| 摘要 |
PROBLEM TO BE SOLVED: To solve the problem that conventionally a crosswalk noise is generated between adjacent signal wirings when a wiring interval is narrowed in a multilayered circuit board, having a parallel wiring a group. SOLUTION: In the multilayered printed circuit board, a second insulating layer I2, having a second parallel wiring group L2 perpendicular to a first parallel wiring group L1, is laminated on a first insulating layer I1 having the first group L1. The first and second groups L1 and L2 are connected via a feedthrough conductor group T. The groups L1 and L2 respectively have a plurality of signal wirings S1 and S2 and power wirings P1 and P2 adjacent to the wirings S1 and S2 or ground wirings G1 and G2. The thickness of the wiring conductor of each of the wirings P1 and P2, adjacent to the wirings S1 and S2 or the wirings G1 and G2, is set larger than that of each of the wirings S1 and S2. Crosswalks between the wirings S1 and between the wirings S2 can be reduced effectively. |
