Scissor Keyswitch Structure for Quiet Keyboard Membrane Routing
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Solution Overview
Problem
Traditional keyswitches in keyboards generate noise and vibration due to direct collisions between the scissor lifting structure and the membrane circuit board, and the membrane circuit board requires excessive hole areas for hook engagement, constraining routing space.
Innovation Solution
The keyswitch design incorporates a lifting device with a first and second support member that abut on the membrane circuit board, reducing impact noise by partially abutting on the board and increasing the support area, while minimizing the hole area on the membrane circuit board.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the connecting end portion of the scissor lifting structure is embedded into a hole of the membrane circuit board to be engaged with a hook of the board, then the lifting device can be connected to the board, but it causes excessive hole area problem that imposes unnecessary constraints on the routing space of the membrane circuit board
Solution Approach 1:
The patent extracts the engagement function from the membrane circuit board by introducing a separate support member that carries the hook structure. The support member is connected to the lifting device but engages with the board independently, removing the requirement for large holes in the membrane circuit board and thus preserving routing space.
Solution Approach 2:
The support member acts as an intermediary between the lifting device and the membrane circuit board. Instead of the lifting device directly engaging with the board through large holes, the support member mediates this connection, allowing smaller openings while maintaining structural integrity and routing flexibility.
2Ease of operation
If the scissor lifting structure directly collides with the board when the keyswitch is pressed, then the lifting device can provide lifting function, but it results in noise and shaft vibration that affects the user's tactile experience
Solution Approach 1:
The support member serves as a mediator between the lifting device and the membrane circuit board, absorbing and distributing impact forces. This intermediary structure prevents direct collision between the lifting device and the board, thereby reducing noise and vibration while maintaining the lifting function.
Solution Approach 2:
The support member with its hook structure and connection to the lifting device creates a cushioning effect before impact occurs. The structure is designed to absorb and distribute forces, providing beforehand cushioning that prevents harsh direct impacts and reduces noise and vibration during keyswitch operation.
Data Source
AI summary
A keyswitch includes a board, a cap located above the board, a membrane circuit board disposed on the board to make first and second engaging structures of the board protrude from first and second holes of the membrane circuit board respectively, and a lifting device. The lifting device is connected to the cap and the board and includes first and second support members. The first support member is movably connected to the cap and has a pivot end portion. The pivot end portion is movably connected to the first and second engaging structures and has a first abutting portion extending toward edges of the first and second holes along a pivot axis of the first engaging structure. The first abutting portion abuts on the membrane circuit board. The second support member rotatably intersects with the first support member and is movably connected to the cap and the board.