Magnetic Image Coating on Transparent Substrate for 3D Security
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Solution Overview
Problem
Existing security elements for value and ID documents cannot be easily authenticated by the unaided eye, as they are typically viewable only from one side, lacking a recto-verso functionality.
Innovation Solution
An angle-dependent image on a transparent substrate is created using magnetically orientable pigments, which change appearance when viewed from the recto or verso side, producing a 3D effect in positive or negative relief, achieved by applying and curing a magnetic image coating on the substrate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a magnetic image coating is applied to a substrate for security authentication, then the visual appearance and 3D effect are improved, but the coating can be viewed only from a single side, limiting authentication convenience
Solution Approach 1:
The patent applies a magnetic image coating on both the front and back sides of the transparent substrate. When viewed from the front, the coating displays a positive relief 3D effect, while when viewed from the back, it displays a negative relief 3D effect. This bidirectional application allows authentication from either side of the document, resolving the contradiction between reliable visual authentication and ease of operation.
2Reliability
If optically variable inks are used for copy protection, then security against counterfeiting is improved, but specialized equipment or conditions are required for verification, reducing usability for general users
Solution Approach 1:
The patent employs optically variable inks containing interference pigments that change color and display 3D relief effects when viewed from different angles. This allows users to verify authenticity simply by tilting the document or viewing it from different perspectives, eliminating the need for specialized equipment while maintaining high copy protection effectiveness.
3Reliability
If magnetic orientation of pigment flakes is applied to create 3D relief effect, then visual security feature is improved, but the effect cannot be observed from both recto and verso sides
Solution Approach 1:
The patent applies magnetic image coating on both sides of the transparent substrate with specific orientation arrangements. The front side coating creates a positive relief 3D effect when viewed from the front, while the back side coating creates a negative relief 3D effect when viewed from the back. This enables the security feature to be observed and authenticated from either recto or verso side of the document.
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 allows for rapid and simple authentication of documents by observing the inversion of the image when turning the document, enhancing security and usability for the 'man on the street' without requiring specialized tools, and can be combined with other security features like color-shifting elements.
Implementation Method 1
an angle-dependent image on a transparent substrate, preferably showing a 3-dimensional effect, in positive or negative relief, if observed from the recto- or verso side, respectively
Implementation Method 2
the optically variable inks (OVI®) comprise optically variable pigments (OVPTM); preferred types being the flake shaped thin-film optical interference pigments
Data Source
Figure 1a~1b
Figure 2a~2b
Figure 3a~3b
AI summary
The present invention discloses a security element comprising a transparent substrate and a magnetically oriented image coating on said substrate, wherein said image coating is preferably laid out such as to show a 3-dimensional effect, appearing in positive or negative relief respectively, if observed form the recto- or the verso side, respectively. The security element can be easily identified by the unaided eye, by just turning around the document and observing the angle-dependent image on either side. On the other hand, the security element cannot be reproduced by scanning or copying the document.