| 摘要 |
<p>PURPOSE:To make information recorded on a thermal recording layer invisible, prevent forgery and interpolation by an iniquitous reading, and improve the thermal recording layer in light resistance. CONSTITUTION:On a substrate 2, a thermal recording layer 3, an ultraviolet light absorbing layer 4, and a hiding layer 5 transmitting an infrared light for making said thermal recording layer 3 invisible are successively laminated. When information is recorded on the thermal recording layer 3 by color forming in the form of a pattern, such as a bar code, characters, and numerals, a colored part (pattern forming part) absorbs an infrared light, and an uncolored part (pattern unforming part) reflects an infrared light at a high ratio. The pattern can be read by the difference in contrast. A visible light to the thermal recording layer 3 is interrupted by the hiding layer 5, whereby the information on the thermal recording layer 3 is prevented from being visually read. An ultraviolet light is interrupted by the ultraviolet light absorbing layer 4, whereby the deterioration of the thermal recording layer 3 is also prevented.</p> |
