Headband Earmuff Electrode Layout for Head Muscle Biosignal Sensing
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Solution Overview
Problem
Existing electroencephalographs cannot effectively measure or analyze muscle activity near the head, such as that of the masseter muscle or sternocleidomastoideole, despite being capable of brain activity measurements.
Innovation Solution
A biosignal measurement unit with a headband and earmuffs, featuring strategically positioned electrode parts that measure biosignals from the head and muscle areas, including a first muff-side electrode part positioned forward and downward of the earmuff and a band-side electrode part for amplifying signal differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If an electroencephalograph is configured to measure brain activity, then brain activity measurement capability is improved, but muscle activity measurement capability deteriorates
Solution Approach 1:
The electroencephalograph is designed with multiple electrode parts positioned at different locations to perform both brain activity measurement (via band-side electrode parts on the headband) and muscle activity measurement (via muff-side electrode parts near the ears), enabling the single device to handle multiple measurement functions simultaneously
Solution Approach 2:
The electrode system is divided into distinct segments: band-side electrode parts for brain activity measurement and muff-side electrode parts for muscle activity measurement. This segmentation allows each electrode part to be optimized for its specific measurement function while working together as an integrated system
2Measurement precision
If electrode parts are positioned to measure brain activity, then brain signal quality is improved, but muscle activity detection capability deteriorates
Solution Approach 1:
Different regions of the headband are equipped with electrode parts having different functional qualities: band-side electrode parts are positioned to optimize brain signal acquisition, while muff-side electrode parts are positioned near the ears to optimize muscle activity detection, allowing each local region to excel at its specific measurement task
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 accurate measurement and analysis of muscle activity near the head with a simpler device configuration, enhancing the capability to analyze motor intention, cognitive state, and fatigue state by considering muscle activity.
Implementation Method 1
a first muff-side electrode part provided to the first protruding member at a position close to a distal end of the first protruding member, the first muff-side electrode part being configured to measure a biosignal in the person to be measured
Data Source
AI summary
A biosignal measurement unit and a condition analysis system. In a side view from a first earmuff of a biosignal measurement unit, when a straight line parallel to a downwardly extending direction of a headband and passing through a centroid of a plane region formed by the first earmuff is defined as a first reference line, and a straight line orthogonal to the first reference line and passing through the centroid is defined a second reference line, a first position is located at a position forward of the first reference line and downward of the second reference line.