Personalizable Security Document with Laser-Safe UV Fluorescence
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Solution Overview
Problem
Existing security documents lack a robust and efficient combination of laser-engraved images and fluorescent inks that provide both visible and UV-responsive features, making them vulnerable to forgery without specialized equipment.
Innovation Solution
A security document design that incorporates a laser-engravable layer with overlapping fluorescent ink layers, allowing a laser-engraved image visible under white light and multi-color fluorescence patterns visible under UV light, with a watermark for additional security, using specific laser parameters to avoid damaging the inks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fluorescent inks are applied to provide security features visible under UV light, then the security document becomes more secure against forgery, but the laser engraving process may damage the fluorescent inks
Solution Approach 1:
The patent divides the security document into distinct layers: a polycarbonate substrate layer and separate fluorescent ink layers. This segmentation allows the laser engraving process to act on the substrate without directly affecting the fluorescent inks, as they are positioned in separate layers that are not in the direct path of the laser beam during engraving.
Solution Approach 2:
The patent transitions from a two-dimensional surface application of fluorescent inks to a three-dimensional layered structure where inks are positioned in separate layers below the substrate surface. This dimensional change allows laser engraving to occur at the substrate level while preserving the fluorescent layers intact, resolving the contradiction between security enhancement and ink integrity.
2Reliability
If multiple fluorescent ink layers with different colors are叠加 to create multi-color fluorescence patterns, then the security feature becomes more complex and harder to forge, but the manufacturing process becomes more complicated
Solution Approach 1:
The patent combines multiple fluorescent ink layers, each containing different fluorescent compounds that emit different colors under UV light. By merging these layers in a stacked configuration, the system achieves multi-color fluorescence security features. The combination is simplified by using a standardized layering process where each layer follows the same structural pattern, reducing overall manufacturing complexity despite the increased security features.
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
Enhances security by ensuring that the laser-engraved image remains intact while providing a multi-color fluorescence effect, making it difficult for forgers to replicate without specialized knowledge of laser parameters, thus increasing the document's authenticity.
Implementation Method 1
a laser-engravable portion configured to have an image laser engraved in the same, the laser engraved image being visible when the substrate is viewed from the first side under white light
Implementation Method 2
the first pattern and the second pattern emitting light of a first color and a second color, respectively, upon irradiation with the UV light
Data Source
AI summary
A personalizable security document (10) includes a security feature (3b) including a combination of a plurality of different features. In particular, the security feature (3b) may include a laser-engraved image in a first layer (16), and one or more fluorescent inks (7a, 7b) in further layers (27a, 27b), which are disposed below the first layer. Optionally, a watermark (8) may also be provided in a lower layer (18). A laser-engraving of the image is performed from a first side (S1) of the substrate (1) such that patterns formed by the inks (7a, 7b) are not affected. Under white light, the laser-engraved image can be viewed from the first side of the substrate, whereas multi-color fluorescence of the patterns can be observed from the second side (S2) under UV light.