| 摘要 |
PURPOSE:To prevent completely the forgery of a magnetic card, by having 3-fold difference of reluctance force between a magnetic layer of a low reluctance force and a magnetic layer of a high reluctance force and desabling a forger to erase the card proper information recorded to the magnetic layer of a high reluctance force. CONSTITUTION:A magnetic transfer tape is formed by laminating an exfoliating layer 10, a magnetic layer 2 of a low reluctance force, a magnetic layer 3 of a high reluctance force and an adhesive layer 11 successively on a supporter 9. This transfe tape is adhered close to a card basic material 5 via the layer 11 and then heated with pressure for transfer. Then a supporter 9 is separated from the lamination layer, and this lamination layer is buried into the material 5 with heat and pressure down to the same level as the surface of the material 5. In this case, the supporter 9 uses a polyester film, etc. of 25mu thickness; the layer 10 uses polyester resin, etc. of 1-3mu thickness; and the material 5 uses the polyvinyl chloride resin, etc. respectively. Then a >=3-fold difference of reluctance force is secured between the layers 2 and 3. As a result, it is impossible to erase the card proper information recorded to the layer 3. |
