| 摘要 |
PURPOSE:To prevent occurrence of cracks and fusion of a magnetic coating due to heat of soldering by a construction wherein a coil conductor is formed with a conductive coating made of a metal only and then it is covered with a magnetic coating. CONSTITUTION:A conductive coating 2 is applied to all over the surface of a rod-shaped ferrite core 1, and metal cap terminals 3 are snapped on both ends of the core 1. The part of the coating 2 which is not covered with the terminals 3, is cut from its one end along the axial direction to form a sprial coil conductor, so that it has the desired inductance. Then, a magnetic coating 4 comprising thermosetting resin and ferrite powder is formed all over the exposed conductive coating 2' which is not covered with the terminals 3. With this, it becomes possible to prevent occurrence of cracks and fusion of the magnetic coating due to heat of soldering when fixing the inductor direct onto a printed circuit board. |
