Headset Biosignal Sensor Decoupling Mechanism
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Solution Overview
Problem
Existing headset devices for measuring biosignals during exercise suffer from inaccuracy due to movement-induced distortion, particularly in the head area, where sensors are influenced by wide-ranging movements, leading to unpredictable and irregular readings.
Innovation Solution
A headset device with a connection unit that allows relative movement between the headset body and sensor unit, utilizing features like two-dimensional rotation, three-dimensional rotation, sliding, and bending to offset transverse movements, and incorporating a spring element or ball joint to prevent direct movement transfer, ensuring stable sensor contact with the skin.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the sensor unit is directly connected to the headset body, then the structure is simple, but movement of the headset body is directly transferred to the sensor unit causing measurement inaccuracy
Solution Approach 1:
The device is divided into separate functional modules: headset body, connection unit, and sensor unit. The connection unit acts as an independent segment that decouples the sensor unit from headset body movements, allowing each part to perform its function independently while maintaining overall system functionality.
Solution Approach 2:
The connection unit serves as an intermediary element between the headset body and sensor unit. It mediates the interaction by allowing controlled relative movement while maintaining electrical and mechanical connections, thus protecting the sensor unit from direct impact of headset movements.
2Stability of the object's composition
If the sensor unit is fixed rigidly to the headset body, then the sensor position is stable, but any movement of the headset during exercise causes distortion and inaccuracy in biosignal measurement
Solution Approach 1:
The connection unit introduces dynamic characteristics to the system by allowing controlled relative movement between the headset body and sensor unit. This dynamic design enables the sensor unit to maintain stable contact with the skin while accommodating headset movements through rotational and sliding degrees of freedom.
Solution Approach 2:
The connection unit changes the mechanical parameters of the system by introducing rotational and sliding degrees of freedom. This allows the sensor unit to change its position and orientation relative to the headset body while maintaining stable contact with the skin, thus preserving measurement accuracy during exercise.
3Measurement precision
If a connection unit with multiple degrees of freedom is used, then movement distortion is reduced, but the device complexity increases
Solution Approach 1:
Multiple functional elements (rotational joint, sliding mechanism, spring element, bearing) are merged into a single integrated connection unit. This consolidation achieves complex movement compensation functionality while avoiding the need for multiple separate components, thus managing system complexity.
Solution Approach 2:
The connection unit performs multiple functions simultaneously: it provides rotational movement in multiple directions, sliding movement, spring-based shock absorption, and bearing-supported rotation. This multi-functionality allows a single component to handle various types of movements and forces, reducing the need for additional specialized components.
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 minimizes distortion caused by user movement, allowing for accurate and stable biosignal measurement during exercise by maintaining sensor contact and reducing the impact of perpendicular movements, thereby enabling reliable data collection and comfortable long-term wear.
Implementation Method 1
a spring element, ends of which are separately supported by the headset body and the sensor unit respectively, may be used as the connection unit
Implementation Method 2
a ball or a roller joint combined with the headset body and the sensor unit is provided, thereby preventing a movement of the headset device from being transferred to the sensor unit
Implementation Method 3
a ball or a roller joint combined with the headset body and the sensor unit is provided
Implementation Method 4
photo plethysmography (PPG) may be used for sensing a change of light
Data Source
AI summary
A headset device includes a headset body, a connection unit to move relative to the headset body, and a sensor unit having a light emitting element and a light receiving element to sense a biosignal, the sensor unit mounted to the connection unit to make contact with a human body. The sensor unit may measure a biosignal of a user, and the headset body and the sensor unit are indirectly connected by the connection unit. Accordingly, the sensor unit may be isolated from movement or vibration received through the headset body.