Non-alterable magnetic coding
First Claim
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1. A card for carrying a machine readable magnetic code, comprising:
- a non-magnetic substrate; and
an interrupted strip of nonpermanently magnetizable material affixed to said substrate, said strip being several times thinner than said substrate, said strip having a column of parallel rifts, none of said substrate being in said rifts, said rifts and said magnetizable material between each of said rifts being arranged in a pattern bearing a predetermined relationship to said code, said magnetizable material between each of said rifts being magnetized in the same direction.
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Abstract
A card having an uninterrupted strip of magnetizable material affixed to the surface of a substrate can carry a machine readable code in the form of a magnetized pattern. By removing alternate magnetized segments, in a column of parallel rifts across the strip, the machines readable code becomes non-alterable, since a uniform, unidirectional magnetization of the remaining material restores the original code.
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Citations
44 Claims
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1. A card for carrying a machine readable magnetic code, comprising:
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a non-magnetic substrate; and an interrupted strip of nonpermanently magnetizable material affixed to said substrate, said strip being several times thinner than said substrate, said strip having a column of parallel rifts, none of said substrate being in said rifts, said rifts and said magnetizable material between each of said rifts being arranged in a pattern bearing a predetermined relationship to said code, said magnetizable material between each of said rifts being magnetized in the same direction. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A method of encoding a magnetizable strip affixed to a card, comprising the step of:
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affixing to said card said magnetizable strip at a thickness several times less than said card; forming a plurality of parallel rifts along the length of said strip, the rifts containing neither material from said card nor magnetizable material; and nonpermanently magnetizing in the same direction the uninterrupted intervals between successive ones of said rifts. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33)
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34. Apparatus for forming encoding rifts onto a magnetizable strip affixed to a card, comprising:
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a cutting means for cutting transverse rifts in said strip; translation means for relatively moving said card longitudinally with respect to said cutting means; control means coupled to said cutting means for directing it to cut said rifts according to a predetermined pattern; and
magnetic means for magnetizing the interval between said rifts in the same direction. - View Dependent Claims (35, 36, 37, 38, 39, 40)
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41. A card reader for reading magnetizable intervals between rifts on a magnetizable strip comprising:
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a frame for guiding said card longitudinally; a magnetic sensor mounted on said frame and positioned for sensing said magnetizable intervals and producing a pulse in response to the passage of each; a magnetizing means mounted on said frame and positioned alongside said sensor for magnetizing said magnetized intervals, whereby the magnetized intervals are refreshed; and state means for disabling said magnetizing means, said state means being operable to disable said magnetizing means if said magnetizable strip does not have rifts. - View Dependent Claims (42, 43)
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44. A method for refreshing and reading the magnetizable intervals between rifts on a magnetizable strip comprising the steps of:
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determining if said strip has rifts; applying, if said strip has rifts, a magnetizing unidirectional magnetic field to said magnetizable intervals between said rifts; and sensing the magnetization and size of said magnetizable intervals.
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Specification