Personalizable Security Document With Laser-Hologram Tamper Resistance
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Solution Overview
Problem
Existing security documents lack effective methods to enhance the security and integrity of personalized images, making them vulnerable to tampering and forgery.
Innovation Solution
A personalizable security document is designed with a laser-engravable material embedded in the substrate that exhibits a color-change effect upon laser irradiation, combined with a hologram overlapping the laser-engravable material, and optionally a watermark, to create a complex and difficult-to-replicate visual effect.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a laser-engraved image is provided in a polycarbonate substrate, then the security and integrity of the document is improved, but the document becomes more vulnerable to tampering and forgery
Solution Approach 1:
The patent combines a laser-engraved image with a holographic element and fluorescent ink patterns in a single security feature. The laser-engraved image is formed in a first layer, the hologram is provided in a second layer, and fluorescent ink patterns are added in a third layer, creating a multi-layered security feature that is difficult to replicate or tamper with.
Solution Approach 2:
The security feature uses a composite structure combining polycarbonate substrate, laser-engraved material, holographic element, and fluorescent ink. This composite approach integrates multiple security technologies into a single feature, making the document more secure against tampering and forgery.
2Reliability
If multiple security features are combined in layers, then the security against tampering is improved, but the complexity of the document structure increases
Solution Approach 1:
The security feature is divided into distinct layers: a first layer containing the laser-engraved image, a second layer containing the hologram, and a third layer containing the fluorescent ink patterns. This segmentation allows each layer to be optimized for its specific security function while maintaining overall integration.
3Ease of manufacture
If laser engraving is performed from one side of the substrate, then the manufacturing process is simplified, but the ability to observe certain features from different sides is limited
Solution Approach 1:
The patent adds a temporal dimension to the viewing experience by incorporating fluorescent ink patterns that are invisible under normal light but become visible under UV illumination. This allows the same security feature to provide different visual information depending on the illumination condition, enhancing versatility without complicating the manufacturing process.
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 a laser-engravable material and hologram enhances the security of the document by making it harder to forge, while the watermark provides additional verification under transmission, ensuring the integrity of personalized images.
Implementation Method 1
The laser-engravable material includes at least one type of pigments exhibiting a color-change effect upon irradiation with laser light
Implementation Method 2
The security feature further includes a hologram provided towards the first side from the laser-engravable material. The hologram overlaps the laser-engravable material at least in part and is visible when the substrate is viewed from the first side under white light
Implementation Method 3
one or more fluorescent inks are provided in further layers of the same. Under white light, the laser-engraved image can be viewed from the first side, whereas a multi-color fluorescence of the patterns can be observed from a second side under UV light
Data Source
AI summary
A personalizable security document includes a combination of two secure features, namely, a laser-engravable material, and a hologram overlapping the laser-engravable material. The metallic properties of the laser-engravable material result in an enhancement of the holographic effect obtained from the hologram. Additionally, the hologram may extend to other portions of the security document in a continuous manner, for example, as a full-page hologram. This may connect the secondary image formed in the laser-engravable material with other features provided in different portions of the security document to further increase the security.