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    • 5. 发明授权
    • Magnetic recording and playback apparatus of perpendicular recording type
    • 垂直记录类型的磁记录和回放装置
    • US4413297A
    • 1983-11-01
    • US266330
    • 1981-05-22
    • Motoharu TanakaHazime MachidaHiroshi Kobayashi
    • Motoharu TanakaHazime MachidaHiroshi Kobayashi
    • G11B5/02G11B5/127G11B5/30
    • G11B5/02G11B5/1278
    • A magnetic recording and playback apparatus of perpendicular recording type comprises a main pole having a magnetic axis which is normal to a recording surface of a magnetic record medium, an auxiliary magnetic pole disposed in surrounding relationship with the main pole with a small clearance from the lateral side thereof, a coil disposed on part of the auxiliary pole, and a yoke having its one end connected to the auxiliary pole and having its other end of a relatively large area disposed in opposite relationship with the recording surface of the record medium. The free end of the main pole is disposed in contact with the surface of the record medium while the yoke is disposed at a given distance from the surface of the record medium. During a recording operation, a current is passed through the coil in accordance with information to be recorded. Thereupon, a magnetic flux is concentrated in the free end of the main pole to cause an inversion of magnetization in that region of a magnetic layer of the record medium which is contacted by the main pole, thus recording the information. During a playback operation, the free end of the main pole picks up a magnetic flux which depends on the magnetization, representing the information, recorded in the magnetic layer of the record medium, producing a corresponding current flow through the coil. An output current from the coil is utilized for reproduction of the recorded information.
    • 垂直记录类型的磁记录和重放装置包括具有垂直于磁记录介质的记录表面的磁轴的主极,与主极相关联的辅助磁极,与主极具有小的间隙 设置在辅助极的一部分上的线圈以及一端连接到辅助极的轭,其另一端具有与记录介质的记录表面相反的相对较大的区域。 主磁极的自由端设置成与记录介质的表面接触,同时磁轭设置在距离记录介质表面一定距离处。 在记录操作期间,电流根据要记录的信息通过线圈。 于是,磁通量集中在主极的自由端,从而在与主极接触的记录介质的磁性层的该区域中引起磁化反转,从而记录信息。 在重放操作期间,主极的自由端拾取取决于记录在记录介质的磁性层中的表示信息的磁化的磁通量,产生通过线圈的相应的电流。 来自线圈的输出电流用于再现所记录的信息。