Integrated Capacitance Electrode Layout for Earbud Wear and Touch Detection
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Solution Overview
Problem
Current capacitance detection solutions for wireless earphones face challenges such as high power consumption, environmental interference, and high production costs due to the need for separate chips for wearing detection and touch functions, as well as low detection accuracy and efficiency in optical and capacitive solutions.
Innovation Solution
A capacitance detection apparatus where the chip and detection electrode layer are integrally disposed, eliminating the need for additional wiring and protecting against environmental interference, allowing for simultaneous wearing detection and touch functions on a single chip, enhancing detection accuracy and reducing production complexity and costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If separate chips are used for optics-based wearing detection and capacitance-based touch operation, then both functions can be supported, but the cost is relatively high and device complexity increases
Solution Approach 1:
The patent combines the optical detection electrode and capacitance detection electrode into a single integrated detection apparatus. The detection electrode is configured to perform both optical detection (for wearing detection) and capacitance detection (for touch operation) functions, eliminating the need for separate chips and reducing overall device complexity while maintaining full functionality
Solution Approach 2:
The detection electrode is designed with multi-functionality, serving dual purposes: it acts as an optical detection electrode for wearing detection and simultaneously as a capacitance detection electrode for touch operation. This universal design allows a single component to fulfill multiple detection roles, reducing the number of components needed
2Measurement precision
If a detection electrode is attached on an inner surface of the earphone housing, then capacitance detection can be implemented, but environmental interference from circuit, water, sweat, temperature and humidity reduces detection accuracy
Solution Approach 1:
The patent extracts the detection electrode from the traditional housing inner surface location and integrates it directly with the speaker assembly. By positioning the detection electrode on the speaker's diaphragm or housing rather than the earphone's inner housing, the electrode is removed from the harmful environmental zone where water, sweat, and circuit interference occur, thereby improving detection accuracy
3Measurement precision
If an optical detection solution is used, then wearing detection can be achieved, but a hole must be opened on the surface as a light path which is not conducive to waterproof design
Solution Approach 1:
The patent merges the optical detection function with the existing speaker assembly structure. The detection electrode is integrated onto the speaker's diaphragm or housing, utilizing the speaker's existing acoustic aperture rather than requiring a separate optical window. This integration allows wearing detection to function through the speaker's natural opening, eliminating the need for additional holes that would compromise waterproofing
4Ease of manufacture
If additional analog wiring is added to electrically connect the detection electrode with the capacitance detection apparatus, then electrical connection can be established, but interference resistance ability is reduced and assembly complexity increases
Solution Approach 1:
The patent combines the detection electrode's electrical connection path with the speaker's existing electrical circuitry. The detection electrode is electrically connected to the capacitance detection apparatus through the speaker's existing wiring harness or PCB traces, eliminating the need for separate analog wiring. This integration reduces the number of additional wires required, simplifies assembly, and improves interference resistance by utilizing the speaker's established low-interference electrical path
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 improves detection accuracy, reduces production costs, and simplifies the assembly process, enabling a waterproof design while integrating multiple detection functions on a single chip, thus enhancing the overall performance and efficiency of wireless earphones.
Implementation Method 1
the detection electrode is configured to form at least one capacitance detection channel with an external electrode
Data Source
AI summary
Provided are a capacitance detection apparatus and an electronic device. The capacitance detection apparatus includes: a chip; and a detection electrode layer, where the detection electrode layer is integrally disposed with the chip and electrically connected to the chip, the detection electrode layer includes at least one detection electrode configured to form at least one capacitance detection channel, the at least one capacitance detection channel is respectively configured to output at least one capacitance detection signal, and the chip is configured to process the at least one capacitance detection signal.