Document Security Markings Using Enhanced Moiré Patterns
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Solution Overview
Problem
Existing security marks in document printing require special equipment for decoding and can be costly, and marks visible only under specific lighting conditions may not be practical for all recipients.
Innovation Solution
A method of printing a pattern mark using multiple sets of parallel lines with varying frequencies and angles, combined with different colors, to create an enhanced moiré effect that is visible without additional equipment, and optionally incorporating fluorescent or correlation marks for added security.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If correlation marks or other security marks requiring decoding equipment are used, then document security is improved, but device complexity and cost increase for the recipient
Solution Approach 1:
The patent extracts the decoding function from separate equipment and embeds it directly into the document through the moiré pattern itself. The security verification is performed by the human visual system or simple camera, eliminating the need for specialized decoding devices while maintaining security through the complex multi-layer pattern construction
Solution Approach 2:
The document security mark performs its own verification function through the moiré effect, which can be observed directly by humans or captured by standard cameras. The pattern self-encodes the security information through its geometric structure, eliminating the need for external decoding systems
2Reliability
If fluorescent marks or infrared marks are used, then document security is improved, but ease of operation deteriorates as specific lighting conditions or devices are required
Solution Approach 1:
The moiré pattern security mark serves multiple functions: it provides security verification visible under normal lighting conditions, can be captured by standard cameras, and maintains effectiveness across different viewing environments. The pattern works universally without requiring specific lighting conditions or specialized viewing devices
3Reliability
If multiple inks and line widths are used to create enhanced moiré effect, then visual security is improved, but manufacturing complexity increases
Solution Approach 1:
The security mark is segmented into distinct functional layers: background moiré patterns providing visual security, foreground text carrying information, and optional fluorescent/correlation marks for additional verification. Each layer can be processed independently through the printing system, allowing modular manufacturing
Solution Approach 2:
The patent utilizes variations in line width as a key parameter to create the enhanced moiré effect. By changing the width parameter of printed lines while maintaining the same physical printing process, complex visual security patterns are generated without requiring fundamentally different manufacturing capabilities
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 enhanced moiré effect provides visible security without specialized decoding tools, while fluorescent and correlation marks enhance document security by revealing hidden information under specific lighting conditions.
Implementation Method 1
The enhanced moiré pattern provides visible security without specialized decoding tools
Implementation Method 2
fluorescent marks, which are printed characters that are only visible under black light or other ultraviolet light
Data Source
AI summary
A substrate includes a mark that is an enhanced moiré pattern. In some embodiments, the mark includes multiple sets of parallel bars printed at various angles and in certain color combinations. Each of the bars includes multiple lines printed at various colors. The overall mark will cause the substrate to exhibit an enhanced moiré effect.