Keyboard Key Structure Dust-Proofing via Segmented Pedestal
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Solution Overview
Problem
Conventional keyboard devices suffer from dust accumulation, which interferes with key structure operation and shortens their lifespan due to premature aging of elastic elements, especially in environments with high dust concentrations.
Innovation Solution
The key structure incorporates a plunger structure with a dust-storage chamber and a guiding chamber, along with a bent vertical partition wall to divert dust, enhancing dust-proofing and maintaining the tactile feel by using thermoplastic materials like polyoxymethylene (POM).
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the conventional key structure is used, then the keyboard device can be manufactured with simple structure, but dust accumulates in the key structure causing interference and shortening lifespan
Solution Approach 1:
The key pedestal is segmented into multiple functional chambers: a guiding chamber for the plunger structure, a dust-storage chamber for collecting dust, and a contacting chamber for the membrane switch. The partition wall separates the guiding chamber from the dust-storage chamber, creating distinct functional zones that prevent dust from interfering with the key mechanism while maintaining structural integrity.
Solution Approach 2:
The bent partition wall acts as an intermediary structure between the guiding chamber and the dust-storage chamber. It redirects dust particles away from the plunger structure's movement path while allowing the keycap to depress normally. The partition wall's bent design creates a dust diversion path that protects the elastic element and membrane switch from dust contamination.
2Ease of operation
If the conventional key structure without dust storage chamber is used, then the device complexity is low, but dust enters the key structure and causes unsmooth operation
Solution Approach 1:
The key pedestal is segmented into multiple functional chambers: a guiding chamber for the plunger structure, a dust-storage chamber for collecting dust, and a contacting chamber for the membrane switch. The partition wall separates the guiding chamber from the dust-storage chamber, creating distinct functional zones that prevent dust from interfering with the key mechanism while maintaining structural integrity.
Solution Approach 2:
The dust-storage chamber converts the harmful dust particles into a contained element. Instead of allowing dust to scatter and interfere with the key mechanism, the chamber collects and traps dust particles that enter through the keycap's gaps. The bent partition wall directs dust into the storage chamber, transforming a harmful factor into a contained, harmless element that does not affect 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
This design significantly reduces dust entry into the keyboard, preventing premature aging of elastic elements and improving the operating feel, thereby extending the keyboard's lifespan.
Implementation Method 1
the keycap is returned to its original position in response to an elastic force of the elastic element 113
Data Source
AI summary
A keyboard device includes a membrane circuit board and a key structure over the membrane circuit board. The key structure includes a keycap, a plunger structure, a key pedestal and an elastic element. The plunger structure is arranged between the keycap and the elastic element. At least a portion of the keycap is disposed within a pedestal dust-storage chamber of the key pedestal. At least a portion of the plunger structure is disposed within a guiding chamber of the key pedestal. Due to the relative location between the keycap, the plunger structure and the key pedestal, the path of the dust to enter the guiding chamber is extended or blocked. Consequently, the dust-proof efficacy is enhanced.