U-Shaped Balance Link for Keypswitch Stability
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Solution Overview
Problem
Conventional mechanical keyswitches face stability issues due to inadequate lift mechanisms, especially with longer keycaps, where a single lift mechanism cannot provide balanced resilient force, leading to slanting, and conventional balance links are limited in constraining movement stability and prone to dimensional inaccuracies from bending processes.
Innovation Solution
A keyswitch structure incorporating a U-shaped balance link with L-shaped ends that can be flexibly connected to the keycap and lift mechanism, allowing direct constraint and improved stability, and a limitation structure to control the lift mechanism's range, enhancing movement steadiness and precision through a plate material cutting process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single lift mechanism is used for longer keycaps, then the structure is simple, but the keycap cannot move stably and slants easily
Solution Approach 1:
The balance link serves as an intermediary component between the keycap and base plate, providing additional constraint and balance resilient force. It mediates the movement between the keycap and base plate, ensuring stable vertical motion without requiring multiple complex lift mechanisms.
Solution Approach 2:
The balance link functions as a counterbalancing mechanism, providing balance resilient force that counteracts the gravitational force on the keycap. This ensures the keycap returns to its initial position after pressing and maintains stable movement throughout its stroke.
2Stability of the object's composition
If multiple lift mechanisms are used for longer keycaps, then the resilient force is more balanced, but the device complexity increases
Solution Approach 1:
The balance link combines the functions of multiple lift mechanisms into a single integrated component. It provides balance resilient force and movement constraint simultaneously, achieving the stability effect of multiple mechanisms while maintaining simple structure.
Solution Approach 2:
The balance link performs multiple functions: it provides balance resilient force, constrains keycap movement, and ensures stable vertical motion. This multi-functionality replaces the need for multiple specialized components, reducing overall device complexity.
3Stability of the object's composition
If the middle portion of the balance link is made long to constrain the keycap, then the movement stability improves, but the dimensional precision deteriorates due to bending processes
Solution Approach 1:
The patent replaces the traditional bending process with a plate material cutting process. This substitution eliminates the dimensional inaccuracies inherent in bending, achieving precise control of the balance link's geometry and ensuring stable keycap movement with high manufacturing precision.
4Device complexity
If the balance link is disposed at a side portion of the keycap, then the structure is simple, but the constraint effectiveness is reduced
Solution Approach 1:
The balance link utilizes the vertical dimension by extending upward to contact the keycap at an optimal position. This dimensional arrangement allows the link to be disposed at a side portion while still achieving effective constraint, combining structural simplicity with constraint effectiveness.
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 U-shaped balance link and limitation structure improve keycap movement stability and precision, enabling steadier and more controlled up-and-down movement, while the plate material cutting process ensures better dimensional accuracy and miniaturization.
Implementation Method 1
The top of the L-shaped end rotatably contacts against the keycap; the bottom of the L-shaped end rotatably contacts against the lift mechanism
Implementation Method 2
When keycap is pressed down, the lift mechanism is pressed down directly by the L-shaped ends
Implementation Method 3
The middle portion is rotatably disposed on the engagement structure
Implementation Method 4
the balance link can constrain the up-and-down movement of the keycap to improve the movement stability
Data Source
AI summary
A keyswitch structure includes a base plate, a keycap, a lift mechanism, and a balance link. The lift mechanism connects between the keycap and the base plate such that the keycap can move up and down relative to the base plate. The balance link is formed substantially in a U-shaped profile. The middle portion thereof is rotatably disposed on the base plate; the two ends thereof are respectively formed in an L-shaped profile and rotatably inserted into two slot structures on the keycap or the lift mechanism or both. Compared with a conventional balance link formed in an n-shaped profile connecting a keycap and a base plate, the invention provides more diverse structural connections, conducive to structural miniaturization. Furthermore, a support of the lift mechanism includes a protrusion capable of being blocked by a limitation structure disposed on the base plate for controlling the rotation angle of the support.