Security Document See-Through Window Registration
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Solution Overview
Problem
Security documents with thermoplastic substrates and transparent windows are vulnerable to tampering, as forgers can easily replace the window with a different image, compromising the authenticity of the personalization information.
Innovation Solution
A 'see-through' security feature is implemented by applying a predetermined image from the front side to the back side of the document within the window, ensuring precise front-to-back registration, making it difficult to counterfeit by requiring exact reproduction of the registered image, which can be verified upon inspection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a transparent window is formed in the security document to display personalization images, then the ease of viewing and verification of personalization information is improved, but the vulnerability to tampering (window replacement) increases
Solution Approach 1:
The patent applies a predetermined security image to the document substrate before the window is installed. This preliminary action creates a security feature that is embedded in the substrate itself, making it impossible for forgers to replace the window without also replacing the embedded security image, thus preventing tampering while maintaining viewing capability
Solution Approach 2:
The patent introduces a predetermined security image as an intermediary element between the window and the document substrate. This security image serves as a mediator that links the window to the authentic document, making it difficult to separate or replace the window without detecting the absence of the corresponding security image
2Reliability
If a predetermined security image is marked onto the document substrate through the window, then the security against fraudulent window replacement is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The patent replaces complex mechanical alignment systems with a laser marking system that can directly mark the security image through the transparent window. This substitution simplifies the manufacturing process by eliminating the need for precise mechanical positioning of multiple components, as the laser can mark the substrate through the window material with sufficient precision
Solution Approach 2:
The patent changes the physical parameters of the marking process by using laser marking through the transparent window rather than traditional contact-based marking methods. This parameter change allows for non-contact marking and reduces the complexity of maintaining precise mechanical alignment during the manufacturing process
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 significantly enhances the security of the document by making it challenging for tamperers to replace the window with a fraudulent image, as the precise registration of the images ensures authenticity verification, thereby protecting the personalization information.
Implementation Method 1
a laser sensitive thermoplastic substrate is marked by applying a laser beam to it which causes it to discolour (i.e. mark)
Implementation Method 2
applying a laser beam to it which causes it to discolour (i.e. mark)
Implementation Method 3
ink jet printing using an ultraviolet (UV) curable ink
Data Source
AI summary
The present invention provides an improved security document having a “see-through” security feature that protects a window of the security document in which personalization information may be displayed, such as an image of the authorized document holder. The “see-through” security feature is provided by front and back side images, such as text (e.g. micro-text or encoded indicia), graphics or other image type, that may be laser marked onto the document substrate from a front side thereof through the window to a back side of the window. At least a part of the front image and at least a part of the back image are in front-to-back registration in window, the registration of the images being subject to verification by suitable inspection of the window. The front and back images may be partial images of a composite image when joined together at a juncture with the front-to-back registration of the partial images located at the juncture so that the images together have an appearance of the composite image in the window. Alternatively, at least a part of the first and second images may be identical with the front-to-back registration of the images located at least one of the identical parts so that the first and second images have an appearance in the window of a single image at those identical parts of the front-to-back registration.