Wearable Band Tightness Sensor Using Capacitive Plates
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Solution Overview
Problem
Wearable electronic devices face challenges in accurately determining and maintaining the optimal tightness of bands attached to users' body parts, which affects the accuracy of health sensors' measurements due to variations in band tightness and user movement.
Innovation Solution
Incorporating a tightness sensor, such as capacitive plates, strain gauges, or pressure sensors, into the band to monitor and adjust the tightness, ensuring the health sensor operates within optimal tightness ranges by providing feedback to the user or adjusting the band automatically.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a tightness sensor is added to the wearable device, then the measurement accuracy of the health sensor is improved, but the device complexity increases
Solution Approach 1:
The patent replaces complex mechanical tightness sensing mechanisms with capacitive sensing technology. The capacitive sensor detects changes in capacitance caused by variations in band tightness, providing accurate measurements without requiring mechanical moving parts. This substitution maintains measurement precision while reducing device complexity and improving reliability.
Solution Approach 2:
The patent introduces a processing unit that acts as an intermediary between the capacitive sensor and the health sensor. This processing unit analyzes capacitance changes to determine tightness levels and adjusts health sensor measurements accordingly, enabling accurate health monitoring while managing the complexity of having multiple sensors through intelligent data processing.
2Reliability
If the band tightness is not monitored, then the device complexity is reduced, but the reliability of health sensor operation deteriorates
Solution Approach 1:
The patent implements a feedback mechanism where the capacitive sensor continuously monitors band tightness and provides data to the processing unit. The processing unit uses this feedback to determine whether the band tightness is within the optimal range for health sensor operation and provides appropriate outputs (such as haptic feedback or visual indicators) to guide users in adjusting the band, thereby ensuring reliable health sensor operation.
Solution Approach 2:
The system enables users to self-adjust the band tightness based on feedback from the capacitive sensor and processing unit. By providing real-time information about tightness levels and optimal ranges, the system allows users to independently maintain proper band fit, ensuring reliable health sensor operation without requiring complex automated adjustment mechanisms.
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 enhances the accuracy of health sensor measurements by maintaining optimal band tightness, reducing errors caused by loose or tight bands and user movement, thereby improving data reliability.
Implementation Method 1
The tightness sensor may include first and second capacitive plates that are operable to change proximity with respect to each other in response to a change in the tightness of the band. In such an example, the signal may indicate a capacitance between the first and second capacitive plates.
Implementation Method 2
In various examples, the tightness sensor may include a strain gauge. The strain gauge may be positioned in the band along a lengthwise dimension of the band.
Implementation Method 3
In some examples, the tightness sensor may include a pressure sensor positioned in an air bladder. The tightness of the band may be related to a pressure in the air bladder.
Data Source
AI summary
A wearable electronic device has a processing unit and a health sensor included in a housing, a band operable to couple the housing to a body part of a user, and a tightness sensor coupled to the band. The tightness sensor is operable to produce a signal indicative of a tightness of the band on the user's body part. The processing unit determines a tightness of the band based on the signal and perform one or more actions based thereon. Such actions may include evaluating the signal for changes in the tightness of the band according to operational tolerances of the health sensor, providing output directing the user to adjust the band to improve operation of the health sensor, monitoring changes in the tightness of the band and adjusting a measurement obtained by the health sensor, and so on.