Magnetic Pattern Detection Device Using Dual Field Strengths
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Solution Overview
Problem
Existing magnetic pattern detection devices face challenges in accurately discriminating between different types of magnetic inks on paper money and securities due to variations in residual magnetic flux density and permeability, leading to difficulties in determining the authenticity and type of magnetic ink, especially when using a single device for multiple types of media.
Innovation Solution
A magnetic pattern detection device that utilizes a common sensor part to detect both residual magnetic flux density and permeability levels, with a signal processing section extracting specific signals for each property, allowing for accurate discrimination of magnetic patterns and types, and includes a feeding mechanism for continuous detection while simplifying the structure and reducing measurement errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single detection device is used for multiple types of magnetic patterns with different residual magnetic flux densities and permeabilities, then device complexity is reduced, but measurement precision deteriorates because the output levels vary and it becomes difficult to determine the type of magnetic ink
Solution Approach 1:
The patent applies parameter changes by varying the detection conditions - specifically changing the magnetic field strength applied during detection. By using multiple magnetic field strengths (first and second magnetic fields with different strengths), the device can distinguish between different types of magnetic patterns that would otherwise produce overlapping signals at a single detection condition. This allows one device to accurately identify different magnetic ink types by observing how their magnetic properties respond to different field strengths.
2Measurement precision
If multiple detection devices are provided to measure both permeability and residual magnetic flux density, then measurement precision is improved, but device complexity and cost increase due to requiring two mechanically stable traveling portions
Solution Approach 1:
The patent implements universality by designing a single detection device that can perform multiple measurement functions. The same detection device measures both permeability and residual magnetic flux density by utilizing the magnetic field strength variation technique. This eliminates the need for separate devices for each measurement, thereby reducing mechanical structure complexity while maintaining comprehensive measurement capability.
Solution Approach 2:
The patent merges the functions of multiple detection devices into one unified device. By combining the measurement of permeability and residual magnetic flux density into a single device that processes signals from both magnetic field applications, the patent reduces the overall system complexity. The signal processing unit integrates the analysis of both measurement types, eliminating the need for separate mechanical traveling portions for each detection function.
3Adaptability or versatility
If detection is performed on magnetic patterns with low concentration or weak magnetic properties, then adaptability is improved, but measurement precision deteriorates because output levels become extremely low and difficult to determine
Solution Approach 1:
The patent applies parameter changes by adjusting the magnetic field strength parameter to optimize detection sensitivity. By applying a first magnetic field of a certain strength and then a second magnetic field of different strength, the device can enhance the output signal from weak magnetic patterns. The variation in signal response between the two field strengths allows for accurate detection even when the absolute signal level is low, thereby maintaining measurement precision across a wide range of magnetic ink concentrations and types.
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 reliable detection of magnetic patterns and types with high accuracy using a simple structure, eliminating the need for multiple detection devices and reducing costs, while improving sensitivity and reducing measurement errors through efficient magnetic field application and sensor design.
Implementation Method 1
a sensor part for detecting magnetism from the medium through a magnetic flux detecting part
Implementation Method 2
a magnetic field application part for applying a magnetic field to the medium
Data Source
AI summary
A magnetic pattern detection device for use with a medium having at least one magnetic pattern of a plurality of types of magnetic patterns whose residual magnetic flux density and permeability are different on a basis of both of a level of residual magnetic flux density and a level of permeability may include a common sensor part structured to detect presence/absence of each of the plurality of types of magnetic patterns, and a signal processing section structured to extract a first signal corresponding to the level of the residual magnetic flux density and a second signal corresponding to the level of the permeability from a signal outputted from the sensor part.