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    Single reel magnetic tape unit
    4.
    发明授权
    Single reel magnetic tape unit 失效
    单卷磁带单元

    公开(公告)号：US3666202A

    公开(公告)日：1972-05-30

    申请号：US3666202D

    申请日：1970-08-13

    Applicant: IBM

    Inventor： WENNER JOHN W

    IPC: G11B15/18 ,  G11B23/06 ,  G11B23/07 ,  G11B23/107 ,  G11B15/32 ,  G11B15/58 ,  G11B23/10

    CPC classification number: G11B15/1883 ,  G11B23/06 ,  G11B23/07 ,  G11B23/107

    Abstract: A standard 9-track, half-inch, 300-foot mini-reel of magnetic tape, having a relatively large endless polyethylene belt loosely encircling the tape, is inserted into a cartridge have a U-shaped vacuum column portion. The side walls of the vacuum column converge as they extend away from the reel, and an opening is formed in the back surface of the vacuum column. The reel mounts on a vacuum activated reel latch to accurately position the reel and loosely position the cartridge adjacent to reference plate. When the reel is so positioned, the open back of the vacuum column is held against the reference plate by the vacuum opening in the reference plate. A vacuum source both actuates the reel latch, to couple the tape reel to a reversible drive motor, and pulls the endless belt into the vacuum column. Forward rotation of the motor causes a fundamental band of magnetic tape, of increasing layer thickness, to be established in the vacuum column, the inner surface of the endless belt establishing the outer layer of the fundamental band. A magnetic transducer is mounted on the reference plate in a position to contact with the inner layer of the fundamental band. A spring provides a light contact force to oppose the frictional force between the cartridge, and the reference plate and to cause slight rotation of the cartridge about the reel axis when a rewind mode is initiated, to allow high speed rewind with the tape out of contact with the transducer.

    Abstract translation: 具有宽松环绕带的相对较大的环形聚乙烯带的标准9轨，半英寸，300英尺的磁带微型盘被插入到具有U形真空柱部分的盒中。 真空塔的侧壁在离开卷轴的同时会聚，在真空塔的后表面形成开口。 卷轴安装在真空启动的卷轴闩上，以准确地定位卷轴并松动地将盒放置在与参考板相邻的位置。 当卷轴定位时，真空塔的开启背部通过参考板中的真空开口保持在参考板上。 真空源都致动卷轴闩锁，以将磁带卷盘耦合到可逆驱动马达，并将环形带拉入真空塔。 马达的正转使得在真空塔中建立了增加层厚的磁带的基带，环形带的内表面建立了基带的外层。 磁传感器安装在参考板上与基带内层接触的位置。 弹簧提供轻微的接触力以抵抗盒和参考板之间的摩擦力，并且当启动倒带模式时使盒围绕卷轴轴线轻微旋转，以允许高速倒带与带不接触 与传感器。

    Magnetic read/write head with partial gap and method of making
    5.
    发明授权
    Magnetic read/write head with partial gap and method of making 失效
    具有局部差距的磁性读/写头和制作方法

    公开(公告)号：US3621153A

    公开(公告)日：1971-11-16

    申请号：US3621153D

    申请日：1969-12-22

    Applicant: IBM

    Inventor： WENNER JOHN W

    IPC: G11B5/127 ,  G11B5/147 ,  G11B5/23 ,  G11B5/29 ,  G11B5/28 ,  G11B5/24 ,  G11B5/42

    CPC classification number: G11B5/29 ,  G11B5/1272 ,  G11B5/23 ,  Y10T29/49004 ,  Y10T29/49036 ,  Y10T29/49048

    Abstract: A magnetic head having a plurality of read/write tracks, each track being formed of a single continuous lamina of highpermeability magnetic material which is wrapped around the edge of a support substrate and extends through an opening in the substrate. A coil encircles one leg of each of the lamina, the coils being alternately placed on opposite sides of the substrate to allow minimum space between the tracks. A magnetic gap extends less than the complete distance across each individual lamina parallel to the edge of the substrate. The electrical characteristics of each individual magnetic gap are monitored as the gap is cut. The cutting operation is terminated in accordance with the value of an electrical characteristic to obtain uniform gap characteristics for each of the gaps. The lateral position of the cut is adjusted in accordance with the value of an electrical characteristic to obtain longitudinal alignment of all of the gaps.

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