| 摘要 |
<p>PURPOSE: To make it possible to produce different diffraction grating patterns in superposition on each other or these diffraction gratings and hologram images in superposition on the same substrate by specifying the treatment of the overlapped parts of dot arrangement. CONSTITUTION: The one dot shape of the overlapped parts is actually patterned to an intrinsic shape and the other dot shape to a shape lacking the overlapping parts in the case the dot arrangement of the desired pattern is superposed. If, for example, the two-dimensional images 1 by raster data and the function curves 2 by vector data are superposed on each other, the dots constituting the function curves 2 are formed to the intrinsic shape and the dots constituting the two-dimensional images are formed to the shape lacking the overlapping parts by giving priority to the function curves 2 over the two-dimensional images 1 in order to stress the function curves 2. The dot relations are formed to such shapes that the one is a perfect shape and the other is a sacrificial shape as shown by a partially enlarged Fig. The diffraction grating patterns which are intricate, are highly accurate and have a high effect of preventing forgery are obtd.</p> |
