Wearable Device Wear-Status Detection Using Elastic Proximity Sensing
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Solution Overview
Problem
Existing wearable devices face challenges in accurately detecting user wear status with low power consumption and minimizing false triggers.
Innovation Solution
A detection module with a proximity sensor and elastic material is integrated into wearable devices, using infrared light reflection to measure distance changes when worn, allowing switching between active and standby modes based on predefined thresholds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If continuous detection is performed to accurately sense user wear status, then detection reliability is improved, but power consumption increases
Solution Approach 1:
The system performs detection at periodic intervals rather than continuously. The controller is configured to perform detection at a first detection interval when the device is in a first state (e.g., not worn), and at a second detection interval when the device is in a second state (e.g., worn). This periodic detection approach maintains detection reliability while significantly reducing power consumption compared to continuous detection.
2Measurement precision
If detection sensitivity is increased to accurately detect wear status, then measurement precision is improved, but false triggers increase
Solution Approach 1:
The system dynamically changes detection parameters based on the device state. Different detection intervals are applied depending on whether the device is worn or not worn. Additionally, the system uses multiple detection results over time intervals to determine state changes, effectively filtering out transient false signals while maintaining sensitivity to genuine wear events.
3Speed
If detection interval is reduced to improve real-time detection, then response speed is improved, but power consumption increases
Solution Approach 1:
The detection interval is made dynamic rather than fixed. The controller automatically adjusts the detection interval based on the detected state of the wearable device. When the device is detected as worn, a shorter detection interval is applied for faster response. When not worn, a longer interval is used to conserve power. This dynamic adjustment resolves the contradiction between fast response and low power consumption.
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
Enables accurate detection of user wear status while reducing power consumption and preventing false triggers by optimizing measurement intervals and thresholds.
Implementation Method 1
using infrared light reflection to measure distance changes when worn
Implementation Method 2
The lower casing has an elastic material... The elastic material has a contact surface for a user to contact
Data Source
AI summary
A wearable device includes a main body, a detection module and a controller. The detection module is located on the main body and includes an upper casing, an opposite lower casing and a proximity sensor. The lower casing has an elastic material. The proximity sensor is located on the upper casing to measure a distance from the proximity sensor to the elastic material. The controller is electrically connected to the detection module. The elastic material has a contact surface for the user to contact when the wearable device is worn on the user, thereby switching between an active mode and a standby mode of the wearable device. In addition, the present disclosure further includes an earbud.