| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide, at a reduced manufacturing cost, a recording sheet which uses no additional materials requiring a high acquisition cost such as a specific ink and a hologram, but utilizes direct thermal printing having high forgery preventing properties. <P>SOLUTION: In order to improve properties of security without using the additional materials such as the special ink and the hologram, recesses are provided in a thermal coloring surface, making use of the recording sheet having a thermal coloring layer. According to this technique, high properties of security can be given to the sheet. In other words, the invention described in claim 1 is the recording sheet 1 that has a thermal recording layer 3 made to color by heating, in a part at least, and has the recesses 5 in a print recording surface. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
