| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a two-dimensional code forming method by laser marking forming a two-dimensional code without bright-dark reversal, and also to provide a laser marking device thereof. <P>SOLUTION: A decision is made whether a marking portion formed on a material has a bright pattern or a dark pattern. On the basis of the decision result, when the marking portion of a work W of the material has a bright pattern, a code symbol of the two-dimensional code of an original image is bright-dark reversed to create a reversed code symbol 1R. Thereby, a laser marker 10 is controlled so as not to irradiate a cell of the code portion with a laser beam, but to irradiate the cell of a background portion with the laser beam. When the marking portion is a normal material of a dark pattern, the laser marker 10 is controlled so as not to irradiate the cell of the background portion with the laser beam, but to irradiate the cell of the code portion with the laser beam. <P>COPYRIGHT: (C)2006,JPO&NCIPI</p> |
