Security Document Lenticular Grid for Tamper-Resistant Verification
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Solution Overview
Problem
Existing security documents face challenges in decentralized personalization and protection against tampering, as information stored on the surface is vulnerable to manipulation, and central storage methods require high technical effort and authentication verification.
Innovation Solution
The solution involves storing information using at least two types of picture elements in a grid structure, where corresponding grid positions are laterally offset, and a lenticular grid is formed on the back of the document to ensure that only specific types of pixels are visible from preferred detection directions, making it difficult to forge or falsify the document.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If information is stored on the surface of the document, then decentralized personalization is enabled, but the information becomes vulnerable to manipulation
Solution Approach 1:
The patent embeds the first image element grid within the document body and places a lenticular lens grid on the rear side that optically overlays with it. This nesting creates a hierarchical structure where the lens grid protects and reveals the embedded image elements, preventing unauthorized manipulation while enabling decentralized personalization through surface-level information storage.
Solution Approach 2:
The patent uses a lenticular lens grid formed as a thin film or layer on the rear side of the document. This thin film structure provides protective functionality while maintaining document flexibility and enabling the optical filtering effect that ensures only authorized image elements are visible from specific viewing angles.
2Reliability
If a lenticular lens grid is added to filter image elements, then security against forgery is improved, but device complexity increases
Solution Approach 1:
The patent replaces complex mechanical verification systems with an optical filtering mechanism using a lenticular lens grid. Instead of requiring mechanical authentication devices, the system uses optical properties of lenses to automatically filter and reveal only authorized image elements, simplifying the verification process while maintaining high security standards.
Solution Approach 2:
The patent changes the optical parameters of the document by introducing a lenticular lens grid with specific focal lengths and arrangements. This parameter change enables the document to display different image elements based on viewing angle and position, providing security functionality without adding complex mechanical or electronic components.
3Reliability
If multiple image element grids are used for color information, then information security is enhanced, but manufacturing precision requirements increase
Solution Approach 1:
The patent incorporates the first image element grid within the document body during the document manufacturing process, before the final assembly is completed. This preliminary action ensures that the grid is precisely positioned and integrated into the document structure, reducing the precision requirements for subsequent assembly steps while maintaining high information security.
Solution Approach 2:
The patent uses asymmetric arrangements of multiple image element grids with different optical properties and orientations. This asymmetry ensures that even if one grid is compromised, the overall security is maintained, and it helps reduce the precision requirements by creating unique optical signatures that are difficult to replicate without exact knowledge of the asymmetric configuration.
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
This approach enhances the security of the document by making it nearly impossible to manipulate or counterfeit, as any changes in the image elements would be conspicuous during verification, and ensures that only authentic information is visible from the intended detection directions.
Implementation Method 1
a lenticular lens grid is formed on the rear side of the document body, wherein the image element grids and the lenticular lens grid are designed and arranged relative to one another in such a way that, with respect to the rear side, at least two preferred viewing directions exist for optical detection, under which only the image elements of one type can be detected through the lenticular lens
Data Source
Figure 1~4
Figure 2a~2b
Figure 5
AI summary
The invention relates to a security document (1), a method for the production thereof, and a verification method. A security document (1) is proposed, comprising a document body (2) having a front side (9) and an opposite rear side (10), wherein the document body (2) is transparent for transmitted light observation at least in a window area (3), and wherein graphical information (4) that can be perceived in reflected light observation of the front side (9) is stored on or in the document body (2) in the window area (3), wherein the graphical information (4) is formed by means of at least two different types of image elements (5, 6), wherein an image element grid (15, 16) having grid locations is associated with each of the at least two different types of image elements (5, 6) and the image elements (5, 6) of a type are arranged only at grid locations (25, 26) of the image element grid (15, 16) associated with the type, and wherein the image element grids (15, 16) have grid locations (25', 26') corresponding to each other, which are arranged adjacent to each other in the document body (2), wherein a lens grid (50) is formed on the rear side (10) of the document body (2) and wherein the image element grids (15, 16) are designed and arranged in relation to each other and to the lens grid (50) in such a way that there are at least two preferred detection directions (65, 66) in regard to the rear side (10) of the document body (2), in each of which preferred detection directions only the image elements of one type (5, 6) of the graphical information (4) can be detected through the lens grid (50) at a time.