Impedance-Based Motion Sensor for Versatile User Interaction
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Solution Overview
Problem
Conventional sensors that use deformable materials to detect user motions can only identify a single motion and require complex configurations to detect multiple motions, limiting their versatility.
Innovation Solution
A sensor with a deformable structure body, embedded electrodes, and a determination unit that measures impedance changes to identify various user motions, allowing efficient recognition of multiple motions through a single configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional sensors use two electrodes to detect deformation, then a single motion can be detected, but multiple motions require complicated configurations
Solution Approach 1:
The patent applies universality by enabling a single electrode to perform multiple detection functions. By measuring impedance at multiple frequencies, the same electrode configuration can identify various motions (compressing, bending, twisting, shearing) without requiring additional electrodes or complex wiring, thus achieving multi-functionality with a simple structure
Solution Approach 2:
The patent utilizes parameter changes by measuring impedance at multiple frequencies (e.g., 10 kHz, 100 kHz, 1 MHz). By changing the measurement frequency parameter, the sensor can distinguish between different types of deformation, allowing a single electrode to detect multiple motion types through parameter variation rather than structural complexity
2Measurement precision
If conventional sensors use porous materials with conductive ink, then deformation can be detected, but identification of multiple motions is limited
Solution Approach 1:
The patent replaces the mechanical approach of using multiple sensors and wiring combinations with an electrical measurement approach. Instead of mechanically configuring multiple electrodes to detect different motions, the invention uses electrical impedance measurement at multiple frequencies to substitute for the complex mechanical arrangement, achieving precise motion identification with simpler means
Solution Approach 2:
The patent introduces frequency as an intermediary parameter in the measurement process. By using multiple frequencies as intermediaries, the impedance measurement can reveal different aspects of the deformation, enabling precise identification of various motions without directly complicating the sensor structure or wiring
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 efficient identification of multiple user motions by measuring impedance changes, improving determination accuracy and simplifying the sensor configuration, allowing for versatile applications such as controlling external devices.
Implementation Method 1
a determination unit configured to determine a contact state of an object with the structure body based on a change in impedance measured using the electrode
Data Source
AI summary
Provided is a sensor that is able to efficiently identify a variety of motions made by a user. The sensor includes: a structure body configured to be deformable by an external force; an electrode configured to be disposed at an arbitrary position of the structure body; a determination unit configured to determine a contact state of an object with the structure body based on a change in impedance measured using the electrode; and an output unit configured to output a signal based on the contact state of the object with the structure body to an external device.