Embossed Security Document with Laser-Engraved Moiré Protection
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Solution Overview
Problem
Existing security documents lack sufficient mechanisms to prevent tampering and forgery, particularly when laser-engraved images are used, as they can be difficult to replicate and enhance security features.
Innovation Solution
A personalizable security document is designed with a laser-engravable material embedded in the substrate that changes color upon laser irradiation, combined with an embossed pattern on the surface, which alters appearance at different angles, and optionally includes a watermark and moiré pattern to enhance security.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a laser-engraved image is provided in a polycarbonate substrate, then security against tampering is improved, but the document becomes more susceptible to forgery due to replicability issues
Solution Approach 1:
The patent combines multiple security features (laser-engraved image, embossed pattern, fluorescent ink patterns, moiré pattern) into a single integrated security document. The laser-engraved image is embedded within the polycarbonate substrate while an embossed pattern is formed on the outer surface, and fluorescent ink patterns are incorporated in additional layers. This merging of multiple features creates a composite security system that is significantly more difficult to replicate than individual features alone.
Solution Approach 2:
The patent uses a composite structure consisting of a polycarbonate substrate containing laser-engraved material, additional layers with fluorescent ink patterns, and an embossed pattern on the outer surface. This composite material approach integrates different materials and structures (polycarbonate, fluorescent inks, embossed patterns) to create a security feature that leverages the unique properties of each component, making forgery more difficult.
2Reliability
If multiple security features are combined in a security document, then security is enhanced, but the device complexity increases
Solution Approach 1:
The patent divides the security document into distinct functional segments: a polycarbonate substrate containing an embedded laser-engraved image, additional layers with fluorescent ink patterns, and an embossed pattern on the outer surface. Each segment serves a specific security function and can be independently manufactured and verified. This segmentation allows for modular manufacturing and simplifies the production process despite the overall complexity of the combined 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
The combination of laser-engravable material and embossed pattern, along with a watermark and moiré effect, significantly increases the document's security by making it difficult to forge, as the combined effects must be replicated accurately, and the moiré pattern obscures the image upon angle change, detecting potential fraud.
Implementation Method 1
a laser-engravable material configured to have a personalized image laser engraved in the same. The laser-engravable material exhibits a color-change effect upon irradiation with laser light.
Implementation Method 2
the embossed pattern includes a regular pattern adapted to form a moiré pattern in combination with a further regular pattern, laser-engraving a personalized image in the laser-engravable material
Data Source
AI summary
A personalizable security document including a combination of two secure features, namely, a laser-engravable material embedded in a substrate of the security document and an embossed pattern formed in an outer surface of the substrate and overlapping the laser-engravable material. The combination of the laser-engravable material and the embossed pattern may result in a change in appearance of the embossed pattern when the security document is viewed at different observation angles. Security can be further enhanced by providing a watermark below the laser-engravable material. Further, by providing appropriate structures in the embossed pattern and the laser-engravable material, a personalized security document exhibiting a moiré effect can be obtained.