| 摘要 |
<p>PROBLEM TO BE SOLVED: To obtain a multilayered printed board which can reduce unnecessary radiation of part of a clock, power or signal line, by making small a path of a return current when there is absent or missing a ground opposed to the clock, power or signal line. SOLUTION: The multilayered printed board includes a substrate 1, a grounding layer 3 provided on a rear surface of the substrate 1, a clock line 5 arranged on a front surface of the substrate 1 as straddling a cut-off part of a grounding layer 3, and a grounding line 7 arranged on a front surface of the substrate 1 astride the cut-off part in the vicinity of the clock line 5. Through-holes 8 for connection of both ends of the grounding line 7 to the grounding layer 3 are made in the substrate 1. Thereby unnecessary radiation can be reduced.</p> |
