To obtain a sheet whose pattern is variable depending upon a viewing direction at a low cost by providing a pattern with continuously arranged convex lens-like protrusions on the surface of a transparent sheet and printing a pattern with the same continuous pattern as the front face, staggered with the continuous pattern of the front face, on the rear face of the sheet.
Convex lens-like protrusions 21 are provided in a tortoise shell fashion along an arbitrarily selected continuous pattern axis, and a dot pattern 31 with the same continuous pattern axis as the front face of the synthetic resin sheet 1 is printed axially displaced from the continuous pattern axis of the front face, on the rear face of the sheet 1. The convex lens-like protrusions 21 include a hemispherical one, and the pattern 31 may be a polygonal one corresponding to the protrusions 21 in addition to the dot pattern. The alternative for the tortoise shell fashion arrangement of the protrusions 21 and the pattern 31 may be a triangular, a square or a polygonal formation. As the protrusions 21 gradually become separated from the pattern 31 from a position where these are perfectly laid over each other, the former 21 is remote from the latter 31 and as their separation is further in the progress, the protrusions 21 are overlapped to the adjacent pattern 31.
JP2001254263 | CELLULOSIC FIBER-CONTAINING CLOTH |
SHIMIZU KATSUMI
OTANI TATSURO
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