Optical Effect Layers with Oriented Magnetic Pigments
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Solution Overview
Problem
Current security features based on oriented magnetic particles in inks or coating compositions lack bright, eye-catching optical effects that are easily verifiable by the unaided eye and difficult to produce on a mass scale, while also being challenging for counterfeiters to replicate.
Innovation Solution
The development of optical effect layers (OELs) using non-spherical oblate magnetic or magnetizable pigment particles oriented in a circularly symmetric pattern, which create a viewing-angle dependent apparent motion, such as circularly moving spots or comet-shaped spots, through the use of spinning magnetic assemblies with skew magnetic axes, making them difficult to produce without specialized equipment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional magnetic particle orientation methods are used, then security features can be produced, but they lack bright eye-catching optical effects that are easily verifiable by the unaided eye
Solution Approach 1:
The patent changes the orientation parameters of magnetic pigment particles from random or simple alignment to a specific circularly symmetric pattern with controlled zenithal deflection angles and azimuth angles. This parameter change creates the circularly moving spot effect that appears bright and eye-catching to the unaided eye while maintaining manufacturability through standardized magnetic field application processes
Solution Approach 2:
The patent utilizes the optical properties of magnetic pigment particles that change their appearance based on orientation and viewing angle. The circularly symmetric orientation pattern creates a circularly moving spot that displays dynamic color and brightness changes as the coating is tilted, providing the eye-catching optical effect without requiring complex manufacturing
2Reliability
If magnetic field application methods are used to orient particles, then security features can be produced, but they are difficult to replicate by counterfeiters without specialized equipment
Solution Approach 1:
The patent replaces complex mechanical positioning systems with a magnetic field-based orientation method. By using magnetic pigment particles that respond to magnetic fields, the system achieves precise circularly symmetric orientation without requiring complex mechanical equipment, thereby maintaining anti-counterfeit capability while simplifying the manufacturing process
Solution Approach 2:
The patent introduces magnetic field lines as an intermediary between the equipment and the pigment particles. The magnetic field serves as a mediator that transfers the orientation instruction to the particles, enabling precise circularly symmetric patterns to be formed using relatively simple magnetic field generation equipment rather than complex mechanical positioning systems
3Adaptability or versatility
If non-spherical oblate magnetic pigment particles are oriented in circularly symmetric pattern, then viewing-angle dynamic appearance is achieved, but manufacturing precision requirements increase
Solution Approach 1:
The patent employs periodic magnetic field application during the coating process to achieve circularly symmetric orientation of non-spherical oblate pigment particles. The periodic magnetic field lines create a circularly moving spot effect that displays dynamic appearance at different viewing angles, while the periodic nature of the field application ensures consistent and reproducible orientation patterns
Solution Approach 2:
The patent creates a dynamic optical effect where the circularly moving spot appears to move and change appearance as the coating is tilted at different angles. This dynamic behavior is achieved through the circularly symmetric orientation pattern of magnetic pigment particles, which maintains adaptability across different viewing conditions while using standardized manufacturing processes
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 OELs provide a reliable and aesthetically appealing security feature that is easily recognizable by the unaided eye, while being challenging to replicate, thus enhancing the authenticity protection of security documents and articles.
Implementation Method 1
spinneable magnetic assemblies with skew magnetic axes
Implementation Method 2
non-spherical oblate magnetic or magnetizable pigment particles
Implementation Method 3
providing an optical impression of at least one circularly moving spot or at least one comet-shaped spot rotating
Data Source
Figure 1A~1B
Figure 2A~2B
Figure 2C~2D
AI summary
The present invention relates to the field of optical effect layers (OEL) comprising magnetically oriented non-spherical oblate magnetic or magnetizable pigment particles on a substrate, spinneable magnetic assemblies and processes for producing said optical effect layers (OEL). In particular, the present invention relates to spinneable magnetic assemblies and processes for producing said OELs as anti- counterfeit means on security documents or security articles or for decorative purposes.