| 摘要 |
PURPOSE:To prevent the output attenuation due to the contact between magnetic layers to use a magnetic card in an ordinary card reader, by constructing the magnetic layer with two layers, an upper layer having a high coercive force and a lower layer having a low coercive force. CONSTITUTION:The upper part of a magnetic layer 2 provided on a magnetic card base material 1 is made into a layer 3 having a high coercive force of 500-3,000 oersted, and the lower part is made into a layer 4 having a low coercive force of 200-450 oersted. |
