Rotatable Bezel with Mechanical Teeth for Wearable Switch Detection
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Solution Overview
Problem
Wearable electronic devices, such as smart watches, face challenges in providing an effective user interface due to spatial constraints, with existing solutions like optical sensors and mechanical switches being bulky, power-intensive, and unreliable, which complicates navigation and interaction with complex applications.
Innovation Solution
A rotatable bezel with at least two switches that are sequentially activated by its teeth, allowing for reliable detection of rotation events and direction, using a low-power microprocessor and bidirectional click springs for enhanced user interaction, while maintaining watertightness and dustproofness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Difficulty of detecting and measuring
If optical sensors are used to detect bezel rotation, then rotation detection capability is provided, but device size increases and power consumption rises
Solution Approach 1:
The patent replaces optical sensing mechanisms with a purely mechanical detection system using a detent mechanism and microswitches. The bezel incorporates mechanical teeth that directly engage with switch actuators, eliminating the need for optical components, textured surfaces, and complex sensor assemblies. This mechanical substitution reduces device volume while maintaining rotation detection functionality.
Solution Approach 2:
The invention extracts and eliminates the optical sensor subsystem entirely, using only essential mechanical components (teeth, detent, microswitches) for rotation detection. By removing the optical detection layer and relying on direct mechanical engagement, the device achieves compact dimensions without sacrificing functional capability.
2Difficulty of detecting and measuring
If optical sensors are used to detect bezel rotation, then rotation detection capability is provided, but power consumption increases
Solution Approach 1:
The patent replaces power-intensive optical sensors with a passive mechanical detection system. The microswitches are actuated directly by mechanical engagement of bezel teeth with switch actuators, requiring no continuous power supply for detection. This eliminates the power consumption associated with optical LED sources, photodetectors, and signal processing circuits while maintaining reliable rotation detection.
Solution Approach 2:
The mechanical detection system operates periodically only when the bezel is rotated, with microswitches triggered by passing teeth. This event-driven operation consumes power only during interaction moments, whereas optical sensors would require continuous operation to maintain detection readiness, significantly reducing overall power consumption.
3Volume of moving object
If mechanical switches are used for rotation detection, then compact design is achieved, but reliability decreases due to wear and malfunction
Solution Approach 1:
The patent incorporates a detent mechanism that provides controlled mechanical engagement and disengagement for the microswitches. The detent structure ensures proper alignment and timing of tooth-to-switch contact, preventing premature wear and malfunction. This pre-engineered engagement mechanism cushions the mechanical interaction, extending component life and maintaining reliability.
Solution Approach 2:
The invention carefully controls the physical parameters of the mechanical system, including tooth geometry, switch actuation force, and detent engagement characteristics. By optimizing these parameters, the system achieves reliable operation with minimal wear, balancing compact mechanical design with long-term durability and consistent performance.
4Ease of operation
If mechanical components are added for rotation detection, then user interaction capability is enhanced, but device complexity increases
Solution Approach 1:
The bezel structure serves multiple functions: it provides the user interface for rotation input, contains the mechanical teeth for detection, and integrates with the detent mechanism for positional feedback. This multi-functionality eliminates the need for separate components, reducing overall device complexity while enhancing interaction capabilities through the unified mechanical system.
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 provides an efficient and user-friendly interface for wearable devices by enabling intuitive rotation-based interactions with minimal power consumption and robust mechanical design, enhancing usability and reliability without compromising the device's sealing integrity.
Implementation Method 1
bidirectional click springs
Data Source
AI summary
An electronic device includes a processor configured to implement a user interface for allowing a user to interact with the electronic device. The electronic device further includes a bezel and at least two switches. The bezel is rotatably mounted on a housing of the electronic device. A plurality of teeth of the bezel sequentially activate the at least two switches during rotation of the bezel. The rotation of the bezel allows the user to interact with the electronic device on the basis of the user interface.