Decision set and decision sheet, latent image sheet and visualization sheet

摘要

PPROBLEM TO BE SOLVED: To enhance decorativeness of a determination technique in which a visualization pattern is superimposed on a latent image pattern having a latent image so that the latent image is visualized. PSOLUTION: A latent image sheet has a latent image pattern comprising a latent image composed of a periodic pattern and a background composed of a periodic pattern that is different from the latent image in phase, pitch or array direction. The visualization sheet has a visualization pattern composed of a periodic pattern. By superimposing these latent image sheet and the visualization sheet on each other, the latent image is visualized in the determination technique. Of the latent image pattern and the visualization pattern, at least one of them is constituted of an optical reflection film 3 which is installed along a minute rugged surface having an optical diffraction function. PCOPYRIGHT: (C)2011,JPO&INPIT