Earbud Capacitive Wear Detection to Prevent False Touch Misjudgment
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Solution Overview
Problem
Existing earbud wearing detection systems are prone to misjudgment due to false touch, leading to incorrect identification of the earbud being worn, especially when placed on a table or held by hand, which affects accuracy and battery life.
Innovation Solution
The implementation of at least two capacitive wearing sensors positioned at different contact points on the earbud, with a detection processing circuit that determines the earbud's worn state based on maximum capacitance values, and a touch sensor to differentiate between correct and incorrect wear, reducing false positives and improving accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single capacitive sensing unit is used for wearing detection, then the structure is simple and cost is low, but false touch occurs causing misjudgment when the earbud is placed on a table or held by hand
Solution Approach 1:
The patent divides the wearing detection function into multiple independent capacitive sensing units positioned at different locations on the earbud head. Each sensing unit independently detects capacitance changes, and the system integrates signals from multiple units to determine wearing state. This segmentation approach reduces false touch misjudgment while maintaining relatively simple structure.
Solution Approach 2:
The patent transitions from single-point detection to multi-point spatial detection by arranging capacitive sensing units at different positions on the earbud head. This spatial dimensionality enhancement allows the system to distinguish between legitimate ear contact patterns and false touch scenarios, improving detection accuracy without proportionally increasing complexity.
2Measurement precision
If optical or infrared sensor schemes are used for wearing detection, then detection accuracy can be improved, but structure design becomes complicated and cost increases
Solution Approach 1:
The patent replaces optical or infrared sensing mechanisms with capacitive sensing technology. Capacitive sensing units detect changes in electrical capacitance caused by contact with skin, providing accurate wearing detection without requiring complex optical components, light sources, or infrared sensors. This substitution maintains detection accuracy while significantly simplifying structure design and reducing cost.
Solution Approach 2:
The patent changes the detection parameter from optical properties (light reflection, absorption) or infrared radiation to electrical capacitance properties. By measuring capacitance changes at multiple contact points, the system achieves accurate wearing detection using simple electrical measurements instead of complex optical or thermal sensing mechanisms.
3Ease of operation
If capacitive sensing units are placed on the outer surface of the earbud, then touch sensitivity is improved, but false touch occurs when the earbud is placed on surfaces
Solution Approach 1:
The patent segments the capacitive sensing units into multiple positions on the earbud head, including both outer surface and inner surface placements. By distributing sensing units across different surfaces and requiring coordinated capacitance changes across multiple units, the system maintains touch sensitivity while reducing false positive rates from accidental surface contact.
Solution Approach 2:
The patent merges the functions of wearing detection and touch sensing by using the same capacitive sensing units for both purposes. The detection system intelligently distinguishes between wearing states and touch operations based on the pattern and magnitude of capacitance changes, eliminating the need for separate sensor systems and resolving the contradiction between sensitivity and accuracy.
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
This solution significantly enhances the accuracy of wearing detection, preventing misjudgment and improving battery life by ensuring the earbud enters low power mode correctly when not in use and quickly responds to user interactions when worn.
Implementation Method 1
each of the at least two wearing sensors comprises one or more capacitive sensing units
Data Source
AI summary
An earbud and a method for implementing a wearing detection and a touch operation are provided. The earbud includes: at least two capacitive wearing sensors arranged at different positions where a head of the earbud is in contact with skin tissues in an ear, and the earbud being determined whether to be in a worn state according to the detection values of the at least two capacitive wearing sensors; a capacitive touch sensor arranged on the head or a stem of the earbud away from the ear and being configured to detect a touch operation; and a detection processing circuit being configured to detect and process capacitance signals detected by the wearing sensors and touch sensor, and the wearing sensors and touch sensor being electrically connected with the detection processing circuit and sharing the detection processing circuit.