Tactile Sensor with Magnetic Particles for Continuous Load Detection
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Solution Overview
Problem
Conventional tactile sensors in androids fail to continuously detect loads, leading to intermittent signal output when an area of the skin is pushed continuously, resulting in incorrect interpretation of continuous touch as intermittent contact.
Innovation Solution
A tactile sensor comprising an elastically deformable sheet with embedded coils and powdery or fibrous magnetic material, where a detection portion measures the inductance variation of the coils to accurately detect continuous loads and deformations, allowing for precise load detection and improved sensing accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional tactile sensors are dispersed across the mechanical portion and covered by the skin portion, then the structure is simple and easy to manufacture, but continuous load detection is not achieved and signals are output intermittently
Solution Approach 1:
The patent replaces the conventional mechanical piezo film sensor with an electromagnetic sensing system consisting of coils and magnetic particles. This substitution enables continuous load detection through inductance measurements while maintaining structural simplicity. The coils are embedded in the skin portion with magnetic particles dispersed throughout, creating a distributed sensing network that continuously monitors load without requiring complex mechanical components.
Solution Approach 2:
The patent creates a composite structure by embedding coils within the skin portion material and dispersing magnetic particles throughout the same material. This composite approach integrates multiple functional elements (conductive coils, magnetic particles, and structural matrix) into a unified sensor system that achieves continuous detection capability while maintaining the flexibility and simplicity of the original skin structure.
2Measurement precision
If electrodes are provided on both surfaces of a piezo film, then the sensor structure is simple, but measurement precision is insufficient for continuous touch detection
Solution Approach 1:
The patent replaces the piezo film electrode system with an electromagnetic inductance-based sensing system. Coils are embedded in the skin portion with magnetic particles dispersed in the surrounding material. This substitution provides superior measurement precision for continuous touch detection by measuring inductance changes rather than relying on piezoelectric signal generation, which has inherent limitations in continuous detection scenarios.
Solution Approach 2:
The patent changes the detection parameter from electrical voltage (piezo film) to inductance (coil-based system). By measuring inductance changes caused by magnetic particle displacement during continuous touch, the system achieves higher measurement precision. The inductance parameter provides continuous, analog measurement capability that better captures the nuances of sustained contact compared to the binary nature of piezoelectric signal generation.
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
Enables continuous load detection and enhanced sensing capabilities, providing a precise sense of touch to androids, reducing the number of parts and cost, while maintaining flexibility and stability of the skin portion.
Implementation Method 1
a coil that is provided in the sheet, a powdery or fibrous magnetic material that is provided in the sheet with the coil, and a detection portion that detects an inductance of the coil
Implementation Method 2
a powdery or fibrous magnetic material that is provided in the sheet with the coil
Data Source
AI summary
A tactile sensor has an elastically deformable sheet, a coil that is provided in the sheet, a powdery or fibrous magnetic material that is provided in the sheet with the coil, and a detection portion that detects an inductance of the coil. The coil is wound in a spiral shape and the powdery or fibrous magnetic material is dispersed in the sheet.