Key Structure Assembly for Better Tactile Feel and Tolerance Control
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Solution Overview
Problem
The existing key structure in electronic devices, such as smartwatches and mobile phones, suffers from a poor hand pressing feeling due to accumulated tolerance errors in the assembly dimension chain, leading to management difficulties and increased costs during production.
Innovation Solution
The proposed key structure includes a mounting seat, a key component, a clamping holder, and a switch device, where the clamping holder is mounted on the mounting seat, and the switch device is mounted on the clamping holder, connected to a main board via a flexible printed circuit. This configuration reduces the assembly dimension chain, minimizing accumulated part errors and improving the hand feeling of the key component.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the traditional assembly dimension chain including key component, bar tube holder, housing, circuit board, and switch device is used, then the structure is complete and functional, but the accumulated tolerance leads to poor hand feeling of the key component
Solution Approach 1:
The patent merges the bar tube holder and circuit board into an integrated structure, reducing the number of separate components in the assembly dimension chain. This integration eliminates the interfaces between these components, thereby reducing accumulated tolerance and improving the hand feeling of the key component while maintaining structural completeness
Solution Approach 2:
The patent segments the assembly dimension chain by directly mounting the switch device on the housing, bypassing the traditional multi-component chain. This segmentation approach isolates and eliminates unnecessary intermediate components, reducing the overall chain length and accumulated tolerance
2Ease of manufacture
If the traditional assembly dimension chain with multiple parts is used, then all components are included, but the production process management becomes difficult and costs increase
Solution Approach 1:
The patent combines multiple components (bar tube holder and circuit board) into a single integrated structure, reducing the total number of parts that need to be managed during production. This merger simplifies production process management and reduces assembly complexity while maintaining all necessary functions
Solution Approach 2:
The integrated structure serves multiple functions simultaneously - it acts as both a mounting structure and a circuit carrier, eliminating the need for separate bar tube holder and circuit board components. This multi-functionality reduces the number of parts and simplifies production management
Data Source
AI summary
A key structure includes a housing, a mounting seat, a key component, a clamping holder, a switch device, and a flexible printed circuit, where the mounting seat is mounted on the housing, the clamping holder and the key component are both mounted on the mounting seat, and the switch device is mounted on the clamping holder. The mounting seat and the clamping holder are between the switch device and the key component.