Dipole Magnet Layout for Ortho-Parallactic Security Coatings
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Solution Overview
Problem
There is a need for reliable and efficient processes to produce optical effect layers (OELs) exhibiting an ortho-parallactic effect using oriented magnetic or magnetizable pigment particles, which are difficult to produce on a mass scale and require high production speed while being resistant to counterfeiting.
Innovation Solution
The use of magnetic assemblies comprising sets of bar dipole magnets and square-shaped or rectangle-shaped dipole magnets, embedded in a supporting matrix, to generate a magnetic field that orients non-spherical oblate magnetic or magnetizable pigment particles in a radiation curable coating composition, followed by partial curing to fix their positions and orientations, resulting in an ortho-parallactic optical effect.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If magnetic assemblies with multiple dipole magnets are used to produce ortho-parallactic optical effect layers, then the security feature becomes difficult to counterfeit and provides enhanced security, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The magnetic assembly is segmented into multiple independent dipole magnets (bar-shaped and square/rectangular-shaped magnets) arranged in specific configurations. Each magnet contributes to creating specific regions of magnetic field orientation, allowing complex ortho-parallactic effects to be built from simpler individual magnetic elements. This segmentation enables the system to achieve high security resistance while maintaining manageable complexity through modular design.
Solution Approach 2:
The patent introduces a new dimension of complexity by using dipole magnets with different shapes (bar-shaped versus square/rectangular) and different orientations. The combination of these different geometric dimensions creates unique magnetic field patterns that are difficult to replicate. The vector sum of magnetic axes from magnets in different orientations creates a multi-dimensional magnetic field configuration that enhances security resistance.
2Ease of manufacture
If oriented magnetic pigment particles are used to create dynamic optical effects, then the visual recognition and security detection become easier, but the manufacturing precision and production difficulty increase
Solution Approach 1:
The magnetic pigment particles are pre-oriented within the coating composition before application to the substrate. The coating composition is formulated with magnetic particles that can be oriented by the magnetic assembly during or after application. This preliminary preparation of the coating composition with magnetically responsive particles enables the dynamic optical effects to be achieved with controlled precision, making the security feature easily recognizable while managing manufacturing requirements.
Solution Approach 2:
The patent controls the orientation of magnetic particles by manipulating magnetic field parameters (strength, direction, distribution) generated by the dipole magnets. By adjusting the configuration and orientation of the dipole magnets, precise control over particle alignment is achieved. This parameter control enables manufacturing of security features with consistent optical effects that are easy to recognize, while the precision is managed through field parameter optimization rather than mechanical precision requirements.
3Productivity
If high production speed is required for manufacturing security features, then the productivity increases, but the manufacturing precision and quality control become more difficult
Solution Approach 1:
The patent replaces mechanical orientation methods with magnetic field-based orientation of pigment particles. Instead of using mechanical means to align particles during manufacturing, the magnetic assembly generates fields that automatically orient the magnetic pigment particles in the desired patterns. This substitution enables high production speeds because the magnetic orientation process is rapid and can be integrated into continuous coating operations, while maintaining consistent optical effects through controlled magnetic field parameters.
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 production of OELs with an ortho-parallactic effect that is difficult to replicate, providing enhanced security features for documents and articles by creating a dynamic optical effect that is resistant to counterfeiting and easy to recognize.
Implementation Method 1
exposing the radiation curable coating composition to a magnetic field of a static magnetic assembly (x00) described herein so as to orient at least a part of the non-spherical oblate magnetic or magnetizable pigment particles
Implementation Method 2
at least partially curing the radiation curable coating composition of step ii) to a second state so as to fix the non-spherical oblate magnetic or magnetizable pigment particles in their adopted positions and orientations
Data Source
Figure 1A~1C
Figure 2A~2C
Figure 2D-1~2E
AI summary
The present invention relates to the field of magnetic assemblies and processes for producing optical effect layers (OELs) comprising magnetically oriented non-spherical oblate magnetic or magnetizable pigment particles on a substrate. In particular, the present invention relates to magnetic assemblies processes for producing said OELs as anti-counterfeit means on security documents or security articles or for decorative purposes.