Security Transfer Element Underside Luminescence Detection
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Solution Overview
Problem
Existing security transfer elements for documents of value face challenges in reliably authenticating the presence and completeness of security elements due to environmental influences and the difficulty in detecting luminescent substances from the top side, which can be tampered with during counterfeiting.
Innovation Solution
A security transfer element with a layered composite structure featuring an optically variable functional layer and a luminescent substance in the adhesive layer, where the luminescent substance emits radiation in a wavelength range between 700 nm and 2100 nm, is designed to be excited from the underside, preventing emission through the functional layer to the top side, allowing detection only from the underside, enhancing authenticity and integrity checks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If luminescent material is placed in the adhesive layer of security transfer elements, then authentication capability is improved, but detection reliability deteriorates due to environmental influences and difficulty in detecting from top side
Solution Approach 1:
The patent inverts the conventional detection approach by placing the luminescent material in the adhesive layer and detecting luminescence from the underside of the document rather than the top side. This inversion makes it difficult for counterfeiters to tamper with or detect the luminescent material during counterfeiting, while enabling reliable authentication through underside detection that is insensitive to environmental influences affecting top-side detection.
2Reliability
If security transfer elements are applied to valuable documents, then security protection is improved, but vulnerability to counterfeiting increases due to inability to verify completeness
Solution Approach 1:
The patent implements a feedback mechanism where the luminescent material in the adhesive layer provides detectable luminescence from the underside of the document. This feedback enables verification of the security transfer element's completeness and proper application, as any tampering or incomplete application would result in abnormal luminescence patterns that can be detected during authentication.
3Reliability
If luminescent material is used in security transfer elements, then anti-counterfeiting capability is improved, but ease of operation deteriorates due to complex detection requirements
Solution Approach 1:
The patent employs a self-service approach where the luminescent material in the adhesive layer automatically provides authentication information through its luminescence properties when excited. The underside detection method allows the security feature to serve itself for authentication without requiring complex external verification systems, as the luminescence pattern directly indicates the presence and completeness of the security transfer element.
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 enables reliable authentication and integrity verification of security elements by ensuring that luminescent radiation is detectable only from the underside, making it difficult for counterfeiters to recognize and replicate, thus providing enhanced security against forgery.
Implementation Method 1
The security element layer composite comprises at least one luminescent material which, upon excitation, emits primary radiation in a wavelength range between 700 nm and 2100 nm
Implementation Method 2
The functional layer is opaque with respect to the emission radiation of the luminescent material
Data Source
Figure 1a~1b
Figure 2a~2d
Figure 3a~3b
AI summary
The invention relates to a security transfer element (20), a valuable document, comprising a security element layer composite (200), a method for testing a valuable document, a test unit, a valuable document processing device, and a system comprising test unit and/or valuable document processing device and security transfer element and/or valuable document. The security transfer element comprises a security element layer composite having a functional layer, wherein the functional layer manifests an optically variable effect for an observer. On the opposite side of the functional layer with respect to the observer, the security element layer composite comprises at least one luminescent substance. The luminescent substance has a primary emission wavelength in a wavelength range of between 700 nm and 2100 nm and is excitable by an excitation radiation in the wavelength range of between 400 nm and 2100 nm. Furthermore, the functional layer is embodied such that it is opaque to the emission radiation of the luminescent substance. The security transfer element comprises a carrier film (21). The security element layer composite is arranged on the carrier film in a releasable manner. The security element layer composite 200 comprises a functional layer (210) and an adhesive layer (220). The functional layer comprises an embossing lacquer (211) having an embossing structure (212). The embossing lacquer is coated with a metallization (213). The adhesive layer comprises a plurality of luminescent substances. The functional layer can also comprise transparent high refractive index layers, thin-film elements having a color tilt effect, or layers composed of liquid-crystalline material.