SINTERED FERRITE PLATE AND SINTERED FERRITE SHEET

    公开(公告)号:EP3147270A4

    公开(公告)日:2018-01-24

    申请号:EP15796179

    申请日:2015-05-21

    申请人: TODA KOGYO CORP

    IPC分类号: C04B35/30 H05K9/00

    摘要: The present invention relates to a ferrite sintered plate having a composition comprising 47 to 50 mol% of Fe 2 O 3 , 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 x 10 8 to 1 x 10 12 ©cm and a thickness of 10 to 60 µ 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 ( µ 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 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.