Image display body and image formation method

Abstract

An image display body in which a decorative effect is obtained more effectively by an optical diffraction structure. In an image display body, an optical diffraction structure portion constituted by the optical diffraction structure in a halftone dot state is provided in a colored region on a base material. In the image display body, a dot area percent of a halftone dot a constituting the optical diffraction structure portion to the colored region ranges from 15% to 60%, an area of each halftone dot is smaller than 0.25 mm 2 . The halftone dots are diffused by an error diffusion method.

1 . An image display body in which an optical diffraction structure portion constituted by optical diffraction structure in a halftone dot state is formed on an image on a base material,
 wherein, each of a plurality of halftone dots constituting the optical diffraction structure portion is formed such that each of the halftone dots is enclosed in each of same size square regions a side of which is 400 μm or less, and when each of the halftone dots is enclosed in each of the square regions, the plurality of square regions are arranged at equal intervals in a diagonal direction, and in the diagonal direction a distance between a corner of one of adjacent square regions and a corner of another of the adjacent square regions is 220 μm or less.   
     
     
         2 . The image display body according to  claim 1 , wherein a dot area percent of the optical diffraction structure portion is 40% or less. 
     
     
         3 . The image display body according to  claim 1 , wherein a length of one side of the square region ranges from 100 μm to 200 μm. 
     
     
         4 . The image display body according to  claim 1 , wherein a distance between the adjacent square regions ranges from 50 μm to 150 μm. 
     
     
         5 . An image formation method in which an optical diffraction structure portion constituted by optical diffraction structure is formed in a halftone dot state on a predetermined image by using a transfer sheet where the optical diffraction structure is laminated on a base material sheet thereof,
 wherein each of a plurality of halftone dots constituting the optical diffraction structure portion is formed such that each the plurality of halftone dots is enclosed in each of same size square regions a side of which is 400 μm or less, and when each of the halftone dots is enclosed in each of the square regions, the plurality of square regions are arranged at equal intervals in a diagonal direction, and in the diagonal direction a distance between a corner of one of adjacent square regions and a corner of another of the adjacent square regions is 220 μm or less.