Patent ID: 7974006

Claim:
A stereoscopic sheet structure comprising: a convex lens assembly comprising a plurality of convex lenses provided on one surface of a first sheet member and disposed at predetermined first arrangement intervals and in predetermined first arrangement directions, wherein the convex lenses focus light on a focal plane; and a repeating design portion which comprises a plurality of design units which are arranged on the focal plane of the convex lenses at second arrangement intervals and in second arrangement directions which are different from the first arrangement intervals and/or the first arrangement directions of the convex lenses, and which comprises a first continuously deformed design portion in which the second arrangement intervals of the design units change regularly, such that when any three adjacent design units are selected, a ratio (D N˜N+1 /D N+1˜N+2 ) of an interval D N˜N+1 between a N th design unit N and a N+1 th design unit N+1 adjacent thereto to an interval D N+1˜N+2 between the N+1 th design unit N+1 and a N+2 th design unit N+2 adjacent thereto falls within a range from 0.95 to 1.05, and the second arrangement directions of the design units change regularly such that an intersection angle that is formed between an extended line of a straight line connecting the N th design unit N and the N+1 th design unit N+1 adjacent thereto and a straight line connecting the N+1 th design unit N+1 and the N+2 th design unit N+2 adjacent thereto falls within a range of −1 degree to +1 degree.