Track-Shaped Air Core Coils for Uniform Coin Detection
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Solution Overview
Problem
Coin detection systems with air core coils suffer from varying sensitivity depending on coin position, limiting their ability to detect coins in a wide range effectively.
Innovation Solution
A coin detection antenna with multiple track-shaped air core coils disposed along the short-side directions of air cores ensures that the smallest coin crosses at least one centerline within the detection range, reducing sensitivity variations and minimizing structural complexity and size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a single air core coil is used for coin detection, then the detection range is limited, but using multiple air core coils increases sensitivity variations and structural complexity
Solution Approach 1:
The single air core coil is divided into multiple track-shaped air core coils arranged in the short-side direction. Each segment covers a specific detection zone, and their combined coverage achieves wide-range detection while maintaining uniform sensitivity through the track shape design that ensures coins cross centerlines.
2Area of stationary object
If multiple air core coils are arranged to expand detection range, then the detection range increases, but the device complexity and substrate size increase
Solution Approach 1:
Multiple track-shaped air core coils are merged onto a single substrate in the short-side direction, sharing common wiring patterns and structural support. This integration achieves wide detection range while minimizing structural complexity compared to separate coil assemblies.
Solution Approach 2:
The air core coils are arranged in the short-side direction (one dimension) rather than expanding in all directions. This directional arrangement efficiently expands detection range along a specific axis while minimizing overall substrate area and structural complexity.
3Area of stationary object
If air core coils are arranged to cover wide area, then detection range increases, but dead space increases and substrate size increases
Solution Approach 1:
The track shape of air core coils creates regions of high sensitivity along the centerlines where coins are detected. By concentrating magnetic field strength in these specific local areas along the short-side direction, the design achieves wide detection range coverage while minimizing dead space and reducing overall substrate size.
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 allows for wide-range coin detection with reduced sensitivity variations, requiring only one substrate and minimizing dead space, resulting in a more efficient and compact coin detection system.
Implementation Method 1
a coin detection antenna provided at a location corresponding to the coin retaining unit, and includes a substrate and a plurality of air core coils of track shape including a wiring pattern provided on the substrate
Data Source
AI summary
A coin detection antenna includes a substrate and a plurality of air core coils of track shape including a wiring pattern provided on the substrate. The plurality of air core coils is disposed along short-side directions of air cores of the plurality of air core coils such that a smallest coin of coins to be detected crosses at least one of centerlines of the air cores even when the smallest coin is located at any location in a detection range.