| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a recording sheet for laser marking with excellent counterfeit- and falsify-proof effect in which an adequate printing can not be performed without information (printing information) related to irradiation energy of a laser light corresponding to printing position of the recording sheet. <P>SOLUTION: A lower recording layer 30, an upper recording layer 20 and a covering layer 10 are successively overlaid on the surface of a sheet base material 40 and is printed. The lower recording layer 30 comprises a black ink layer 31 and a white ink layer 32 forming a printing such as letters and marks when they are exposed to the surface, and they are alternately and in parallel printed on the surface of the sheet base material 40. On the upper recording layer 20, a white ink layer 22 with a little narrower width than that of the black ink layer 31 is overlaid on the black ink layer 31 in such a way that it does not cover the end parts in the width direction of the black ink layer 31, and a black ink layer 21 is overlaid between them and is printed. Printing is performed by the laser light by selectively exposing the black ink layer 21 or the black ink layer 31. <P>COPYRIGHT: (C)2004,JPO |
