| 摘要 |
PURPOSE: To achieve contact and contact bonding to an opposing conductor circuit layer by allowing a protrusion to break through an insulator resin layer with the pressure obtained by pressing a lamination body using a press tool plate. CONSTITUTION: A protrusion 112 for connecting first and second conductor layers, a protrusion 122 for connecting second and third conductor layers, and a protrusion 132 for connecting third and fourth conductor layers break through an insulator 120 between the first and second conductor layers, an insulator 130 between the second and third conductor layers, and an insulator 140 between the third and fourth conductor layers, thus achieving contact to a second conductor layer 121, a third conductor layer 131, and a fourth conductor layer 141, respectively, for improved contact bonding. The insulator layer between conductor layers is a sheet made of insulation resin and the protrusion for connecting conductor layers is formed by electrolytic plating. |
