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    Jackpot-resistant magnetic card encoding
    2.
    发明授权
    Jackpot-resistant magnetic card encoding 失效
    防卡磁卡编码

    公开(公告)号：US4562490A

    公开(公告)日：1985-12-31

    申请号：US568383

    申请日：1984-01-05

    申请人： Merlyn Barth ,  Joseph Kosednar

    发明人： Merlyn Barth ,  Joseph Kosednar

    IPC分类号： G06K19/12 ,  G11B20/14 ,  G11B5/09

    CPC分类号： G06K19/12 ,  G11B20/1419

    摘要： A method of magnetic encoding of credit instruments having a strip form magnetic recording medium provides at least one data field on the strip. First and second magnetic field orientations are selected for recordation on the medium of successive, adjacent bit regions in an alternating field orientation pattern with the transition between such orientations defining the transition from one bit region to the next, signalling the initiation of a recorded bit representing either a binary "1" or a binary "0". A first bit region length d.sub.1 for representing one of the binary values "0" and a second bit region length d.sub.2 for representing the other binary value as well as the ratio of d.sub.1 /d.sub.2 are selected, with d.sub.1 /d.sub.2 being from about 0.1 to about 0.5. Thus, the magnetic field transition between adjacent bit regions signals a binary bit and the length of each bit region represents its binary value. Data is recorded in binary format on the medium in one or more data fields using the bit length d.sub.1 and d.sub.2 and ratio d.sub.1 /d.sub.2 so selected. The length of the data fields depends upon the actual value of the data so recorded. The variable data field length assures against jackpotting by unauthorized masking of one of multiple data fields.

    摘要翻译： 具有带状磁记录介质的信用仪器的磁编码方法在条上提供至少一个数据字段。 选择第一和第二磁场取向用于在交替的场定向模式中的连续相邻位区的介质上进行记录，其中这些定向之间的转变定义了从一个位区到下一个位的转变，表示记录位的起始 二进制“1”或二进制“0”。 选择用于表示二进制值“0”中的一个的第一位区域长度d1和用于表示另一个二进制值的第二位区域长度d2以及d1 / d2的比率，其中d1 / d2为约0.1至 约0.5。 因此，相邻位区之间的磁场转变信号是二进制位，每个位区的长度表示其二进制值。 使用比特长度d1和d2以及如此选择的比率d1 / d2，在一个或多个数据字段中的介质上以二进制格式记录数据。 数据字段的长度取决于如此记录的数据的实际值。 可变数据字段长度通过对多个数据字段中的一个进行未经授权的掩蔽来确保针对大点击。

    Vibration-minimizing magnetic card reader
    3.
    发明授权
    Vibration-minimizing magnetic card reader 失效
    振动最小化磁卡阅读器

    公开(公告)号：US4599510A

    公开(公告)日：1986-07-08

    申请号：US568384

    申请日：1984-01-05

    申请人： Merlyn Barth ,  Joseph Kosednar

    发明人： Merlyn Barth ,  Joseph Kosednar

    IPC分类号： G06K13/08 ,  G06K7/08

    CPC分类号： G06K13/08

    摘要： A reader-writer for magnetic cards substantially reduces "jitter" or chattering vibrations which otherwise imperil the accuracy of the read-write functions. The read-write head is itself mounted rigidly for operating while the magnetic card passes along a planar tray surface. A soft rubber anvil roll is mounted directly opposite, for free idling rotation on the same shaft which impels a rubber driving wheel.In contrast with conventional constructions using a spring-mounted head or anvil, the present rigidly mounted head in combination with the free idling soft anvil roll avoids the generation of, and damps out, vibrations, which otherwise might follow from exciting forces such as irregularities in driving friction. The greatly improved accuracy makes feasible the use of debit cards, and has unexpectedly reduced head wear.

    摘要翻译： 用于磁卡的读写器基本上减少了“抖动”或抖动振动，否则这将妨碍读写功能的精度。 读写头本身刚性地安装，用于在磁卡沿平面托盘表面通过时进行操作。 软橡胶砧辊直接相对安装，用于在相同的轴上自由空转，推动橡胶驱动轮。 与使用弹簧安装的头部或砧座的常规结构相比，本发明的刚性安装的头部与自由怠速软砧辊组合避免了产生和消除振动，否则这些振动可能来自诸如不规则的激励力 驱动摩擦。 精度的大大提高使得借记卡成为可能，并且意外地减少了头部磨损。