Capacitive Key Structure for Faster Response and Fewer False Triggers
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Solution Overview
Problem
Membrane and mechanical keyboards suffer from slow response times and loss of physical contact, leading to reduced operating sensitivity and increased false triggering.
Innovation Solution
A key structure incorporating a first electrode, a key cap with a conductive layer, and a restoration member with a second electrode, which generates a sensing signal through relative movement, enhancing sensitivity and reducing false triggering without the need for additional conductive members.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If membrane keyboard or mechanical keyboard is used, then physical contact is achieved, but response time is slow and operating sensitivity is reduced
Solution Approach 1:
The patent replaces traditional mechanical switch structures with a capacitive sensing system. The key cap with conductive layer forms a capacitor with the first electrode, detecting key presses through capacitance changes rather than mechanical contact. This eliminates mechanical wear and slow response times while maintaining operational sensitivity.
Solution Approach 2:
The patent changes the detection parameter from mechanical contact force to electrical capacitance. By monitoring capacitance changes between the first electrode and the key cap's conductive layer, the system achieves faster response times and improved operating sensitivity compared to traditional mechanical detection methods.
2Reliability
If traditional keyboard structures are used, then physical contact triggering is achieved, but false triggering possibility increases
Solution Approach 1:
The patent extracts the second electrode function from separate components and integrates it directly into the key cap structure. The key cap itself becomes the second electrode through its conductive layer, eliminating the need for additional conductive members and reducing false triggering possibilities.
Solution Approach 2:
The key cap serves multiple functions: it provides the user interface for pressing, forms part of the capacitive sensing structure as the second electrode, and eliminates the need for separate conductive members. This multi-functionality reduces device complexity while improving reliability.
3Ease of operation
If additional conductive members are added to enhance sensitivity, then operating sensitivity improves, but device complexity increases
Solution Approach 1:
The patent merges the key cap structure with the second electrode function. The conductive layer on the key cap serves as the second electrode, combining structural and sensing functions into a single component. This eliminates additional conductive members while maintaining high operating sensitivity.
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
The design improves operating sensitivity and reduces false triggering while simplifying the mechanism by utilizing conductive materials in the key cap, elastic member, and connection assembly to sense capacitance changes, thereby enhancing user experience.
Implementation Method 1
the second electrode generates a sensing signal by the key cap or the restoration member moving relative to the first electrode
Data Source
AI summary
A key structure including a first electrode, a key cap, and a restoration member is provided. The key cap is disposed on the first electrode. The restoration member is disposed between the key cap and the first electrode. The key cap or the restoration member has a second electrode. A sensing signal is generated by the second electrode with the key cap or the restoration member moving relative to the first electrode.