Security Composite Body with Aligned Refractive Structures
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Solution Overview
Problem
Existing security composite bodies lack features that are difficult to produce and manipulate, allowing for potential counterfeiting and falsification, with limited capability for full-color information storage and insufficient alignment of optical structures during production.
Innovation Solution
A security composite body with a refractive optical structure on the surface and an additional light-refracting structure inside, formed from transparent plastic materials with different refractive indices, creating a relief structure at the interface that refracts light differently depending on the angle of incidence, enhancing optical effects and security against delamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single optical structure is formed on the surface of the document body, then the security feature can be produced with simpler manufacturing processes, but the optical effect and security against counterfeiting is limited
Solution Approach 1:
The patent implements nesting by placing a first optical structure on the front surface of the document body and a second optical structure on the rear surface, where the second structure is optically coupled to the first through the document body layers. This nested arrangement creates complex optical effects that require precise alignment, significantly increasing security against counterfeiting while maintaining manageable manufacturing complexity through modular production.
2Reliability
If multiple layers are combined to create complex optical structures, then security against manipulation is improved, but the alignment precision and manufacturing complexity increases
Solution Approach 1:
The patent applies preliminary action by forming the first optical structure on the front surface and the second optical structure on the rear surface during separate manufacturing steps before final assembly. The structures are pre-positioned with registration features that ensure precise alignment when layers are combined, reducing the actual alignment precision required during final assembly while maintaining high overall alignment accuracy.
3Manufacturing precision
If conventional embossing methods are used to create optical structures, then the manufacturing process is simpler, but the resolution and detail of the optical features is insufficient
Solution Approach 1:
The patent replaces conventional mechanical embossing methods with direct laser writing technology for creating the optical structures. This substitution enables high-resolution features with precise control over geometry and dimensions, achieving superior optical feature resolution while maintaining manufacturing simplicity through a single-step direct writing process that eliminates the need for complex embossing tooling.
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 combined optical structures provide enhanced security against manipulation and counterfeiting, ensuring precise alignment and complex optical effects that are difficult to replicate, thus increasing the security and durability of the composite body.
Implementation Method 1
a boundary layer relief structure that deviates from a planar surface and is aligned in register with the optically verifiable feature and the surface relief structure, so that a verification of the optically verifiable feature by means of a combination the surface relief structure and the boundary layer relief structure formed optical structure is possible
Data Source
Figure 1a~1d
Figure 1e
Figure 1f~1g
AI summary
The invention relates to a security composite body (100) and a method for producing such a security composite body (100), said method comprising the following steps: producing a composite body, forming a surface relief structure (75) on an outer surface of the composite body, introducing an optically verifiable feature (61) into the composite body, wherein the surface relief structure (75) and the feature are formed in exact alignment with each other, wherein the composite body is produced in such a way that, in the interior, a boundary layer between a first plastic material having a first index of refraction n1 and a second plastic material (11) having a second index of refraction n2 different from the first index of refraction n1 is structured with a boundary layer relief structure (5) deviating from a flat surface and is oriented in exact alignment with the feature and the surface relief structure (75), so that a verification of the feature (61) can be verified by means of an optical structure formed from a combination of the surface relief structure (75) and the boundary layer relief structure (5).