Flexible Capacitive Earcup Sensor for Accurate On-Head Detection
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Solution Overview
Problem
Existing on-head detection solutions for headsets are not sufficiently adaptable to different head and ear shapes, leading to inconsistent capacitive data and increased power consumption due to false positives.
Innovation Solution
A headset with a flexible first sense electrode made of electrically conductive material, integrated into a cushion, maintains a constant distance to the user's head and ear, allowing for precise capacitive data collection and adaptable on-head/off-head detection, reducing false positives and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a rigid sense electrode is used, then the structure is simple and easy to manufacture, but the electrode cannot adapt to different head and ear shapes, leading to inconsistent capacitive data
Solution Approach 1:
The sense electrode is constructed as a flexible printed circuit board (FPC) with a flexible substrate that can conform to different head and ear shapes. This flexible film structure allows the electrode to adapt to various user anatomies while maintaining a relatively simple overall design, resolving the contradiction between adaptability and device complexity.
2Measurement precision
If the sense electrode is positioned closer to the head, then capacitive data collection is more accurate, but the electrode may cause discomfort or pressure on the user
Solution Approach 1:
The cushion is designed with a layered structure where the sense electrode is positioned only in the region where capacitive measurement is needed, while other areas provide comfort and cushioning. This localized placement allows accurate capacitive data collection near the head without causing discomfort across the entire cushion area, as the electrode is integrated specifically into the cushion structure rather than being a separate pressing component.
3Use of energy by moving object
If on-head detection is implemented to reduce power consumption, then battery usage is optimized, but false positives increase detection accuracy
Solution Approach 1:
The system continuously monitors capacitive data from the sense electrode and uses this feedback to dynamically adjust headset functionality. By processing capacitive measurements and comparing them against threshold values, the system can reliably determine on-head vs. off-head states, reducing false positives while enabling power consumption optimization through conditional functionality adjustment.
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 flexible sense electrode provides stable and uniform capacitive data collection, improving the accuracy of on-head/off-head detection and reducing power consumption by minimizing false positives, thus optimizing battery usage.
Implementation Method 1
The sensor is adapted to detect a first capacitive load C, which varies depending on the proximity of the head or ear of a user
Implementation Method 2
The first electrically conductive material is a flexible material configured to deform dependent on a head shape and/or an ear shape of a user of the headset when the user is wearing the headset
Data Source
Figure 1~2c
Figure 3a~3b
AI summary
The present disclosure relates to a headset with first earcup comprising a first electrically conductive material forming a first sense electrode. The first sense electrode is configured for capacitively-coupling to skin of a user of the headset when the user is wearing the headset. The first electrically conductive material is a flexible material configured to deform dependent on a head shape and/or an ear shape of a user of the headset when the user is wearing the headset.