 900C and a binding energy of at least 300 KJ / mol, Is a coating or sheet of an organic material containing 3 to 97% by volume of at least one powder selected from the group consisting of: