Depiction Arrangement for Security Documents
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Solution Overview
Problem
Current security features for data carriers, such as banknotes and identification documents, are vulnerable to counterfeiting and lack effective high-security measures that cannot be reproduced with top-quality copiers, particularly in terms of optically variable elements and moiré magnification arrangements.
Innovation Solution
A depiction arrangement that splits a target image into multiple partial target images, using a motif image subdivided into periodically arranged cells with microinformation regions, where the information-bearing image patterns are below the human eye's resolution limit, allowing for a hidden security feature that can be detected with a microscope, and can be combined with other security features like diffractive patterns and holograms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional security features like holograms and diffraction patterns are used, then visual security is improved, but vulnerability to counterfeiting increases
Solution Approach 1:
The target image is divided into multiple partial target images arranged in a periodic pattern. Each partial image contains only a portion of the complete information, making it useless for counterfeiting purposes. The complete image can only be reconstructed when all partial images are viewed together in the correct configuration.
Solution Approach 2:
A viewing grid consisting of microlenses is introduced as an intermediary element. This viewing grid acts as a mediator that, when placed over the motif image, optically reconstructs the complete target image from the scattered partial images. Without this specific intermediary, the security feature appears as meaningless patterns.
2Illumination intensity
If the complete target image is displayed directly, then visual clarity is improved, but security against copying is worsened
Solution Approach 1:
The complete target image is segmented into multiple partial target images that are distributed across the motif image in a periodic arrangement. Each segment contains insufficient information to reveal the complete picture, preventing effective copying while maintaining visual appeal.
Solution Approach 2:
The security feature operates in two dimensions: at normal viewing distance, the periodic pattern provides visual interest, but when a viewing grid is applied, a third dimension of information revelation occurs, reconstructing the complete image. This dimensional transformation prevents copying at the first level.
3Reliability
If microinformation regions below human resolution limit are used, then security is improved, but detection capability without magnification is worsened
Solution Approach 1:
Multiple microinformation regions containing below-resolution details are merged into a periodic pattern that creates a visible macroscopic motif image. The individual micro-elements remain undetectable to the naked eye, but their collective arrangement forms an aesthetically pleasing pattern that guides the viewer to apply the viewing grid for full revelation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Significantly enhances counterfeit security without affecting the visual appearance of the target image, providing a non-visible code that can be verified with magnification, and allows for multiple hidden codes within the same visual representation.
Implementation Method 1
a viewing grid, composed of a plurality of viewing grid elements, that, when the motif image is viewed, reconstructs the complete target image from the mapped regions arranged in the cells
Implementation Method 2
The fundamental operating principle of such moiré magnification arrangements is described in the article 'The moiré magnifier,' M. C. Hutley, R. Hunt, R. F. Stevens and P. Savander, Pure Appl. Opt. 3 (1994), pp. 133-142
Data Source
AI summary
The invention relates to a depiction arrangement for security papers, value documents, electronic display devices or other data carriers, having a grid image arrangement for depicting a target image (40) that is broken down into two or more partial target images (42, 44), havinga motif image that is subdivided into a plurality of periodically or at least locally periodically arranged cells (24) in each of which are arranged mapped regions of one or more of the partial target images (42, 44),a viewing grid (22), composed of a plurality of viewing grid elements, that, when the motif image is viewed, reconstructs the complete target image (40) from the mapped regions arranged in the cells (24),the motif image being, independently of the cell subdivision, split into at least first and second microinformation regions (60, 62) in which the cells each include different combinations of mapped regions of the partial target images (40, 42), and the microinformation regions (60, 62) being arranged in the shape of specified image motifs that exhibit information-bearing image patterns whose dimensions are below the resolution limit of the human eye.