Patent ID: 10302956

Abstract:
A stereoscopic sheet having a variable perspective viewing angle and a thin-layered stereoscopic sheet having a three-dimensional decorative effect. The portions of the sheet, viewed three-dimensionally, create dynamic changes according to the perspective distance. The stereoscopic sheet includes convex lenses arrayed on the top surface of the stereoscopic sheet to intersect at regular intervals. A printed layer is formed at the focal distance of the convex lenses. The focal distance of the convex lenses is formed to be approximately 3.5 times longer than the pitch. A repetition gap of a printed pattern formed on a portion of a printed area is determined as a pattern gap to allow the impression of depth or protrusion to be sensed at a short-sighted distance. The repetition gap of the printed pattern is less than a parallax gap at a minimum proximity distance within the short-sighted distance by approximately 80%-98%.