| 摘要 |
A system for forming security markings using structured microdots (154) on a printing plate includes a printhead for forming a first plurality of square spots (156) less than or equal to 11 microns; wherein a first group (157) of the first plurality of square spots is formed in a first pattern (158); and wherein the first pattern is less than or equal to 66 microns and comprises a first microdot. |
