Hologram Master With Segmented Diffraction Structures
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Solution Overview
Problem
Current methods for producing hologram masters for security elements with optically variable, kinetic features are complex and not suitable for series production, as they struggle to create individualized holograms that provide a three-dimensional impression with changing views from different directions, and kinetic diffraction structures are difficult to design for each security element.
Innovation Solution
A hologram master with multiple diffraction structures, each having unique reconstruction geometries, is created, allowing for the production of individualized holograms with uniformly homogeneous diffraction efficiency, enabling easy verification and series production of security elements with optically variable features.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If complex methods are used to produce three-dimensional holograms with changing views, then the holographic security feature provides enhanced verification capability, but the production complexity increases and series production becomes difficult
Solution Approach 1:
The master hologram is segmented into multiple diffraction structures, each responsible for a specific viewing angle or direction. This segmentation allows the complex three-dimensional information to be divided into manageable components that can be individually produced and combined, reducing overall production complexity while maintaining verification reliability
Solution Approach 2:
The invention changes the parameters of the diffraction structures, specifically their diffraction efficiencies, to control how light is redirected at different viewing angles. By adjusting these parameters during production, individualized holograms with specific optical characteristics can be created through a standardized process, enabling series production while maintaining enhanced verification capabilities
2Reliability
If individualized holograms are produced for each security element, then the authenticity verification is enhanced, but the production time and complexity increase
Solution Approach 1:
The master hologram is pre-produced with all necessary diffraction structures embedded in a single master element. This preliminary action allows multiple individualized holograms to be subsequently produced from one master through a streamlined copying process, enhancing authenticity verification while maintaining high productivity for series production
Solution Approach 2:
The invention uses a copying process where individualized holograms are produced by copying from a single master hologram. This copying approach enables rapid production of multiple security elements with unique holographic features, maintaining both authenticity verification reliability and high productivity for series production
3Adaptability or versatility
If kinetic diffraction structures are designed for each security element, then the optically variable security feature is enhanced, but the design and production complexity increase
Solution Approach 1:
Different regions of the master hologram are assigned different local qualities, specifically different diffraction efficiencies, to create kinetic effects at specific locations. This allows optically variable features to be enhanced in targeted areas without increasing overall design complexity, as the variations are achieved through localized parameter adjustments rather than complex global design
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 approach enables the production of individualized holograms for security elements with varying information perspectives, enhancing authenticity verification and kinetic effects, while maintaining high diffraction efficiency and brightness, suitable for series production.
Implementation Method 1
a plurality of different diffraction structures are formed in the master body (1010), which have different reconstruction geometries
Implementation Method 2
the holographic storage medium is irradiated by both diffracted and non-diffracted coherent light, such that an interference between the diffracted and non-diffracted coherent light is stored as a hologram
Implementation Method 3
a holographic storage medium, in particular a photopolymer, is brought into mechanical contact with the one surface (1011)
Data Source
Figure 1~2
Figure 3
Figure 4a~4c
AI summary
The invention relates to a hologram master (1000) for generating security elements (5001) with an optically variable holographic security feature, comprising a master body (1010) with a surface (1011), wherein several different diffraction structures (1120, 1220, 1320) are formed in the master body (1010), wherein each of the several different diffraction structures (1120, 1220, 1320) has a reconstruction geometry that differs from the reconstruction geometries of the other several different diffraction structures (1120, 1220, 1320), wherein each reconstruction geometry is defined by an illumination incidence direction and a diffraction light emission direction with respect to one surface of the master body, and when reconstruction light is irradiated along the illumination incidence direction of the corresponding several different diffraction structures (1120, 1220,1320) this light in the diffraction direction (1140, 1240, 1340), wherein each of the several different diffraction structures under the respective associated reconstruction geometry (1160, 1260, 1360) reconstructs at least one path-connected area (1170, 1270, 1370) in the mathematical sense, having a uniform, homogeneous, non-zero diffraction efficiency, which can each be detected as a homogeneously luminous area (1170', 1270', 1370`). The invention further relates to the production of security elements, which preferably comprise personalized contact copies of the diffraction structures (1120, 1220, 1320) of the hologram master (1000), preferably designed as volume holograms (2100, 2200, 2300).