| 摘要 |
<p>PURPOSE:To uniformly frost the surface of a card so as to repeatedly produce and erase visible recorded image on the prepaid card or the like. CONSTITUTION:In order to retain strain by frosting synthetic resin smooth layer 11, which is produced on the surface of a card 1, frosting is performed by pressing frosted film 5 against the surface of the card with a thermal head 3. As a result, unevenness-free or uniform frost is obtained. Since the obtained frost retains strain, by heating, the heated portion only is returned to smooth or transparent, resulting in allowing to form visible image.</p> |
