| 摘要 |
A printed circuit board comprising an insulating substrate, a via hole (16) formed in the insulating substrate, an implant material (15) filled in the via hole, and wiring patterns formed on the opposite surfaces of the substrates and electrically connected by the implant material, wherein the implant material is selected from a group consisting of acid-free copper, phosphorus-deoxidized copper and tough-pitch copper. Since the via hole comprises high-heat-resisting acid-free copper, phosphorus-deoxidized copper and tough-pitch copper, the printed circuit board is not likely to be deteriorated even when exposed, as is often the case, to a condition that heating/cooling between high temperatures and low temperatures is repeated, and can be used for an extended time while keeping an excellent heat resistance. |
