Optically Variable Security Element: Tilt-Dependent Patterned Motifs
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Solution Overview
Problem
Existing optically variable security elements lack sufficient security against counterfeiting and visual attractiveness, particularly those with multiple appearances or effects in different colors.
Innovation Solution
The alignment of directional microreflectors in a security element creates two or more distinct motifs, one visible as a rasterized motif within a tilt angle range and another visible outside the raster area, with microreflectors at different heights and orientations to enhance visual effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple microreflector arrangements with different tilt angle ranges are combined, then security against counterfeiting is enhanced and visual attractiveness is improved, but device complexity increases
Solution Approach 1:
The security element is divided into multiple discrete microreflector arrangements, each responsible for a specific tilt angle range and displaying a particular motif or color. This segmentation allows each arrangement to be optimized independently for its specific function while collectively providing enhanced security through multiple viewable features across different tilt angles.
Solution Approach 2:
The patent introduces the dimension of tilt angle range as a key differentiator between microreflector arrangements. By organizing microreflectors according to their operational tilt angle ranges rather than spatial position alone, the system creates a multi-dimensional structure where each arrangement operates in a distinct angular dimension, enabling multiple security features to coexist without spatial interference.
2Ease of manufacture
If microreflectors are arranged to create multiple distinct motifs, then visual attractiveness and recognition speed are improved, but manufacturing precision requirements increase
Solution Approach 1:
Each microreflector arrangement is assigned specific local qualities including particular tilt angle ranges, motif types, and color characteristics. This allows different regions of the security element to have specialized properties optimized for their specific viewing conditions, with microreflectors in each arrangement having uniformly adjusted orientation parameters tailored to their designated tilt angle range.
Solution Approach 2:
The patent systematically varies key parameters of the microreflector arrangements, including tilt angle ranges, motif configurations, and color imparting layers, to create distinct visual effects across different viewing conditions. By changing these parameters in a controlled manner across different arrangements, the system achieves high visual attractiveness while maintaining manufacturability through parameterized design.
3Manufacturing precision
If a coating grid with visible grid elements is used, then motif alignment and security feature definition are improved, but visual attractiveness may be compromised
Solution Approach 1:
The coating grid is applied with visible grid elements that provide sufficient alignment precision for defining security motifs, accepting that the grid visibility itself becomes part of the security feature rather than attempting to completely eliminate grid visibility. The grid's presence is intentional and functional, providing clear demarcation of security zones while the overall visual attractiveness is maintained through the coordinated design of multiple microreflector arrangements.
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 provides enhanced security against counterfeiting and increased visual attractiveness by ensuring rapid recognition of movement and static motifs in different colors, making it difficult to replicate.
Implementation Method 1
The optically variable security element shows viewers, for example, different motifs or different states of a moving motif at different viewing angles
Data Source
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AI summary
The invention relates to an optically variable security element (2), having a microreflector arrangement (32; 42) comprising a plurality of directionally reflecting microreflectors (35,36; 45,46) and a first motif of a first security feature (26; 96), which appears as a reflection for the observer by the alignment of the microreflectors (36; 46) dependent on the angle of tilt, wherein the microreflectors are provided with a coating pattern (37,38; 47,48) in a pattern zone. The pattern elements (38; 48) of the coating pattern are present in a pattern size such that the pattern elements (38; 48) can be perceived by the observer. The coating pattern (37,38; 47,48) causes the motif of the first security feature (26; 96) to appear as a patterned motif.