Metal Button Sleeve Structure for Short-Circuit-Free Wearables
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Solution Overview
Problem
Smart wearable devices with metal buttons and shells face issues of short circuits due to direct contact and excessive spacing leading to button shaking and increased volume, affecting electrocardiogram measurements.
Innovation Solution
A heat shrinkable plastic sleeve is used to wrap the metal shaft of the button member, preventing direct contact with the metal shell and reducing the gap between the shaft and the shell, while maintaining a waterproof seal and smooth movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the distance between the metal button and the metal shell is increased to avoid contact, then short circuit is avoided, but the space between the button and shell becomes too large causing shaking of the button or increase of overall volume
Solution Approach 1:
An insulating sheet is introduced as an intermediary component between the metal button and the metal shell. This insulating sheet prevents direct contact between the two metal components, thereby avoiding short circuits, while maintaining a compact overall structure without excessive spacing that would cause button shaking or increase volume.
2Reliability
If the distance between the metal button and the metal shell is increased to avoid contact, then short circuit is avoided, but shaking of the button occurs due to excess space
Solution Approach 1:
The insulating sheet serves as a mediator that fills the space between the button and shell, preventing short circuits while providing structural support that stabilizes the button position and prevents shaking.
3Reliability
If a non-metallic insulating material is used between the button and shell, then short circuit is avoided, but the button movement may be restricted
Solution Approach 1:
The insulating sheet is designed with specific local properties: it provides electrical insulation where needed to prevent short circuits, while maintaining appropriate thickness and flexibility in the button contact area to allow smooth button movement and pressing operation.
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
Prevents short circuits and button shaking, ensuring accurate electrocardiogram measurements by isolating the metal components and reducing the space between the button and shell, while providing a waterproof seal.
Implementation Method 1
The sleeve member is made of a heat shrinkable plastic material, and the sleeve member wraps the shaft body tightly
Data Source
AI summary
An electronic device includes a shell, a button member, a sleeve member, a waterproof ring, and a circuit board. The shell is made of a metal material, and the shell includes a mounting hole. The button member is made of a metal material, the button member includes a cap and a shaft body, the cap is located on an outer side of the shell, the shaft body passes through the mounting hole, and the shaft body includes a first end and a second end. The sleeve member is made of a heat shrinkable plastic material, and the sleeve member wraps the shaft body tightly. The waterproof ring is sleeved on the shaft body. The circuit board is disposed inside the shell, and the second end of the shaft body is movably in contact with or away from the circuit board.