Grating Image with Achromatic Viewing-Angle Effects
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Solution Overview
Problem
Current grating images used for security purposes lack advanced optical effects and forgery security, with existing achromatic structures appearing matte and non-colored from all viewing angles, failing to provide dynamic visual movements.
Innovation Solution
Achromatic grating areas with randomly varying orientation parameters within a limited angular range, combined with diffractive structures, are arranged to create a viewing-angle-dependent appearance, simulating movement when the viewing angle changes, utilizing electron beam lithography to produce grating images with specific optical effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If uniform holographic diffraction gratings are used to cover the entire surface, then the structure is simple and easy to manufacture, but the optical effect is static and achromatic from all viewing angles
Solution Approach 1:
The grating image is divided into multiple achromatic grating areas, each with different mean orientations of grating lines. This segmentation allows each area to contribute to different viewing angle ranges, creating dynamic optical effects while maintaining manufacturing simplicity through systematic arrangement of standardized grating patterns.
Solution Approach 2:
Different regions of the grating image are assigned different local properties through varying grating line orientations. Each achromatic grating area has a specific mean orientation that creates distinct optical characteristics for different viewing angles, enabling spatially varying optical effects without complex manufacturing.
2Adaptability or versatility
If grating lines are arranged with random orientation variation to create matte structures, then the appearance is uniformly matte from all angles, but no viewing angle-dependent movement effect is achieved
Solution Approach 1:
The orientation parameter of grating lines is systematically varied across different achromatic grating areas rather than being completely random. This controlled parameter change creates a gradient of optical properties that produces viewing angle-dependent movement effects while maintaining the matte appearance characteristic of scattering structures.
3Loss of information
If multiple different grating patterns are used to create diverse image motifs, then the image complexity and information capacity increase, but the manufacturing complexity and potential for forgery increase
Solution Approach 1:
The grating image utilizes dynamic optical effects where achromatic grating areas with different orientations create movement illusions when viewing angle changes. This dynamic behavior provides security against forgery through optical complexity rather than structural complexity, as the movement effect cannot be replicated by simple copying of static patterns.
Solution Approach 2:
The grating image combines multiple grating patterns with different orientations and properties into a composite structure. This composite approach enables diverse image motifs and enhanced security features while distributing the complexity across multiple standardized grating area types that can be manufactured using systematic processes.
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 achieves a visually dynamic, matte appearance that changes with viewing angle, enhancing forgery security by creating the illusion of moving patterns, while integrating achromatic and diffractive structures within a grating image, providing new optical effects and increased security.
Implementation Method 1
The respective achromatic grating area of the grating image contains a grating pattern influencing electromagnetic radiation with line grating lines
Implementation Method 2
When one of the parameters varies randomly, one speaks of so-called matt structures. When viewed, these show no diffractive effects, but rather scattering effects and have a matt appearance
Data Source
Figure 1~2b
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Figure 5
AI summary
The invention relates to a grating image with achromatic grating areas which have a viewing-angle-dependent appearance, in which a visible movement effect occurs when the viewing angle changes.