Digital Crown Variable Friction for Mode-Specific Tactile Feedback
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Solution Overview
Problem
Traditional input mechanisms in electronic watches and devices provide fixed tactile feedback, which cannot be varied or configured for different modes or operations, limiting user interaction and feedback.
Innovation Solution
A variable friction mechanism is integrated into the crown of an electronic watch, allowing for the production of variable frictional feedback by changing the resistive torque as the crown is rotated, in response to signals from a processing unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional input mechanisms are used, then the device structure is simple, but the tactile feedback is fixed and cannot be varied for different modes or operations
Solution Approach 1:
The patent applies the dynamics principle by making the friction characteristic of the crown adjustable rather than fixed. The processing unit dynamically changes the friction level based on operational modes, allowing the same physical component to provide different tactile feedback characteristics for different functions (e.g., higher friction for scrolling, lower friction for rapid rotation). This resolves the contradiction by enabling feedback variability without requiring multiple separate input mechanisms.
Solution Approach 2:
The patent implements parameter changes by modifying the friction parameter of the crown input mechanism. The processing unit controls the friction characteristic to vary between different levels depending on the operational context. This allows the system to adapt tactile feedback to different modes (such as scrolling versus mode switching) while using a single unified input device, thereby improving versatility without proportionally increasing complexity.
2Ease of operation
If variable friction mechanism is added to provide customizable tactile feedback, then user interaction is enhanced, but the device complexity increases
Solution Approach 1:
The patent applies universality by making the crown serve multiple functions with different friction characteristics. Instead of having separate input mechanisms for different operations, the single crown is equipped with variable friction control that allows it to be optimized for different tasks (scrolling, mode switching, rapid navigation). This multi-functionality approach enhances user interaction quality while avoiding the complexity of adding multiple separate input devices.
Solution Approach 2:
The patent implements feedback by using the processing unit to monitor operational context and adjust the crown's friction characteristic accordingly. The system provides tactile feedback to the user by varying resistance during rotation, confirming the current operational mode and providing intuitive haptic cues. This feedback mechanism enhances ease of operation by making the interaction more intuitive and informative without requiring complex additional hardware.
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 variable friction mechanism enhances user interaction by providing customizable tactile feedback that corresponds to operational states, inputs, and outputs, improving the overall user experience and interaction with the electronic device.
Implementation Method 1
The variable friction mechanism is configured to produce a variable frictional feedback as the crown is rotated by the rotational input
Data Source
AI summary
An electronic device, such as a watch, has a variable friction mechanism for providing variable frictional feedback as an input mechanism, such as a crown, is rotated. The variable frictional feedback may correspond to operational states, events, or other conditions at the electronic watch. The variable frictional feedback may be provided by changing a frictional force between the crown and the variable friction mechanism. The variable friction mechanism may include a friction element adapted to contact a shaft of the crown and an actuator adapted to change a frictional force between the friction element and the shaft.