DOPPELSEITIGE LEITERPLATTE UND VERFAHREN ZU DEREN HERSTELLUNG

摘要

A double-sided wiring board provides an electric connection between two wiring layers with the use of a recess, thereby improving a reliability on electric connection more than the related art, and a manufacture therefor. The double-sided wiring board (100) has a recess (106) blocked at the side of a first face (101a) and opened to a second face (101b) of an insulator (101). A laser light is irradiated to a blockage part (1061) of the recess (106), whereby a rough exposed face (1031) without a foreign matter (107) remaining is formed to a first conductive layer (108). A second wiring layer (105) is formed to be connected to the exposed face (1031) and electrically connected to the first conductive layer (108). The first conductive layer (108) and the second wiring layer (105) are more tightly connected than in the related art through the connection at the exposed face (1031). Reliability of the electric connection between the wiring layers is improved in comparison with the related art.