| 摘要 |
<p>PROBLEM TO BE SOLVED: To ensure reliability by effectively avoiding an ignition of a board due to an ion migration by applying, for example, to each type portable equipment, a secondary cell pack or the like. SOLUTION: A circuit board comprises barrier layers 5A and 5B disposed at a core material 2 side of a site in which the ion migration may occur to prevent a carbonization to advance to the core material 2 side, and insulating layers 4A and 4B formed between the layers 5A, 5B and front layers 6A, 6B of a tracking resistant insulating material.</p> |
