| 摘要 |
PURPOSE:To prevent deformation of through holes in a laminate body by heating a green sheet, having through holes filled with carbon paste, in an oxidizing atmosphere to remove the carbon paste through burning. CONSTITUTION:A laminate body 1 includes through holes 5 filled with conductive paste for connection between wiring conductors 6, through holes 3 filled with carbon paste, and through holes 4 located near the surface and filled with carbon paste. The laminate body is heated in an oxidizing atmosphere at 400 deg.C for one hour to burn the carbon paste; as a result, the through holes 3 and 4 are emptied. After binder is removed, the laminate body is further heated and burned. The laminate body thus obtained is used as a multilayered printed circuit board, which has through holes and recesses without deformation, and connecting through holes and wiring conductors. |
