Patent ID: 9620270
Date: 2017-04-11
CPC Classifications: H01F

Claim:
1. A composite magnetic core comprising a combined body of a compressed magnetic body, obtained by compression-molding magnetic powders, which is combined with an injection-molded magnetic body obtained by mixing a binding resin with magnetic powders having surfaces thereof electrically insulated and by injection-molding a mixture of said magnetic powders and said binding resin, wherein said injection-molded magnetic body constitutes a housing, and said compressed magnetic body is disposed inside said housing, wherein said compressed magnetic body is obtained by compression-molding (i) said magnetic powders or (ii) powders, consisting of said magnetic powders, which have been mixed with thermosetting resin to form a compressed powder compact and firing said compressed powder compact, wherein said magnetic powders of said magnetic body are ferrite powders, wherein a mixing ratio of said magnetic powders of said compressed magnetic body is set to 96 to 100 percent by mass based on a total of an amount of said magnetic powders of said compressed magnetic body and that of said thermosetting resin, wherein said magnetic powders of said injection-molded magnetic body are amorphous metal powders, and said binding resin is a thermoplastic resin wherein a mixing ratio of said magnetic powders of said injection-molded magnetic body is set to 80 to 95 percent by mass based on a total amount of said magnetic powders of said injection molded magnetic body and that of said binding resin, wherein said combined body is formed by press-fitting said compressed magnetic body into said housing or bonding said compressed magnetic body thereto, and wherein said compressed magnetic body is disposed inside a space of said housing with said compressed magnetic body in close contact with said injection-molded magnetic body.