| 摘要 |
PROBLEM TO BE SOLVED: To prevent the migration from occurring by widening the gap between two adjacent conductor patterns with a high voltage difference, compared with the gap between other two conductor patterns. SOLUTION: The printed board has an insulation board 1 having connecting parts 1b to be inserted in a connector 3, the parts 1b projecting from the body 1a, and three or more silver-containing conductor patterns 2a, 2b, 2c formed in mutually parallel on the connecting parts 1b. These patterns are connected to terminals of the connectors 3 and voltages are applied thereto. Among the conductor patterns, a first pair of adjacent conductor patterns 2a, 2b has the greatest mean voltage difference and a wider gap than the gap between a second pair of adjacent conductor patterns 2b, 2c.
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