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US 6,888,435 B2Granted
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.
Claims3
A magnetic element, comprising:
- a composite magnetic body comprising 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;
- and
- a coil embedded in the composite magnetic body,
- further comprising a soft second magnetic body when the composite magnetic body is defined as a first magnetic body,
- wherein the second magnetic body has a higher magnetic permeability than that of the first magnetic body.
2 more elements
Dependencies are inferred from the claim text.