| 摘要 |
PROBLEM TO BE SOLVED: To provide a ceramics circuit board where insulation between adjoining metal circuit boards is assured for stable and reliable operation. SOLUTION: A ceramics circuit board is provided where a plurality of metal circuit boards 3 are fitted to the upper surface of a ceramics substrate 1. Here, a voltage applied to the plurality of metal circuit boards 3 is 400 V or higher, a distance between the adjoining metal circuit boards 3 is 1.5 mm or less, and a curvature radius of an upper peripheral corner 3a of the metal circuit board 3 is 0.05 mm or larger to form an arc.
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