SMD Switch Buffering Sheet for Touchpad Noise Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional touchpad modules generate unpleasant noise due to collisions between the switch element and the triggering part, and existing noise reduction methods using rubber elements or covers are insufficient.
Innovation Solution
A surface mount device (SMD) switch design featuring a pedestal, a buffering sheet, a metal dome, and a movable conductive part, where the buffering sheet alleviates the collision between the metal dome and the movable conducting part, reducing the click sound.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional switch element with metal dome and triggering part is used, then the touchpad module can detect pressing operations, but unpleasant noise is generated due to collision between components
Solution Approach 1:
A buffering sheet is introduced as an intermediary component between the metal dome and the movable conducting part. This buffering sheet absorbs the collision impact when the metal dome is pressed, preventing direct contact and noise generation between the rigid metal dome and conducting part, while still allowing the switching function to occur.
Solution Approach 2:
The buffering sheet is positioned in advance between the metal dome and the movable conducting part to provide cushioning before the collision occurs. This pre-positioned cushioning layer prevents the harmful collision noise from generating in the first place, rather than attempting to reduce noise after the collision.
2Object-generated harmful factors
If rubber elements or covers are added to reduce noise, then the click sound is partially alleviated, but the device complexity increases and noise reduction efficacy remains limited
Solution Approach 1:
The buffering sheet is integrated into the existing switch structure as a thin layer between the metal dome and the movable conducting part, rather than adding separate rubber elements or covers. This merging approach achieves noise reduction without significantly increasing device complexity or requiring additional components.
Solution Approach 2:
The buffering sheet is implemented as a thin flexible film or layer that can be positioned between the metal dome and conducting part. This thin film approach provides effective noise cushioning while maintaining a compact structure and avoiding the bulkiness of traditional rubber elements or covers.
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 SMD switch design significantly reduces noise, enhancing the comfort of operating the touchpad module by minimizing the collision between the metal dome and the movable conducting part.
Implementation Method 1
the metal dome is subjected to deformation. At the same time, the metal dome is contacted with both of the first conducting part and the second conducting part, and the electric connection between the first conducting part and the second conducting part is established
Implementation Method 2
the buffering sheet alleviates the collision between the metal dome and the movable conducting part, reducing the click sound
Data Source
AI summary
A surface mount device switch includes a pedestal, a metal dome, a buffering sheet and a movable conducting part. A pedestal contact part of the pedestal is electrically connected with a circuit board. The buffering sheet is located over an opening of the pedestal. The metal dome is located under the opening. The movable conducting part is located under the buffering sheet. A portion of the movable conducting part is inserted into the opening. Due to the buffering sheet, the collision between the metal dome and the movable conducting part is alleviated and the click sound is reduced. Consequently, the comfort of operating the touchpad module is enhanced. The present invention further provides a touchpad module and a computing device with the surface mount device switch.