Humidity Sensor Dam Section Prevents Gel Adhesion
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Solution Overview
Problem
Existing humidity sensors face challenges in reducing the adhesion of protection gel to the humidity-sensitive film, which can affect detection accuracy, and their manufacturing processes are complex, leading to increased costs due to the need for additional parts and complicated processes.
Innovation Solution
A humidity sensor design that incorporates a dam section with a dam wire made from the same material as the detection electrodes and a dam humidity-sensitive film made from the same material as the humidity-sensitive film, forming a multilayer structure to prevent protection gel adhesion and simplify the manufacturing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a protection gel section is applied to the pad section, then corrosion protection is improved, but the protection gel may flow and adhere to the humidity-sensitive film, reducing detection accuracy
Solution Approach 1:
The pad section is divided into two distinct layers: a lower protection gel section for corrosion protection and an upper dam section made of humidity-sensitive film material that prevents gel flow onto the humidity-sensitive film. This segmentation allows each layer to perform its specific function without interfering with the other.
Solution Approach 2:
The dam section acts as an intermediary barrier between the protection gel section and the humidity-sensitive film. It restrains the flowable protection gel from adhering to the humidity-sensitive film while allowing the gel to remain in place for corrosion protection.
2Measurement precision
If a separate frame member is used to prevent gel adhesion, then detection accuracy is improved, but the number of parts increases and manufacturing becomes complicated
Solution Approach 1:
The dam section is formed from the same material as the humidity-sensitive film using the same manufacturing process, merging what would otherwise be separate components. This integration reduces the number of parts and simplifies the manufacturing process while maintaining the function of preventing gel adhesion.
Solution Approach 2:
The humidity-sensitive film material serves multiple functions: it forms the active sensing element for humidity detection and also creates the dam section that prevents protection gel adhesion. This multi-functionality eliminates the need for separate frame members or barriers.
3Ease of manufacture
If the dam section is made only from polyimide with the same formation conditions as the humidity-sensitive film, then manufacturing is simplified, but the dam section cannot be made extremely higher than the humidity-sensitive film, allowing gel to flow across
Solution Approach 1:
The formation conditions for the dam section are deliberately changed from the standard humidity-sensitive film formation conditions. By adjusting parameters such as drying temperature, drying time, or curing conditions, the dam section achieves greater height while still being formed from the same polyimide material in an integrated process.
Data Source
AI summary
A humidity sensor includes a humidity detention section, a pad section, and a dam section. The humidity detention section includes a pair of detection electrodes facing each other on a predetermined surface of a substrate and a humidity-sensitive film covering the detection electrodes. The pad section is spaced from the humidity detection section on the surface and covered with a protection gel section. The dam section is located between the humidity detection section and the pad section on the surface. The dam section includes a dam wire that is made from the same material as the detection electrodes and a dam humidity-sensitive film that is made from the same material as the humidity-sensitive film and covers at least part of the dam wire.