Security Document Window with Absorption and Luminescent Elements
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Solution Overview
Problem
Security documents face challenges in maintaining aesthetic appeal while ensuring security features are not easily counterfeitable or falsifiable, particularly due to surface unevenness caused by punching in opaque core layers and inserting transparent window materials, and existing solutions do not provide sufficient opacity in viewing window areas.
Innovation Solution
A security document with a document body formed by laminating interconnected polymer layers, featuring a window area with an absorption element and a luminescent element arranged inside or outside the document body, where the absorption element absorbs electromagnetic radiation to stimulate luminescence, ensuring strong adhesion between polymer layers and allowing for high area coverage without delamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If punching is used to create window areas in opaque core layers, then security features can be displayed, but surface unevenness occurs making the document aesthetically unappealing
Solution Approach 1:
The patent extracts the window area creation from the opaque core layer by using a separate transparent window material layer. This allows the window areas to be defined without punching the core layer, maintaining surface smoothness while enabling security feature display through the transparent window material.
Solution Approach 2:
The document structure is segmented into separate functional layers: an opaque core layer for structural integrity, a transparent window material layer for security feature display, and a protective overlay film. This segmentation allows each layer to perform its function independently without compromising surface smoothness.
2Reliability
If transparent window materials are inserted to create viewing windows, then security features become visible, but the document structure becomes more complex
Solution Approach 1:
The patent merges the window area definition and security feature display functions into a single integrated layer structure. The transparent window material layer combines the viewing window function with the security feature display function, reducing the need for separate complex structural elements.
Solution Approach 2:
The transparent window material layer serves multiple functions simultaneously: it provides the viewing window area, displays security features through luminescent and absorption elements, and maintains surface smoothness. This multi-functionality reduces overall document structure complexity.
3Adaptability or versatility
If existing printing methods are used in window areas, then individualizing features can be applied, but sufficient opacity is not achieved
Solution Approach 1:
The patent uses composite materials in the transparent window material layer, combining transparent polymer base material with luminescent and absorption elements. This composite structure provides both the necessary transparency for window functionality and sufficient opacity control through the luminescent/absorption elements for security feature visibility.
Solution Approach 2:
The patent employs luminescent elements that change optical properties under different lighting conditions. These elements appear opaque or dark under normal lighting to provide window transparency, but emit luminescence under UV or specific lighting to provide security feature visibility, effectively controlling opacity dynamically.
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
The solution provides a secure and aesthetically pleasing security feature that is difficult to counterfeit, with the absorption and luminescent elements creating a complex pattern visible under different lighting conditions, ensuring authenticity verification is effective and delamination is prevented.
Implementation Method 1
an absorption element and a luminescent element arranged inside or outside the document body, wherein the absorption element absorbs electromagnetic radiation to stimulate luminescence
Implementation Method 2
the absorption element absorbs electromagnetic radiation to stimulate luminescence
Data Source
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Figure 2a~2bii
Figure 5~6
AI summary
In order to create a forgery-proof security feature, a security or value document (100) is disclosed which is formed from a document body (150). The document body (150) is produced by laminating at least two polymer layers (120, 130, 140) connected to each other and comprises at least one window region (210, 210', 210"), wherein in the at least one window region (210, 210', 210") there are at least one absorption element (300, 300', 300") and at least one luminescent element (400) overlapping with the at least one absorption element (300, 300', 300"). At least the at least one absorption element (300, 300', 300") is formed using a thermoplastic material.