Button Assembly Insulating Sleeves Prevent Short Circuits
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Solution Overview
Problem
Wearable electronic devices with integrated ECG measurement functions often experience short circuits due to the metal button contacting the metal casing, leading to poor reliability and user experience.
Innovation Solution
A button assembly with a conductive button and insulating sleeves separates the button from the conductive casing, preventing short circuits and using lateral slits in the sleeves to ensure a tight fit and reduce shaking during operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a metal button is used in a metal casing for ECG measurement, then the device structure is simple and cost-effective, but the button may contact the casing causing short circuits and poor reliability
Solution Approach 1:
The patent introduces insulating sleeves as intermediary components between the conductive button and the conductive casing. These sleeves prevent direct contact between the button and casing, eliminating the short circuit risk while maintaining the metal button structure for ECG functionality. The insulating sleeves act as mediators that preserve both electrical conductivity where needed and electrical isolation where required.
Solution Approach 2:
The button assembly is segmented into multiple components: the conductive button, insulating sleeves, and retaining structures. This segmentation allows each component to perform its specific function - the button provides conductivity for ECG, while the insulating sleeves provide isolation from the casing. The segmentation resolves the contradiction by separating the conflicting requirements of conductivity and insulation into different spatial zones.
2Reliability
If the button is tightly fitted to prevent shaking, then operational reliability improves, but installation precision requirements increase
Solution Approach 1:
The insulating sleeves undergo parameter changes during installation - specifically, their inner diameters expand to match the outer diameter of the shaft part. This parameter change allows the sleeves to transition from a loose fit during installation to a tight fit during operation, achieving reliable button stability without requiring extremely precise manufacturing tolerances for the shaft hole and shaft part interface.
Data Source
AI summary
A button assembly is adapted to be installed at a conductive casing. Two opposite sides of the conductive casing respectively have first and second openings, and the first opening is communicated with the second opening. The button assembly includes a conductive button, a first insulating sleeve, and a second insulating sleeve. The conductive button includes a button part corresponding to the first opening and a shaft part connected to the button part and passing through the second opening from the first opening. The first insulating sleeve includes a first shaft hole and a first lateral slit. The second insulating sleeve includes a second shaft hole and a second lateral slit. The first insulating sleeve is sleeved on the shaft part and located at the first opening. The second insulating sleeve is sleeved on the shaft part and located at the second opening. An electronic device is also provided.