| 摘要 |
<p>PURPOSE:To surely exchange a premium by forming a reversible coloring matter area to be developed by short heating and achromatized by long heating in each premium exchanging card, and after checking and erasing information recorded up to the preceding operation, printing out newly added information. CONSTITUTION:An irreversible visual information recording area and the reversible coloring matter area to be developed by short heating and achromatized by long heating are formed in each premium exchanging card. The reversible coloring matter layer forms a colored image (including characters) by heating of >=300 deg.C for a short period (1 to 10 miliseconds) and the formed image can be achromatized by heating of e.g. 100 to 200 deg.C for >=1sec. When heat energy is applied again to the image part after achromatizing the image, the image can be formed again. Consequently, a compact premium exchanging card reducing the complexity of point calculation and the dangerousness of loss or forgery can be obtained.</p> |
