Electronic Crown Switch Module With Conductive Dome Input Separation
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Solution Overview
Problem
Electronic devices, particularly electronic watches, face challenges in effectively detecting and transmitting both rotational and translational inputs, such as those from a crown assembly, while preventing signal interference between different components.
Innovation Solution
A switch module is introduced that includes a conductive dome and a friction guard, which provide a conductive path between the input surface and the processing unit, allowing for the detection and transmission of inputs. The conductive dome collapses in response to translational inputs, and the friction guard maintains an outward biasing force to keep the actuation member in an unactuated position, ensuring reliable signal registration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a crown assembly is used to detect rotational and translational inputs, then user interaction capability is improved, but signal interference between different input types occurs
Solution Approach 1:
The crown assembly is divided into functionally independent components: a rotational input mechanism and a translational input mechanism. Each mechanism has its own sensing elements and signal transmission path, preventing signal interference while maintaining versatile input detection capability.
Solution Approach 2:
The patent introduces intermediary components including a friction guard positioned between the actuation member and conductive dome, and a dedicated switch module with separate electrical contacts. These intermediaries isolate and route signals from rotational and translational inputs through distinct pathways to the processing unit, eliminating cross-interference.
2Reliability
If a conductive dome is used to maintain conductive path, then signal transmission reliability is improved, but the structure becomes more complex
Solution Approach 1:
The patent combines multiple functions into the switch module: the conductive dome serves both as a translational input actuator and as a component that maintains the conductive path to the processing unit. The friction guard simultaneously provides mechanical guidance and electrical isolation. This integration reduces overall system complexity despite the added reliability features.
3Measurement precision
If friction guard is used to maintain unactuated position, then input detection accuracy is improved, but manufacturing complexity increases
Solution Approach 1:
The friction guard is designed to automatically maintain the actuation member in its unactuated position through frictional contact, without requiring additional springs, magnets, or active control mechanisms. This self-biasing feature simplifies manufacturing while ensuring precise detection of translational inputs when they occur.
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 efficient detection and transmission of both rotational and translational inputs, reducing signal interference and maintaining a conductive path regardless of the actuation member's position, thereby enhancing the responsiveness of electronic devices to user inputs.
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
The friction guard maintains an outward biasing force to keep the actuation member in an unactuated position
Implementation Method 3
The switch module enables efficient detection and transmission of both rotational and translational inputs, reducing signal interference and maintaining a conductive path
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.