| 摘要 |
PURPOSE:To exclude crosstalk noise and to improve heat dissipation properties by providing a metal plate having a hole whose diameter is larger than that of a through-hole to a position whereto front and rear conductor circuits are connected and an insulating coating electric wire provided to an inside of a groove. CONSTITUTION:A metal plate 1 is provided which has a groove 2 formed to a shape of a necessary wiring pattern and has a hole whose diameter is larger than that of a through-hole 7 in a position whereto front and rear two conductor circuits are connected. An insulating coating electric wire 3 is provided to an inside of the groove 2. A conductor pattern 6 is provided in opposition to the groove 2 of the metal plate 1, and insulating resin 9 is provided between a part of the through hole 7 and the metal plate 1. First, the groove 2 filled with a wire is provided to a surface of the metal plate 1, a hole is shaped and an interior thereof is filled with resin. Adhesive is applied onto the metal plate 1, an insulating wire is provided to the groove part, a copper foil is laminated, unnecessary copper foil is etched and removed, a through-hole is shaped, and an inside of the hole is metallized by plating. |
