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    Offset read/write magnetic recording system with guard band
    2.
    发明授权
    Offset read/write magnetic recording system with guard band 失效
    带保护带的偏移读/写磁记录系统

    公开(公告)号：US3860958A

    公开(公告)日：1975-01-14

    申请号：US33639173

    申请日：1973-02-27

    Applicant: IBM

    Inventor： HANSON CHARLES C

    IPC: G11B5/02 ,  G11B5/09 ,  G11B5/55 ,  G11B15/12 ,  G11B5/46

    CPC classification number: G11B15/12 ,  G11B5/02 ,  G11B5/5547

    Abstract: A magnetic read/write head having a single gap is mounted to a carriage positionable to locate the head at selected tracks on a magnetic disk by means of a lead screw and stepping motor. The pitch of the lead screw requires a multiple number of steps to move the read/write head one track position. Control circuitry is provided whereby the read/write head is either in the read or the write mode. A write operation is performed by first switching into the read mode and moving the head to the desired track. The stepping motor is then operated to offset the head to the right of the desired track. The sector identification is read with the head in the offset position and immediately after reading the identification, the operation is switched into the write mode to perform a D.C. erase of the sector. Upon reaching the end of the sector, the operation switches to the read mode and during the remainder of the revolution, the stepping motor offsets the head to the left of the desired track. The erased sector is then relocated by reading the identification for that sector and the operation again switches into the write mode and the desired data is written into the sector over the previously recorded data, if any, with a write current, i.e., using non-return to zero recording, which upon recording the new data destroys the old data. The head is then returned to the nominal position, i.e., not offset, and the operation switches into the read mode so as to read the written data and verify that the data has been properly written.

    Abstract translation: 具有单个间隙的磁读/写头安装到可定位的托架上，借助于导螺杆和步进马达将磁头定位在磁盘上选定轨道上。 导螺杆的间距需要多个步骤来将读/写头移动一个轨道位置。 提供控制电路，由此读/写头处于读或写模式。 通过首先切换到读取模式并将头移动到期望的轨道来执行写入操作。 然后操作步进电机以将头部偏移到所需轨道的右侧。 在头部偏移位置读取扇区识别，并且在读取识别之后立即读取写入模式以执行扇区的直流擦除。 在到达扇区的末端时，操作切换到读取模式，并且在转动的其余部分期间，步进电机将头部偏移到所需轨道的左侧。 然后，擦除的扇区通过读取该扇区的标识而重新定位，并且操作再次切换到写入模式，并且将期望的数据写入先前记录的数据中的扇区（如果有的话），写入电流，即， 返回到零记录，在记录新的数据时会破坏旧的数据。 然后，头部返回到标称位置，即不偏移，并且操作切换到读取模式，以便读取写入的数据并验证数据已被正确写入。

    Magnet driver circuit
    4.
    发明授权
    Magnet driver circuit 失效
    磁铁驱动电路

    公开(公告)号：US3573562A

    公开(公告)日：1971-04-06

    申请号：US3573562D

    申请日：1967-09-08

    Applicant: IBM

    Inventor： HANSON CHARLES C ,  MARING BLAYNE E

    IPC: G06K1/02 ,  H01F7/18 ,  H01H47/32

    CPC classification number: H01F7/1877 ,  G06K1/02

    Abstract: An emitter controls the setting and resetting of a latch. The amplified set output of the latch turns on a current switch. The current switch conditions the anodes of silicon controlled rectifiers. The silicon controlled rectifiers are selectively turned on through logic circuitry. The magnets are connected in the anode circuit of the silicon controlled rectifiers. The magnets are deenergized by tuning the silicon controlled rectifiers off. This is done by reverse biasing the silicon controlled rectifiers, anode to cathode, by turning the current switch off. When the current switch is turned OFF, current continues to flow through the silicon controlled rectifiers for a short time. A back e.m.f. is generated when the current in the magnet coil is decreasing. This back e.m.f. is used to turn on a transistor referenced to a particular negative potential. This transistor then provides base current for another transistor which provides a path for collapsing the fields of the magnet coils.

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