Angled Reflective Ribbons for Ortho-Parallactic Security Effects
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Solution Overview
Problem
Existing optically variable devices lack the ability to create a dynamic, ortho-parallactic optical effect that provides a moving reflective image or shape when tilted, which is desirable for security and authentication purposes.
Innovation Solution
The development of articles with reflective ribbons or micro-mirrors arranged in helical or spiral configurations on a base layer, where the angles of the ribbons or mirrors change along their length, creating a helical or bi-helical structure that generates an ortho-parallactic optical effect by reflecting light in a direction orthogonal to the tilting motion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional optically variable devices use flat or simple curved reflective surfaces, then the manufacturing process is simple, but the optical effect is static and lacks dynamic movement when tilted
Solution Approach 1:
The patent applies helical and spiral curvature to reflective ribbons and micro-mirrors, transforming simple flat or uniformly curved surfaces into complex three-dimensional curved structures. This curvature variation along the length of the ribbons creates the ortho-parallactic effect where reflected light moves perpendicular to the tilting direction, providing dynamic optical effects that enhance authentication security while maintaining manufacturability through embossing or coating processes
Solution Approach 2:
The patent segments the reflective surface into multiple discrete ribbons or micro-mirrors arranged in helical or spiral patterns. Each segment has its own orientation and curvature, allowing independent control of light reflection from different portions. This segmentation enables the complex ortho-parallactic effect to be achieved through assembly of simpler components, balancing optical complexity with manufacturing feasibility
2Reliability
If reflective ribbons are arranged in straight parallel lines, then the structure is simple to manufacture, but no ortho-parallactic optical effect is generated
Solution Approach 1:
The patent transforms straight parallel ribbon arrangements into helical and spiral configurations where the ribbons follow curved three-dimensional paths. This curvature causes the angle of incidence and reflection to vary continuously along the ribbon length, generating the ortho-parallactic effect where reflected light moves perpendicular to the tilting direction. The helical and spiral patterns can be manufactured through embossing, molding, or selective coating techniques
Solution Approach 2:
The patent varies the orientation angle, curvature radius, and pitch of the reflective ribbons along their length to create the ortho-parallactic effect. By changing these geometric parameters continuously or in steps along the ribbon, the reflection direction changes dynamically when tilted, creating the characteristic optical effect. These parameter variations can be controlled during manufacturing to achieve the desired optical performance
3Reliability
If the reflective surface uses uniform orientation throughout, then manufacturing is straightforward, but the optical effect does not change with observation angle
Solution Approach 1:
The patent applies different orientation angles and curvature characteristics to different local regions of the reflective surface. Each segment or portion of the helical/spiral ribbons has locally optimized geometry to contribute to the overall ortho-parallactic effect. This local variation in quality (orientation, curvature) across the surface creates the angle-dependent optical effects while allowing each local region to be manufactured with standard precision
Solution Approach 2:
The continuous curvature of helical and spiral ribbons creates gradual changes in reflection angle across the surface. This curved geometry ensures that different observation angles intercept different portions of the ribbon at different local orientations, producing the color-shifting and movement effects. The curvature profile can be designed to control the rate and pattern of optical effect changes
4Reliability
If simple reflective coatings are applied, then production cost is low, but no dynamic moving image effect is produced when tilted
Solution Approach 1:
The patent creates three-dimensional helical and spiral structures that rise from the substrate surface, forming raised ribbons or embossed patterns. This vertical dimension and curved geometry cause light to reflect from different heights and angles when tilted, creating the dynamic moving image effect. The three-dimensional structure can be formed through embossing, extrusion, or additive manufacturing, adding optical complexity without requiring complex multi-layer coatings
Solution Approach 2:
The patent divides the reflective surface into multiple discrete helical or spiral ribbons spaced apart from each other. Each ribbon acts as an independent optical element that contributes to the overall effect. This segmentation allows the complex three-dimensional structure to be manufactured as repeating units or modules, reducing overall complexity while maintaining the dynamic optical effects through the collective behavior of multiple segments
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 produces a visually appealing and secure ortho-parallactic optical effect, enhancing authentication and anti-counterfeiting features by creating a moving reflective image or shape that appears to move transversely when the article is tilted, providing a dynamic and distinctive visual signature.
Implementation Method 1
an array of reflective ribbons or micro-mirrors arranged in a helical or bi-helical configuration... reflecting light in a direction orthogonal to the tilting motion
Data Source
Figure 1A~2
Figure 3A~3C
Figure 4A~4C
AI summary
According to examples, an article may include a base layer that extends along a first dimension and a second dimension, in which the second dimension is orthogonal to the first dimension. The article may also include reflective ribbons provided on an upper surface of the base layer, in which the reflective ribbons positioned along a common plane extending in the second dimension have dihedral angles that change as a function of distance across the common plane.