OPTICAL SECURITY MARKING COMPONENT, METHOD OF MANUFACTURING SUCH A COMPONENT, SYSTEM COMPRISING SUCH A COMPONENT, AND READER FOR CHECKING SUCH A COMPONENT

摘要

THE PRESENT INVENTION RELATES TO AN OPTICAL SECURITY MARKING COMPONENT PRODUCING A FIRST VISIBLE CONFIGURATION WHEN OBSERVED THROUGH A POLARIZER ORIENTED IN A FIRST ORIENTATION, AND A SECOND CONFIGURATION, SEPARATE FROM THE FIRST, VISIBLE WHEN OBSERVED THROUGH THE POLARIZER ORIENTED IN A SECOND ORIENTATION, THE OPTICAL COMPONENT COMPRISING A STAMPED FILM (22) FOR FORMING AT LEAST TWO DIFFRACTION GRATINGS HAVING DIFFERENT ORIENTATIONS, CHARACTERIZED IN THAT EACH OF SAID GRATINGS HAS A PERIOD OF LESS THAN 550 NM AND A MODULATION BETWEEN 0.25 AND 0.5 RELATIVE TO A REFERENCE PLANE.