Switch Spacer Raised Portion Offset Adhesive Sag
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Solution Overview
Problem
Existing switches with thin electrode sheets and adhesive spacers face issues with sagging adhesives causing unintended contact and switch activation due to reduced rigidity, leading to recessed contact points.
Innovation Solution
The switch design incorporates a first and second electrode sheet with spacers and base portions to offset adhesive sag, ensuring the contact points remain intact by raising the spacers and base portions to match the adhesive thickness, thereby preventing recesses and maintaining switch integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the electrode sheet is thinned to reduce switch thickness, then the switch becomes thinner, but the rigidity of the electrode sheet is lowered causing the contact point to recess and potentially causing unintended switch activation
Solution Approach 1:
The spacer is pre-formed with a raised portion at the contact point location before assembly. This raised portion compensates for the adhesive sag that will occur during bonding, ensuring the electrode sheet remains at the correct height and prevents recess even when the electrode sheet is thinned for reduced switch thickness
Solution Approach 2:
The raised portion of the spacer creates a preliminary counteracting force against the adhesive sag. By having the spacer already elevated at the contact point, it prevents the electrode sheet from following the adhesive's downward sag, thereby maintaining contact point integrity and preventing unintended activation
2Strength
If adhesive is applied around the spacer opening to attach electrode sheets, then the electrode sheets are securely bonded, but the adhesive sags at the edge portions causing contact point recess
Solution Approach 1:
The raised portion of the spacer acts as an intermediary element between the adhesive and the electrode sheet. It mediates the interaction by providing a physical barrier that prevents the electrode sheet from following the adhesive's sag, thereby maintaining precise contact point positioning while still allowing strong bonding
Solution Approach 2:
The spacer's raised portion is prepared in advance to counteract the adhesive sag. This preliminary structural feature ensures that even when adhesive sags during bonding, the contact point position remains accurate because the spacer has already established the correct height reference
Data Source
AI summary
A switch includes: a first electrode sheet including a first electrode; a second electrode sheet including a second electrode that faces the first electrode sheet; and an adhesive that includes a first opening through which the first electrode faces the second electrode sheet and that attaches the first electrode sheet to the second electrode sheet. The first electrode sheet includes: a first substrate on which the first electrode is disposed; a first spacer between the first substrate and the second electrode sheet that includes a second opening at a position corresponding to the first electrode; and a first base between the first substrate and the first spacer that overlaps at least a portion of an edge of the first opening of the adhesive. The first spacer is attached to the second electrode sheet by the adhesive.