Optical Security Component Diffractive Facet Slope Modulation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing optical security components lack the ability to provide complex dynamic visual effects that ensure robust authentication through simple visual control without specialized equipment, and they often fail to seamlessly transition between achromatic and iridescent animations.
Innovation Solution
An optical security component with a transparent layer and a diffractive structure featuring facets with varying slopes, modulated by a diffraction grating, allowing for a dynamic visual effect that transitions from achromatic to iridescent animations through a wide angular range via a simple tilt movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a diffractive structure with facets of variable slope modulated by a diffraction grating is used, then complex dynamic visual effects with seamless transition between achromatic and iridescent animations are achieved, but the manufacturing precision requirements increase
Solution Approach 1:
The diffractive structure is segmented into multiple facets within each module, where each facet has a specific slope angle. By dividing the continuous slope variation into discrete facet segments, the patent achieves complex dynamic visual effects while making the manufacturing process feasible through standardized fabrication techniques.
Solution Approach 2:
Each facet within a module has a locally optimized slope angle designed to produce specific diffraction patterns. The slope angles vary locally across different facets to create the desired visual effects, allowing precise control over the optical properties in different regions of the security component.
2Reliability
If modules with maximum width less than 300 μm are used to create dynamic visual effects, then authentication security is enhanced, but the device complexity increases
Solution Approach 1:
The patent uses multiple identical or similar modules arranged in specific patterns to create the desired visual effects. By replicating standardized module designs rather than creating unique complex structures, the patent enhances security through precise arrangement while controlling device complexity through modular reproduction.
Solution Approach 2:
The patent arranges modules in two-dimensional arrays with specific spatial relationships, using the arrangement dimension to encode authentication information. This allows enhanced security through complex patterns while maintaining individual module simplicity, as the security comes from the overall arrangement rather than individual element complexity.
3Ease of operation
If a wide angular range is used for tilt movement to enable simple visual control, then ease of operation improves, but the loss of information increases due to potential gaps in animation sequences
Solution Approach 1:
The patent designs the facet slope angles and module arrangements to dynamically adapt the diffraction patterns across a wide angular range. The dynamic optical response ensures that the visual effects remain continuous and informative throughout the entire tilt range, preventing information loss while maintaining ease of operation.
Solution Approach 2:
The patent ensures continuous visual feedback throughout the tilt angular range by carefully designing the facet slopes and module configurations. The optical paths are arranged so that diffraction patterns remain visible and meaningful across all angles, eliminating gaps in the animation sequence and maintaining information continuity throughout the motion range.
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 enhanced authentication security by ensuring uninterrupted sequences of iridescent and achromatic animations, creating a stronger technological barrier against reproduction, thus enhancing document verification.
Implementation Method 1
a diffractive structure featuring facets with varying slopes, modulated by a diffraction grating, allowing for a dynamic visual effect that transitions from achromatic to iridescent animations
Implementation Method 2
An observer can then observe a luminous and/or colored area which moves along an image when he rotates the component
Data Source
Figure 1A~1B
Figure 2
Figure 3
AI summary
The invention relates to an optical safety component (40) configured to be observed in reflection in an observation direction (ΔO) forming an observation angle (θobs) with an illumination direction (ΔL). The component comprises a diffractive structure with a first pattern consisting of a set of parallel facets which have variable slopes in a slope variation direction and which are arranged to produce a dynamic visual effect in a given angular tilt range (Δθtilt). In at least one region, the first pattern is modulated by a grating designed to produce a reflective diffraction effect at order 1 and order -1. The period of the grating, the maximum angular value of the slopes, and the angle of observation are designed to produce an achromatic animation in a first part (ΔθB) of the angular tilt range and to produce the same, iridescent, animation in a second part (ΔθR-; ΔθR+) of the angular tilt range in sequence with the achromatic animation on both sides of the first part of the angular tilt range.