Pyramidal Structured Surfaces for Rotation-Based Color Shift
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Solution Overview
Problem
Existing color-shifting coatings require the observer to change the angle of the substrate relative to the light source to achieve a color shift, limiting their application in creating dynamic color effects through rotation.
Innovation Solution
An array of pyramidal structures coated with optically variable color-shifting coatings on a substrate, where each structure has at least three slanted faces, allowing color variation when the substrate or viewer rotates, with the coating design optimizing dielectric thickness and geometry to enhance color shift effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional color-shifting coatings are applied to a substrate, then the coating exhibits color shift when the viewing angle changes, but the observer must actively shift the substrate angle relative to the light source to achieve the color shift effect
Solution Approach 1:
The substrate surface is segmented into an array of pyramidal structures, each with multiple slanted faces. This segmentation allows different faces to present different colors at different rotation angles, enabling passive color shift observation without requiring the observer to actively change the viewing angle. The pyramidal geometry divides the surface into discrete optical elements that collectively produce the color shift effect through rotation.
Solution Approach 2:
The invention introduces rotational dynamics to the substrate, transforming it from a static surface to a dynamically rotatable one. As the substrate rotates, the pyramidal structures present different faces to the observer, dynamically changing the perceived color. This dynamic rotation replaces the need for active viewing angle adjustment, making the color shift effect easier to observe while adding rotational movement capability.
2Adaptability or versatility
If the substrate is made rotatable to enable color variation by rotation, then dynamic color effects are achieved, but the structural complexity increases
Solution Approach 1:
The invention adds a rotational dimension to the substrate, transforming it from a two-dimensional static surface to a three-dimensional rotatable object. This additional rotational degree of freedom enables versatile color display by allowing the substrate to present different colors through rotation, while the pyramidal surface structure provides the optical variation needed for effective color shifting during rotation.
3Reliability
If pyramidal structures with multiple slanted faces are created, then color shift effect is enhanced during rotation, but manufacturing precision requirements increase
Solution Approach 1:
The pyramidal structures are designed with uniform geometry and consistent coating across all faces. This homogeneity ensures that each pyramid behaves predictably during rotation, providing consistent color shift effects. By making all pyramidal elements identical and uniformly coated, the invention achieves reliable and repeatable color shifting behavior, reducing the impact of manufacturing variations on overall performance.
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 a visually appealing and dynamic color shift effect by rotation, with optimal color travel observed as the substrate rotates, achieving a strong color shift without requiring differences in dielectric thickness across faces, and allowing for secure and encoded visual patterns.
Implementation Method 1
optically variable color-shifting coating... exhibit the property of changing color upon variation of the angle of incident light, or as the viewing angle of the observer is shifted
Implementation Method 2
the faces of the structures are substantially planar and/or may have a diffraction grating formed therein
Data Source
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AI summary
An optically variable device is disclosed having a substrate with an array of pyramidal structures formed upon it or within it. The structures are coated with an optically variable color-shifting coating. Each of the structures form a pyramidal-like having at least three slanted faces and wherein one or more colors seen when viewing the pyramids vary as substrate is rotated at least 30 degrees about an axis orthogonal to the substrate. In order to see a color shift the device is rotated around the surface normal of the substrate, while keeping the angle of incidence to the light source the same, and keeping the viewing angle the same. Various forms of pyramids may be used, however pyramids with planar faces are most suitable.