Diffraction Grating Cells for Anti-Forgery Information Recording
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Solution Overview
Problem
Existing information recording mediums using diffraction gratings or holograms face challenges in maintaining high anti-forgery effects while ensuring accurate information reading, especially on uneven surfaces like paper, where surface roughness can lead to incorrect data reproduction and ease of copying.
Innovation Solution
The use of an information recording medium with a two-dimensional arrangement of diffraction grating cells, where specific types of cells act as information recording elements and others as hiding elements, combined with a light source and reading apparatus that illuminates and images the diffraction patterns to enhance forgery prevention and accurate data retrieval.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If diffraction grating cells are arranged in a two-dimensional pattern with varying angles and pitches, then anti-forgery effect is improved and visual distinguishability is reduced, but device complexity increases
Solution Approach 1:
The information recording medium is divided into multiple diffraction grating cells arranged in a two-dimensional pattern. Each cell contains microscopic information recording elements with specific diffraction characteristics, segmenting the overall security feature into numerous small functional units that collectively provide high anti-forgery protection through their complex spatial arrangement.
Solution Approach 2:
Different regions of the diffraction grating cells are assigned different local qualities, including varying grating angles, pitches, and orientations. This local variation creates a complex diffraction pattern that is difficult to replicate, enhancing the anti-forgery effect while maintaining a relatively simple overall structure that can be manufactured using conventional techniques.
2Adaptability or versatility
If diffraction grating cells are used on uneven surfaces, then information recording capability is maintained, but measurement precision deteriorates due to surface roughness
Solution Approach 1:
The invention transitions from considering only the two-dimensional surface pattern to incorporating the third dimension of light propagation. By carefully designing the diffraction angles and pitches of the grating cells, the system creates a three-dimensional diffraction pattern that can be read from specific angles, making it insensitive to surface unevenness and enabling accurate information retrieval even on rough substrates like paper.
Solution Approach 2:
The diffraction grating cells are designed with specific parameters including grating pitch, grating angle, and orientation that are optimized to maintain stable diffraction patterns despite surface variations. These parameter choices ensure that the optical path differences introduced by surface roughness do not significantly affect the overall diffraction pattern, preserving measurement precision on uneven surfaces.
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
This solution provides a high anti-forgery effect and accurate information reading by utilizing diffraction grating cells with varying angles and pitches, making it difficult to distinguish the information recording area visually and improving stability against surface unevenness, thus preventing incorrect data reproduction.
Implementation Method 1
an information recording medium including a two-dimensional arrangement of diffraction grating cells (10), each cell being formed of a diffraction grating
Data Source
AI summary
In an information recording medium, in which an information recording medium has diffraction grating cells arranged therein, a plurality of types of the diffraction grating cells make up one information recording area. At least one type of the diffraction grating cells included in the diffraction grating cells making up the information recording area are information recording elements, while the other types of the diffraction grating cells included in the diffraction grating cells making up the information recording area are information hiding elements. The information is recorded by two-dimensional arrangement of the diffraction grating cells constituting the information recording elements in the information recording area.