Push Switch Terminal Placement for Slim Profile and Mounting Strength
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Solution Overview
Problem
Conventional push switches face challenges in slimming down while maintaining mechanical strength, particularly in reducing height from the wiring board surface and satisfying mounting density requirements in downsized electronic devices.
Innovation Solution
The push switch design includes a case with surface-mounted terminals, a dome-shaped movable contact, and an operating body, where the terminals are led outward and soldered above the case's bottom surface, allowing for a lower profile and enhanced mechanical strength through strategic placement and structural modifications such as corner projecting sections and rest sections, which improve operational stability and reduce friction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the push switch is designed with terminals extending from the side of the case, then the height from the wiring board surface can be reduced, but the mechanical strength and stability of the mounting may be compromised
Solution Approach 1:
The terminals are led outward from the side section of the case rather than extending downward, changing the dimensional orientation of terminal extension. This allows the case to be positioned lower on the wiring board while maintaining terminal functionality, thus reducing the overall height of the push switch from the wiring board surface.
Solution Approach 2:
The case is divided into functional sections including a rest section that contacts the wiring board surface. This segmentation allows the lower surface position of the terminal to be above the bottom surface of the case, enabling the case to extend lower and reduce height while maintaining mounting stability through the rest section.
2Productivity
If the push switch is slimmed down to meet mounting density requirements, then mounting density increases, but the mechanical strength and operational stability may deteriorate
Solution Approach 1:
By leading terminals outward from the side of the case rather than extending them downward, the design reduces the vertical space required, allowing the push switch to be slimmer while maintaining terminal functionality and mounting reliability.
Solution Approach 2:
The rest section is specifically designed to contact the wiring board surface, providing localized stability and mechanical support. This localized quality enhancement ensures operational stability and mounting reliability even as the overall device is slimmed down to increase mounting density.
3Length of stationary object
If the terminal lower surface position is raised above the case bottom surface, then the height from wiring board surface is reduced, but the structural support for the terminal may be weakened
Solution Approach 1:
The case is segmented into a rest section that contacts the wiring board surface and an upper section housing the operating mechanism. This segmentation allows the terminal lower surface to be positioned above the case bottom surface while the rest section provides structural support and stability to the overall assembly.
Solution Approach 2:
The structural support function is shifted from vertical extension to horizontal/resting contact through the rest section. This dimensional change allows the terminal to be positioned higher relative to the case bottom while maintaining stability through the rest section's contact with the wiring board surface.
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
This design enables a push switch with reduced height from the wiring board surface while maintaining mechanical strength, improving operational feel and stability, and allowing for increased mounting density without compromising mechanical integrity.
Implementation Method 1
the dome-shaped portion of movable contact 4 is transformed into a bottom convex shape accompanied by a sense of click, and its lower surface comes into contact with central fixed contact 2
Implementation Method 2
by self-restoring force of movable contact 4, movable contact 4 is restored to the original dome shape rounded upward, accompanied by a sense of click, and the above-mentioned lower surface of the central section is separated from central fixed contact 2
Data Source
AI summary
A configuration of a push switch minimizes the extent to which the switch protrudes from a wiring board, and thereby allows for a device including the switch to have smaller dimensions. Minimizing the height by which the switch protrudes above the wiring board also minimizes the moment caused by the pressing the switch which is transferred to terminals soldered to the wiring board, and thus improves the mechanical strength of the attachment to the wiring board. The configuration includes, in part, a case having a terminal protruding therefrom, wherein a lower surface position of the terminal where soldering is performed is located above a bottom surface of the case.