| 摘要 |
PROBLEM TO BE SOLVED: To provide an air-core coil that is easily manufactured, has a large number of windings, and further suppresses generation of induced electromotive force due to outside electromagnetic field. SOLUTION: The air-core 1 is provided with an insulating substrate 2, and a coil wire 3 embedded into the insulating substrate 2. The insulating substrate 2 has a substrate opening part 4. The coil wire 3 has a basic coil part 5 wound around the circumference of the substrate opening part 4, and an overlaid coil part 7, having an overlaid winding part 6 wound by surrounding the basic coil part 5. The basic coil part 5 and the overlaid winding part 6 are connected to each other in series. A conductor, in which current flows penetrates the substrate opening part 4, the basic coil part 5 and the overlaid winding part 6 are connected to each other so that the induced electromotive force caused by the current is not canceled. Since the basic coil part 5 and the overlaid winding part 6 are overlaid and wound on one insulating substrate 2, the number of winding of the coil wire 3 is increased, and the induced electromotive force is increased. COPYRIGHT: (C)2004,JPO
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