Pressure-Sensitive Element Using Contact Area Capacitance
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Solution Overview
Problem
Conventional pressure-sensitive elements have a narrow pressing force measurement range and complex structures, which limit their effectiveness on free-form surfaces such as those found in humanoid robots and automotive interiors.
Innovation Solution
A pressure-sensitive element with a dielectric layer between conductive members, detecting pressing force based on variations in electrostatic capacitance due to changes in the contact area rather than distance, featuring a simple structure and wide measurement range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a pressure-sensitive element uses a configuration that detects pressing force based on distance change between electrodes (as in PTL 3), then pressing force can be detected, but the pressing force measurement range becomes relatively narrow
Solution Approach 1:
The patent changes the detection parameter from distance change to contact area change. The pressure-sensitive element uses a conductive elastomer whose contact area with the conductive substrate changes under pressing force, and this area change is detected as capacitance variation. This parameter change enables a wider pressing force measurement range while keeping the structure simple.
2Ease of manufacture
If a pressure-sensitive element uses a connecting part with crank-shaped bend structure (as in PTL 2), then detection elements can be connected, but the structure becomes complex
Solution Approach 1:
The patent merges the connection function and the pressure-sensitive function into a single integrated structure. The conductive elastomer serves both as the pressure-sensitive material and as the connecting element between detection points, eliminating the need for separate crank-shaped bend structures while maintaining ease of manufacture.
3Measurement precision
If a pressure-sensitive element uses conductive threads with distance-based detection (as in PTL 1), then pressing force can be detected, but the pressing force measurement range becomes relatively narrow
Solution Approach 1:
The patent changes the detection parameter from distance change to contact area change. The pressure-sensitive element uses a conductive elastomer whose contact area with the conductive substrate changes under pressing force, and this area change is detected as capacitance variation. This parameter change enables a wider pressing force measurement range while keeping the structure simple.
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 solution enables a wider range of pressing force measurement with improved pressure sensitivity and a simplified structure, effectively addressing the limitations of existing technologies.
Implementation Method 1
The detector detects pressing force based on a variation in electrostatic capacitance between the first conductive member and the second conductive member
Implementation Method 2
The pressure-sensitive part has a first conductive member (11) that has elasticity
Data Source
AI summary
The present disclosure provides a pressure-sensitive element having a relatively wide pressing force measurement range and a relatively simple structure. Pressure-sensitive element is provided with pressure-sensitive part that receives pressing force and detector that detects the pressing force, and has a structure described below. That is, pressure-sensitive part has first conductive member that has elasticity, second conductive member, and dielectric body. Dielectric body is disposed between first conductive member and second conductive member, and at least partially covers the surface of first conductive member or second conductive member. Detector detects pressing force based on a variation in electrostatic capacitance between first conductive member and second conductive member.