Push-Button Switch Movable Contact Alignment and Wear Reduction
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Solution Overview
Problem
Conventional push-button switch members face challenges in handling high loads while maintaining a small size, achieving long-term stable switching, and providing a high-click feeling due to issues like misalignment and adhesive-related dimensional tolerance, which affect durability and operation feeling.
Innovation Solution
A push-button switch member design featuring a dome-shaped movable contact with an upper contact portion and a non-contacting outer contact portion, where the operation key includes a dome portion and a foot portion fixed to the substrate, allowing for precise alignment and stable contact with multiple contacts on the substrate, reducing wear and maintaining low electric resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a rubber switch is disposed above the metal dome, then the problem of handling high load is reduced, but misalignment can easily occur between the pressor and the metal dome top portion
Solution Approach 1:
The patent extracts the adhesive layer from the bonding interface between the pressor and metal dome, replacing it with a direct mechanical connection. The pressor is positioned immediately below the key body and directly contacts the metal dome top portion, eliminating the adhesive layer that caused misalignment issues while maintaining the load-bearing capability provided by the rubber switch structure.
2Stability of the object's composition
If adhesive is present in the bonding region, then bonding is achieved, but the metal dome cannot be deformed easily and high-click feeling is reduced
Solution Approach 1:
The patent extracts the adhesive layer from the region between the pressor and metal dome, allowing the metal dome to be directly pressed by the pressor. This direct contact enables easy deformation of the metal dome during pressing operations, restoring the high-click feeling while bonding stability is maintained through the direct mechanical connection between the pressor and metal dome.
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 design enables high-load handling with a small size, ensuring long-term stable switching and a high-click feeling by minimizing misalignment and wear, while maintaining low electric resistance and reliable on/off functionality.
Implementation Method 1
a dome portion (32) connected to an outer periphery of the key body (31) and deformable by pressing on the key body (31) to a substrate side
Data Source
AI summary
A push-button switch member includes: a movable contact and an operation key disposed facing the protruding side thereof, and in contact therewith or spaced therefrom. The movable contact includes: an upper contact portion disposed directly under a key body; an outer fixed portion in the upper contact portion or more outward therefrom in the radial direction, and fixed more outward in the radial direction than the key body; and a non-contacting outer portion provided more outward in the radial direction than the upper contact portion, and disposed to face in a non-contacting state another contact so as to be able to contact another contact which is disposed on an outer side in the radial direction and contacted by the upper contact portion when pushed by the key body. The non-contacting outer portion has a bottom portion for a line contact or a surface contact with another contact.