Planar Security Element Embossing for Distinct Optical Effects
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Solution Overview
Problem
Existing optically variable security elements face limitations in visual effects due to the need to view lower relief structures through higher embossed lacquer layers, restricting color choices and creating undesirable visual effects.
Innovation Solution
The development of an optically variable security element with first and second feature areas arranged in a common plane, utilizing embossing lacquers with different hardening properties and optical effects, such as thermoplastic and radiation-curing lacquers, to create precise and distinct optical effects without interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If multiple embossed lacquer layers are stacked at different heights, then relief structure is achieved, but the lower relief structure cannot be viewed directly and color choices are restricted
Solution Approach 1:
The patent transitions from vertical stacking of embossed lacquer layers at different heights to a planar arrangement where multiple feature areas with different colored embossed lacquers are positioned side-by-side in the same plane. This dimensional change from 3D stacking to 2D arrangement allows direct viewing of all relief structures without interference, freeing color selection while maintaining relief effects.
2Illumination intensity
If embossed lacquer layers are arranged at different heights, then optical variation is achieved, but visual interference occurs when viewing lower structures
Solution Approach 1:
The patent divides the security element into multiple feature areas, each containing embossed lacquer with distinct colors and embossed structures. By segmenting the design into separate planar zones rather than overlapping vertical layers, each feature area's optical effects are independently viewable without interference from other structures.
3Ease of operation
If feature areas are arranged in a common plane with precise alignment, then direct viewing of all structures is enabled, but manufacturing precision requirements increase
Solution Approach 1:
The patent introduces a common embossing layer as an intermediary substrate that receives embossed structures from multiple feature areas in a single embossing operation. This mediator layer facilitates precise alignment of multiple feature areas in the common plane while simplifying the manufacturing process, as the embossing structures are transferred simultaneously rather than requiring multiple sequential steps with high alignment precision.
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 provides a security element with enhanced visual appeal and high counterfeit protection by allowing precise alignment and distinct optical effects, including color and luminescence, while maintaining structural integrity and ease of manufacturing.
Implementation Method 1
physical drying for thermoplastic embossing lacquers
Implementation Method 2
radiation curing for radiation-curing lacquers
Implementation Method 3
creating a first optical effect
Implementation Method 4
creating a second, different optical effect
Data Source
Figure 1~2
Figure 3(a)~3(d)
Figure 4(a)~4(d)
AI summary
The invention relates to an optically variable security element (20) for safeguarding articles of value. The security element has a feature layer (24) containing, in a common plane, first and second feature regions (30, 40) arranged so as to accurately fit together. The first feature regions (30) contain a first embossing lacquer layer of a first embossing lacquer (32) into which an embossed structure (34) that creates a first optical effect has been embossed. The second feature regions (40) contain a second embossing lacquer layer of a second embossing lacquer (42) into which an embossed structure (44) that creates a second, different optical effect has been embossed. The first and second embossing lacquers (32, 42) have different solidification properties and different optical properties. The invention also relates to a production process for such an optically variable security element, and to embossing arrangements comprising a semifinished security element product and means of impressing an embossed structure.