Security Document Fluorescent Gradient Validity Indicator
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Solution Overview
Problem
Security documents face challenges in visually verifying the validity period due to error-prone manual checks of alphanumeric codes and ease of counterfeiting, particularly with date components and alphanumeric codes being difficult to authenticate.
Innovation Solution
A security document featuring a visible area with a gradient of two fluorescent colors applied along a marked direction, where the concentration ratio changes over time, producing a shifting color impression that indicates the document's validity period, along with a device for excitation and comparison to determine if the validity has expired.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If alphanumeric codes or bar codes are printed to indicate validity period, then the document can store validity information, but the visual check becomes error-prone and susceptible to counterfeiting
Solution Approach 1:
The patent applies fluorescent colors with different lifetimes that change over time, creating a visible color gradient that shifts position as the document ages. This allows validators to easily check validity by observing the color distribution and comparing it against reference values, eliminating errors associated with reading alphanumeric codes while maintaining simplicity.
Solution Approach 2:
The patent uses fluorescent dyes with different degradation rates (different lifetimes) as the fundamental parameter change mechanism. As time passes, the concentrations of these dyes change at different rates, causing a measurable shift in the color gradient position. This physical-chemical parameter change provides a reliable, hard-to-counterfeit validity indicator that is easy to verify visually or with simple equipment.
2Loss of information
If manual checking of date components is used, then validity information can be displayed, but the checking process becomes complex and error-prone
Solution Approach 1:
The patent extracts the validity verification task from complex manual date component analysis and transforms it into a simple visual observation of color gradient position. By encoding the validity period information in the spatial distribution of fluorescent colors rather than in readable text, the system eliminates the need for manual interpretation of multiple date components, reducing both errors and procedural complexity.
Solution Approach 2:
The patent creates a visual copy of validity information in the form of a color gradient that can be directly observed and compared. Instead of requiring users to read and interpret alphanumeric date codes, the system provides a visual representation (color distribution) that naturally encodes the validity status, making verification simpler and more accurate.
3Reliability
If fluorescent colors with different lifetimes are applied with concentration gradients, then a shifting color impression indicates validity period, but the document production becomes more complex
Solution Approach 1:
The patent merges multiple security features (fluorescent dyes, concentration gradients, aging mechanisms) into a single integrated validity indicator system. By combining these elements during the document production process, the system creates a validity feature that is inherently difficult to counterfeit while using standard document manufacturing techniques, thus maintaining ease of production despite the enhanced security.
Solution Approach 2:
The patent performs preliminary encoding of validity information during document production by applying fluorescent dyes with specific concentration gradients. This preliminary action embeds the validity timeline into the document's physical structure, so that no additional components or complex assembly steps are needed later—the validity indicator is already in place and will naturally evolve over time according to the predetermined dye lifetimes.
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 provides a visually distinct and difficult-to-falsify method for determining the validity period, enhancing security and ease of verification by utilizing the shifting color impression, making it harder to counterfeit and simplifying the validation process.
Implementation Method 1
Fluorescent colors can be used as luminescent substances, for example, which include pigments that can be excited in an optically excited state and emit electromagnetic radiation in the infrared, visible or ultraviolet spectral range when de-excited
Data Source
Figure 1~4
Figure 5~7b
Figure 8a~8b
AI summary
The invention relates to a security document, a method for the production and a device for checking the validity of the security document, wherein at least two different colors are applied to the security document at least in one region (7) that is visible from a lateral surface, said colors exhibiting different concentration gradients (1,2) along a marked direction (3) in said region (7), wherein the at least two different colors are fluorescent colors, wherein the concentration gradients (1, 2) are selected such that when exciting the fluorescence, an area (9) of a marked color is perceivable and the at least two colors have different life spans, wherein the concentration gradients (1, 2) and the dimensions of the region (7) along the marked direction (3) are selected such that after production with a predetermined validity duration, a perceivable shift of the area (9) of the marked color impression takes place.