Toda Kogyo Corporation

Makoto Sadai

Yoji Okano

Tomohiro Dote

Shingo Honda

Yasuhiko Fujii

Akihiro Yoshida

Mitsunori Kurumada

Kazuyoshi Kawato

Katsumi Nakai

A ferrite sheet strip includes a strip shaped substrate and a plurality of ferrite sheet pieces provided on a surface of the substrate. The plurality of ferrite sheet pieces are aligned and spaced apart by a gap from one another along a longitudinal direction of the substrate. The gap extends at least partially so as not to be parallel to a lateral direction of the substrate.

Ferrite sheet strip, and antenna device and cable using ferrite sheet strip

The present invention relates to a ferrite sintered plate having a composition comprising 47 to 50 mol % of FeO, 7 to 26 mol % of NiO, 13 to 36 mol % of ZnO, 7 to 12 mol % of CuO and 0 to 1.5 mol % of CoO, as calculated in terms of the respective oxides, in which the ferrite sintered plate has a volume resistivity of 1&#xd7;10to 1&#xd7;10&#xb7;cm and a thickness of 10 to 60 &#x3bc;m; and a ferrite sintered sheet comprising the ferrite sintered plate on a surface of which a groove or grooves are formed, and an adhesive layer and/or a protective layer formed on the ferrite sintered plate, in which the ferrite sintered sheet has a magnetic permeability at 500 kHz a real part of which is 120 to 800 and an imaginary part of which is 0 to 30, and a product (&#x3bc;m) of the real part of the magnetic permeability at 500 kHz of the ferrite sintered sheet and a thickness of the ferrite sintered plate is 5000 to 48000. The ferrite sintered plate and the ferrite sintered sheet according to the present invention have a high volume resistivity as well as a large &#x3bc;' value and a small &#x3bc;&#x2033; value of a magnetic permeability thereof, and therefore can be suitably used as a shielding plate in a digitizer system.

Ferrite sintered plate and ferrite sintered sheet

An object or technical task of the present invention is to provide a ferrite sintered sheet having a dense ferrite microfine structure which has a large &#x3bc;' value, a small &#x3bc;&#x2033; value, and a small temperature-dependent change of the &#x3bc;&#x2032; value thereof. The present invention relates to a ferrite ceramics having a composition comprising 47.5 to 49.8 mol % of FeO, 13.5 to 19.5 mol % of NiO, 21 to 27 mol % of ZnO, 7.5 to 12.5 mol % of CuO and 0.2 to 0.8 mol % of CoO, all of the molar amounts being calculated in terms of the respective oxides, the ferrite ceramics further comprising 0.2 to 1.4% by weight of SnOand 0.005 to 0.03% by weight of S and having a density of 5.05 to 5.30 g/cm; and a ferrite sintered sheet comprising the ferrite sintered plate on a surface of which a groove or grooves are formed, and an adhesive layer and/or a protective layer formed on the ferrite sintered plate.

Ferrite ceramics, ferrite sintered plate and ferrite sintered sheet

The present invention relates to an Ni&#x2014;Zn&#x2014;Cu&#x2014;Co ferrite sintered plate having a composition comprising 45 to 50 mol % of FeO, 10 to 25 mol % of NiO, 15 to 36 mol % of ZnO, 2 to 14 mol % of CuO and 0.1 to 3.5 mol % of CoO, all of the molar amounts being calculated in terms of the respective oxides, and a ferrite sintered sheet that is provided on a surface thereof with a groove and further with an adhesive layer and/or a protective layer. The ferrite sintered sheet is capable of exhibiting an increased &#x3bc;' value of a magnetic permeability while maintaining a small &#x3bc;&#x2033; value of the magnetic permeability.

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Otake, Japan

Makoto Sadai