Composite magnetic body, and magnetic element and method of manufacturing the same
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsOsamu Inoue, Junichi Kato, Nobuya Matsutani, Hiroshi Fujii, Takeshi Takahashi
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Abstract
The present invention provides a composite magnetic body containing metallic magnetic powder and thermosetting resin and having a packing ratio of the metallic magnetic powder of 65 vol % to 90 vol % and an electrical resistivity of at least 104 Ω·cm. When a coil is embedded in this composite magnetic body, a miniature magnetic element can be obtained that has a high inductance value and is excellent in DC bias characteristics.
Claims29
A composite magnetic body, comprising:
- metallic magnetic powder;
- thermosetting resin and
- an electrical insulating material other than the thermosetting resin,
- wherein the composite magnetic body has a packing ratio of the metallic magnetic powder of 65 vol % to 90 vol % and an electrical resistivity of at least 104 Ω·cm, and wherein the electrical insulating material contains at least one compound selected from an organic silicon compound, an organic titanium compound, and a silica-based compound.
A magnetic element, comprising:
- a composite magnetic body comprising metallic magnetic powder, thermosetting resin, and an electrical insulating material other than the thermosetting resin, the composite magnetic body having a packing ratio of the metallic magnetic powder of 65 vol % to 90 vol % and an electrical resistivity of at least 104 Ω·cm;
- and
- a coil embedded in the composite magnetic body,
- wherein the electrical insulating material is formed in accordance with at least one of the following arrangements (a)-(d):
- (a) the electrical insulating material contains at least one compound selected from an organic silicon compound, an organic titanium compound, and a silica-based compound;
- (b) the electrical insulating material is a solid powder with a mean particle size not exceeding one tenth of that of the metallic magnetic powder:
- (c) the electrical insulating material is plate- or needle-like particles;
- and
- (d) the electrical insulating material is at least one selected from fatty acid salt, fluororesin, talc, and boron nitride.
A composite magnetic body, comprising:
- metallic magnetic powder;
- thermosetting resin, and
- an electrical insulating material other than the thermosetting resin,
- wherein the composite magnetic body has a packing ratio of the metallic magnetic powder of 65 vol % to 90 vol % and an electrical resistivity of at least 104 Ω·cm, and the electrical insulating material is a solid powder with a mean particle size not exceeding one tenth of that of the metallic magnetic powder.
A composite magnetic body, comprising:
- metallic magnetic powder;
- thermosetting resin, and
- an electrical insulating material other than the thermosetting resin,
- wherein the composite magnetic body has a packing ratio of the metallic magnetic powder of 65 vol % to 90 vol % and an electrical resistivity of at least 104 Ω·cm, and the electrical insulating material is plate- or needle-like particles.
A composite magnetic body, comprising:
- metallic magnetic powder;
- thermosetting resin, and
- an electrical insulating material other than the thermosetting resin,
- wherein the composite magnetic body has a packing ratio of the metallic magnetic powder of 65 vol % to 90 vol % and an electrical resistivity of at least 104 Ω·cm, and the electrical insulating material is at least one selected from fatty acid salt, fluororesin, talc, and boron nitride.
Dependencies are inferred from the claim text.