Translucent Capacitance Sensor Electrode Layout for Curved Surfaces
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Solution Overview
Problem
Capacitance sensors with adhesion-enhancing layers tend to lose flexibility when attached to curved surfaces due to increased thickness, necessitating a balance between adhesion and flexibility.
Innovation Solution
A capacitance sensor design featuring a resist layer on partial base film surfaces with higher adhesion to conductive polymer, allowing electrodes to be attached via the resist layer, and optionally including a shield layer to enhance adhesion and reduce electromagnetic interference while maintaining flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a layer that enhances adhesion is provided on the entire surface of the base film, then the adhesion between the electrode and base film is improved, but the thickness of the capacitance sensor increases and flexibility decreases
Solution Approach 1:
The patent applies the adhesion-enhancing resist layer only to specific regions where electrode attachment is required, rather than covering the entire base film surface. This localized application provides sufficient adhesion at electrode interfaces while preserving the overall flexibility of the capacitance sensor by leaving other areas thin and flexible.
Solution Approach 2:
The base film surface is divided into regions with resist layer and regions without resist layer. The resist layer is segmented to be present only where electrode adhesion is needed, allowing the sensor to have both high adhesion at critical interfaces and high flexibility in other areas.
2Reliability
If a layer that enhances adhesion is provided on the entire surface of the base film, then the adhesion between the electrode and base film is improved, but the attachability to curved surfaces deteriorates
Solution Approach 1:
The resist layer is applied locally only where electrode attachment is required rather than across the entire surface. This localized approach provides sufficient adhesion at electrode interfaces while maintaining the flexibility needed for attachment to curved surfaces, as the uncoated areas remain thin and conformable.
Solution Approach 2:
The surface is segmented into coated and uncoated regions, allowing the sensor to achieve both strong electrode adhesion where needed and the flexibility required for curved surface attachment in other regions.
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
The design maintains flexibility and improves adhesion to curved surfaces by using a resist layer with higher adhesion to conductive polymer, and optionally includes a shield layer to reduce electromagnetic interference.
Implementation Method 1
the resist layer having translucency and having higher adhesion to a predetermined conductive polymer than the base film
Data Source
AI summary
A capacitance sensor includes a translucent base film, a translucent resist layer disposed on a part of a main surface of the translucent base film and having higher adhesion to a conductive polymer than to the translucent base film, and a translucent electrode including a conductive material containing the conductive polymer and disposed on a surface of the translucent resist layer opposite to a surface of the translucent resist layer on which the translucent base film is disposed. When viewed along a thickness direction of the translucent base film, a region of the main surface of the translucent base film where the translucent resist layer is not disposed surrounds the translucent electrode.