Stretchable Circuit Board Adhesive Separator for Biosensor Accuracy
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing biosensors face challenges in uniformly applying conductive cream to electrodes, leading to issues like changes in wiring resistance and short circuits, especially when using high viscosity cream, which affects biosignal measurement accuracy.
Innovation Solution
A stretchable circuit board design featuring a stretchable base material with integrated stretchable wiring lines and electrodes, an adhesive layer formed in non-electrode regions, and a detachable adhesive layer separator with openings over the electrodes, allowing for precise application of conductive cream without adhering to unintended areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conductive cream is applied to enhance adhesiveness between electrodes and living body, then measurement accuracy is improved, but wiring resistance may change or short circuits may occur due to non-uniform application
Solution Approach 1:
The adhesive layer is segmented into electrode regions and non-electrode regions, with the conductive cream application area further segmented by the adhesive layer separator openings. This segmentation ensures conductive cream is applied only to specific electrode areas, preventing short circuits while maintaining measurement accuracy.
Solution Approach 2:
The adhesive layer separator acts as an intermediary component between the adhesive layer and the electrode region. Its openings provide controlled access for conductive cream application to electrodes while the separator itself prevents cream from reaching non-electrode areas, thus preventing wiring resistance changes and short circuits.
2Reliability
If adhesive layer covers entire surface for uniform bonding, then bonding reliability is improved, but conductive cream cannot be precisely applied to electrodes only
Solution Approach 1:
The adhesive layer is divided into electrode regions and non-electrode regions, with the adhesive layer separator further dividing the electrode regions through its openings. This allows the adhesive to cover the entire surface for reliable bonding while enabling precise conductive cream application only to the electrode areas through the separator openings.
Solution Approach 2:
The adhesive layer separator provides different properties to different areas: it allows conductive cream passage at electrode regions (through openings) while blocking it at non-electrode regions. This local differentiation enables precise cream application without compromising overall bonding reliability.
3Reliability
If adhesive layer is present in electrode region, then bonding is improved, but conductive cream application becomes difficult and may cause short circuits
Solution Approach 1:
The adhesive layer separator segments the electrode region into accessible areas (through openings) and protected areas (covered by separator). The adhesive layer remains present throughout for bonding, but the separator openings create safe zones where conductive cream can be applied without causing short circuits.
Solution Approach 2:
The adhesive layer separator serves as an intermediary that allows the adhesive layer to provide full-surface bonding while simultaneously creating controlled access points for conductive cream application. The separator mediates between the need for comprehensive bonding and the need for precise, safe cream application to prevent short circuits.
Data Source
AI summary
Provided is a stretchable circuit board including: a stretchable base material having stretchability and including a stretchable wiring line on one main surface; an electrode formed on at least the main surface of the stretchable base material and connected to the stretchable wiring line; an adhesive layer directly or indirectly bonded to the main surface on which the electrode is formed and formed in a region of the main surface other than an electrode region including the electrode; and an adhesive layer separator detachably bonded to the adhesive layer and having an opening formed at a position corresponding to at least part of the electrode region.