Patent ID: 8922327
Filing Date: 2014-12-30
Classification: H01F

Abstract:
1. A reactor comprising: a coil formed by winding a wire; a magnetic core that is disposed inside and outside of the coil and forms a closed magnetic circuit; and a case that has an opening portion and a bottom surface that opposes the opening portion, an assembly of the coil and the magnetic core being housed in the case, wherein at least the opening portion of the case side of the magnetic core is formed of a molded solid body that contains magnetic powder and resin, wherein a surface layer is provided on a surface of the magnetic core on the opening portion of the case side, the surface layer preventing the magnetic powder from rusting, wherein the surface layer has a resin portion formed of resin similar to the resin contained in the magnetic core, the resin portion being formed so as to be continuous with the resin contained in the magnetic core without an interface formed therebetween, wherein the resin portion of the surface layer and the resin contained in the magnetic core are integrated with each other in tight contact, wherein the molded solid body covers at least part of an outer periphery of the coil, and wherein the magnetic powder contained in the molded solid body is sparsely distributed on the opening portion of the case side and densely distributed on the bottom surface of the case side.