DIFFRACTION STRUCTURE HAVING FINE IRREGULAR DIFFRACTION STRUCTURE

摘要

PROBLEM TO BE SOLVED: To provide a diffraction structure which is differed in visibility and glitter from conventional hologram, has high originality, and can be easily authenticated without using an exclusive authenticity determination tool by even a layman.

SOLUTION: In the diffraction structure including a substrate, a diffraction structure-forming layer and a reflection layer, a fine irregular diffraction structure consisting of fine irregularities with an apex interval of 250-400 nm is formed on a surface of the diffraction structure-forming layer, and an irregular structure with an apex interval of 0.01-0.1 mm is further formed on the same surface.

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