Luminescence Security Feature With Absorptive Spectral Filter
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Solution Overview
Problem
Current security features in valuable and security documents, such as passports and banknotes, lack effective methods for secure personalization and are vulnerable to forgery and copying, with existing technologies limited in producing multi-color representations under various illumination conditions and requiring multiple print heads and complex color management.
Innovation Solution
Incorporating a security feature with a luminescence means and an absorptive spectral filter on a product carrier, where the luminescence means emits radiation that is filtered by the absorptive spectral filter to create a multi-color pattern visible under normal illumination and luminescence conditions, eliminating the need for multiple luminescent colors and simplifying the printing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple luminescent colors are used to create multi-color patterns, then color variety is improved, but device complexity and production cost increase
Solution Approach 1:
The patent introduces an absorptive spectral filter as an intermediary component between the luminescence means and the observer. This filter selectively absorbs certain wavelengths of the luminescence radiation, enabling a single luminescent material to produce multiple colors. For example, a white luminescence means combined with different spectral filters can produce red, green, blue, or other colored patterns, eliminating the need for multiple luminescent materials and simplifying the printing process.
Solution Approach 2:
The patent changes the optical parameters of the system by introducing absorptive filters with specific transmission characteristics. By selecting filters with different absorption spectra, the same luminescence radiation can be transformed into different colors. This parameter-based approach allows flexible color control without changing the fundamental luminescence source, reducing production complexity while maintaining color variety.
2Adaptability or versatility
If multiple print heads are used for different luminescent colors, then multi-color security features are improved, but manufacturing complexity increases
Solution Approach 1:
The patent makes a single print head universal by enabling it to deposit both luminescence means and absorptive spectral filter materials. This multi-functional approach allows one printing system to create all color variations by controlling which materials are deposited where, rather than requiring separate print heads for each color. The same print head can apply white luminescence powder in one pass and colored filter materials in subsequent passes, greatly simplifying manufacturing.
Solution Approach 2:
The patent merges the functions of multiple color deposition systems into a single integrated process. Instead of using separate print heads for red, green, blue, and other luminescent materials, the system combines a single luminescence means with multiple absorptive filter materials that can be applied by the same printing apparatus. This consolidation reduces manufacturing complexity while maintaining the ability to produce multi-color security features.
3Ease of manufacture
If conventional printing methods are used without luminescence, then production simplicity is maintained, but security against forgery decreases
Solution Approach 1:
The patent changes the illumination parameter of the security feature by incorporating luminescence materials that respond to UV or other non-visible excitation sources. While the printing process remains simple and conventional, the printed features exhibit luminescence under specific illumination conditions, creating a security property that is not visible under normal lighting. This parameter change from visible-only to luminescence-capable provides enhanced anti-forgery protection without complicating production.
Solution Approach 2:
The patent introduces luminescence materials as an intermediary layer between the printed pattern and the observer under specific lighting conditions. These materials can be applied using conventional printing methods, but they provide an additional security dimension by emitting light when exposed to UV or other excitation sources. The absorptive spectral filters work as intermediaries to control the color of this luminescence, creating verifiable security features that maintain production simplicity while significantly enhancing anti-forgery 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
This solution allows for the secure reproduction of multi-color, monochromatic, or grayscale patterns under both conventional and luminescence illumination, enhancing document security and reducing production complexity while maintaining color consistency and natural appearance.
Implementation Method 1
at least one luminescence means and additionally at least one absorptive spectral filter means for luminescence radiation emitted by the at least one luminescence means
Implementation Method 2
absorptive spectral filter means for luminescence radiation emitted by the at least one luminescence means
Data Source
AI summary
An easily producible security feature according to the invention contains at least one luminescence device on and/or in a product carrier. Additionally, the security feature contains, in and/or on the product carrier, at least one absorptive spectral filter for luminescence radiation exiting from the at least one luminescence device, such that a color impression results both under illumination with visible radiation and under luminescence illumination conditions.