Sidecut Dome Push Switch for Low-Noise Click Feel
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Solution Overview
Problem
Existing push switches generate collision noise when the movable contact member collides with a fixed member during inversion operations, and reducing the inversion speed to minimize this noise can compromise the operational feeling for the user.
Innovation Solution
A push switch design featuring a dome-shaped movable contact member with a sidecut shape, where both sides of a circular shape form a pair of linear portions, and a sidecut ratio between 40% to 70%, which reduces the inversion speed and minimizes collision noise while maintaining a good operational feeling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the inversion speed of the movable contact member is reduced to minimize collision noise, then collision noise is reduced, but the operational feeling for the user deteriorates
Solution Approach 1:
The patent applies parameter changes by modifying the geometric parameters of the movable contact member. Specifically, it changes the sidecut ratio (B/A×100) to a specific range of 40% to 70%, and adjusts the dome height to diameter ratio to 0.15 to 0.35. These parameter optimizations allow the movable contact member to achieve lower inversion speed and reduced collision noise while maintaining good operational feeling, thus resolving the technical contradiction between noise reduction and ease of operation.
Solution Approach 2:
The patent utilizes spheroidality by employing a dome-shaped movable contact member with specific curvature characteristics. The dome shape with optimized height to diameter ratio (0.15 to 0.35) and sidecut ratio (40% to 70%) creates favorable stress distribution and deformation characteristics during inversion, enabling reduced inversion speed without compromising operational feedback, thereby resolving the contradiction between collision noise reduction and operational feeling.
2Object-affected harmful factors
If the sidecut ratio is optimized to reduce inversion speed, then collision noise is reduced, but the structural complexity increases
Solution Approach 1:
The patent resolves this contradiction through parameter optimization rather than structural complexity increase. By defining specific ranges for sidecut ratio (40% to 70%) and dome height to diameter ratio (0.15 to 0.35), the patent achieves noise reduction through quantitative parameter control. The sidecut shape itself remains a simple geometric modification of a circular form, avoiding complex structural designs while effectively controlling inversion dynamics to reduce collision noise.
Data Source
AI summary
A push switch includes a case having a recess with an open upper portion and a fixed contact inside the recess, a dome shaped movable contact member formed of a metal plate and accommodated inside the recess of the case, and an operation member configured to press the movable contact member, to cause an inversion operation of the movable contact member. The movable contact member has a sidecut shape having both sides of a circular shape forming a pair of linear portions in a top view, and a sidecut ratio represented by (B/A)×100 within a range of 40% to 70%, where A denotes a diameter of the circular shape, and B denotes a distance between the pair of linear portions.