Key Device Resilient Tongue Support Rod Noise Reduction
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Solution Overview
Problem
Conventional key devices in computer keyboards produce noise due to vibrations, touch actions, or press actions as the lower end of the support rod frequently bumps against the edge of the positioning seat's through hole.
Innovation Solution
Incorporating a resilient tongue on the circuit unit that extends beneath and abuts against the lower end of the support rod, pushing it upward to eliminate the gap between the rod and the edge of the positioning seat, thereby preventing noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the support rod is allowed to move freely through the through hole, then the key device can operate smoothly with minimal resistance, but noise is generated when the lower end of the support rod bumps against the edge of the through hole during vibrations or key presses
Solution Approach 1:
A resilient tongue is introduced as an intermediary component between the support rod and the through hole edge. The resilient tongue abuts against the lower end of the support rod and pushes it upward to contact the edge of the through hole, preventing direct impact noise while allowing the support rod to move freely during normal operation.
Solution Approach 2:
The resilient tongue applies a preliminary upward force on the support rod to pre-position it against the through hole edge. This preliminary action prevents the support rod from bumping against the edge during vibrations or key presses, eliminating noise before it can occur.
2Duration of action of moving object
If a gap exists between the lower end of the support rod and the edge of the through hole, then the support rod can move freely, but the gap causes the rod to bump against the edge during vibrations or key presses
Solution Approach 1:
The resilient tongue serves as a mediator that fills the functional gap between the support rod and the through hole edge. It maintains continuous contact with the support rod, pushing it upward to eliminate the gap and prevent bumping noise while preserving movement freedom.
Solution Approach 2:
The resilient tongue changes the positional parameter of the support rod by pushing it upward. This parameter change eliminates the gap between the support rod and the through hole edge, preventing noise while maintaining the ability of the support rod to move during key presses.
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 resilient tongue ensures the support rod abuts against the positioning seat edge, reducing noise from vibrations and movements by eliminating the gap between the rod and the seat.
Implementation Method 1
a resilient tongue provided on one layer of the multi-layered structure... The free end of the resilient tongue extends beneath and abuts against the lower end of the support rod, and pushes upwardly the lower end of the support rod
Data Source
AI summary
A key device includes a plate body, a positioning seat having a through hole, a circuit unit mounted on the plate body, a keycap disposed above the circuit unit, and an elastic member disposed between the circuit unit and the keycap. The circuit unit includes a multi-layered structure, and a resilient tongue provided on one layer of the multi-layered structure and having a free end proximate to the through hole. A support rod is connected to and supports the keycap on the substrate, and has a lower end extending through the through hole. The free end of the resilient tongue extends beneath and abuts against the lower end of the support rod, and pushes upwardly the lower end of the support rod to abut against an edge confining the through hole.