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Optically variable element and the use thereof

A variable element, optical technology, applied in optical elements, optics, cards for carrying information, etc., can solve the problems of inability to improve the attractiveness of optical variable elements, high equipment costs, incomplete lighting, etc.

Inactive Publication Date: 2006-02-22
OVD KINEGRAM AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] These three-dimensional effects have hitherto generally been produced by holographic methods, the disadvantage of which is the high equipment outlay involved in producing the masters required for duplication of the corresponding layers
In addition, structures produced by holography suffer from serious optical disadvantages, in particular their light emission is often incomplete.
Furthermore, it is generally not possible to achieve certain color effects to increase the attractiveness of the corresponding optically variable elements

Method used

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  • Optically variable element and the use thereof
  • Optically variable element and the use thereof
  • Optically variable element and the use thereof

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Embodiment Construction

[0040] The highly schematic, relatively rough views in Figures 1a-1c each show a partial region of the inventive optically variable element having a lens-like effect, in which an interface 3 is formed between two layers 1, 2, usually varnish layers, usually An anti-reflection coating (not shown in the figure), eg metallization in the form of an evaporated metal layer, is provided. In this regard, the dimensions of a corresponding lens element in the respective directions are shown on the x-axis of FIGS. 1a-1c, wherein the units in the figures are set arbitrarily, since the exact dimensions or diameters of the lens elements are not important. Generally speaking, the corresponding dimension of the lens element or the free-form element formed by the lens element is 0.15-300 mm, preferably 3-50 mm.

[0041] In each case the thickness or height of the refractive surface or structure respectively formed by the respective layers 1, 2 and interface 3 is given on the Y-axis of FIGS. A...

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Abstract

The invention relates to an optically variable element which at least in surface portions has an interface embedded between two layers and which forms an optically effective structure, that interface having a free-form surface which appears three-dimensionally for a viewer. To emphasise that free-form surface the invention provides that the free-form surface is formed by a partial region of the interface, which is of a lens-like configuration and which produces a magnification, reduction or distortion effect. The invention also provides the use of such optically variable elements as a security element to prevent forgery of value-bearing documents or for articles to be safeguarded, in particular as part of the decorative layer arrangement of a transfer or laminating film.

Description

technical field [0001] The invention relates to an optically variable element. Background technique [0002] The optically variable element according to the invention, at least in the surface portion, has an interface preferably embedded between two layers of the layered assembly and forms a spatially protruding and / or facing away from the (conceptual) reference surface An optically effective structure provided, wherein the optically effective structure has at least one freeform surface, presents to the viewer a numeral, a geometric figure or another object in three-dimensional form. [0003] For example, the above-mentioned can be used as a security element to authenticate or identify valuable documents, such as banknotes, checks, etc., ID cards and passports, credit cards or other objects to be protected. Optically variable elements of this type can also be used for decoration, the boundary between use as a security element and as a decorative element is generally not fix...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B42D15/10
CPCB42D25/328G02B3/08G02B5/1842G02B5/203
Inventor A·斯岭W·R·汤姆普金
Owner OVD KINEGRAM AG