Push Switch Dome Contact Protrusion Click Consistency
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Solution Overview
Problem
Conventional push switches face challenges in maintaining a consistent click feeling due to size reduction and displacement issues during mounting on electronic devices, leading to variations in switch feel and operation distance.
Innovation Solution
A push switch design featuring a dome-shaped metallic movable contact with a protrusion above its center, allowing for elastic reversal and maintaining electrical conductivity between fixed contacts, even when displaced, providing a stable and light click feeling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the push switch is reduced in size and thickness, then it can be used in small and thin electronic apparatuses, but the click feeling becomes inconsistent and varies between devices
Solution Approach 1:
The patent changes the geometric parameters of the movable contact, specifically introducing a protrusion that extends from the center toward the opening. This protrusion modifies the elastic reversal characteristics of the dome-shaped contact, enabling consistent click feeling even in reduced-size switches. The protrusion height and position are optimized to maintain reliable elastic reversal behavior despite the smaller overall dimensions.
2Ease of operation
If the pressing force is increased to improve click feeling, then the switch operation becomes less easy, but if pressing force is reduced, the click feeling becomes weak
Solution Approach 1:
The patent applies local quality by concentrating the elastic reversal function in the protrusion region rather than relying on the entire dome-shaped contact. The protrusion is positioned and dimensioned to create a localized elastic reversal point that provides strong click feedback with minimal pressing force. This localized approach allows the main body of the movable contact to remain lightweight and easy to actuate.
3Ease of operation
If the operation distance is increased to improve stroke feeling, then the switch size increases, but if operation distance is reduced, the stroke feeling becomes less pronounced
Solution Approach 1:
The patent utilizes the curved, dome-shaped geometry of the movable contact in combination with the protrusion to achieve effective elastic reversal over a short distance. The spherical cap shape of the dome provides progressive elastic deformation that builds up stroke feeling, while the protrusion ensures reliable reversal point. This curved geometry allows pronounced stroke feeling within a compact vertical space.
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 ensures a consistent and stable click feeling, reduces variation in switch feel across different devices, and increases the operation distance for a more pronounced stroke feeling, making it suitable for small and thin electronic apparatuses.
Implementation Method 1
the center of the dome shape of movable contact 4 is elastically reversed in a downward-convex form with a click feeling
Implementation Method 2
the center of the dome shape of movable contact 4 elastically returns to its original upward-convex shape with a click feeling by elasticity of movable contact 4 itself
Data Source
AI summary
A push switch includes a first fixed contact and a second fixed contact disposed apart from the first fixed contact. Furthermore, the push switch includes a dome-shaped metallic movable contact facing the first fixed contact with a space therebetween, and a protrusion disposed above a center of the movable contact. When the protrusion is pressed, the movable contact is elastically reversed, and the first fixed contact and the second fixed contact become electrically conductive with each other via the movable contact.