Strain Gauge Resistor Thickness for Vehicle Power and Signal Integrity
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Solution Overview
Problem
Existing human-powered vehicle components do not efficiently manage power consumption and signal integrity due to inadequate design of strain gauges and signal processing units, leading to suboptimal performance.
Innovation Solution
A human-powered vehicle component featuring a strain gauge with a metal resistor layer of specific thickness, integrated with a signal processing unit and power input, utilizing a gauge wire with lower electrical resistance to minimize power consumption and maintain signal integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the resistor cross-sectional area is reduced, then the electric resistance increases and electric power consumption decreases, but the signal output may be affected
Solution Approach 1:
The patent applies parameter changes by precisely controlling the metal layer thickness to create a resistor with optimized cross-sectional area. By setting the thickness within 0.01-1 micrometer, the patent achieves the desired balance between reduced power consumption and maintained signal integrity through quantitative parameter optimization.
Solution Approach 2:
The patent replaces traditional mechanical wire resistors with a thin-film metal layer structure. This substitution allows for precise control of the resistor's electrical properties through film thickness rather than mechanical dimensions, enabling optimized performance for human-powered vehicle applications.
2Use of energy by moving object
If the metal layer thickness is reduced, then the resistor cross-sectional area decreases and power consumption lowers, but manufacturing precision requirements increase
Solution Approach 1:
The patent establishes specific parameter ranges for metal layer thickness (0.01-1 micrometer) that balance power consumption reduction with manufacturability. These quantitative specifications provide clear manufacturing targets while maintaining the performance benefits of thin-film resistors.
3Reliability
If the gauge wire has lower electrical resistance, then signal loss decreases, but the wire may not provide sufficient current limiting
Solution Approach 1:
The patent segments the electrical path into distinct functional elements: the gauge wire with low resistance for signal transmission and the resistor with controlled resistance for current management. This segmentation allows each component to be optimized for its specific function without compromising the other.
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 component reduces electric power consumption and avoids signal loss, making it suitable for human-powered vehicles by optimizing resistor thickness and gauge wire composition.
Implementation Method 1
The resistor is formed by a metal layer having a thickness of 0.01 micrometers or greater and 1 micrometer or less. This reduces a cross-sectional area of the resistor. In a case where the cross-sectional area of the resistor is reduced, the electric resistance of the resistor is increased and the electric current at the resistor is decreased. This lowers electric power consumption of the resistor.
Implementation Method 2
Japanese Laid-Open Patent Publication No. 2018-144614 (Patent Document 1) discloses an example of a human-powered vehicle component including a strain gauge.
Data Source
AI summary
A component is provided for a human-powered vehicle. The component includes a component body, a strain gauge provided on the component body, a signal processing unit electrically connected to the strain gauge, a signal output that outputs a signal from the signal processing unit, and an electric power input electrically connected to the signal processing unit and supplied with electric power from a power supply provided on at least one of the human-powered vehicle and the component body. The strain gauge includes a substrate and a resistor provided on the substrate. The resistor is formed by a metal layer having a thickness of 0.01 micrometers or greater and 1 micrometer or less.