| 摘要 |
PROBLEM TO BE SOLVED: To provide a printed wiring board providing objective and correct evaluation of a skill level concerning manual soldering of a worker. SOLUTION: The printed wiring board includes a plurality of patterns for electronic components, pitches of which differ from one another. The plurality of patterns for electronic components has a plurality of component patterns corresponding to five kinds of skill levels (fourth grade to special grade). The plurality of component patterns corresponding to the third grade level include: a component pattern TP1 to which a diffusion pattern for diffusing heat supplied from a soldering iron to a part to be soldered during soldering; and a component pattern LED2 that impedes the insertion of the soldering iron from a +X side and a -X side when components LED1 and FIL1 corresponding to the fourth grade level are already mounted. COPYRIGHT: (C)2011,JPO&INPIT
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