Multilayered Document Security Using Luminescent Periodic Raster
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Solution Overview
Problem
Existing multilayered compositions for protecting documents against counterfeiting are inadequate as they fail to provide effective visual verification of authenticity and often use bright, attention-catching colors that can alert potential counterfeiters and interfere with printing processes.
Innovation Solution
A multilayered composition using a periodic raster made from luminescent inks outside the CMYK color range, which changes color gamut, optical density, or saturation when copied, creating a cumulative achromatic effect that mimics conventional four-color printing, and optionally includes additional layers or transparent sections for enhanced security.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If bright luminescent inks are used for protection against counterfeiting, then the protective effect is improved, but the suitability for printing on securities is worsened due to alerting counterfeiters and interfering with printing processes
Solution Approach 1:
The patent applies color changes by using luminescent inks that emit light under UV irradiation, creating a visual effect that is not visible under normal lighting conditions. This resolves the contradiction by providing strong protective effect only when needed (under UV light for verification) while maintaining suitability for printing under normal conditions where the luminescence is not activated, thus not alerting counterfeiters or interfering with standard printing processes.
Solution Approach 2:
The patent extracts the luminescent protective effect as a separate functional layer that can be applied independently from the main document structure. By using a periodic raster pattern with luminescent inks that can be overlaid on top of conventional printed elements, the protective feature is separated from the base document design, allowing standard printing processes to proceed normally while adding security verification capability through the extracted luminescent layer.
2Reliability
If multilayered compositions with luminescent inks are used, then protection against counterfeiting is improved, but visual verification of authenticity is worsened due to bright colors striking the eye
Solution Approach 1:
The patent applies periodic action by using a periodic raster pattern where luminescent and non-luminescent elements are arranged in repeating sequences. This creates a structured visual effect that can be easily verified through systematic observation or copying attempts, improving ease of visual verification while maintaining strong protective effect through the regular pattern that is difficult to reproduce accurately.
Solution Approach 2:
The patent uses color changes to improve visual verification by creating elements that appear different under various lighting conditions. The luminescent inks change from invisible or subtle under normal light to brightly luminescent under UV light, providing a clear visual indicator for authenticity verification. This color transformation makes verification straightforward - users simply need to check for luminescence under appropriate lighting.
3Reliability
If inks with daylight luminescence are used, then the protective effect is improved, but the color coverage is worsened as colors lie outside the CMYK system
Solution Approach 1:
The patent applies local quality by using luminescent inks with colors outside CMYK coverage only in specific localized areas where enhanced protection is needed, such as the periodic raster pattern or specific security elements. The majority of the document can still use conventional CMYK printing for text and standard graphics, maintaining adaptability and versatility for general printing while providing superior protective effect in the luminescent regions.
Solution Approach 2:
The patent uses composite materials by combining luminescent inks with conventional printing materials in a multilayered composition. The luminescent ink layer is applied over or alongside standard CMYK printed elements, creating a composite structure that leverages both the extended color coverage of luminescent materials and the versatility of conventional printing systems. This composite approach allows the document to benefit from colors outside CMYK for security purposes while maintaining compatibility with standard printing workflows for the bulk of the content.
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 composition provides increased protection against counterfeiting by altering the visual perception of documents when copied, making it difficult to reproduce accurately and maintaining a secure appearance under natural light, while being suitable for various secure documents like banknotes and IDs.
Implementation Method 1
the inks comprise luminescent compounds having daytime luminescence in the visible spectrum of light under the natural light
Implementation Method 2
which changes color gamut, optical density, or saturation when copied
Data Source
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AI summary
The invention relates to a multilayered protected composition, in particular to multilayered paper products having special properties which protect securities or valuable documents from counterfeit. The multilayered protected composition is formed with an additional multilayered element, which is formed on the surface of paper and includes a multicolor coating in the form of a periodic raster made by at least two inks of different colors which are contrasted relative to the surface of the paper and lie outside of the range of the color coverage of the CMYK system. The inks comprise luminescent compounds having daytime luminescence in the visible spectrum of light under the natural light. Combinations of inks are such that the cumulative color of the additional protection element is perceived visually as being unsaturated and close to achromatic. The multilayered protection element can form a graphical figure or be part of a figure which changes its visual image by virtue of changing its color gamut, optical density and/or saturation when a document is copied on a printer operating using CMYK color system.