| 摘要 |
PROBLEM TO BE SOLVED: To improve heat radiation effect of divided cores of a transformer or choke coil to a metallic base substrate. SOLUTION: A core member wound with coils 1 and 2 is divided into an upper core member 3 and a lower core member 4, and the lower core member 4 is brought into contact with the metallic base substrate 5. This coil device is so constituted that h1>h2, where h1 is the distance from the metallic base substrate 5 to the joining surface between the lower core member 4 and upper core member 3, and h2 is the distance from the joining surface to the top part of the upper core member 3.
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