Optical Lightguide Anti-Tampering for ID Documents
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Solution Overview
Problem
Existing documents of identification lack effective protection for personalized areas, making them vulnerable to tampering and counterfeiting.
Innovation Solution
Incorporating an optical lightguide with a primary incoupler and a primary outcoupler, which forms a protective area overlapping with the personalized area, making it difficult to access or tamper with the personal information without damaging the lightguide.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a security foil with embossing or hologram is used to cover the personalized area, then the protection of personalized information is improved, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent extracts the security function from complex foils and separates it into a dedicated lightguide component. The lightguide is positioned between the personalized area and the observer, creating a protective optical path that simplifies the overall structure while maintaining security. This extraction principle allows the security function to be implemented through a single, well-defined component rather than multiple layered foils.
Solution Approach 2:
The lightguide serves multiple functions simultaneously: it guides light from the incoupler to the outcoupler for display purposes, and it acts as a protective barrier for the personalized information. This multi-functionality reduces the need for separate security foils and simplifies the document structure while maintaining both display quality and security protection.
2Reliability
If the personalized area is covered by security foils, then the security is improved, but the ease of manufacture deteriorates
Solution Approach 1:
The patent merges the security function with the existing lightguide structure used for display purposes. By integrating the anti-tampering capability into the lightguide component that is already part of the document architecture, the manufacturing process is simplified. The lightguide can be produced using standard optical component manufacturing techniques rather than requiring additional foil lamination steps.
Solution Approach 2:
The lightguide acts as an intermediary component between the personalized area and the external environment. It provides a controlled optical path that protects the underlying information while allowing authorized display. This intermediary approach simplifies manufacturing compared to direct foil coverage, as the lightguide can be precisely positioned and integrated into the document structure.
3Measurement precision
If the lightguide protective area overlaps with the personalized area, then the detection of tampering is improved, but the area available for personalized information display is reduced
Solution Approach 1:
The patent applies local quality by positioning the lightguide's protective function specifically where needed - overlapping with the personalized area to provide tampering detection. The lightguide's optical properties are optimized in the overlapping region to ensure accurate tampering detection, while the non-overlapping regions maintain full availability for personalized information display. This localized approach maximizes security effectiveness without unnecessarily reducing display area.
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 lightguide acts as an anti-tampering seal, allowing for detection of any attempts to access the personalized area, thereby enhancing the security and integrity of the identification document.
Implementation Method 1
an optical lightguide (12) comprising a primary incoupler (14) and a primary outcoupler (16), which are structured such that light can be coupled into the lightguide (12) at the primary incoupler (14) and that light guided by the lightguide can be coupled out at the primary outcoupler (16)
Data Source
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Figure 7~8
AI summary
The identification document comprises a personalized area (20) carrying owner-specific information, such as an owner's name data (22a, 22b) or photograph (26), The personalized area (20) is overlapped by a lightguide (12), The lightguide (12) comprises a primary incoupler (14) and a primary outcoupler (16) on opposite sides of the personalized area (20). Any attempt to tamper with the personalized area (20) may lead to a damage in the lightguide (12), which can easily be detected by coupling light into the primary incoupler (14) and testing the light coupled out by the primary outcoupler (16).