Security Device Registration via Pattern Defining Substance
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Solution Overview
Problem
Current security devices with optically variable effect generating relief structures, such as holograms and diffraction gratings, lack a high degree of registration and security level, making them susceptible to counterfeiting, especially when viewed from both sides of a document.
Innovation Solution
A security device is created using a pattern defining substance that impedes the retention of subsequent layers, ensuring the formable material and reflection enhancing material are precisely registered, with the formable material appearing different when viewed from each side due to its optical properties and the reflection enhancing material, enhancing the difficulty of imitation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a security device with optically variable effect generating relief structure is provided on a transfer foil and hot stamped onto the document substrate, then the security device can be applied to documents of value, but the device lacks a high degree of registration and security level, making it susceptible to counterfeiting
Solution Approach 1:
The patent applies a pattern defining substance (such as a soluble mask or etch resist) to the substrate before forming the relief structure and applying reflection enhancing material. This preliminary pattern definition ensures precise registration boundaries are established in advance, allowing subsequent layers to be accurately positioned and preventing counterfeiting through improved manufacturing precision
Solution Approach 2:
The pattern defining substance acts as an intermediary layer between the substrate and the formable material/reflection enhancing material. This intermediary controls the deposition and retention of subsequent layers, ensuring they are retained only in specific patterned regions, thereby achieving high registration precision and enhanced security
2Reliability
If the security device is viewed from both sides of the document, then the device can be viewed from both sides to increase the difficulty of counterfeiting, but the appearance lacks differentiation between sides reducing security
Solution Approach 1:
The patent creates different local qualities on opposite sides of the security device by selectively retaining formable material and reflection enhancing material in specific regions. One side exhibits an optically variable effect (such as holographic or diffraction patterns) while the other side shows a different appearance (such as a reflective or colored pattern), making counterfeiting more difficult while maintaining viewability from both sides
Solution Approach 2:
The formable material contains optically effective substances that impart different appearances when viewed from opposite sides. The material may change color or optical properties based on the viewing angle and lighting conditions, creating differentiated visual effects on each side of the device that enhance security through optical variability
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 solution achieves a high degree of registration and security by presenting two different yet precisely registered visual effects from each side of the device, significantly increasing the complexity and difficulty of counterfeiting.
Implementation Method 1
the appearance of the optically variable effect appears different, being due to the reflection enhancing material
Implementation Method 2
When viewed through the first layer, the appearance of the optically variable effect is dictated by the appearance of the formable material
Data Source
Figure 1~2
Figure 3~4
Figure 5a~5d
AI summary
A method of manufacturing a security device, comprises the following steps: (a) providing a first layer comprising at least a partially translucent or transparent region; (b) applying pattern defining substance on a surface of the first transparent layer, excluding at least one first region on the surface of the first layer aligned with the at least a partially translucent or transparent region; (c) applying a formable material to a second region of the first surface, wherein the second region overlaps at least part of the at least one first region, the overlapping portions of the first and second regions respectively defining at least one third region; then performing the steps (d) and (e) in any order: (d) forming the formable material in the at least one third region such that its surface distal from the first layer follows the contours of a first optically variable effect generating relief structure in the at least one first region; and (e) applying a first reflection enhancing material over the formable material to form a reflection enhancing layer which follows the contour of the relief structure; wherein the pattern defining substance impedes the retention, in areas to which the pattern defining substance was applied, of the formable material and any overlaying reflection enhancing material.