Magnetic Property Determination for Paper Sheets
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Solution Overview
Problem
Conventional magnetic property determination apparatuses for paper sheets with multiple magnetic materials are cumbersome and costly due to the need for multiple magnets and sensors, leading to increased size and complexity.
Innovation Solution
A compact magnetic property determination apparatus that sets specific magnetic field intensities and directions to differentiate between high-coercive, middle-coercive, and low-coercive magnetic materials based on saturation magnetization states and waveform analysis, using a single magnetization magnet and bias magnetic field to determine the coercive force of each material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple magnets and magnetic sensors are used to determine different magnetic materials, then the determination accuracy is improved, but the device complexity and size increase
Solution Approach 1:
The patent combines multiple magnet functions into a single magnet that generates both the first magnetic field (for magnetizing high-coercive force material) and the second magnetic field (for magnetizing low-coercive force material). Similarly, multiple magnetic sensors are merged into a single sensor that detects magnetic fields from different materials at different time points, reducing the overall number of components while maintaining determination accuracy
Solution Approach 2:
The patent employs periodic action by sequentially applying different magnetic fields at different time points. The single magnet alternates between generating the first magnetic field to magnetize high-coercive force material and generating the second magnetic field to magnetize low-coercive force material. The single sensor periodically detects magnetic signals corresponding to different materials at these different time points, enabling differentiation without requiring multiple simultaneous sensors
2Measurement precision
If multiple magnets and magnetic sensors are used to determine different magnetic materials, then the determination accuracy is improved, but the apparatus cost increases
Solution Approach 1:
The patent reduces manufacturing cost by merging multiple expensive components (multiple magnets and multiple magnetic sensors) into fewer components (one magnet and one magnetic sensor). This consolidation maintains the capability to determine different magnetic materials while significantly reducing the overall apparatus cost
Solution Approach 2:
The single magnet is designed with multi-functionality to generate different magnetic fields (first and second magnetic fields) for detecting different types of magnetic materials. Similarly, the single magnetic sensor serves multiple detection purposes by detecting magnetic fields from both high-coercive force and low-coercive force materials at different time points, reducing the need for specialized components for each material type
3Adaptability or versatility
If multiple magnets are used with different magnetic forces, then the detection capability for different coercive forces is improved, but the overall structure becomes complicated
Solution Approach 1:
The patent employs dynamics by making the magnetic field generation dynamic rather than static. A single magnet dynamically switches between generating different magnetic field strengths (first magnetic field for high-coercive force material, second magnetic field for low-coercive force material) based on the detection needs. This dynamic approach replaces the need for multiple static magnets with different fixed magnetic forces, simplifying the overall structure while maintaining versatility
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
Enables accurate differentiation and determination of multiple magnetic materials with reduced apparatus size and cost by controlling magnetization directions and field intensities, resulting in distinct detection signals for each material type.
Implementation Method 1
a magnetization magnet 20 that generates a magnetization magnetic field
Implementation Method 2
the magnetic field intensity of the magnetization magnetic field is set to the magnetic field intensity for magnetizing the high-coercive force magnetic material into a saturation magnetization state
Implementation Method 3
a bias magnet 30 that generates a bias magnetic field
Implementation Method 4
a magnetic sensor 10 that detects the magnetic material included in the paper sheet
Implementation Method 5
the magnetized paper sheet is transported through a transport path in a transport direction
Data Source
Figure 1A~1B
Figure 2
Figure 3A~3D
AI summary
A magnetic property determination apparatus that detects a magnetic property of each magnetic material included in a paper sheet transported through a transport path and determines the magnetic materials. The magnetic property determination apparatus includes a magnetic detection unit that generates on the transport path a bias magnetic field having a magnetic field direction inclined to a transport surface of the paper sheet by a specific angle and detects the magnetic charge of the magnetic materials by detecting variation of the bias magnetic field; and a magnetization unit that is arranged upstream of the magnetic detection unit in the transport direction and magnetizes the magnetic materials by generating on the transport path a magnetization magnetic field having a magnetic field direction oriented in a direction different from the direction of the bias magnetic field. At a position at which the magnetic detection unit detects the magnetism, the magnetic materials are in a state in which the magnetic materials are magnetized in mutually different magnetization directions according to coercive force thereof.