Colored Microstructures in Light Control Films for Security
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Solution Overview
Problem
Current light control films used in security documents suffer from low color saturation when attempting to introduce colored security features using laser inscription, limiting their effectiveness in preventing forgery.
Innovation Solution
A light control film with colored microstructures aligned in a plane, where the microstructures can be partially destroyed or altered by a laser beam to reveal a colored security feature, achieving high color saturation and versatility in design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If laser inscription is used to introduce security features in light control films, then security features can be introduced, but color saturation is low
Solution Approach 1:
The microstructures are pre-colored before the laser inscription process. This preliminary coloring allows the security feature to be introduced while maintaining high color saturation, as the color is already present in the microstructures rather than being added during or after the laser processing.
Solution Approach 2:
The patent changes the physical state and properties of the microstructures by coloring them before laser inscription. This parameter change enables the laser to modify the structure without removing the color, thereby maintaining color saturation while introducing security features.
2Adaptability or versatility
If parts of microstructures are destroyed by laser beam to introduce security features, then security features can be formed, but the original colored appearance is compromised
Solution Approach 1:
The microstructures are colored before laser inscription, so that when parts are destroyed to form security features, the remaining parts retain their color. This preliminary action ensures that the security feature can be introduced without compromising the colored appearance.
Solution Approach 2:
Different parts of the microstructures have different properties - some are colored while others remain transparent or have different colors. This local differentiation allows selective destruction to create security features while preserving the colored appearance in other areas.
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 enables the creation of documents with high color saturation and secure, recognizable security features that are visible only under specific viewing angles, enhancing forgery prevention without requiring additional tools.
Implementation Method 1
parts of the microstructures are destroyed by a laser beam
Data Source
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AI summary
The invention relates to a light control film comprising at least one functional layer (9) which is formed by a plurality of light-controlling microstructures (10) embodied in an extension plane of the functional layer (9) and comprising at least one security feature (52, 53, 54, 55) formed in the light-controlling microstructures (10), wherein the microstructures (10) are oriented perpendicularly to the extension plane of the functional layer (9) or inclined in relation to the direction of extension of the functional layer (9), such that, where there are two adjacent microstructures (10), one of the two microstructures (10) is not completely covered by the other microstructure (10), and wherein a plurality or all of the microstructures (10) is designed such that they are coloured at least in sections and at least one coloured security feature (52, 53, 54, 55) is incorporated.