| 摘要 |
PURPOSE:To radically reduce undesired radio wave radiated from loaded parts by applying insulation coating to cover both conductive pattern and loaded parts on a printing board followed by further covering the insulation coating with conductive coating, and further followed by connecting this conductive coating to a power ground. CONSTITUTION:After loading conductive pattern 2 for signal lines of a printing board 1 with parts such as IC 3 and chip parts 4, insulation coating is applied thereto, the insulation coating is further covered with conductive coating 9, and the conductive coating 9 is electrically connected to conductive coating 6 and also to power ground 15. Thus, by covering both the conductive pattern and the loaded parts with the insulation coating, further by covering the insulation coating with the conductive coating, and furthermore electrically connecting the conductive coating to the power ground, the printing board is entirely shielded and hence undesired radio wave radiated from all the parts with which the printing board is loaded is radically reduced. |
