Capacitive Watch Band for Wrist Detection
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Solution Overview
Problem
Existing wearable devices, such as smartwatches, face issues with accurately determining their configuration and location relative to the user, leading to unintended locking or other undesired consequences when worn loosely, due to the limitations of proximity sensors.
Innovation Solution
Incorporating a watch band with a capacitance sensor that changes its capacitance based on configuration changes, such as stretching or bending, to detect whether the device is on or off the wrist, allowing for dynamic adjustment of the fit and operational modes without user input.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a proximity sensor is used to detect whether the watch is on or off the wrist, then the watch can be locked when off-wrist, but users who wear their watch loosely experience unintentional locking
Solution Approach 1:
The patent replaces the optical proximity sensor system with a capacitive sensing system integrated into the watch band. The capacitive sensor detects changes in capacitance caused by the proximity of the user's body, providing more reliable wrist detection that is not affected by loose wearing conditions. This substitution resolves the contradiction by maintaining reliability while improving ease of operation.
Solution Approach 2:
The patent introduces a capacitive sensor as an intermediary element within the watch band structure itself, rather than relying on external proximity sensors in the watch body. This intermediary capacitive sensing mechanism provides direct contactless detection of wrist proximity through the band material, eliminating the false triggering issues that occur with loose wearing.
2Adaptability or versatility
If the watch band is made stretchable to improve fit, then the device can accommodate different wrist sizes, but the structural integrity and sensor accuracy may be compromised
Solution Approach 1:
The patent merges the structural band material with the capacitive sensing function by integrating conductive elements directly into the stretchable band material. This combination allows the band to maintain its elasticity and adaptability for different wrist sizes while the embedded capacitive sensor continuously monitors capacitance changes to detect wrist proximity accurately, resolving the contradiction between adaptability and reliability.
Solution Approach 2:
The patent utilizes changes in capacitance parameters as the band stretches or relaxes. The capacitive sensor detects specific capacitance values that correspond to different band tension states, allowing the system to distinguish between loose and tight wearing conditions. This parameter-based detection maintains sensor accuracy regardless of band stretchability.
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 enables accurate detection of the watch band's configuration, preventing unintended locking and enhancing user experience by allowing for secure and convenient operation based on the detected state, while also providing adjustable fit options.
Implementation Method 1
the substrate includes a capacitance sensor configured to measure a capacitance of the substrate
Implementation Method 2
The watch band is configured to change a characteristic of the watch band when the watch band changes its configuration... the substrate includes a piezoelectric material configured to generate an electrical signal in response to stretching of the substrate
Data Source
AI summary
Characteristics of a watch band can change when placed in different configurations, and each of these characteristics can be correlated with each of the various configurations. The characteristics can be measured to detect in which of the various configurations the watch band is in. For example, the watch band can include an adjustable capacitor that changes it capacitance when the watch band changes its configuration. For example, the capacitance can change based on stretching of the watch band, bending of the watch band, and/or securement and release of an engagement element. The watch or another device can perform one or more operations based on the detected characteristic and configuration of the watch band.