Push Switch Intermediate Sheet for Click Feel
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Solution Overview
Problem
Conventional push switches experience blunted operational feeling due to the adhering of protecting sheets and adhesives, which inhibit the inverting operation of the movable contact, limiting the click feeling experience.
Innovation Solution
Incorporating an intermediate sheet with low affinity for the adhesive between the movable contact and the protecting sheet, reducing the adhesion strength and allowing for easier displacement during the inverting operation, thereby minimizing the impact of the protecting sheet and adhesive on the movable contact's deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If protecting sheet and adhesive are used to cover the movable contact, then protection and insulation are improved, but operational feeling and click feeling deteriorate due to blunting
Solution Approach 1:
The protecting sheet is divided into two distinct regions: a first region with strong adhesion that maintains protection and insulation, and a second region with weak adhesion that allows smooth inverting operation. This segmentation resolves the contradiction by providing different adhesion characteristics in different areas of the same component.
Solution Approach 2:
Different regions of the protecting sheet are given different adhesion qualities - the first region has high adhesion strength for protection while the second region has low adhesion strength for operational smoothness. This local differentiation allows the same protecting sheet to simultaneously provide both protection and ease of operation.
2Strength
If adhesive strength is increased to improve bonding, then attachment reliability is improved, but inverting operation becomes inhibited and click feeling is reduced
Solution Approach 1:
The adhesive properties are segmented into two zones: a first region with strong bonding capability and a second region with weak bonding capability. This allows the protecting sheet to maintain strong attachment where needed while providing smooth operation where required.
Solution Approach 2:
The protecting sheet exhibits local quality variation in adhesion strength, with the first region designed for strong bonding and the second region designed for easy separation during operation. This local differentiation resolves the contradiction between bonding strength and operational smoothness.
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 enhances the click feeling by allowing smoother inverting and returning operations of the movable contact, reducing blunting of the operational feeling and maintaining effectiveness across various temperatures.
Implementation Method 1
a protecting sheet (7) provided above the movable contact (5) so as to cover the concave portion, the protecting sheet having an adhesive formed on a lower surface thereof
Implementation Method 2
the central portion having the dome shape of movable contact 5 is elastically inverted so as to be convex downward with click feeling
Data Source
AI summary
A push switch of the present invention includes a case in which a concave portion is formed. The push switch of the present invention includes a movable member formed so as to be convex upward and arranged in the concave portion. The push switch of the present invention includes a protecting sheet provided above the movable member so as to cover the concave portion, the protecting sheet having an adhesive formed on a lower surface thereof. The push switch of the present invention is provided with an intermediate sheet between a lower surface of the adhesive and an upper surface of the movable member.