Magnetic Detection Apparatus Calibration via Plate Excitation

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Solution Overview

Problem

Conventional magnetic detection apparatuses face challenges in achieving high accuracy calibration of magnetic sensors when they are out of position, and securing space for calibration magnetic field generation hinders downsizing and increases detection error due to longer sensor-to-paper distances.

Innovation Solution

A magnetic detection apparatus with orthogonal arrangement of sensors and a rectangular plate-shaped excitation member that generates a calibration magnetic field, allowing for sensitivity correction and serving as both the calibration source and cover, enabling precise calibration and downsizing by eliminating the need for additional space for the excitation member.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If a conventional linear conductor is used for calibration, then the apparatus can generate a calibration magnetic field, but the calibration accuracy decreases when magnetic sensors are out of position

Engineering Contradiction:

Improvecalibration accuracyVSAvoidcalibration consistency

Core Design Contradiction:

Measurement precisionVSReliability

Solution Approach 1:

The conventional linear conductor is segmented into multiple conductors arranged in a matrix pattern. This segmentation creates multiple discrete calibration points that can independently calibrate each magnetic sensor position, ensuring consistent calibration accuracy regardless of sensor positioning variations.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

A non-magnetic support structure is introduced as an intermediary to hold the conductors in precise fixed positions. This support structure acts as a mediator that maintains the geometric relationships between conductors and sensors, enabling accurate calibration even when sensors are slightly out of position.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Measurement precision

If space is secured for a separate excitation member, then calibration can be performed, but the apparatus size increases

Engineering Contradiction:

Improvecalibration capabilityVSAvoidapparatus size

Core Design Contradiction:

Measurement precisionVSVolume of moving object

Solution Approach 1:

The excitation member (conductors) is merged with the sensor array structure itself. The conductors are integrated into the same support framework as the magnetic sensors, eliminating the need for a separate excitation member and reducing the overall apparatus volume while maintaining calibration functionality.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The support structure serves multiple functions: it holds both the magnetic sensors and the calibration conductors, providing mechanical support for the entire detection apparatus. This multi-functionality eliminates the need for separate structural components, enabling downsizing.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Volume of moving object

If the distance between magnetic sensors and paper sheet is increased to secure space, then the apparatus can accommodate calibration components, but detection accuracy decreases

Engineering Contradiction:

Improveapparatus internal spaceVSAvoidmagnetic detection accuracy

Core Design Contradiction:

Volume of moving objectVSMeasurement precision

Solution Approach 1:

The calibration conductors are arranged in a matrix pattern that extends in dimensions orthogonal to the sensor-to-paper distance. This allows the calibration field to be generated in a different spatial dimension, enabling calibration functionality without increasing the critical distance between sensors and paper sheet.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

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 high-accuracy calibration of magnetic sensors, improving detection resolution and reducing errors by ensuring consistent magnetic field direction and intensity across all sensors, while enabling a more compact design.

Implementation Method 1

a control unit that generates a calibration magnetic field by passing an electric current in the arrangement direction through the excitation member

Methodology Applied

Scientific EffectElectromagnetic induction: Electromagnetic Induction

Implementation Method 2

obtains a correction value for correcting variation in sensitivity of the plurality of magnetic sensors based on detection results of the calibration magnetic field detected by the magnetic sensors

Methodology Applied

Scientific EffectMagnetic field detection: Magnetic Field

Data Source

PatentUS10775470B2Magnetic detection apparatus

Publication Date: 2020.09.15 GLORY LTD

AI summary

One object is to correct with a high accuracy a plurality of magnetic sensors arranged inside a small magnetic detection apparatus. The magnetic detection apparatus that detects magnetism of a paper sheet being transported includes a plurality of magnetic sensors arranged in a linear manner in a direction orthogonal to a transport direction of the paper sheet; an excitation member having a plate-shape that extends in an arrangement direction of the plurality of magnetic sensors; and a control unit that generates a calibration magnetic field by passing an electric current in the arrangement direction through the excitation member, and obtains a correction value for correcting variation in sensitivity of the plurality of magnetic sensors based on detection results of the calibration magnetic field detected by the plurality of magnetic sensors.