Continuous-Line Security Document Personalization With RFID Antenna
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Solution Overview
Problem
Existing security documents lack personalized and visually distinct security features that are difficult to reproduce, and there is a need to enhance the security of such documents by integrating RFID technology with visually perceptible features.
Innovation Solution
A method of personalizing security documents by forming a personalized output image as a two-dimensional pattern of a single continuous line, such as a double spiral, with varying line parameters, which can be laser-engraved or printed to include conductive properties, linking it to an RFID antenna for enhanced security.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional security features are used in security documents, then basic security is provided, but the documents lack personalized and visually distinct features that are difficult to reproduce
Solution Approach 1:
The security document is divided into multiple layers including a polycarbonate substrate layer and a variable data layer, with each layer serving specific security functions. The continuous line pattern is segmented into discrete elements that can be individually controlled during printing to create personalized images while maintaining overall security integrity
Solution Approach 2:
The single continuous line pattern serves multiple functions simultaneously: it creates a visually distinct personalized image, provides a template for RFID antenna integration, and establishes a reproducible security feature. This multi-functional design resolves the contradiction by making the same structural element serve both personalization and security purposes
2Reliability
If laser engraved images are used in polycarbonate substrates, then vital security features are provided, but the documents lack integration with RFID technology for enhanced security
Solution Approach 1:
The patent merges traditional laser-engraved security features in polycarbonate substrates with modern RFID technology by integrating the continuous line pattern into both the visual security element and the RFID antenna structure. This combination creates a unified security system that leverages both optical and electromagnetic verification methods
Solution Approach 2:
The security document uses composite material structures including polycarbonate substrate layers combined with conductive materials for RFID antennas, and variable data layers with specific optical properties. These composite materials enable simultaneous achievement of visual security features and RFID functionality
3Ease of manufacture
If simple printing methods are used for security features, then ease of manufacture is improved, but the visual appearance is not unique and difficult to reproduce
Solution Approach 1:
The printing process controls specific parameters such as line width, spacing, and pattern density to create a continuous line appearance from discrete printed elements. By precisely controlling these parameters, the system produces visually complex and unique patterns that are difficult to reproduce without access to the specific printing parameters and master templates
Data Source
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Figure 3~4
Figure 5~6
AI summary
A method of personalizing a security document includes a formation of a personalized output image (5) by printing a two-dimensional pattern (6) consisting of a single continuous line (8). In this printing, at least one line parameter of each line unit (10) of the single continuous line (8) is varied in accordance with color values of the image units (9) in the personalized input image (4) to create a personalized output image having a unique appearance. If the printed personalized output image (5), in particular, the single continuous line (8) has an electrical conductivity above a given threshold value, the personalized output image (5) may form part of an RFID antenna (18) of the security document (10).