Luminescent Particle Plating for Coin Security
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Solution Overview
Problem
The challenge lies in incorporating effective security features into coins that prevent counterfeiting without compromising the quality of the coin's finish or structural integrity, while maintaining economic viability and durability throughout commercial circulation.
Innovation Solution
A method involving a plating solution with luminescent particles of 10 μm or less is used to create a metallic layer on articles, such as coins, where the particles are homogeneously dispersed within the layer, and the solution may undergo ultrasound treatment to ensure stable suspension and reduced particle-free layer depth, allowing for a strong electromagnetic signal without affecting the coin's quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If luminescent particles are incorporated into the plated layer to provide security features, then security detection capability is improved, but the quality of the coin's finish and structural integrity may deteriorate
Solution Approach 1:
The patent applies parameter changes by controlling the size of luminescent particles to be 10 μm or less, and optimizing their concentration in the plating solution. This allows the particles to be small enough not to disrupt the coin's surface finish quality while still providing sufficient luminescent signal for security detection. The parameter optimization resolves the contradiction between security functionality and aesthetic quality.
Solution Approach 2:
The patent implements local quality by ensuring luminescent particles are homogeneously dispersed throughout the plated layer rather than concentrated in specific areas. This uniform distribution ensures that security detection capability is maintained across the entire coin surface while preventing localized defects that could compromise the overall finish quality or structural integrity.
2Reliability
If luminescent particles are dispersed homogeneously in the plated layer, then security detection consistency is improved, but the complexity of the plating process increases
Solution Approach 1:
The patent employs ultrasonic treatment of the plating solution before and/or during the plating process. This mechanical vibration method effectively disperses luminescent particles uniformly throughout the solution and prevents agglomeration, achieving homogeneous distribution in the plated layer. This approach provides a relatively simple and effective means to ensure signal consistency without requiring complex multi-step processes.
3Manufacturing precision
If smaller luminescent particles are used to maintain surface quality, then the quality of finish is improved, but the electromagnetic signal strength may decrease
Solution Approach 1:
The patent applies the copying principle by using multiple small luminescent particles (each 10 μm or less) distributed throughout the plated layer to collectively generate the required electromagnetic signal. Instead of relying on a single large particle that would compromise surface quality, numerous small particles work together to provide sufficient signal strength for security detection while maintaining the coin's aesthetic finish.
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 approach provides a secure, durable, and cost-effective means to detect counterfeits by maintaining the coin's quality and ensuring consistent luminescent signals throughout its lifespan.
Implementation Method 1
plating (e.g., electroplating or electroless plating) metals of higher value onto the coin blank
Implementation Method 2
the plating solution is subjected to an ultrasound (also referred to as 'ultrasonic' herein) treatment
Data Source
AI summary
The present invention relates to the field of plating, including, but not limited to electroplating metallic articles, for example metallic discs that can be used as, or converted into, coins. Embodiments of the present invention described herein incorporate luminescent particles into plated metallic layers so that they can be detected for security purposes.