Toda Kogyo Corporation

Mitsunori Kurumada

Yoji Okano

Makoto Sadai

Shingo Honda

Akihiro Yoshida

Kazuyoshi Kawato

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.

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Otake, Japan

Mitsunori Kurumada