Optically variable security element

Abstract

The invention relates to an optically variable security element (12) for protecting valuable objects, said element comprising a substrate (28) with opposing first and second main surfaces and an optically variable structure (20) which is arranged on the first main surface and which has an embossed structure (22) and a coating (24). According to the invention: the coating (24) comprises at least one line pattern (30) and a background layer (26) that contrasts with the line pattern (30); the embossed structure (22) comprises a two-dimensional pattern of raised and / or recessed embossed elements (34); the coating (24) and the embossed structure (22) are combined such that at least one line segment (36) of a line (32) in the line pattern (30) lies substantially on each embossed element (34); and at least one of the parameters 'position of the line segment on the embossed element', 'orientation of the line segment on the embossed element' and 'form of the line segment' varies locally over the extent of the optically variable structure (20), such that when the security element (12) is tilted, the line pattern (30) creates the effect of motion, in particular a pumping or rotational effect.

Description

technical field [0001] The present invention relates to an optically variable security element for securing a valuable object, comprising a substrate having opposing first and second major surfaces, and arranged on the first major surface, comprising an embossed pattern and Optically variable patterns of coatings. The invention also relates to a method for producing such a security element, and to a data carrier having such a security element. Background technique [0002] For protection purposes, data carriers such as documents of value or certificates, or other valuables, such as well-known goods, often have security elements which allow verification of the authenticity of the data carrier and at the same time serve as a means of protection against illegal copying . [0003] Security elements with viewing angle-dependent effects play a special role in security since they cannot be reproduced even with the most modern reproduction devices. In this case, the security elem...

AI Technical Summary

Problems solved by technology

Since in the security element not only a grid of miniature images has to be produced, but also perfectly aligned grids of microlenses, concave mirrors or aperture masks, this micro-optical patterning is critical to the manufacturing process. The workmanship is very demanding and cannot be used economically for all types of valuables, or cannot be combined with other security features

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