Micro-optic Security Device with Stitched Icon Arrays
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Solution Overview
Problem
Existing micro-optic security devices struggle to seamlessly transform projected images into multiple different images along their horizontal and vertical axes, and they are limited in complexity and resistance to simulation.
Innovation Solution
A micro-optic security device employing planar arrangements of stitched icons, where each icon is composed of slices from multiple designs that abut or overlap, and paired with microlenses to form synthetically magnified images that change as the device is tilted or viewed from different angles, allowing for complex and integrated image formations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional micro-optic security devices use simple icon arrays, then the device structure is simple and easy to manufacture, but the image transformation capability is limited and resistance to counterfeiting is reduced
Solution Approach 1:
The patent divides icons into multiple slices arranged in concentric circles around a focal point. Each slice can be independently positioned and oriented, allowing complex image transformations while maintaining manageable manufacturing complexity. The sliced icon structure enables progressive image changes as viewing angle changes, resolving the contradiction between transformation capability and structural simplicity.
Solution Approach 2:
The patent introduces angular/rotational dimension by arranging icon slices in concentric circles around a focal point. This radial arrangement allows images to transform progressively as the viewing angle changes, adding a temporal dimension to the visual effect without increasing linear device dimensions. The angular positioning of slices enables complex image sequences to be achieved within a compact circular footprint.
2Adaptability or versatility
If micro-optic security devices use abrupt icon element pattern changes, then the transformation between images is achieved, but the transition is not smooth and visual continuity is lost
Solution Approach 1:
By dividing icons into multiple slices arranged radially, the patent creates natural transition zones between adjacent slices. As the viewing angle changes, slices become visible or hidden progressively, creating smooth transitions between different image states. The radial arrangement ensures that transitions occur gradually across angular sectors rather than abruptly at single boundaries.
Solution Approach 2:
The patent creates dynamic image transformations where the visible icon elements change progressively with viewing angle. The radial slice arrangement allows different portions of the icon to be revealed or hidden in sequence as the observer moves, creating animated-like transitions. This dynamic approach replaces static abrupt changes with continuous angular-dependent transformations.
3Reliability
If micro-optic security devices project single images at each viewing angle, then the device complexity is low, but the resistance to simulation and counterfeiting is reduced
Solution Approach 1:
The patent merges multiple icon designs into a single radial arrangement around a focal point. Multiple complete icons are distributed angularly around the circle, each at different radial distances. This consolidation allows multiple images to be projected from a single device structure, increasing counterfeiting resistance while avoiding the need for multiple separate optical systems.
Solution Approach 2:
The patent uses angular distribution to pack multiple images into a compact circular area. By arranging icons radially around a focal point at different angular positions and radial distances, the device projects multiple images within a small footprint. This two-dimensional radial packing (angular + radial dimensions) enables high image density without increasing linear device dimensions, making the complex multi-image projection practical for security applications.
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 device achieves smooth transitions of synthetically magnified images, providing increased complexity and resistance to counterfeiting by projecting multiple images simultaneously or successively, with visual effects like orthoparallactic movement and depth perception, enhancing security features.
Implementation Method 1
The microlenses have a repeat period within the array. The focal points of at least some of the microlenses are substantially aligned with slices in the stitched icons. The distance between the planar arrays is sufficient for the microlenses to form synthetically magnified images
Implementation Method 2
Each microimage is defined by an anti-reflection structure (e.g., a moth-eye structure) on the substrate, which is formed by a periodic array of identical structural elements and an at least partially reflecting layer. Light passing through the substrate and impinging on the microimages is reflected to a different extent than light which does not impinge on the microimages
Data Source
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Figure 3A~3B
AI summary
A micro-optic security device that employs one or more planar arrangements of stitched icons and that projects at any given viewing angle one or more synthetically magnified images, is provided. The synthetically magnified image(s) constitutes either a single or multipart image(s) that optionally changes to a different image(s) as the security device is tilted, or as the viewing angle changes.