Patent ID: 8830022
Filing Date: 2014-09-09
Classification: H01F,Y10T

Abstract:
1. A reactor comprising: a coil; a core; and a case housing the coil and the core, the core including an inner core portion arranged inside the coil and an outer core portion partly or entirely covering the outside of the coil, the outer core portion being formed of a mixture of a magnetic material and a resin, wherein the coil is arranged such that the axial direction of the coil is substantially parallel to a bottom surface of the case, and wherein a difference in concentration of the magnetic material in the mixture in the outer core portion in the axial direction of the coil is smaller than a difference in concentration of the magnetic material in the mixture in the outer core portion in a direction along a side wall of the case, wherein the magnetic material in the outer core portion has a distribution of concentration in which the concentration decreases from a bottom-surface side of the case to an upper-surface side opposite to the bottom surface in the direction along the side wall, and the difference in concentration is larger than 0% and equal to or smaller than 45% with reference to the concentration at the bottom-surface side.