Electrode Geometry for Electroluminescent Pigment Excitation
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Solution Overview
Problem
Existing document checking devices for value and security documents face challenges in reliably and efficiently exciting electroluminescent pigments with reduced maximum amplitude of alternating voltage, particularly in decentralized systems like small bill validators or ATMs, due to limitations in installation space and interference issues.
Innovation Solution
A document checking device with electrodes designed to concentrate electric field lines, achieving higher flux densities in specific areas, allowing for reliable excitation of electroluminescent pigments with reduced voltage amplitude, and minimizing interference and energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional electrodes with uniform field distribution are used, then the installation space can be larger, but the excitation reliability of electroluminescent pigments is insufficient and high voltage amplitude (30 kV) is required
Solution Approach 1:
The electrode is designed with non-uniform geometry (point electrode, edge configuration, or asymmetric shape) to create localized regions of high electric flux density. This concentrates the electric field where needed to reliably excite electroluminescent pigments without requiring high voltage across the entire electrode structure, thus improving excitation reliability while controlling device complexity.
Solution Approach 2:
The invention transitions from considering only the two-dimensional electrode surface area to incorporating the third dimension of field distribution in space. By designing electrodes that create concentrated field lines in specific spatial regions (point sources, edge effects), the patent achieves reliable excitation in targeted areas without proportionally increasing overall device size or complexity.
2Reliability
If high voltage amplitude (30 kV) is applied to bridge air gaps, then electroluminescent pigments can be excited, but plasma formation, voltage breakdown, and electromagnetic interference occur
Solution Approach 1:
By concentrating electric flux density in specific localized regions through specialized electrode geometry, the patent achieves sufficient field strength for reliable pigment excitation at lower overall voltage levels. This prevents the air gap breakdown and plasma formation that occur with conventional high-voltage (30 kV) uniform field distribution, while maintaining excitation reliability in the concentrated field regions.
Solution Approach 2:
The invention changes the spatial distribution parameter of electric flux density from uniform to non-uniform/concentrated. This parameter change allows the system to achieve the same excitation effect at lower voltage amplitudes, thereby reducing harmful effects like plasma formation and voltage breakdown that are voltage-threshold dependent.
3Reliability
If high voltage amplitude (30 kV) is used for excitation, then electroluminescent pigments can be reliably excited, but electromagnetic interference increases
Solution Approach 1:
The concentrated electrode design creates localized high-field regions that efficiently excite pigments without requiring system-wide high voltage. This reduces the overall electromagnetic field strength in the environment, minimizing electromagnetic interference while maintaining excitation reliability in the concentrated field zones through geometric field enhancement.
Solution Approach 2:
By changing the electric flux density distribution from uniform to concentrated, the patent reduces the total voltage amplitude needed (from 30 kV to lower levels). This parameter change directly reduces the strength of emitted electromagnetic radiation, thereby reducing interference while maintaining excitation effectiveness through field concentration.
4Adaptability or versatility
If decentralized authentication devices (small bill validators, ATMs) are implemented, then accessibility improves, but installation space becomes limited
Solution Approach 1:
The concentrated electrode design achieves efficient pigment excitation in localized regions, allowing the authentication device to be more compact. This enables decentralized applications (small validators, ATMs) to fit within limited installation spaces while maintaining reliable authentication capability through focused field concentration rather than requiring large uniform field areas.
Solution Approach 2:
The patent exploits spatial field concentration in three-dimensional space to achieve efficient excitation with compact electrode structures. This allows decentralized authentication devices to maintain functionality in reduced installation volumes by concentrating the electromagnetic interaction in specific spatial regions rather than requiring large planar electrode areas.
5Reliability
If conventional electrodes are used, then manufacturing is simpler, but excitation is less reliable and requires higher voltage
Solution Approach 1:
The patent employs electrode geometries (point electrodes, edge configurations, asymmetric shapes) that concentrate electric flux density in specific regions. While slightly more complex than uniform electrodes, these designs can be manufactured using standard techniques and achieve superior excitation reliability at lower voltages, offering a practical balance between manufacturing simplicity and performance.
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 enables targeted and reliable excitation of electroluminescent pigments with lower voltage amplitudes, reducing plasma formation, voltage breakdown, and electromagnetic interference, while maintaining strong excitation, thus improving the reliability and compactness of the device.
Implementation Method 1
an electrode (6) which is used to generate an electric field (7) and is designed in such a way that an electric flux density of the electric field (7) that can be generated by the electrode (6) in a predetermined emission direction changes
Implementation Method 2
for the contactless excitation of at least one electroluminescent pigment (19), in particular in a value or security document (2)
Data Source
Figure 1~2b
Figure 3~5
Figure 6~7
AI summary
The invention relates to a device for exciting at least one electroluminescent pigment, in particular in a value document or security document (2), without contact, wherein the device (1) comprises at least one electrode (6), wherein the at least one electrode (6) is designed in such a way that an electric flux density of the field (7) that can be generated by the electrode (6) in a predetermined emission direction (9) changes. The invention further relates to a method for contactless excitement.