Magnet-Based Pressure Sensor Calibration Without Pressing Mechanisms

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Solution Overview

Problem

Conventional calibration methods for pressure distribution sensors require large-scale pressing mechanisms, making it difficult to achieve low cost, stability, and simplicity simultaneously due to variations in pressure sensitivity over time or due to environmental factors.

Innovation Solution

A calibration method using a magnet to apply a predetermined pressing force to a pressure sensor, detecting sensor output, estimating deterioration by comparing with specified values, and generating correction data to calibrate the sensor.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional calibration devices and methods are used, then calibration can be performed, but the system becomes complex and costly due to large-scale pressing mechanisms

Engineering Contradiction:

Improvecalibration accuracyVSAvoidpressing mechanism complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent replaces the conventional mechanical pressing mechanism with a magnetic field-based calibration system. A magnet is used to generate a magnetic force that acts on the pressure sensor through its sensitive surface, eliminating the need for complex mechanical pressing devices while achieving the same calibration effect. This substitution of mechanical action with magnetic action resolves the contradiction between calibration reliability and device complexity.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Reliability

If conventional calibration devices and methods are used, then calibration can be performed, but the cost increases due to large-scale pressing mechanisms

Engineering Contradiction:

Improvecalibration accuracyVSAvoidmanufacturing cost

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent replaces expensive mechanical pressing mechanisms with a simple magnet-based system. The magnet can be attracted to the pressure sensor's sensitive surface to apply calibration force, eliminating the need for costly large-scale pressing equipment. This substitution dramatically reduces manufacturing costs while maintaining calibration accuracy.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent uses a magnet as a disposable or reusable calibration tool that is much cheaper than conventional pressing mechanisms. The magnet can be easily manufactured and replaced if needed, providing a cost-effective alternative to expensive mechanical calibration equipment while achieving the same calibration reliability.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

3Reliability

If conventional calibration devices and methods are used, then calibration can be performed, but the system becomes complicated and difficult to operate

Engineering Contradiction:

Improvecalibration accuracyVSAvoidcalibration operation simplicity

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The patent replaces complex mechanical pressing operations with simple magnetic attraction operations. The magnet can be easily brought close to or attached to the pressure sensor's sensitive surface to perform calibration, eliminating the need for complex mechanical assembly and operation procedures. This makes the calibration process much simpler and more user-friendly while maintaining accuracy.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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 calibration of pressure sensors without large-scale equipment, achieving low cost, stability, and simplicity by using a magnet to measure and correct sensor outputs based on environmental stability.

Implementation Method 1

placing a magnet on the pressure sensor, and attracting the magnet to the base material while interposing the pressure sensor therebetween

Methodology Applied

Scientific EffectMagnetic attraction: Magnetism

Data Source

PatentUS12379277B2Method of calibrating pressure sensor with magnet

Publication Date: 2025.08.05 JAPAN DISPLAY INC

AI summary

According to one embodiment, a calibration method includes placing a pressure sensor on a base material having magnetic properties, placing a magnet on the pressure sensor, attracting the magnet to the base material while interposing the pressure sensor therebetween and applying a predetermined pressing force onto the pressure sensor, detecting a sensor output of a pressure-sensitive portion pressed by the magnet, estimating the deterioration of the pressure sensor by comparing the sensor output with a specified value corresponding to characteristics of the magnet, generating correction data to calibrate the degradation and inputting the generated correction data to the pressure sensor.