Hologram Layer Defect Generation via Pulsed Light for Security Documents
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Solution Overview
Problem
Current security elements for documents lack enhanced security features to prevent forgery and ensure personalization effectively, as they rely on conventional holograms that can be replicated or tampered with.
Innovation Solution
Introducing a method to create a security element with a hologram layer that includes visible defects generated by pulsed light beams, allowing for personalized and machine-readable information storage, enhancing security by making the hologram locally disturbed and imperfections visible at specific viewing angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional holograms are used in security elements, then the security document can be produced with standard security features, but the security element can be replicated or tampered with, reducing security effectiveness
Solution Approach 1:
The patent applies local quality by introducing defects at specific locations within the hologram layer. These defects are not uniformly distributed but are strategically placed to create unique identification patterns. The defects locally alter the hologram's optical properties, creating regions with different light scattering, absorption, or reflection characteristics that are visible at specific viewing angles, thereby preventing replication while maintaining overall hologram functionality
Solution Approach 2:
The patent employs asymmetry by creating non-uniform defect patterns within the hologram layer. The defects are intentionally asymmetric in their distribution, shape, and optical properties, making each security element unique. This asymmetric defect structure ensures that even if a hologram is replicated, the specific asymmetric defect pattern cannot be exactly reproduced, providing a reliable anti-counterfeiting mechanism
Solution Approach 3:
The patent utilizes parameter changes by modifying the optical parameters of the hologram layer through defect introduction. The defects change local parameters such as light scattering coefficient, absorption coefficient, and refractive index within the hologram layer. These parameter changes create visible disturbances at specific viewing angles that are characteristic of the original security element and cannot be replicated by standard copying methods
2Shape
If the hologram layer is made fully transparent and uniform, then the aesthetic quality is improved, but security features are reduced due to lack of visible verification elements
Solution Approach 1:
The patent maintains overall aesthetic quality by keeping the majority of the hologram layer transparent and uniform, while introducing localized defects that serve security functions. These defects are confined to specific regions and do not compromise the overall visual appeal of the security element. The local defects create visible verification features only when viewed at specific angles, thus maintaining aesthetics while enabling security verification
Solution Approach 2:
The patent applies partial action by introducing defects only in specific regions of the hologram layer rather than making the entire layer non-uniform. This partial defect introduction is sufficient to provide security verification capabilities while preserving the aesthetic quality of the remaining transparent and uniform portions of the hologram layer. The defects are minimal in number and distribution but maximal in their security verification function
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 provides an additional security feature by making the hologram partially removable or altered, creating unique, irreversible defects that support anti-counterfeiting and personalization, enhancing the security and authenticity of documents like ID cards and passports.
Implementation Method 1
the produced hologram is locally disturbed by irradiation of pulsed light beams
Implementation Method 2
light of several different colors is generated, the light is individually spatially modulated, separated by color, the modulated light is guided optically in such a way that the light is at least partially diffracted and/or reflected on a holographic master
Implementation Method 3
the produced hologram is locally disturbed by irradiation of pulsed light beams and the defects being visible
Data Source
AI summary
The invention relates to a method for producing a security element for a security document, comprising the following steps: providing a hologram layer (6); producing a hologram in the hologram layer (6), wherein light is shone onto the hologram layer (6) and the produced hologram is visible when viewing the hologram layer (6) at a certain angle; and creating defects (9) in the hologram, wherein the hologram in the hologram layer (6) is locally disrupted by shining pulsed light beams onto it and the defects (9) are visible when viewing the hologram layer (6) at a certain angle. Furthermore, a method for producing a security document with a security element, a method for personalizing a security document, an ID document, and a security element for a security document are provided.