| 摘要 |
PROBLEM TO BE SOLVED: To make it difficult to alter prepaid cards which are used and being used by providing a disconnection line which disconnects a corner part of a prepaid card which is apt to be applied with an external shock according to the use frequency. SOLUTION: The prepaid card 1 with a message rate of 105 is provided with a disconnection line 1a which is disconnected when the card is used up to 70 to 104 in message rate, a disconnection line 1b which is disconnected when the card is used up to 50 to 69 in message rate, and so on 1c, 1d, and 1e in order. The disconnection lines 1a to 1e are provided preferably by minuter rates. Corners 5 other than a disconnection part is preferably made large in roundness or a magnetic part 6 is made complicated in shape by forming a hole 6. It is difficult to alter the prepaid cards having corners cut and even if it is altered, a reproduced can be found mechanically. Further, the shape and magnetic part are devised at the same time to increase alteration preventive effect. |
