Micro-Optic Structure With Recessed Imagery for Stable Magnified Images
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Solution Overview
Problem
Existing micro-optic security devices face challenges in controlling the phase and skew of focusing and imagery elements, leading to inconsistent and distorted images due to manufacturing variations, and the application of ink requires precise mechanical tolerances, resulting in high spoilage and costs.
Innovation Solution
A micro-optic device with a unitary structure featuring recessed imagery elements and a coating of ink applied at specific pressures and loadings to provide visual contrast, using either colored ink or a different refractive index to enhance image clarity and reduce manufacturing defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If focusing elements and imagery elements are formed by different processes or different units on the same printing press, then manufacturing flexibility is improved, but phase control between the two elements deteriorates
Solution Approach 1:
The patent combines focusing elements and imagery elements into a single integrated structure formed by one embossing process. This merging ensures that both elements are created simultaneously with precise phase relationships, eliminating the phase control problems that arise when they are formed by separate processes or different printing units.
2Illumination intensity
If ink is applied to protruding imagery elements, then visual contrast in magnified image is improved, but mechanical tolerance requirements increase
Solution Approach 1:
Instead of having imagery elements protrude from the substrate surface, the patent inverts the configuration so that imagery elements are recessed below the surface while focusing elements remain at or near the surface. This inversion allows ink to be applied to the recessed imagery elements without requiring tight mechanical tolerances, as the ink can be contained within the recesses during the printing process.
3Illumination intensity
If imagery elements protrude from focusing elements, then ink application for contrast is improved, but manufacturing complexity increases
Solution Approach 1:
The patent merges the formation of focusing elements and imagery elements into a single embossing step that creates both features simultaneously. This integrated approach reduces manufacturing complexity by eliminating the need for separate processes to create protruding imagery elements, while still achieving the desired ink application and visual contrast.
4Ease of manufacture
If there is rotational skew between focusing elements and imagery elements, then manufacturing alignment is improved, but image quality deteriorates
Solution Approach 1:
By forming focusing elements and imagery elements in the same embossing process, the patent ensures they are created with identical orientation and positioning. This eliminates rotational skew between the two element types, as they are both defined by the same embossing pattern, thereby maintaining high image quality without compromising manufacturing ease.
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 improved image contrast and reduces manufacturing spoilage by stabilizing the phase and skew of elements, enabling cost-effective production of secure documents with consistent, high-contrast magnified images.
Implementation Method 1
a property of the ink provides a visual contrast in the magnified image
Data Source
AI summary
The present disclosure relates to a micro-optic device for producing a magnified image, including: a first unitary structure on one side of a substrate, the first unitary structure including a first group of focusing elements and a first group of imagery elements, wherein one of the first group of focusing elements and the first group of imagery elements is recessed with respect to the other, wherein the device further includes at least a first coating of ink overprinted on the first unitary structure, to at least partially fill the recessed group of elements, and wherein a property of the ink provides a visual contrast in the magnified image.