Cr Resistor Strain Gauge for High Gauge Factor, Low Transverse Sensitivity

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Solution Overview

Problem

Existing strain gauges with high gauge factors suffer from detection errors due to high transverse sensitivity ratios, which affect accuracy in strain detection.

Innovation Solution

A strain gauge design featuring a resistor made of Cr as a main component with a line width of 70 μm or less, resulting in a gauge factor of 5 or higher and a transverse sensitivity ratio of 70% or lower, achieved by controlling the line width of the resistor to reduce transverse sensitivity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If the gauge factor is increased to improve strain detection sensitivity, then the detection sensitivity is improved, but the transverse sensitivity ratio increases causing detection errors

Engineering Contradiction:

Improvestrain detection sensitivityVSAvoiddetection accuracy

Core Design Contradiction:

Measurement precisionVSReliability

Solution Approach 1:

The patent changes the physical parameter of the resistor by controlling its line width to be 70 μm or less. This parameter change simultaneously achieves a gauge factor of 5 or more while maintaining a transverse sensitivity ratio of 70% or less, resolving the contradiction between detection sensitivity and accuracy

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent uses a composite material containing Cr as a main component for the resistor. This material composition enables the resistor to achieve both high gauge factor and low transverse sensitivity ratio, overcoming the limitations of conventional materials

Inventive Principle:

Principle #40Composite materials

2Difficulty of detecting and measuring

If a high gauge factor is used to enhance strain detection capability, then the detection capability is enhanced, but transverse sensitivity causes measurement errors

Engineering Contradiction:

Improvestrain detection capabilityVSAvoidmeasurement accuracy

Core Design Contradiction:

Difficulty of detecting and measuringVSMeasurement precision

Solution Approach 1:

The patent applies parameter changes by precisely controlling the resistor line width to 70 μm or less. This dimensional parameter adjustment enables the strain gauge to achieve enhanced detection capability with a gauge factor of 5 or more while maintaining measurement accuracy through a transverse sensitivity ratio of 70% or less

Inventive Principle:

Principle #35Parameter changes

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

The design provides a strain gauge with improved accuracy by maintaining a high gauge factor while significantly reducing transverse sensitivity, enhancing strain detection precision.

Implementation Method 1

The resistor is made of a material containing Cr as a main component. A line width of the resistor is 70 μm or less such that a transverse sensitivity ratio of the strain gauge is equal to or less than 70% and a gauge factor of the strain gauge is equal to or greater than 5.

Methodology Applied

Scientific EffectPiezoresistive effect: Piezoresistive Effect

Implementation Method 2

The gauge factor of strain gauges is typically approximately 2, but some strain gauges that include resistors containing Cr as a main component have a gauge factor of approximately 10

Methodology Applied

Scientific EffectGauge factor effect:

Data Source

PatentUS20250231072A1Strain gauge

Publication Date: 2025.07.17 MINEBEAMITSUMI INC

AI summary

A strain gauge includes a substrate and a resistor formed over the substrate. The resistor is made of a material containing Cr as a main component. A line width of the resistor is 70 μm or less such that a transverse sensitivity ratio of the strain gauge is equal to or less than 70% and a gauge factor of the strain gauge is equal to or greater than 5.