Soshin Electric Co., Ltd.

Ngk Insulators, Inc.

Yukio Isowaki

Hiroyuki Maruta

Tadashi Otagiri

Yuichi Miyata

Tomoyuki Hasegawa

Yui Kumura

It is provided a composite electronic part having magnetic material and dielectric material and made by co-sintering at a temperature of 1000&#xb0; C. or lower. The magnetic material comprises a ferrite comprising 46 to 48 mol % of FeO, 0.1 to 36 mol % of ZnO, 10 to 14 mol % of CuO and the balance being NiO. The dielectric material has a dielectric constant of 1000 or higher, and comprises a barium titanate based dielectric material to which 0.5 to 4.0 weight parts of CuO and 4.0 to 9.0 weight parts of BiOare added with respect to 100 weight parts of the barium titanate based dielectric material.

Composite electronic parts

A ferrite material and an electronic component which employs sintered ferrite formed from the ferrite material. The ferrite material is obtained by adding, as minor ingredients, 0.06-0.50 parts by weight of bismuth oxide in terms of Bi2O3, 0.11-0.90 parts by weight of titanium oxide in terms of TiO2, and 0.06-0.46 parts by weight of barium oxide in terms of BaO to a ferrite powder comprising iron oxide, copper oxide, zinc oxide, and nickel oxide as major ingredients. The weight ratio among the bismuth oxide, the titanium oxide, and the barium oxide is as follows: when the proportion of the bismuth oxide in terms of Bi2O3 is taken as 1.00, then the proportion of the titanium oxide in terms of TiO2 is 1.08-2.72 and that of the barium oxide in terms of BaO is 0.72-1.20.

Ferrite material and electronic component

The magnetic material constituting a magnetic portion is a ferrite mainly containing 31-42 mol % of NiO, 2-10 mol % of ZnO, 43-48 mol % of FeO, 0.5-3 mol % of CoO, and 10-14 mol % of CuO. The dielectric material constituting a dielectric portion is mainly composed of xBaO.yNdO.yBiO.zTiOwherein 0.09&#x2266;x&#x2266;0.25, 0.05&#x2266;y&#x2266;0.20, 0&#x3c;y&#x2266;0.10 and 0.60&#x2266;z&#x2266;0.75. The dielectric material constituting a joint portion is a BaO&#x2014;TiO&#x2014;ZnO dielectric material.

Electronic component including a magnetic layer and a dielectric layer

A sixth coil electrode forming a first coil is electrically connected to a twelfth coil electrode forming a second coil, for example, via a second capacitor electrode in a second capacitor electrode layer. Thus, an induction body has a permeability significantly smaller than the permeability of a magnetic body (for example permeability &#x3bc;=1). Accordingly, it is possible to minimize the permeability to such a degree that it is possible to ignore the connection between the first coil and the second coil appearing equivalently and to obtain a desired frequency characteristic.

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Saku, Japan

Yukio Isowaki