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US 7,479,862 B2Granted
Ferrite material and ceramic substrate
AssigneeKYOCERA Corporation
InventorsTsutomu Mikura, Kota Ikeda, Koichi Nakahara
Life of this patent
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Abstract
A low-temperature firable ceramic substrate having formed in its inside a ferrite layer with a coil embedded therein is provided. The ferrite layer has a composition of 63 to 73% by mass of Fe2O3, 5 to 10% by mass of CuO, 5 to 12% by mass of NiO, and 10 to 23% by mass of ZnO. Even if firing is performed at a lower temperature than ever, it is possible to obtain a ferrite layer which is excellent in sintered density and magnetic permeability.
Claims14
A ceramic substrate comprising:
- a plurality of ceramic layers formed of a non-magnetic material;
- a ferrite layer formed of ferrite material formed of ferrite containing Fe2O3, CuO, NiO, and ZnO,
- wherein the following formulae are satisfied:
- 63≦a≦73,
- 5≦b≦10,
- 5≦c≦12,
- 10≦d≦23,
- and
- a+b+c+d≦100,
- where a content of Fe2O3 is a % by mass, a content of CuO is b % by mass, a content of NiO is c % by mass, a content of ZnO is d % by mass,
- wherein said ferrite layer is interposed in the plural ceramic layer;
- and
- a coil-shaped conductor layer embedded in the ferrite layer.
10 more elements
Dependencies are inferred from the claim text.