Keyswitch Magnetic Restoring Force and Stability
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Solution Overview
Problem
Conventional keyswitches face issues with unstable driving force and poor pressing feeling due to reduced space, which affects the operation stability and feedback provided to the user, especially when using magnetic attraction force for restoring the keycap.
Innovation Solution
A keyswitch design incorporating a magnetic attraction force and a force transmission part, where the keycap moves the movable part downward through the force transmission part to trigger the switch, providing a direct and stable reaction force to the user by eliminating intermediate components that can destabilize the force transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the keyswitch is reduced in volume (height decreased), then the compactness is improved, but the space for disposing the elastic rubber dome is reduced, causing the driving force to be limited and operation stability to deteriorate
Solution Approach 1:
The patent replaces the elastic rubber dome (mechanical elastic force) with a magnetic attraction force system. The magnetic force is generated between a fixed magnetic component on the base and a movable magnetic component on the movable part, providing the restoring force for the keycap without requiring large space for an elastic dome structure.
Solution Approach 2:
The patent changes the physical principle from elastic deformation to magnetic field interaction. By adjusting magnetic field strength and distribution, the system achieves stable driving force in a compact space, resolving the contradiction between reduced volume and maintained operation stability.
2Ease of operation
If the elastic rubber dome is used for providing pressing feeling, then the force feedback is provided, but the reduced space limits the driving force and makes the pressing feeling poor
Solution Approach 1:
The patent substitutes the elastic rubber dome with a magnetic attraction force system that can provide adequate driving force and pressing feeling in a compact design. The magnetic force directly acts on the movable part, ensuring stable force feedback to the user without requiring large internal space.
3Force
If the magnetic attraction force components are disposed on the lift mechanism, then the magnetic attraction force can be provided, but the reaction force transfer path passes through more components, making the reaction force unstable
Solution Approach 1:
The patent segments the magnetic force generation into two independent parts: a fixed magnetic component on the base and a movable magnetic component on the movable part. This segmentation allows the magnetic attraction force to act directly on the movable part without requiring the force to be transferred through the lift mechanism, thereby stabilizing the reaction force.
Solution Approach 2:
The patent introduces a direct magnetic field interaction as an intermediary force transmission mechanism between the base and the movable part, bypassing the mechanical lift mechanism for force transfer. This direct magnetic coupling provides a more stable reaction force path.
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 ensures a clear and stable pressing feeling by directly transferring the magnetic attraction force to the keycap, enhancing user feedback and operation stability by providing a clear peak of force feedback and displacement buffer.
Implementation Method 1
A magnetic attraction force due to a magnetic attraction effect between the first magnetic portion and the second magnetic portion is exerted on the movable part
Data Source
AI summary
A keyswitch uses a magnetic attraction force produced between and by a fixed part, fixedly disposed relative to a base, and a movable part, movably disposed relative to the base, as a driving force for returning a keycap to its original position. The movable part is between the fixed part and the base. The keyswitch also uses a force transmission part disposed between the keycap and the movable part as an intermediate for transferring force from the keycap to the movable part. When a force for pressing the keycap downward overcomes the magnetic attraction force, the movable part moves toward the base and then triggers a switch.