Patent ID: 6846599

Claim:
An image structure, comprising: a medium; and an image formed on the medium; wherein the image is formed so that an angular distribution of surface reflection light beams under a condition that a surface of the image is irradiated with a slit-transmitted light beam satisfies the following three characteristics: (1) an angle A corresponding to a half value of a reflected light peak is not smaller than unity but not larger than twice as large as an angle A 0 corresponding to a half value of a reflected light peak of surface reflection light beams under a condition that a surface of a gloss standard glass plate (Gloss 96.8, made by MURAKAMI COLOR RESEARCH LABORATORY) is irradiated with a slit-transmitted light beam; (2) ΔX G WS/ΔX G WS 0 is not larger than 10 when ΔX G WS is an integrated value (WS of center-of-gravity fluctuation) after the X coordinate X G of the center of gravity in each Y position is calculated in an X-Y coordinate system having an X axis in a direction corresponding to a width of a slit and a Y axis in a direction corresponding to a length of the slit and is multiplied by a frequency response function of vision on the basis of frequency analysis of a locus of the X coordinate X G of the center of gravity in the Y direction, and ΔX G WS 0 is a reference value obtained by calculation of WS of center-of-gravity fluctuation of the gloss standard glass plate (Gloss 96.8, made by MURAKAMI COLOR RESEARCH LABORATORY) in the same manner as described above; and (3) an angle B at which a quantity of reflected light becomes {fraction (1/10)} as large as the peak value is in a range of from 3×A 0 to 6×A 0 , both inclusively.