Three-dimensional plastic sheet

Abstract

The present invention relates to a three-dimensional plastic sheet that forms an array of convex lenses having a plurality of semispherical convex lenses arranged horizontally and vertically on the surface thereof, such that a three-dimensional image can be vividly seen even at every positions irrespective of the position or direction of the plastic sheet, while greatly minimizing the generation of moire patterns caused by the interference of different color dots. The three-dimensional plastic sheet includes: a convex lens layer formed of a transparent synthetic resin and having an array of identical semi-spherical convex lenses formed on the top surface thereof; a transparent plate disposed at the bottom surface of the convex lens layer and formed of a synthetic resin plate having a thickness corresponding to a focal distance of each convex lens; a non-focal distance printed layer disposed on the top surface of the transparent plate by means of offset printing for providing a real picture screen thereon; and a focal distance printed layer disposed on the bottom surface of the transparent plate by means of the offset printing for providing a three-dimensional screen thereon through four-color dot printing computed and image-segmented by a computer graphic process.

Description

technical field [0001] The present invention relates to a three-dimensional plastic sheet capable of mass-produced by offset printing, and more particularly, the present invention relates to a three-dimensional plastic sheet having a series of identical hemispherical convex lenses formed on the top surface , so that regardless of the position or orientation of the plastic sheet, a three-dimensional image can be vividly observed at each position while minimizing the generation of moire patterns due to interference of different color points. Background technique [0002] Typically, a three-dimensional plastic sheet is made from a lenticular screen having a series of semi-cylindrical lenses, each having a pitch of about 0.5 mm, formed on the top surface of the sheet. In the case of 3-D photocopying, the images of objects viewed by the left and right eyes are printed on a lenticular screen, thereby obtaining a 3-D image which, when viewed with both eyes, appears as if the object...

AI Technical Summary

Problems solved by technology

At this time, the problem arises that the conventional plastic sheet does not have high resolution due to the lens relief effect viewed through the lens layer, and thus the printed screen will not be vivid and clear.

[0005] Also, on a general offset printing screen, many dots constituting the printing screen are refracted on the lens layer, so that the interference of the many dots may cause generation of moiré images or blurred vision, thus, a more vivid three-dimensional screen cannot be provided.

[0006] Thus, for traditional three-dimensional plastic sheets processed by offset printing, simple patterns of three-dimensional images should be displayed by monochrome printing, making it difficult to display them through four-primary color printing or special effects in lenticular technology (e.g., two-way transformation, motion, and shape). Effect) to display the 3D effect

[0007] Of course, in some cases, three-dimensional methods using IP (Panoramic Photography) technology such as that proposed by French M.G. Lippmann in 1908 have been provided, however, due to the need for higher high resolution, thus, the above method is not practical to use

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