| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a card, which is hard to deform during its portage and, at the same time, develops a few printing ununiformity at printing. <P>SOLUTION: In the card, a first board 5, a second board 6 provided on the rear surface of the first board 5 and a heat sensitive printing layer 3 provided on the front surface of the first board 5 and heated with a thermal head are provided under the condition that the thermal expansion coefficient of the first board 5 is set to be larger than that of the second board 6. The second board 6 is fixed to the first board 5 over its whole rear surface, while the heat sensitive printing layer 3 is arranged partially on the surface of the first board 5. In addition, under the condition being heated to the predetermined temperature with the thermal head, the heat sensitive printing layer 3 develops color in the predetermined printing. <P>COPYRIGHT: (C)2003,JPO |
