Clip-Worn DON/DOFF Sensor With Optical Detection
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Solution Overview
Problem
Existing DON/DOFF sensors for wearable devices are prone to false triggering and have drawbacks such as mechanical switch susceptibility to external objects, leading to inaccurate detection of whether a device is being worn or not.
Innovation Solution
A clip-worn apparatus with a spring-loaded DON/DOFF sensor clip featuring a light source and detector, or other sensors like mechanical switches, capacitive sensors, and multi-sensor configurations to accurately determine the wear state by obstructing or detecting light, pressure, or other physical properties, reducing false triggers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a mechanical switch sensor is used to detect DON/DOFF state, then the device can detect whether it is being worn, but the sensor is susceptible to false triggering by external objects
Solution Approach 1:
The patent replaces mechanical switch-based DON/DOFF sensors with optical sensors that detect light presence or absence to determine wear state. This substitution eliminates mechanical contact points that are susceptible to false triggering by external objects, while maintaining reliable detection capability through optical field interactions that are less prone to environmental interference.
Solution Approach 2:
The patent changes the detection parameter from mechanical contact state to optical properties (light presence, intensity, or wavelength). By measuring optical parameters rather than mechanical switch states, the system achieves more reliable DON/DOFF detection that is not easily affected by external objects causing false mechanical triggers.
2Measurement precision
If other types of DON/DOFF sensors are used, then detection capability is provided, but they are susceptible to false triggering and have other drawbacks
Solution Approach 1:
The patent introduces light as an intermediary medium for detecting wear state. Instead of direct mechanical contact or other sensor types prone to false triggering, the optical field serves as a mediator that interacts with the target object during wear, providing accurate measurement while maintaining high reliability through non-contact detection.
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
The solution effectively minimizes false triggering and provides reliable detection of the wear state, enhancing the accuracy and reliability of determining whether a device is being worn or not, thus improving user experience and device management.
Implementation Method 1
one including a light source and the other a light detector
Implementation Method 2
the spring-loaded action of the DON/DOFF sensor clip brings the opposing ends of the DON/DOFF sensor clip into contact
Data Source
AI summary
Clip-worn apparatuses having sensor clips configured to detect whether electronic devices, such as communications headsets, are being worn (i.e., “donned” or “DON'd”) or are not being worn (i.e., “doffed” or “DOFF'd”) by a user. An exemplary clip-worn apparatus includes a DON/DOFF sensor clip having a clip with a first end and an opposing second end. The first end includes a source (e.g., a light source). The opposing second end includes a detector (e.g., a light detector). When the clip-worn apparatus is DOFF'd, a detection path between the source and the detector is clear and unobstructed. When the clip-worn apparatus is DON'd (by clipping the DON/DOFF sensor clip to a target object, e.g., a user's ear), the target object becomes positioned between the source and the detector, thereby obstructing the detection path between the source and the detector.