AUXILIARY SHEET FOR CARBON DIOXIDE LASER BORING

PROBLEM TO BE SOLVED: To obtain an auxiliary sheet for boring which is for boring a small-diameter blind via hole and/or a through-hole by irradiating especially a thin copper-clad plate with a carbon dioxide laser and which can be laminate-bonded on the rear face of the copper-clad plate at room temperature. SOLUTION: A substance, in which an adhesive agent is added to a resin composition, is bonded to an organic film. It is made as the auxiliary sheet for boring. It is arranged on the surface of the copper-clad plate and it is laminate-bonded at room temperature. The through-hole is bored by directly irradiating the surface of the copper-clad plate with the carbon dioxide laser. The lamination is executed at room temperature. Accordingly, there is no warpage during the lamination. The small-diameter hole with an excellent hole shape can be bored at high speed with the carbon dioxide laser. Even when the auxiliary sheet for boring is peeled off, it can be easily peeled off without the occurrence of break of the thin copper-clad plate. It is obvious that the auxiliary sheet for the carbon dioxide laser boring is excellent in workability and mass productivity. COPYRIGHT: (C)2004,JPO&NCIPI