IMAGE FORMING MATERIAL, AND AUTHENTICITY JUDGMENT DEVICE AND AUTHENTICITY JUDGMENT METHOD

摘要

Disclosed are an image forming material, and an authenticity judgment device and an authenticity judgment method in which an image visually hidden in a printed image appears by overlapping the image with a specific filter or a film, or a printed image changes by angling printed matter integrally formed with a filter or a film, etc. in the field of valuable printed matter such as bank notes, passports, marketable securities, identification cards, credit cards, laissez-passers, etc. which are secured printed matter requiring an anticounterfeit effect. In particular, there is provided an image forming material which forms an image by using a second image formed in a pitch slightly different from a pitch of a first image by using a transparent material or a material of a color different from a color of a material forming the first image at a time of regular reflection, on the first image formed by congregating convex shape printing elements in a predetermined pitch and convex shape pixels by using a material having a color flip-flop characteristic such as a pearl pigment or a liquid crystal material, etc. Further, the printing elements are configured to control a change of movement of a moiré image and a change of a shape by slightly changing each image pixel forming the moiré, and suppress distortion occurring in the moiré image to a minimum and control depth perception of the moiré and speed of the change by adjusting the pitch between the images.