Pyramidal Brain Wave Electrode Scalp Contact
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Solution Overview
Problem
Existing brain wave detection electrodes with low protrusion height struggle with insufficient scalp contact due to electrode tips being buried in hair, while increasing protrusion height leads to buckling and reduced electrode density, making it difficult to acquire brain waves effectively.
Innovation Solution
A brain wave detection electrode with a pyramidal-shaped protrusion portion made of an elastic material, where the height of the pyramid is optimized to ensure the electrode tip is not buried in hair and maintains sufficient contact with the scalp, while also preventing buckling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the height of the protrusion portion is increased, then the electrode tip can be prevented from being buried in hair, but the protrusion portion becomes large and wide, reducing the number of electrodes that can be provided
Solution Approach 1:
The invention optimizes the height H of the protrusion portion within a specific range (0.5mm to 5.0mm) to balance two competing requirements: preventing electrode burial in hair while maintaining a compact size that allows sufficient number of electrodes to be provided on the measurement device
2Length of moving object
If the height of the protrusion portion is increased, then the electrode tip can maintain contact with the scalp, but the protrusion portion is likely to be buckled
Solution Approach 1:
The invention specifies an optimal height range (0.5mm to 5.0mm) that prevents buckling while ensuring adequate scalp contact. This parameter optimization balances structural stability with functional effectiveness
Solution Approach 2:
The protrusion portion is made from elastic material with specific physical properties (compression rate of 0.1% to 50%, hardness of 10 to 80 degrees Shore A) that provide both flexibility to prevent buckling and sufficient rigidity to maintain contact with the scalp
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 optimized electrode configuration ensures reliable and stable contact with the scalp, allowing for effective acquisition of brain waves without the issues of electrode burial or buckling.
Implementation Method 1
the protrusion portion is an elastic body and has a pyramidal shape
Data Source
AI summary
Provided is a brain wave detection electrode which is brought into contact with a head of a subject to detect brain waves, the brain wave detection electrode including a base portion, a plurality of protrusion portions protruding from the base portion, and an electrode portion provided in the protrusion portion, in which the protrusion portion is an elastic body and has a pyramidal shape, and the following expression (1) is satisfied with a number N of the protrusion portions, a height H of a pyramid of the protrusion portion, a width D of the pyramid of the protrusion portion, a load F acting on the plurality of protrusion portions, a pressure P acting on a region where a tip of the protrusion portion is in contact with the head when the load F has acted, and a thickness h of hair of the head of the subject.H>3D32D3-K(FNP)3/2h(1)provided that K represents the following value depending on the pyramidal shape.{(23)3/2(hexagonal pyramid)1(quadrangular pyramid)33/4(triangular pyramid)(2π)3/2(cone)Here, K is set to the following value according to the pyramidal shape. Expression (2)