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    • 6. 发明授权
    • Recording medium detecting system
    • 记录介质检测系统
    • US07301324B2
    • 2007-11-27
    • US11477566
    • 2006-06-30
    • Shoji YamaguchiYasunori KodaKunihiro TakahashiMario FuseTsukasa Matsuda
    • Shoji YamaguchiYasunori KodaKunihiro TakahashiMario FuseTsukasa Matsuda
    • G01R19/00
    • G11B5/00804
    • A recording medium detecting system includes a magnetic field-generating unit that generates an alternating magnetic field in a predetermined particular region, a detecting unit provided close to the particular region, that detects a change in magnetic flux density not smaller than a predetermined magnetic-flux-density difference B2, and a recording medium, containing multiple magnetic wires made of a magnetic material and formed in a wire shape having a predetermined length, that causes a large Barkhausen effect when the alternating magnetic field is applied. A magnetic-flux-density difference B1 detected by the detecting unit at an installation position thereof when the recording medium is placed in the particular region is not smaller than the magnetic-flux-density difference B2.
    • 记录介质检测系统包括:在预定的特定区域中产生交变磁场的磁场产生单元,靠近特定区域设置的检测单元,其检测不小于预定磁通量的磁通密度变化 密度差B 2,以及包含由磁性材料制成并形成具有预定长度的线状的多个磁线的记录介质,当施加交变磁场时会导致较大的巴克豪森效应。 当记录介质放置在特定区域中时,由检测单元在其安装位置检测到的磁通密度差B 1不小于磁通密度差B 2。