Capacitance Load Sensor Twist Pitch Optimization
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Solution Overview
Problem
Load sensors with twisted wire configurations experience untwisting issues when repeatedly loaded, leading to inaccurate capacitance measurements and poor load detection.
Innovation Solution
A load sensor design where the twist pitch of twisted conductor wires is optimized to satisfy the condition p ≤ 12nd, suppressing untwisting and maintaining consistent capacitance characteristics, allowing for accurate load detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a twisted wire configuration is used to increase bending strength, then the structural strength is improved, but untwisting occurs during repeated loading which causes capacitance characteristics to change and reduces measurement precision
Solution Approach 1:
The patent applies parameter changes by optimizing the twist pitch to satisfy p ≤ 12nd, where this specific parameter range prevents untwisting during repeated loading while maintaining the bending strength benefits of the twisted wire configuration, thereby resolving the contradiction between strength improvement and measurement precision
2Stability of the object's composition
If the twist pitch is reduced to suppress untwisting, then the stability of capacitance characteristics is improved, but the structural flexibility and ease of manufacture are reduced
Solution Approach 1:
The patent identifies the specific parameter range p ≤ 12nd as the optimal balance point where the twist pitch is sufficiently reduced to suppress untwisting and maintain capacitance stability, while not being so reduced as to create excessive manufacturing difficulty, thus resolving the contradiction between stability and ease of manufacture
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 optimized twist pitch configuration ensures reliable and accurate load detection by minimizing changes in capacitance, even after repeated loading, thereby enhancing the sensitivity and reliability of the load sensor.
Implementation Method 1
the detector detects a pressing force on the basis of change in capacitance between the first electrically-conductive member and the second electrically-conductive member
Implementation Method 2
a dielectric body. The first electrically-conductive member has elasticity. The second electrically-conductive member is formed in a linear shape
Data Source
AI summary
A load sensor includes: a first base member and a second base member disposed so as to face each other; an electrically-conductive elastic body disposed on an opposing face of the first base member; and a conductor wire disposed between the second base member and the electrically-conductive elastic body and configured as a plurality of element wires being twisted. Each element wire is configured as an electrically-conductive member which has a linear shape and of which the surface is covered by a dielectric body. A twist pitch of the plurality of element wires satisfies a conditional expression “p≤12nd”. In the expression, p is the twist pitch of the plurality of element wires, n is the number of the element wires included in the conductor wire and d is the outer diameter of each element wire.