| 摘要 |
Provided is a coil component comprising: a coil which includes an inner circumferential surface, an outer circumferential surface and, continuous therewith, a pair of end surfaces; and a core that surrounds the perimeter of the coil. In a cross-section in which the coil component is cut on a plane that includes the winding axis of the coil and a magnetic path that follows a winding path inside the core, when each periphery of the cross-section of the coil is divided into eight regions 41-48 by four straight lines 31-34 which follow the inner circumferential surface, the outer circumferential surface and the end surfaces, the following are provided as the core: first core members that are respectively disposed in four regions 41, 43, 45, 47 positioned in the corners of the coil component; second core members that are respectively disposed in a region 42 positioned on the inner side of the inner circumferential surface, and a region 46 positioned on the outer side of the outer circumferential surface; and third core members that are respectively disposed in regions positioned on the outer side of the end surfaces. The second core members and/or the third core members have, in a zero magnetic field, a magnetic permeability which is lower than that of the first core members. Due to this configuration, an increase in AC copper loss due to magnetic flux leak from a magnetic resistance unit is suppressed. |
