SMD Switch Conductive Buffering Sheet Noise Reduction
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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
Incorporating a surface mount device (SMD) switch with a metal dome and a conductive buffering sheet between the pedestal and the metal dome, which absorbs the deformation and prevents direct contact with the conducting parts, thereby reducing noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional switch element with metal dome is used in the touchpad module, then the switching function is achieved, but collision noise is generated between the metal dome and conducting parts
Solution Approach 1:
A rubber buffer is introduced as an intermediary component between the metal dome and the conducting parts. The rubber buffer absorbs the collision impact when the metal dome is pressed, preventing direct contact and noise generation between the metal dome and conducting parts, while still allowing the switching function to occur through the rubber buffer's deformation and contact.
Solution Approach 2:
The rubber buffer is pre-installed between the metal dome and the conducting parts to provide cushioning before any collision occurs. This beforehand cushioning prevents the harmful collision noise by absorbing the impact energy of the metal dome during pressing operations.
2Object-generated harmful factors
If rubber elements or covers are added to reduce noise, then the click sound is reduced, but the device complexity increases
Solution Approach 1:
The rubber buffer is merged with the existing switch element structure, combining the noise reduction function with the switching mechanism. This integration approach reduces device complexity compared to adding separate rubber covers or elements, as the buffer becomes an inherent part of the switch assembly.
Solution Approach 2:
A thin rubber buffer film is used instead of bulky rubber elements or covers. This flexible thin film effectively reduces click sound while occupying minimal space and adding little to the overall structural complexity of the device.
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 use of a conductive buffering sheet between the metal dome and the pedestal in the SMD switch module significantly reduces the click sound, enhancing the comfort of operation by minimizing noise during use.
Implementation Method 1
When the metal dome is subjected to deformation, the metal dome does not collide with the conducting part of the pedestal to generate the click sound
Implementation Method 2
a conductive buffering sheet between the pedestal and the metal dome, which absorbs the deformation and prevents direct contact with the conducting parts
Data Source
AI summary
A surface mount device switch includes a pedestal, a metal dome and a conductive buffering sheet. A pedestal contact part of the pedestal is electrically connected with a circuit board. The conductive buffering sheet is arranged between the pedestal and the metal dome. Due to the conductive buffering sheet, the metal dome does not collide with the conducting part of the pedestal to generate the click sound. 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.