| 摘要 |
PROBLEM TO BE SOLVED: To check a place where radio wave noise occurs and to suppress the occurrence of radio wave noise by installing a clearance chain detected by a first detection means and a second detection means detecting a signal wiring pattern on a wiring layer above or below a layer where the chain exists. SOLUTION: In a clearance chain check 3, wiring pattern data 8, clearance coordinate data 9 and check condition data 10 are inputted, the chain relation of mutual clearances is checked and check result data 11 is generated. A printed wiring board designer displays check result data 11 by using a display device 12 with check result display 4, and verifies the occurred place of radiation noise. A system returns to parts arrangement 1 and the arrangement of parts is corrected or the system returns to wring design 2 and a wiring pattern is corrected against the part of a trouble with error judgement 5. Thus, the cause of radiation noise occurrence can be reduced in a printed wring board design state. |
