Security Element Laser Ablation Reflective Layer
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Solution Overview
Problem
Current security elements lack enhanced manufacturability, counterfeit resistance, and visual appeal, as they rely on traditional methods like embossing and vapor deposition for micro-optical effects, which are not sufficiently robust or versatile.
Innovation Solution
A method involving a structurable layer with a microstructure and a reflector layer applied in a specific pattern, where the reflector layer is printed with a homogeneous thickness and then partially removed using laser ablation to create a second pattern, generating two authenticity features that complement each other and can be viewed from both sides.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional embossing and vapor deposition methods are used to create micro-optical effects, then the manufacturing process is established, but the counterfeit resistance and visual appeal are insufficient
Solution Approach 1:
The patent divides the security element into multiple functional layers: a structurable layer for microstructure creation, a reflective layer for optical effects, and a laser-markable layer for authentication. This segmentation allows each layer to be optimized independently for its specific function, enhancing counterfeit resistance while maintaining manufacturability through specialized processing for each layer type.
Solution Approach 2:
The patent employs composite material structures combining organic structurable layers with inorganic reflective layers, and integrates multiple functional coatings with distinct optical properties. This composite approach creates complex optical effects that are difficult to replicate, thereby improving counterfeit resistance while using well-established manufacturing techniques for each material type.
2Reliability
If a reflective layer is applied over a microstructure, then optical effects are enhanced, but the ability to create multiple authentication features is limited
Solution Approach 1:
The patent applies the reflective layer over the microstructure before any laser marking is performed. This preliminary action ensures that the microstructure is preserved and can serve as a template for subsequent laser-based authentication features, allowing multiple authentication mechanisms to be integrated without compromising the underlying optical structure.
Solution Approach 2:
The patent utilizes the vertical dimension by stacking functional layers (structurable layer, reflective layer, laser-markable layer) to create multiple authentication features. The microstructure in the first layer provides optical effects, while the reflective layer enhances these effects, and the laser-markable layer enables additional authentication through laser writing, thereby increasing authentication features without planar complexity.
3Reliability
If laser ablation is used to create patterns in the reflective layer, then authentication features are enhanced, but the microstructure may be damaged
Solution Approach 1:
The patent applies laser ablation locally to specific regions of the reflective layer to create authentication patterns, while leaving other regions intact to preserve the underlying microstructure. This localized processing ensures that authentication features are enhanced without compromising the integrity of the micro-optical elements that provide the primary optical effects.
Solution Approach 2:
The reflective layer serves as an intermediary between the microstructure and the laser marking process. It protects the delicate microstructure from direct laser exposure while allowing laser patterns to be written on its surface. This intermediary layer enables authentication feature creation through laser ablation without transmitting damaging energy to the underlying microstructure.
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
This approach enhances the security element's authenticity features by creating optically effective microstructured surfaces that are recognizable with the naked eye, providing improved counterfeit resistance and visual appeal through the combination of geometric shapes and holographic images.
Implementation Method 1
the first reflective layer is removed by laser ablation, creating a second pattern, visible when viewed from the front face, within the first reflective layer
Data Source
Figure 1~2b
Figure 3
Figure 4~5
AI summary
A method for manufacturing a security element (10) comprising the following steps: providing a first structurable layer (22); generating a first microstructure (16) in a front face of the first structurable layer (22); and applying a first reflector layer (14) to the first microstructure (16) in a first pattern visible from the front face. In this method, the first reflector layer (14) is applied by printing in the first pattern with a homogeneous thickness (d). In a further step, the first reflector layer (14) is ablated by laser, generating a second pattern visible from the front face in the first reflector layer (14).