MAGNETICALLY CODED CARD STRUCTURE
First Claim
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1. In combination:
- an opaque card formed of a center layer of nonmagnetic material between two layers of opaque, non-magnetic material, said center layer having a plurality of spaced openings therethrough;
respective permanent magnets in said openings, said magnets being of the same thickness as said center layer, said magnets being resilient elements frictionally and resiliently engaging the walls of the openings in which they are located, each magnet being so poled that its opposite surfaces are of opposite polarities, whereby said magnets are poled along lines perpendicular to the opposite surfaces of said center layer, the polarities of some of the magnets at each surface of said center layer being north poles and the remainder being south poles, said north and south poles at each surface of said center layer being in a predetermined pattern, the field of each magnet outside the card surfaces being sufficiently strong to operate a respective magnet responsive device when the card is placed in a stationary position adjacent the device, and said magnets being characterized in that the polarities thereof at the card faces are not alterable or erasable by an opposite magnet pole brought or moved adjacent thereto.
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Abstract
A monolithic card is formed of three plastic sheets bonded together, wherein the center sheet has a plurality of holes, each filled with a magnetic disc adapted to be axially poled. The center sheet is punched at one station, then located at a second station beneath a flexible card of magnetic material, and with its holes aligned with respective punches which simultaneously punch discs from the card and force them into holes. The center and outer sheets are stacked, and bonded under heat and pressure. The discs are magnetized with polarities at one card face distributed in a desired pattern.
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Citations
2 Claims
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1. In combination:
- an opaque card formed of a center layer of nonmagnetic material between two layers of opaque, non-magnetic material, said center layer having a plurality of spaced openings therethrough;
respective permanent magnets in said openings, said magnets being of the same thickness as said center layer, said magnets being resilient elements frictionally and resiliently engaging the walls of the openings in which they are located, each magnet being so poled that its opposite surfaces are of opposite polarities, whereby said magnets are poled along lines perpendicular to the opposite surfaces of said center layer, the polarities of some of the magnets at each surface of said center layer being north poles and the remainder being south poles, said north and south poles at each surface of said center layer being in a predetermined pattern, the field of each magnet outside the card surfaces being sufficiently strong to operate a respective magnet responsive device when the card is placed in a stationary position adjacent the device, and said magnets being characterized in that the polarities thereof at the card faces are not alterable or erasable by an opposite magnet pole brought or moved adjacent thereto.
- an opaque card formed of a center layer of nonmagnetic material between two layers of opaque, non-magnetic material, said center layer having a plurality of spaced openings therethrough;
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2. The combination of claim 1, wherein said openings are circular and said magnets are disc magnets.
Specification