Plastic card provided with magnetic stripe
First Claim
1. A plastic card provided with a magnetic stripe, the plastic card comprising:
- a card substrate comprising polyvinyl chloride; and
a hologram-magnetic stripe formed on said card substrate, said hologram-magnetic stripe comprising a magnetic recording layer and a hologram formed on said magnetic recording layer, said magnetic recording layer comprising first and second magnetic recording layers, said first magnetic recording layer having a coercive force at least twice as high as that of said second magnetic recording layer and a Curie point at least 100°
C. below that of said second magnetic recording layer, such that when said first and second magnetic recording layers are heated at a temperature ranging from said lower Curie point to 30°
C. below said lower Curie point, said first and second magnetic recording layers become substantially identical to each other in saturation writing current value, whereby magnetic information can be written on both said magnetic recording layers simultaneously;
said hologram comprising a hologram forming layer adhered to said magnetic recording layer by an optically transparent continuous film layer, wherein said optically transparent continuous film layer has a refractive index different from that of said hologram forming layer.
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Accused Products
Abstract
A plastic card provided with a magnetic stripe, which is very difficult to forge or alter and, even tough subjected to forgery or alteration, enables the forgery or alteration to be easily detected in appearance. The plastic card includes a card substrate and a hologram-magnetic stripe including, provided on said card substrate in the following order, an adhesive layer, a first magnetic recording layer, a second magnetic recording layer, a transparent continuous thin film layer and a hologram forming layer. The first magnetic recording layer and the second magnetic recording layer are such that one of the magnetic recording layers has a coercive force at least twice as high as the other magnetic layer and a Curie point at least 100° C. below the other magnetic layer and, when the magnetic recording layers are heated at a temperature in the range of from the lower Curie point to 30° C. below the lower Curie point, they become substantially identical to each other in saturation writing current value.
125 Citations
7 Claims
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1. A plastic card provided with a magnetic stripe, the plastic card comprising:
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a card substrate comprising polyvinyl chloride; and a hologram-magnetic stripe formed on said card substrate, said hologram-magnetic stripe comprising a magnetic recording layer and a hologram formed on said magnetic recording layer, said magnetic recording layer comprising first and second magnetic recording layers, said first magnetic recording layer having a coercive force at least twice as high as that of said second magnetic recording layer and a Curie point at least 100°
C. below that of said second magnetic recording layer, such that when said first and second magnetic recording layers are heated at a temperature ranging from said lower Curie point to 30°
C. below said lower Curie point, said first and second magnetic recording layers become substantially identical to each other in saturation writing current value, whereby magnetic information can be written on both said magnetic recording layers simultaneously;said hologram comprising a hologram forming layer adhered to said magnetic recording layer by an optically transparent continuous film layer, wherein said optically transparent continuous film layer has a refractive index different from that of said hologram forming layer. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for recording magnetic information, comprising the steps of:
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providing a plastic card provided with a magnetic stripe, the plastic card comprising a card substrate comprising polyvinyl chloride and a hologram-magnetic stripe formed on said card substrate, the hologram-magnetic stripe comprising a magnetic recording layer and a hologram formed on the magnetic recording layer, said magnetic recording layer comprising first and second magnetic recording layers, the first magnetic recording layer having a coercive force at least twice as high as that of the second magnetic recording layer and a Curie point at least 100°
C. below that of said second magnetic recording layer, such that when said first and second magnetic recording layers and heated at a temperature ranging from said lower Curie point to 30°
C. below said lower Curie point, said first and second magnetic recording layers become substantially identical to each other in saturation writing current value, said hologram comprising a hologram forming layer adhered to said magnetic recording layer by an optically transparent continuous film layer, wherein said optically transparent continuous film layer has a refractive index different from that of said hologram forming layer; andrecording magnetic information on both said magnetic recording layers simultaneously at a temperature ranging from said lower Curie point to 30°
C. below said lower Curie point.
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Specification