Waterproof Electronic Device Conductive Key Structure
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Solution Overview
Problem
Existing electronic devices face challenges in achieving effective waterproofing, particularly with movable exterior members like volume control keys and power keys, which can compromise the integrity of the printed circuit board due to gaps between moving parts and the case frame, allowing moisture ingress.
Innovation Solution
A waterproof structure is implemented in electronic devices, featuring a conductive sidewall that surrounds the space between the front and back covers, with a non-conductive structure and conductive connecting members to create hermetically sealed spaces, eliminating the need for additional waterproofing components and enhancing assembly efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If movable exterior members (keys) are used on the side surface, then ease of operation is improved, but waterproofing performance deteriorates due to gaps between moving members and case frame
Solution Approach 1:
The conductive connecting member is nested within the non-conductive structure, which is in turn nested within the case frame. This multi-level nesting creates a hermetic seal that prevents moisture ingress while accommodating the movable key, resolving the contradiction between operational ease and waterproofing performance.
Solution Approach 2:
The non-conductive structure acts as an intermediary between the case frame and the movable key, providing a hermetic seal. The conductive connecting member serves as another intermediary to establish electrical connection through the non-conductive barrier, enabling both waterproofing and electrical functionality simultaneously.
2Reliability
If additional waterproofing components are added to seal gaps, then waterproofing performance is improved, but device complexity increases
Solution Approach 1:
The waterproofing function and electrical connection function are merged into a single integrated structure. The conductive connecting member both seals the gap (waterproofing) and conducts electrical signals, eliminating the need for separate waterproofing components and reducing overall device complexity.
Solution Approach 2:
The conductive connecting member performs multiple functions simultaneously: it provides hermetic sealing against moisture, establishes electrical connection between components, and maintains structural integrity. This multi-functionality reduces the number of separate components needed, simplifying the overall device design.
3Reliability
If hermetically sealed spaces are created to protect internal components, then waterproofing performance is improved, but manufacturing complexity increases
Solution Approach 1:
The non-conductive structure and conductive connecting member are prepared in advance as pre-fabricated components with precise geometries. This preliminary preparation allows for simplified assembly processes, where components are simply fitted together to create the hermetic seal, reducing manufacturing complexity despite the sophisticated sealing function.
Data Source
Figure 1A
Figure 1B
Figure 1C
AI summary
An electronic device including a front cover, a back cover, and a sidewall configured to surround at least a part of an internal space formed between the front and back covers. Disposed in the space is a rear case including a first conductive connecting member formed therein; a first space formed between the back cover and the rear case; and a second space formed between the front cover and the rear case, the second space configured to be hermetically sealed from the first space. An electrical connecting member includes a first part disposed in the first space, a second part that extends to a surface of a non-conductive structure, and a third part electrically contacting the first conductive connecting member. A printed circuit board disposed within the second space is electrically connected with the first conductive connecting member. The sidewall may comprise an opening configured to receive a side key.