Optical Security Element With Dual-Magnet Platelet Alignment
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Solution Overview
Problem
Existing methods for producing optical security elements, such as those used in banknotes, lack the capability to generate varying and efficient optical effects, and require improvements in production systems to reduce time and costs.
Innovation Solution
An assembly comprising a first magnet positioned below a substrate with a composition of magnetizable platelets and a second magnet positioned above the substrate, where the substrate moves between two cylinders with embedded magnets, allowing for the alignment of platelets in a magnetic field extending from XY to Z direction, enabling diverse optical effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single cylinder with embedded magnets is used to align magnetic particles, then the production process is simple, but only a singular optical effect can be produced
Solution Approach 1:
The patent divides the single magnetic assembly into multiple separate magnetic assemblies (first and second magnetic assemblies positioned at different locations). Each assembly independently aligns platelets in its own magnetic field, enabling multiple optical effects to be produced simultaneously on different regions of the substrate, thus resolving the contradiction between versatility and complexity.
Solution Approach 2:
The patent introduces a second magnetic assembly positioned above the substrate in addition to the first magnetic assembly below the substrate. This adds a new spatial dimension to the magnetic field configuration, allowing platelets to be aligned in multiple directions (X-coordinate by first assembly, Y-coordinate by second assembly), thereby producing varied optical effects without excessive complexity.
2Adaptability or versatility
If platelets are oriented along X and Y coordinates with magnetic assemblies moving at the same speed as substrate, then many optical effects are produced, but the production time increases
Solution Approach 1:
The patent combines multiple magnetic assemblies into a single integrated system that processes the substrate simultaneously. The first and second magnetic assemblies work together in parallel to align platelets in both X and Y coordinates during one pass through the production line, achieving multiple optical effects without increasing production time, thus resolving the contradiction between versatility and productivity.
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 assembly enables the production of articles with varied optical effects by aligning magnetizable platelets in a multi-dimensional magnetic field, producing images that morph or deform upon tilting, enhancing security and visual appeal.
Implementation Method 1
The embedded magnets produce a magnetic field that protrudes from one magnet toward another and mostly along a plane of the substrate. The magnetic particles in the ink composition are therefore subjected to this magnetic field
Implementation Method 2
a first magnet; a substrate positioned above the first magnet, and having a surface for receiving a composition including a plurality of magnetizable platelets; and a second magnet, positioned above the substrate
Data Source
AI summary
An assembly including a first magnet; a substrate positioned above the first magnet, and having a surface for receiving a composition including a plurality of magnetizable platelets; and a second magnet, positioned above the substrate is disclosed. The assembly can be used in a method of making an optical security element. The optical security element and the method of making the optical security element are also disclosed.