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The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.

The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.

Patent No.:

US 10714247 B1

PDFFull Text
Date of Patent:
Jul. 14, 2020

Filed:

May. 21, 2015

Ferrite sintered plate and ferrite sintered sheet

Applicant:

Toda Kogyo Corp., Hiroshima-shi, Hiroshima-ken, JP;

Inventors:

Yoji Okano, Otake, JP;

Makoto Sadai, Otake, JP;

Shingo Honda, Otake, JP;

Mitsunori Kurumada, Otake, JP;

Akihiro Yoshida, Otake, JP;

Kazuyoshi Kawato, Otake, JP;

Assignee:

TODA KOGYO CORP., Hiroshima, JP;

Attorney:

Nixon & Vanderhye P.C.

Primary Examiner:

Megha M Gaitonde

Int. Cl.
CPC ...
H05K 9/00 (2006.01); H01F 1/34 (2006.01); C04B 35/26 (2006.01);
U.S. Cl.
CPC ...
H01F 1/342 (2013.01); C04B 35/2666 (2013.01); H05K 9/00 (2013.01); H05K 9/0075 (2013.01); C04B 2235/3274 (2013.01); C04B 2235/3275 (2013.01); C04B 2235/3279 (2013.01); C04B 2235/3282 (2013.01); C04B 2235/3284 (2013.01); C04B 2235/96 (2013.01);
Abstract

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 1×10to 1×10·cm and a thickness of 10 to 60 μm; 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 (μm) 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 μ' value and a small μ″ value of a magnetic permeability thereof, and therefore can be suitably used as a shielding plate in a digitizer system.

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