Elongated Key Switch Reinforcement with Wire Members
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Solution Overview
Problem
Keycaps in notebook personal computers, especially those with horizontally elongated shapes like the Spacebar or Shift keys, face strength issues due to thinning, leading to poor operational feeling and reduced rigidity, as existing reinforcement methods either compromise on width or result in fragile engagement parts.
Innovation Solution
A key switch unit design featuring a keycap with a reinforcement mechanism comprising three wire members bent into angular C-letter shapes, each extending along the length of the keycap, engaging the lower surface to enhance strength without compromising width, and turning on a supporting plate to maintain horizontal movement during pressing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the keycap is thinned to reduce vertical dimension, then the keycap size is reduced, but the keycap strength and rigidity are significantly reduced
Solution Approach 1:
The patent combines the resin keycap material with metal wire members to create a composite reinforcement structure. The wire members are embedded within or attached to the keycap to provide additional strength without increasing the overall thickness, resolving the contradiction between thinning and strength maintenance.
Solution Approach 2:
The reinforcement is achieved by dividing the strengthening function into separate wire member components rather than thickening the entire keycap. Multiple wire members are strategically positioned at different locations to provide distributed reinforcement, allowing the keycap to remain thin while gaining strength through segmented reinforcement elements.
2Device complexity
If a single wire member is used to reinforce the keycap, then the device complexity is reduced, but only one side of the keycap is reinforced leading to uneven strength distribution
Solution Approach 1:
Different regions of the keycap receive reinforcement according to their specific strength requirements. Wire members are positioned at locations where strength is most needed, such as near the pressing region and at the ends of the elongated keycap, creating non-uniform local reinforcement that matches the stress distribution pattern.
Solution Approach 2:
Multiple wire members are combined in a coordinated arrangement to achieve comprehensive reinforcement. The wire members work together as an integrated reinforcement system, with their collective effect providing uniform strength distribution across the entire keycap structure.
3Volume of moving object
If the keycap is made thinner to reduce size, then the notebook computer can be made smaller and thinner, but the keycap becomes prone to tilting and bending when pressed
Solution Approach 1:
The wire members are pre-installed and fixed to the keycap before use, providing reinforcement in advance. This preliminary reinforcement ensures that when the keycap is pressed, the wire members are already in position to prevent tilting and bending, maintaining operational reliability despite the reduced thickness.
Solution Approach 2:
Instead of increasing thickness in the vertical dimension to prevent tilting, the patent uses wire members that extend in horizontal dimensions to provide rotational stability. The wire members act as structural elements that resist bending moments and prevent the keycap from tilting circumferentially on the rubber actuator.
Data Source
AI summary
A key switch unit includes a keycap elongated in a lengthwise direction; a switch mechanism; a supporting plate supporting the switch mechanism; and a key reinforcement mechanism engaging the keycap on its lower side for reinforcement. The key reinforcement mechanism includes a first wire member having a beam part extending over substantially an overall dimension of the keycap in the lengthwise direction; a second wire member having a beam part extending in the lengthwise direction between a region contacting the switch mechanism and a first lengthwise end of the keycap; and a third wire member having a beam part extending in the lengthwise direction between the region and a second lengthwise end of the keycap. The beam parts engage the keycap on its lower side. The first, second, and third wire members have respective end parts turnably supported on the supporting plate.