Push Switch Vibration Damping via Composite Sheet Design
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Solution Overview
Problem
Conventional push switches often produce operational sounds due to vibrations during their operation, which can be undesirable in various applications.
Innovation Solution
The integration of a second sheet that is joined to the intermediate portion of the first sheet, acting as a vibration damping member, suppresses the vibration of the first sheet, thereby reducing the operational sound produced.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a protective sheet is added to cover the recess, then the switch contact portion is protected, but operational sound increases due to sheet vibration
Solution Approach 1:
The patent applies composite materials by combining the first sheet (protective layer) with a second sheet (vibration damping layer) having different material properties. The first sheet provides protection while the second sheet with higher damping capacity suppresses vibrations, creating a composite structure that simultaneously achieves protection and noise reduction.
Solution Approach 2:
The patent applies local quality by making the second sheet's physical properties (thickness, material composition) differ from the first sheet specifically in the regions where vibration occurs. The intermediate portion of the first sheet has different characteristics than the pressing portion, allowing localized vibration control without compromising overall protection.
2Object-generated harmful factors
If the first sheet is made thicker to reduce vibration, then operational sound decreases, but the snap feeling deteriorates
Solution Approach 1:
The patent segments the protective sheet into two separate sheets with different functions: the first sheet maintains the snap feeling with optimized thickness for operational feedback, while the second sheet provides vibration damping. This segmentation allows each sheet to be independently optimized for its specific function without compromise.
Solution Approach 2:
The second sheet acts as an intermediary between the first sheet and the external environment, absorbing vibrations before they propagate to generate sound, while allowing the first sheet to maintain its original thickness and snap feeling characteristics for optimal user feedback.
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 configuration effectively minimizes the operational sound generated during the push switch's operation while maintaining the intended operation touch and snap feeling.
Implementation Method 1
a second sheet joined to the first sheet... acting as a vibration damping member, suppresses the vibration of the first sheet
Implementation Method 2
a movable member disposed in the recess and including a pressure-receiving portion... contact portion which switches between ON and OFF by deformation of the movable member
Data Source
AI summary
A push switch according to the present disclosure includes: a case including a recess and having an upper surface located around the recess; a movable member disposed in the recess and including a pressure-receiving portion; a contact portion which switches between ON and OFF by deformation of the movable member; a first sheet including a joining portion which is opposite to the upper surface of the case, a pressing portion located above the pressure-receiving portion, and an intermediate portion located between the joining portion and the pressing portion, the first sheet covering the recess at the pressing portion and the intermediate portion; and a second sheet joined to the first sheet. The joining portion of the first sheet is joined to the upper surface of the case, and the second sheet is joined to the intermediate portion of the first sheet.