Smart Card Variable Translucent Edge Security
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Solution Overview
Problem
Security documents with transparent edges suffer from significant printable area loss and inadequate counterfeiting resistance, while fully opaque cards are prone to delamination attempts by fraudsters.
Innovation Solution
A security document with a frame of variable appearance that is non-transparent under normal observation but becomes translucent when viewed against a light source, allowing full surface printing and integration of security patterns, including a thin translucent layer made of polycarbonate or other thermoplastic materials within a multilayer complex.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If transparent edges are used to detect delamination attempts, then counterfeiting resistance is improved, but printable area is reduced
Solution Approach 1:
The patent applies local quality by making only the edge portions of the card transparent while keeping the central area opaque. This allows the edges to serve as delamination indicators while preserving the central area for full printable surface, thus resolving the contradiction between counterfeiting resistance and printable area.
2Area of stationary object
If fully opaque cards are used to maximize printable area, then graphic personalization is improved, but delamination detection is worsened
Solution Approach 1:
The patent implements local quality by differentiating the optical properties of different card regions: edges are made transparent for delamination detection while the central area remains opaque for printing, thus resolving the contradiction between printable area and delamination detection capability.
3Reliability
If transparent frame is added to detect manipulation, then security is improved, but device complexity is increased
Solution Approach 1:
The patent merges the frame structure with the card body by making the edge portions of the card itself transparent rather than adding a separate transparent frame. This integration reduces device complexity while maintaining the security function of detecting delamination attempts.
Solution Approach 2:
The patent makes the card edges multi-functional by using them both as structural boundaries and as security indicators. The transparent edges serve dual purposes: defining the card perimeter and indicating delamination attempts, thus reducing the need for separate security features and lowering overall device complexity.
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 enhanced resistance to counterfeiting by maintaining the entire surface for graphic personalization and printing while creating a visual break, offering multiple security levels and making delamination attempts more visible, thus increasing the card's resistance to fraudulent manipulation.
Implementation Method 1
a layer (5) of variable appearance, which has an opaque appearance when the observer looks at it from the point of view of a light source, and it has a translucent appearance when the observer looks at it opposite a light source
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
The invention relates to a security document, comprising a multilayer complex (30, 30', 30", 30"') having an opaque area surrounded by transparent frame (4). The invention is characterized in that it further comprises a layer (5) having a variable appearance, i.e. opaque when the observer is on the same side as the incident light falling on said layer, but translucent (5) when said layer is arranged between the observer and a light source, and in that said layer (5) having a variable appearance extends beyond the opaque area of the multilayer complex and into the area of the transparent frame (4), such as to create a visible effect of a translucent-frame surrounding said opaque area.