Magnetic Detection Device for Bicolor Coin Recognition
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Solution Overview
Problem
Conventional coin recognition units require complex configurations and struggle to accurately detect fine portions of bicolor coins due to the need for multiple magnetic sensors and intricate timing coordination during transportation.
Innovation Solution
A magnetic detection apparatus featuring an excitation coil generating an AC magnetic field and a series of detecting coils disposed at specific pitches, which output detection signals based on induced voltage changes as the coin passes, allowing for stable detection of fine portions without the need for complex sensor arrangements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple magnetic sensors are disposed for respective constituent members of bicolor coin, then detection of bicolor coin structure is enabled, but device complexity increases and fine portion detection becomes difficult
Solution Approach 1:
The detection system is segmented into multiple detecting coils arranged in a specific pattern (e.g., four coils at corners or two coils on opposite sides) of the transport path. Each coil detects magnetic field changes independently, and the control unit processes signals from multiple coils to identify bicolor coin structures by comparing detection patterns across different spatial positions, thereby achieving precise detection without complex sensor arrangements
Solution Approach 2:
The invention transitions from a single-point detection approach to a multi-point spatial detection approach by arranging multiple detecting coils at different positions around the transport path. This spatial distribution allows the system to detect magnetic field changes at multiple locations simultaneously, enabling identification of bicolor coin structures through comparative analysis of signals from different spatial dimensions
2Measurement precision
If bicolor coin is transported to one side on the transport path for detection, then bicolor coin detection is performed by matching timing of signals, but device complexity increases and fine portion detection becomes difficult
Solution Approach 1:
The detecting coils are pre-positioned at specific locations around the transport path before coin detection begins. The control unit is pre-configured with the spatial relationships between coil positions and coin features, allowing it to automatically correlate detection signals from different coils based on their known spatial arrangement and the coin's transport trajectory, eliminating the need for complex real-time timing adjustments
Solution Approach 2:
The control unit continuously monitors detection signals from multiple coils and uses feedback from the transport mechanism's position information to dynamically adjust detection timing and coordinate signals from different coils. This feedback loop enables automatic synchronization of multi-coil detection data based on the actual position of the coin on the transport path, simplifying the overall system control
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 configuration simplifies the detection process while enabling stable recognition of fine coin features, eliminating the need for intricate timing adjustments and complex sensor placements.
Implementation Method 1
an excitation coil to which an AC voltage is applied, generates an AC magnetic field in a transport path
Implementation Method 2
a plurality of detecting coils which respectively output detection signals based on an induced voltage by the AC magnetic field
Data Source
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AI summary
Provided is a magnetic detection device (100) having a simple configuration and being capable of stably detecting fine portions of a coin. The magnetic detection device (100) comprises an excitation coil (LX) that generates an alternating magnetic field in a transport path for transporting a coin in a first direction, and a plurality of detection coils (L1, L2) that are arranged at a predetermined pitch in a second direction and that output a detection signal based on an induction voltage caused by the alternating magnetic field. Each of the plurality of detection coils (L1, L2) outputs a detection signal on the basis of the induction voltage induced by the alternating magnetic field, which changes due to the coin being transported along the transportation path.