公开(公告)号：US20170117075A1

公开(公告)日：2017-04-27

申请号：US15312288

申请日：2015-05-21

Applicant: TODA KOGYO CORP.

Inventor： Yoji OKANO ,  Makoto SADAI ,  Shingo HONDA ,  Mitsunori KURUMADA ,  Akihiro YOSHIDA ,  Kazuyoshi KAWATO

IPC: H01F1/34 ,  C04B35/26 ,  H05K9/00

Abstract: The present invention relates to a ferrite sintered plate having a composition comprising 47 to 50 mol % of Fe2O3, 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 1×108 to 1×1012·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.

公开(公告)号：US20180199474A1

公开(公告)日：2018-07-12

申请号：US15743794

申请日：2016-07-11

Applicant: TODA KOGYO CORP.

Inventor： Yoji OKANO ,  Akihiro YOSHIDA ,  Kazumi YAMAMOTO ,  Yuji OMOTE

IPC: H05K9/00 ,  H01F1/36 ,  H01F1/34

CPC classification number: H05K9/0088 ,  B32B7/02 ,  B32B2307/212 ,  H01F1/344 ,  H01F1/36

Abstract: In accordance with the present invention, there is provided a noise suppression sheet that is capable of absorbing noise at a wide frequency range of from 10 MHz to 1 GHz. The present invention relates to a ferrite laminate formed by laminating a conductive layer comprising a conductive filler and a resin and a magnetic layer comprising ferrite; the conductive layer has a surface electrical resistance of of 100 to 5000 Ω/□; the ferrite is partitioned into small parts; and a real part of a magnetic permeability of the ferrite as measured at 10 MHz is 130 to 480, and an imaginary part of of the magnetic permeability of the ferrite as measured at 10 MHz is 30 to 440.