Three-Axis Capacitive Sensor Layered Structure
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Solution Overview
Problem
Existing multi-axis force sensors have complex configurations due to the combination of multiple single-axis pressure sensors, making them cumbersome and space-intensive for detecting forces on a robot's front surface.
Innovation Solution
A three-axis sensor with a capacitive type detection layer, electrically conductive layers, and deformation layers, where the separation layer's 25% CLD value is significantly higher than the deformation layers', allowing for simpler and more compact force detection by separating and deforming under pressure, enabling effective detection of three-axis forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple single-axis pressure sensors are combined to detect multi-axis force vectors, then the detection capability is improved, but the sensor configuration becomes complicated
Solution Approach 1:
The patent combines multiple pressure sensing functions into a single integrated sensor element. The sensor includes a first detection layer with first pressure sensing sections and a second detection layer with second pressure sensing sections, where both layers work together in one compact structure to detect multi-axis forces, eliminating the need for separate sensors arranged in complex configurations.
Solution Approach 2:
The patent utilizes the thickness direction (z-axis) as an additional dimension by stacking the first detection layer and second detection layer at different positions along the thickness direction. This layered structure enables three-axis force detection (x, y, z directions) within a compact volume, transforming a two-dimensional sensor plane into a three-dimensional detection system.
2Measurement precision
If multiple pressure sensors are arranged to detect force direction and position, then the detection accuracy is improved, but the sensor occupies more space
Solution Approach 1:
The patent employs a nested layered structure where the second detection layer is positioned at a different location in the thickness direction relative to the first detection layer. This nesting approach allows multiple sensing elements to occupy overlapping or adjacent spatial regions, maximizing detection capability while minimizing the overall sensor footprint.
3Stability of the object's composition
If the separation layer has high elasticity to separate detection layers, then the structural stability is improved, but the sensitivity to pressure detection decreases
Solution Approach 1:
The patent applies local quality by creating a localized pressure transmission path through the separation layer. The separation layer includes a through-hole that provides a dedicated channel for pressure transmission, allowing the separation layer to maintain its elastic properties for structural stability while the through-hole region provides precise pressure detection capability.
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 the detection of three-axis forces with a relatively simple and space-saving configuration, improving sensitivity and reducing the complexity of the sensor setup, allowing for precise force detection on a robot's surface.
Implementation Method 1
a first deformation layer that is provided between the first electrically conductive layer and the first detection layer, and is elastically deformed in accordance with pressure acting in a thickness direction of a sensor
Implementation Method 2
a first sensing section of a capacitive type; a second sensing section of the capacitive type
Data Source
AI summary
A three-axis sensor includes: a first detection layer having a first surface, and a second surface on side opposite to the first surface, and including a first sensing section of a capacitive type; a second detection layer having a first surface opposed to the second surface of the first detection laver, and including a second sensing section of the capacitive type; a first electrically conductive layer provided to be opposed to the first surface of the first detection layer; a second electrically conductive layer provided between the first detection layer and the second detection layer; a separation layer provided between the first detection layer and the second electrically conductive layer to separate the first detection layer and the second electrically conductive layer from each other; a first deformation layer that is provided between the first electrically conductive layer and the first detection layer, and is elastically deformed in accordance with pressure acting in a thickness direction of a sensor; and a second deformation layer that is provided between the second electrically conductive layer and the second detection layer, and is elastically deformed in accordance with pressure acting in the thickness direction of the sensor. A 25% CLD value of the separation layer is 10 or more times a 25% CLD value of the first deformation layer, and the 25% CLD value of the separation layer is 10 or more times a 25% CLD value of the second deformation layer.