Electronic Crown Switch Module for Isolated Multi-Input Sensing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Electronic devices, particularly electronic watches, face challenges in effectively detecting and transmitting both rotational and translational inputs, such as touch and biometric signals, due to interference and signal isolation issues between components.
Innovation Solution
A switch module with a conductive dome and friction guard that transitions between uncollapsed and collapsed configurations to maintain a conductive path, providing an outward biasing force and isolating signals to prevent interference, allowing for efficient detection and transmission of inputs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conductive dome is used to maintain a conductive path, then signal transmission reliability is improved, but signal interference between components increases
Solution Approach 1:
The conductive path is segmented into multiple isolated sections. The friction guard creates distinct conductive regions that are electrically isolated from each other, allowing separate signal paths for different functions (rotational input, translational input, biometric sensing) without interference. Each segment handles a specific signal type, preventing cross-talk while maintaining overall system reliability.
Solution Approach 2:
The friction guard acts as an intermediary component between the conductive dome and the actuation member. It mediates the conductive path by providing controlled electrical contact points, isolating different signal paths while maintaining the necessary conductive connections. This intermediary structure prevents direct electrical interference between different input mechanisms.
2Adaptability or versatility
If multiple sensing mechanisms are integrated into the crown assembly, then input detection capability is improved, but device complexity increases
Solution Approach 1:
The crown assembly is designed as a multi-functional input device that combines rotational input detection, translational input detection, and biometric signal sensing within a single structure. The actuation member can perform multiple functions (rotation, pressing, touching) and the switch module handles multiple signal types through its segmented conductive path design, reducing the need for separate components and simplifying the overall device architecture.
Solution Approach 2:
Multiple sensing mechanisms are merged into a single integrated crown assembly. The rotational sensor, translational switch mechanism, and biometric sensor are combined in one structure, allowing the user to interact with the device through a single interface element. This merging reduces component count and simplifies the user interface while maintaining diverse input capabilities.
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 switch module enables reliable detection and transmission of translational and rotational inputs, enhancing user interaction and biometric signal processing while minimizing signal interference.
Implementation Method 1
The conductive dome may be configured to transition from an uncollapsed configuration to a collapsed configuration in response to a translational input at the actuation member
Implementation Method 2
A friction guard may be positioned between the conductive dome and the actuation member and may provide an outward biasing force on the conductive dome
Data Source
AI summary
A switch module for an electronic device detects translational inputs and defines at least portion of a conductive path from an input surface of the electronic device to a processing unit of the electronic device. The switch module may be a component of a crown assembly for detecting rotational inputs, translational inputs, touch inputs and/or biological signals such as electrocardiogram (ECG) signals. The switch module may include a conductive dome and a friction guard that is positioned between the conductive dome and the actuation member of the crown assembly. The conductive dome and/or the friction guard may define at least a portion of the conductive path from the input surface to the processing unit.