公开(公告)号：US10714247B2

公开(公告)日：2020-07-14

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: H05K9/00 ,  H01F1/34 ,  C04B35/26

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：US10128029B2

公开(公告)日：2018-11-13

申请号：US15032711

申请日：2014-10-30

Applicant: TODA KOGYO CORP.

Inventor： Yoji Okano ,  Tomohiro Dote ,  Makoto Sadai ,  Shingo Honda ,  Katsumi Nakai ,  Yasuhiko Fujii

IPC: H01F1/10 ,  H01F1/34 ,  C04B35/26 ,  B32B3/30 ,  B32B18/00 ,  C04B35/626 ,  C04B35/638 ,  H01Q1/24 ,  H01Q1/38

Abstract: 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 μ′ value, a small μ″ value, and a small temperature-dependent change of the μ′ value thereof. The present invention relates to a ferrite ceramics having a composition comprising 47.5 to 49.8 mol % of Fe2O3, 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 SnO2 and 0.005 to 0.03% by weight of S and having a density of 5.05 to 5.30 g/cm3; 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.