Coin Identification via Dog-Bone Effect Detection
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Solution Overview
Problem
Conventional coin processing devices struggle to accurately identify plated coins due to inconsistent plating thickness, making it difficult to distinguish genuine from forged coins.
Innovation Solution
The coin processing device employs identification sensors arranged on both sides of the coin passage, with a spiral coil configuration that utilizes high-frequency oscillations to detect the dog-bone effect, allowing for precise determination of coin genuineness by measuring the thickness of the plated layer at the coin's edge and center.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional identification sensors are used to detect plated coins, then the device can identify coins with basic functionality, but the measurement precision is insufficient due to inconsistent plating thickness
Solution Approach 1:
The patent divides the coin detection into multiple measurement points: the center portion and the peripheral portion of the coin are detected separately by the identification sensor. This segmentation allows the system to capture the thickness variation of the plated layer across different regions, enabling more precise measurement and reliable genuineness identification by comparing the thickness ratio between center and periphery.
2Loss of information
If the identification sensor detects the entire coin surface, then comprehensive data is obtained, but the device complexity increases
Solution Approach 1:
The patent extracts only the essential information needed for coin authentication by focusing detection on two specific regions: the center portion and the peripheral portion of the coin. Instead of detecting the entire coin surface, the system extracts the plated layer thickness from these key areas, reducing the complexity of sensor arrangement while maintaining sufficient information for accurate genuineness determination.
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 enables high-precision identification of plated coins by capturing the distinct voltage and frequency changes caused by the dog-bone effect, effectively differentiating between genuine and forged coins based on the thickness of the plated layer.
Implementation Method 1
The identification sensor is both coils connected to an oscillation circuit, and the identification sensor is oscillated at relatively high frequency (500 kHz, for example)
Implementation Method 2
the identification sensor 505 identifies a core material of the coin and the identification sensor 506 identifies a plated material of the coin surface layer
Data Source
Figure 1(a)~2
Figure 3(a)~4
Figure 5
AI summary
Provided is a coin identification device that can accurately identify coins that have been plated. An identification sensor (3) is arranged at a position in a wall surface of a coin passage (2) in which a coin (1) rolls, said position being passed by a part of the coin (1) where the plated layer is thick. The authenticity of the coin (1) can be detected by obtaining, from the output of the identification sensor (3), data including characteristics of both the core material and the plated layer of the coin (1).