Key Switch Center Alignment via Deformable Embossed Portion
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Solution Overview
Problem
Conventional key switch structures require a special positioning mechanism to align the key top with the center of the keyhole, increasing manufacturing costs and assembly time, and can result in a poor external appearance and key top catching issues.
Innovation Solution
A key switch structure with a key sheet featuring an embossed portion that guides the key top to the center of the keyhole through contact with the tip corner parts of the pressing protuberance, eliminating the need for a positioning mechanism by utilizing a circular arc-shaped embossed portion and wall portion to ensure uniform gap alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a positioning mechanism is provided to align the key top with the center of the keyhole, then the alignment precision is improved, but the device complexity and manufacturing cost increase
Solution Approach 1:
The key sheet serves itself as a positioning mechanism through the embossed portion. When the key top is pressed, the embossed portion deforms and automatically guides the key top to the center position of the keyhole, eliminating the need for external positioning mechanisms while achieving precise alignment.
Solution Approach 2:
The embossed portion changes its physical state from a raised structure to a deformed state under pressure. This parameter change allows the embossed portion to transition from a static feature to an active guiding mechanism that pushes the key top to the center position.
2Manufacturing precision
If a positioning mechanism is provided to align the key top with the center of the keyhole, then the alignment precision is improved, but the assembly time increases
Solution Approach 1:
The key sheet automatically positions the key top through the embossed portion during the pressing operation itself, eliminating the need for separate positioning or alignment steps in the assembly process.
Solution Approach 2:
The embossed portion is pre-formed on the key sheet before assembly. When the key top is pressed, this pre-formed structure immediately engages and guides the key top to the center position, eliminating the need for post-assembly positioning adjustments.
3Ease of manufacture
If the key top is not aligned with the center of the keyhole, then the manufacturing process is simpler, but the external appearance deteriorates and key top catching occurs
Solution Approach 1:
The key sheet automatically ensures uniform gap alignment through the embossed portion, achieving good external appearance without requiring complex positioning mechanisms or precise manufacturing tolerances.
Solution Approach 2:
The deformable embossed portion dynamically adjusts to guide the key top to the center position, ensuring uniform gaps around the keyhole perimeter and preventing key top catching, while maintaining manufacturing simplicity.
Data Source
AI summary
A key switch structure is provided with a key switch located in a position corresponding to a keyhole, a key top, and a key sheet disposed between the key switch and the key top. An embossed portion recessed inwardly relative to a case body is formed on the key sheet in a state where the key sheet is pressed down by a pressing protuberance of the key top not depressed, and tip corner parts of the pressing protuberance contact the formed embossed portion. Thus, the key top can be naturally positioned in the center position of the keyhole.